Extracting prog: 5m35.644954755s
Minimizing prog: 1h1m38.368916135s
Simplifying prog options: 9m48.140037338s
Extracting C: 5m18.690192918s
Simplifying C: 0s
extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 6m0s
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-openat-mmap
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='my_sys\x00', &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
failed to symbolize report: failed to start scripts/get_maintainer.pl [scripts/get_maintainer.pl --git-min-percent=15 -f fs/jbd2/transaction.c]: fork/exec scripts/get_maintainer.pl: no such file or directory
program crashed: INFO: task hung in do_get_write_access
single: successfully extracted reproducer
found reproducer with 5 syscalls
minimizing guilty program
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-openat
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='my_sys\x00', &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-mmap
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='my_sys\x00', &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, 0xffffffffffffffff, 0x0)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-openat-mmap
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mount-openat-mmap
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mount(0x0, &(0x7f0000000200)='my_sys\x00', &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-openat-mmap
detailed listing:
executing program 0:
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='my_sys\x00', &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-openat-mmap
detailed listing:
executing program 0:
getrandom(0x0, 0x0, 0x3)
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='my_sys\x00', &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-openat-mmap
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mkdir(0x0, 0x1ff)
mount(0x0, &(0x7f0000000200)='my_sys\x00', &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-openat-mmap
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
mount(0x0, 0x0, &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-openat-mmap
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='my_sys\x00', 0x0, 0x400, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-openat-mmap
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='my_sys\x00', &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
r0 = openat(0xffffffffffffff9c, 0x0, 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
program did not crash
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-openat-mmap
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
simplifying guilty program options
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-openat-mmap
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='my_sys\x00', &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-openat-mmap
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='my_sys\x00', &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
program crashed: INFO: task hung in jbd2_journal_commit_transaction
a never seen crash title: INFO: task hung in jbd2_journal_commit_transaction, ignore
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-openat-mmap
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='my_sys\x00', &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
program crashed: INFO: task hung in do_get_write_access
validation run: crashed=true
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-openat-mmap
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='my_sys\x00', &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
program crashed: INFO: task hung in jbd2_journal_commit_transaction
validation run: crashed=true
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): getrandom-mkdir-mount-openat-mmap
detailed listing:
executing program 0:
getrandom(&(0x7f0000000580)=""/265, 0xffffff3f, 0x3)
mkdir(&(0x7f0000000000)='my_sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='my_sys\x00', &(0x7f0000000300)='sysfs\x00', 0x400, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='my_sys/bus/pci/devices/0000:00:03.0/resource1\x00', 0x2, 0x0)
mmap(&(0x7f0000800000)=nil, 0x1000, 0x3, 0x11, r0, 0x0)
program crashed: INFO: task hung in do_get_write_access
validation run: crashed=true
reproducing took 1h33m28.913532444s
repro crashed as (corrupted=false):
INFO: task syz.0.27:6039 blocked in I/O w[ 370.654657][ T39] INFO: task syz.0.27:6039 blocked in I/O wait for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.27 state:D stack:24840 pid:6039 tgid:6039 ppid:5771 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x1709/0x5530 kernel/sched/core.c:7231
__schedule_loop kernel/sched/core.c:7308 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7323
io_schedule+0x7f/0xd0 kernel/sched/core.c:8151
bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
__wait_on_bit+0xac/0x2f0 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x670/0x1090 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x1c3/0x590 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6427
__ext4_mark_inode_dirty+0x13e/0x700 fs/ext4/inode.c:6602
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6639
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2709
generic_update_time fs/inode.c:2254 [inline]
file_update_time_flags+0x3f4/0x4b0 fs/inode.c:2484
ext4_page_mkwrite+0x225/0x1150 fs/ext4/inode.c:6805
do_page_mkwrite+0x14a/0x310 mm/memory.c:3761
do_shared_fault mm/memory.c:6021 [inline]
do_fault mm/memory.c:6083 [inline]
do_pte_missing+0x734/0x28f0 mm/memory.c:4645
handle_pte_fault mm/memory.c:6503 [inline]
__handle_mm_fault mm/memory.c:6652 [inline]
handle_mm_fault+0xf95/0x28d0 mm/memory.c:6821
do_user_addr_fault+0xa4d/0x1340 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f73b91f67f1
RSP: 002b:00007fff2d70f500 EFLAGS: 00010202
RAX: 0000001b2d364000 RBX: 0000000000000000 RCX: 000000000003fde8
RDX: 0000001b2d363fff RSI: 0000000000000008 RDI: 00007f73ba0e5720
RBP: 00007f73ba0e5720 R08: 0000000000000000 R09: 00007f73b95b6128
R10: 00007f73ba0e5700 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
INFO: task syz.2.28:6041 blocked in I/O wait for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.28 state:D stack:28232 pid:6041 tgid:6041 ppid:5773 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x1709/0x5530 kernel/sched/core.c:7231
__schedule_loop kernel/sched/core.c:7308 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7323
io_schedule+0x7f/0xd0 kernel/sched/core.c:8151
bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
__wait_on_bit+0xac/0x2f0 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x670/0x1090 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x1c3/0x590 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6427
__ext4_mark_inode_dirty+0x13e/0x700 fs/ext4/inode.c:6602
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6639
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2709
generic_update_time fs/inode.c:2254 [inline]
file_update_time_flags+0x3f4/0x4b0 fs/inode.c:2484
ext4_page_mkwrite+0x225/0x1150 fs/ext4/inode.c:6805
do_page_mkwrite+0x14a/0x310 mm/memory.c:3761
do_shared_fault mm/memory.c:6021 [inline]
do_fault mm/memory.c:6083 [inline]
do_pte_missing+0x734/0x28f0 mm/memory.c:4645
handle_pte_fault mm/memory.c:6503 [inline]
__handle_mm_fault mm/memory.c:6652 [inline]
handle_mm_fault+0xf95/0x28d0 mm/memory.c:6821
do_user_addr_fault+0xa4d/0x1340 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f001725ba23
RSP: 002b:00007fffa8a853b0 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2d524000 RSI: 0000000000040000 RDI: 00007f00175d0708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fffa8a85640
INFO: task syz.3.29:6043 blocked in I/O wait for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.29 state:D stack:27432 pid:6043 tgid:6043 ppid:5776 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x1709/0x5530 kernel/sched/core.c:7231
__schedule_loop kernel/sched/core.c:7308 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7323
io_schedule+0x7f/0xd0 kernel/sched/core.c:8151
bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
__wait_on_bit+0xac/0x2f0 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x670/0x1090 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x1c3/0x590 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6427
__ext4_mark_inode_dirty+0x13e/0x700 fs/ext4/inode.c:6602
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6639
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2709
generic_update_time fs/inode.c:2254 [inline]
file_update_time_flags+0x3f4/0x4b0 fs/inode.c:2484
ext4_page_mkwrite+0x225/0x1150 fs/ext4/inode.c:6805
do_page_mkwrite+0x14a/0x310 mm/memory.c:3761
do_shared_fault mm/memory.c:6021 [inline]
do_fault mm/memory.c:6083 [inline]
do_pte_missing+0x734/0x28f0 mm/memory.c:4645
handle_pte_fault mm/memory.c:6503 [inline]
__handle_mm_fault mm/memory.c:6652 [inline]
handle_mm_fault+0xf95/0x28d0 mm/memory.c:6821
do_user_addr_fault+0xa4d/0x1340 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f62aad6ba23
RSP: 002b:00007ffd29d1c6b0 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2d824000 RSI: 0000000000040000 RDI: 00007f62ab0e0708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffd29d1c940
INFO: task syz.1.30:6044 blocked in I/O wait for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.30 state:D stack:27472 pid:6044 tgid:6044 ppid:5770 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x1709/0x5530 kernel/sched/core.c:7231
__schedule_loop kernel/sched/core.c:7308 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7323
io_schedule+0x7f/0xd0 kernel/sched/core.c:8151
bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
__wait_on_bit+0xac/0x2f0 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x670/0x1090 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x1c3/0x590 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6427
__ext4_mark_inode_dirty+0x13e/0x700 fs/ext4/inode.c:6602
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6639
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2709
generic_update_time fs/inode.c:2254 [inline]
file_update_time_flags+0x3f4/0x4b0 fs/inode.c:2484
ext4_page_mkwrite+0x225/0x1150 fs/ext4/inode.c:6805
do_page_mkwrite+0x14a/0x310 mm/memory.c:3761
do_shared_fault mm/memory.c:6021 [inline]
do_fault mm/memory.c:6083 [inline]
do_pte_missing+0x734/0x28f0 mm/memory.c:4645
handle_pte_fault mm/memory.c:6503 [inline]
__handle_mm_fault mm/memory.c:6652 [inline]
handle_mm_fault+0xf95/0x28d0 mm/memory.c:6821
do_user_addr_fault+0xa4d/0x1340 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f2c1b93ba23
RSP: 002b:00007ffeac0bcf60 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2d424000 RSI: 0000000000040000 RDI: 00007f2c1bcb0708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffeac0bd1f0
Showing all locks held in the system:
locks held by khungtaskd/39: 1, last CPU#1:
#0: ffffffff8e3c3880 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e3c3880 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8e3c3880 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6835
locks held by kworker/u8:19/2158: 6, last CPU#0:
#0: ffff8880343f0938 ((wq_completion)bat_events){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffff8880343f0938 ((wq_completion)bat_events){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffff8880343f0938 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
#1: ffffc900084afc60 ((work_completion)(&(&bat_priv->dat.work)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#1: ffffc900084afc60 ((work_completion)(&(&bat_priv->dat.work)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#1: ffffc900084afc60 ((work_completion)(&(&bat_priv->dat.work)->work)){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
#2: ffffffff8e259320 (local_bh){.+.+}-{1:3}, at: __local_bh_disable_ip+0x3c/0x420 kernel/softirq.c:163
#3: ffffffff8e3c3880 (rcu_read_lock){....}-{1:3}, at: __local_bh_disable_ip+0x3c/0x420 kernel/softirq.c:163
#4: ffffffff8e3c3880 (rcu_read_lock){....}-{1:3}, at: spin_lock_bh include/linux/spinlock_rt.h:90 [inline]
#4: ffffffff8e3c3880 (rcu_read_lock){....}-{1:3}, at: __batadv_dat_purge+0x131/0x400 net/batman-adv/distributed-arp-table.c:174
#5: ffff88805cc64b18 (_T->lock){....}-{2:2}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#5: ffff88805cc64b18 (_T->lock){....}-{2:2}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#5: ffff88805cc64b18 (_T->lock){....}-{2:2}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
#5: ffff88805cc64b18 (_T->lock){....}-{2:2}, at: rt_spin_lock+0x1e0/0x400 kernel/locking/spinlock_rt.c:57
locks held by getty/5362: 2, on CPU#1:
#0: ffff8880342fa0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900044cb2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor/5640: 3, on CPU#1:
#0: ffff88803960c448 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x203/0x1150 fs/ext4/inode.c:6804
#2: ffff888037e1cbb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fc3/0x2210 fs/jbd2/transaction.c:444
locks held by syz.0.27/6039: 3, on CPU#1:
#0: ffff88803fe17088 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x203/0x1150 fs/ext4/inode.c:6804
#2: ffff888037e1cbb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fc3/0x2210 fs/jbd2/transaction.c:444
locks held by syz.2.28/6041: 3, on CPU#0:
#0: ffff88803a785088 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x203/0x1150 fs/ext4/inode.c:6804
#2: ffff888037e1cbb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fc3/0x2210 fs/jbd2/transaction.c:444
locks held by syz.3.29/6043: 3, on CPU#1:
#0: ffff888041a1a808 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x203/0x1150 fs/ext4/inode.c:6804
#2: ffff888037e1cbb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fc3/0x2210 fs/jbd2/transaction.c:444
locks held by syz.1.30/6044: 3, on CPU#1:
#0: ffff888040761588 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x203/0x1150 fs/ext4/inode.c:6804
#2: ffff888037e1cbb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fc3/0x2210 fs/jbd2/transaction.c:444
locks held by syz-executor/6045: 2, on CPU#0:
#0: ffff888037e10510 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494
#1: ffff8880411c27b0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1069 [inline]
#1: ffff8880411c27b0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2918 [inline]
#1: ffff8880411c27b0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2942 [inline]
#1: ffff8880411c27b0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x200/0x370 fs/namei.c:4949
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 39 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 17 Comm: pr/legacy Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:io_serial_in+0x77/0xc0 drivers/tty/serial/8250/8250_port.c:401
Code: e8 6e 3b 65 fc 44 89 f9 d3 e3 49 83 ee 80 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 2f 92 d1 fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f c3 cc cc cc cc cc 44 89 f9 80 e1 07
RSP: 0018:ffffc90000167a28 EFLAGS: 00000202
RAX: 1ffffffff340f000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff856067f0 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff9a078580 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881259f2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa2d4690910 CR3: 000000000e1b0000 CR4: 00000000003526f0
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:128 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:150 [inline]
wait_for_lsr+0x190/0x300 drivers/tty/serial/8250/8250_port.c:1982
serial8250_fifo_wait_for_lsr_thre drivers/tty/serial/8250/8250_port.c:3235 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3300 [inline]
serial8250_console_write+0x113a/0x1b40 drivers/tty/serial/8250/8250_port.c:3385
console_emit_next_record kernel/printk/printk.c:3163 [inline]
console_flush_one_record+0x667/0xb90 kernel/printk/printk.c:3268
legacy_kthread_func+0x1b6/0x250 kernel/printk/printk.c:3719
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
final repro crashed as (corrupted=false):
INFO: task syz.0.27:6039 blocked in I/O w[ 370.654657][ T39] INFO: task syz.0.27:6039 blocked in I/O wait for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.27 state:D stack:24840 pid:6039 tgid:6039 ppid:5771 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x1709/0x5530 kernel/sched/core.c:7231
__schedule_loop kernel/sched/core.c:7308 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7323
io_schedule+0x7f/0xd0 kernel/sched/core.c:8151
bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
__wait_on_bit+0xac/0x2f0 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x670/0x1090 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x1c3/0x590 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6427
__ext4_mark_inode_dirty+0x13e/0x700 fs/ext4/inode.c:6602
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6639
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2709
generic_update_time fs/inode.c:2254 [inline]
file_update_time_flags+0x3f4/0x4b0 fs/inode.c:2484
ext4_page_mkwrite+0x225/0x1150 fs/ext4/inode.c:6805
do_page_mkwrite+0x14a/0x310 mm/memory.c:3761
do_shared_fault mm/memory.c:6021 [inline]
do_fault mm/memory.c:6083 [inline]
do_pte_missing+0x734/0x28f0 mm/memory.c:4645
handle_pte_fault mm/memory.c:6503 [inline]
__handle_mm_fault mm/memory.c:6652 [inline]
handle_mm_fault+0xf95/0x28d0 mm/memory.c:6821
do_user_addr_fault+0xa4d/0x1340 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f73b91f67f1
RSP: 002b:00007fff2d70f500 EFLAGS: 00010202
RAX: 0000001b2d364000 RBX: 0000000000000000 RCX: 000000000003fde8
RDX: 0000001b2d363fff RSI: 0000000000000008 RDI: 00007f73ba0e5720
RBP: 00007f73ba0e5720 R08: 0000000000000000 R09: 00007f73b95b6128
R10: 00007f73ba0e5700 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
INFO: task syz.2.28:6041 blocked in I/O wait for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.28 state:D stack:28232 pid:6041 tgid:6041 ppid:5773 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x1709/0x5530 kernel/sched/core.c:7231
__schedule_loop kernel/sched/core.c:7308 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7323
io_schedule+0x7f/0xd0 kernel/sched/core.c:8151
bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
__wait_on_bit+0xac/0x2f0 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x670/0x1090 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x1c3/0x590 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6427
__ext4_mark_inode_dirty+0x13e/0x700 fs/ext4/inode.c:6602
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6639
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2709
generic_update_time fs/inode.c:2254 [inline]
file_update_time_flags+0x3f4/0x4b0 fs/inode.c:2484
ext4_page_mkwrite+0x225/0x1150 fs/ext4/inode.c:6805
do_page_mkwrite+0x14a/0x310 mm/memory.c:3761
do_shared_fault mm/memory.c:6021 [inline]
do_fault mm/memory.c:6083 [inline]
do_pte_missing+0x734/0x28f0 mm/memory.c:4645
handle_pte_fault mm/memory.c:6503 [inline]
__handle_mm_fault mm/memory.c:6652 [inline]
handle_mm_fault+0xf95/0x28d0 mm/memory.c:6821
do_user_addr_fault+0xa4d/0x1340 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f001725ba23
RSP: 002b:00007fffa8a853b0 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2d524000 RSI: 0000000000040000 RDI: 00007f00175d0708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fffa8a85640
INFO: task syz.3.29:6043 blocked in I/O wait for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.29 state:D stack:27432 pid:6043 tgid:6043 ppid:5776 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x1709/0x5530 kernel/sched/core.c:7231
__schedule_loop kernel/sched/core.c:7308 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7323
io_schedule+0x7f/0xd0 kernel/sched/core.c:8151
bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
__wait_on_bit+0xac/0x2f0 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x670/0x1090 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x1c3/0x590 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6427
__ext4_mark_inode_dirty+0x13e/0x700 fs/ext4/inode.c:6602
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6639
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2709
generic_update_time fs/inode.c:2254 [inline]
file_update_time_flags+0x3f4/0x4b0 fs/inode.c:2484
ext4_page_mkwrite+0x225/0x1150 fs/ext4/inode.c:6805
do_page_mkwrite+0x14a/0x310 mm/memory.c:3761
do_shared_fault mm/memory.c:6021 [inline]
do_fault mm/memory.c:6083 [inline]
do_pte_missing+0x734/0x28f0 mm/memory.c:4645
handle_pte_fault mm/memory.c:6503 [inline]
__handle_mm_fault mm/memory.c:6652 [inline]
handle_mm_fault+0xf95/0x28d0 mm/memory.c:6821
do_user_addr_fault+0xa4d/0x1340 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f62aad6ba23
RSP: 002b:00007ffd29d1c6b0 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2d824000 RSI: 0000000000040000 RDI: 00007f62ab0e0708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffd29d1c940
INFO: task syz.1.30:6044 blocked in I/O wait for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.30 state:D stack:27472 pid:6044 tgid:6044 ppid:5770 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x1709/0x5530 kernel/sched/core.c:7231
__schedule_loop kernel/sched/core.c:7308 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7323
io_schedule+0x7f/0xd0 kernel/sched/core.c:8151
bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
__wait_on_bit+0xac/0x2f0 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x670/0x1090 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d6/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0x1c3/0x590 fs/ext4/ext4_jbd2.c:241
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:6427
__ext4_mark_inode_dirty+0x13e/0x700 fs/ext4/inode.c:6602
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6639
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2709
generic_update_time fs/inode.c:2254 [inline]
file_update_time_flags+0x3f4/0x4b0 fs/inode.c:2484
ext4_page_mkwrite+0x225/0x1150 fs/ext4/inode.c:6805
do_page_mkwrite+0x14a/0x310 mm/memory.c:3761
do_shared_fault mm/memory.c:6021 [inline]
do_fault mm/memory.c:6083 [inline]
do_pte_missing+0x734/0x28f0 mm/memory.c:4645
handle_pte_fault mm/memory.c:6503 [inline]
__handle_mm_fault mm/memory.c:6652 [inline]
handle_mm_fault+0xf95/0x28d0 mm/memory.c:6821
do_user_addr_fault+0xa4d/0x1340 arch/x86/mm/fault.c:1343
handle_page_fault arch/x86/mm/fault.c:1483 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f2c1b93ba23
RSP: 002b:00007ffeac0bcf60 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2d424000 RSI: 0000000000040000 RDI: 00007f2c1bcb0708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffeac0bd1f0
Showing all locks held in the system:
locks held by khungtaskd/39: 1, last CPU#1:
#0: ffffffff8e3c3880 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e3c3880 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8e3c3880 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6835
locks held by kworker/u8:19/2158: 6, last CPU#0:
#0: ffff8880343f0938 ((wq_completion)bat_events){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffff8880343f0938 ((wq_completion)bat_events){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffff8880343f0938 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
#1: ffffc900084afc60 ((work_completion)(&(&bat_priv->dat.work)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#1: ffffc900084afc60 ((work_completion)(&(&bat_priv->dat.work)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#1: ffffc900084afc60 ((work_completion)(&(&bat_priv->dat.work)->work)){+.+.}-{0:0}, at: process_one_work+0x7fd/0x1480 kernel/workqueue.c:3344
#2: ffffffff8e259320 (local_bh){.+.+}-{1:3}, at: __local_bh_disable_ip+0x3c/0x420 kernel/softirq.c:163
#3: ffffffff8e3c3880 (rcu_read_lock){....}-{1:3}, at: __local_bh_disable_ip+0x3c/0x420 kernel/softirq.c:163
#4: ffffffff8e3c3880 (rcu_read_lock){....}-{1:3}, at: spin_lock_bh include/linux/spinlock_rt.h:90 [inline]
#4: ffffffff8e3c3880 (rcu_read_lock){....}-{1:3}, at: __batadv_dat_purge+0x131/0x400 net/batman-adv/distributed-arp-table.c:174
#5: ffff88805cc64b18 (_T->lock){....}-{2:2}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#5: ffff88805cc64b18 (_T->lock){....}-{2:2}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#5: ffff88805cc64b18 (_T->lock){....}-{2:2}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
#5: ffff88805cc64b18 (_T->lock){....}-{2:2}, at: rt_spin_lock+0x1e0/0x400 kernel/locking/spinlock_rt.c:57
locks held by getty/5362: 2, on CPU#1:
#0: ffff8880342fa0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900044cb2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor/5640: 3, on CPU#1:
#0: ffff88803960c448 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x203/0x1150 fs/ext4/inode.c:6804
#2: ffff888037e1cbb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fc3/0x2210 fs/jbd2/transaction.c:444
locks held by syz.0.27/6039: 3, on CPU#1:
#0: ffff88803fe17088 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x203/0x1150 fs/ext4/inode.c:6804
#2: ffff888037e1cbb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fc3/0x2210 fs/jbd2/transaction.c:444
locks held by syz.2.28/6041: 3, on CPU#0:
#0: ffff88803a785088 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x203/0x1150 fs/ext4/inode.c:6804
#2: ffff888037e1cbb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fc3/0x2210 fs/jbd2/transaction.c:444
locks held by syz.3.29/6043: 3, on CPU#1:
#0: ffff888041a1a808 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x203/0x1150 fs/ext4/inode.c:6804
#2: ffff888037e1cbb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fc3/0x2210 fs/jbd2/transaction.c:444
locks held by syz.1.30/6044: 3, on CPU#1:
#0: ffff888040761588 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff888037e10688 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x203/0x1150 fs/ext4/inode.c:6804
#2: ffff888037e1cbb0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fc3/0x2210 fs/jbd2/transaction.c:444
locks held by syz-executor/6045: 2, on CPU#0:
#0: ffff888037e10510 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494
#1: ffff8880411c27b0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1069 [inline]
#1: ffff8880411c27b0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2918 [inline]
#1: ffff8880411c27b0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2942 [inline]
#1: ffff8880411c27b0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x200/0x370 fs/namei.c:4949
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 39 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 17 Comm: pr/legacy Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:io_serial_in+0x77/0xc0 drivers/tty/serial/8250/8250_port.c:401
Code: e8 6e 3b 65 fc 44 89 f9 d3 e3 49 83 ee 80 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 2f 92 d1 fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f c3 cc cc cc cc cc 44 89 f9 80 e1 07
RSP: 0018:ffffc90000167a28 EFLAGS: 00000202
RAX: 1ffffffff340f000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff856067f0 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff9a078580 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881259f2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa2d4690910 CR3: 000000000e1b0000 CR4: 00000000003526f0
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:128 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:150 [inline]
wait_for_lsr+0x190/0x300 drivers/tty/serial/8250/8250_port.c:1982
serial8250_fifo_wait_for_lsr_thre drivers/tty/serial/8250/8250_port.c:3235 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3300 [inline]
serial8250_console_write+0x113a/0x1b40 drivers/tty/serial/8250/8250_port.c:3385
console_emit_next_record kernel/printk/printk.c:3163 [inline]
console_flush_one_record+0x667/0xb90 kernel/printk/printk.c:3268
legacy_kthread_func+0x1b6/0x250 kernel/printk/printk.c:3719
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245