Extracting prog: 6m2.142000979s
Minimizing prog: 1h3m6.971186887s
Simplifying prog options: 15m50.004484466s
Extracting C: 5m7.728735104s
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:5 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}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000480)='./sys\x00', &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f0000000540)="02155e", 0x3, 0x2)
program crashed: INFO: task hung in jbd2_journal_commit_transaction
single: successfully extracted reproducer
found reproducer with 4 syscalls
minimizing guilty program
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-openat
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000480)='./sys\x00', &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000480)='./sys\x00', &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
pwrite64(0xffffffffffffffff, &(0x7f0000000540)="02155e", 0x3, 0x2)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f0000000540)="02155e", 0x3, 0x2)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): mount-openat-pwrite64
detailed listing:
executing program 0:
mount(0x0, &(0x7f0000000480)='./sys\x00', &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f0000000540)="02155e", 0x3, 0x2)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
mount(0x0, &(0x7f0000000480)='./sys\x00', &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f0000000540)="02155e", 0x3, 0x2)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
mount(0x0, 0x0, &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f0000000540)="02155e", 0x3, 0x2)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000480)='./sys\x00', 0x0, 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f0000000540)="02155e", 0x3, 0x2)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000480)='./sys\x00', &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, 0x0, 0x2, 0x0)
pwrite64(r0, &(0x7f0000000540)="02155e", 0x3, 0x2)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000480)='./sys\x00', &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, 0x0, 0x0, 0x2)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000480)='./sys\x00', &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f0000000540), 0x0, 0x2)
program did not crash
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-openat-pwrite64
program crashed: INFO: task hung in do_get_write_access
a never seen crash title: INFO: task hung in do_get_write_access, ignore
simplifying guilty program options
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000480)='./sys\x00', &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f0000000540)="02155e", 0x3, 0x2)
program crashed: INFO: task hung in jbd2_journal_commit_transaction
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-openat-pwrite64
program crashed: INFO: task hung in do_get_write_access
a never seen crash title: INFO: task hung in do_get_write_access, ignore
testing program (duration=6m0s, {Threaded:false 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}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000480)='./sys\x00', &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f0000000540)="02155e", 0x3, 0x2)
program crashed: INFO: task hung in do_get_write_access
a never seen crash title: INFO: task hung in do_get_write_access, ignore
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000480)='./sys\x00', &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f0000000540)="02155e", 0x3, 0x2)
program crashed: INFO: task hung in jbd2_journal_commit_transaction
validation run: crashed=true
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000480)='./sys\x00', &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f0000000540)="02155e", 0x3, 0x2)
program crashed: INFO: task hung in corrupted
validation run: crashed=true
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 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}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000480)='./sys\x00', &(0x7f00000004c0)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000500)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f0000000540)="02155e", 0x3, 0x2)
program crashed: INFO: task hung in do_get_write_access
validation run: crashed=true
reproducing took 1h44m40.507874703s
repro crashed as (corrupted=false):
INFO: task syz.0.67:6158 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.0.67 state:D stack:27216 pid:6158 tgid:6158 ppid:5800 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x171d/0x56f0 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x80/0xe0 kernel/sched/core.c:8146
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__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:106 [inline]
do_get_write_access+0x667/0x10d0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451
__ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751
generic_update_time fs/inode.c:2263 [inline]
file_update_time_flags+0x39f/0x450 fs/inode.c:2493
ext4_page_mkwrite+0x220/0x1490 fs/ext4/inode.c:7864
do_page_mkwrite+0x14a/0x310 mm/memory.c:3879
do_shared_fault mm/memory.c:6145 [inline]
do_fault mm/memory.c:6207 [inline]
do_pte_missing+0x717/0x2970 mm/memory.c:4763
handle_pte_fault mm/memory.c:6627 [inline]
__handle_mm_fault mm/memory.c:6776 [inline]
handle_mm_fault+0xf64/0x28c0 mm/memory.c:6943
do_user_addr_fault+0xb35/0x1480 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: 0033:0x7f30f5d17d51
RSP: 002b:00007fffb94ff090 EFLAGS: 00010202
RAX: 0000001b2f164000 RBX: 0000000000000000 RCX: 000000000003fde8
RDX: 0000001b2f163fff RSI: 0000000000000008 RDI: 00007f30f6c05720
RBP: 00007f30f6c05720 R08: 0000000000000000 R09: 00007f30f60d6038
R10: 00007f30f6c05700 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
INFO: task syz.4.69:6159 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.4.69 state:D stack:26872 pid:6159 tgid:6159 ppid:5819 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x171d/0x56f0 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x80/0xe0 kernel/sched/core.c:8146
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__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:106 [inline]
do_get_write_access+0x667/0x10d0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451
__ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751
generic_update_time fs/inode.c:2263 [inline]
file_update_time_flags+0x39f/0x450 fs/inode.c:2493
ext4_page_mkwrite+0x220/0x1490 fs/ext4/inode.c:7864
do_page_mkwrite+0x14a/0x310 mm/memory.c:3879
do_shared_fault mm/memory.c:6145 [inline]
do_fault mm/memory.c:6207 [inline]
do_pte_missing+0x717/0x2970 mm/memory.c:4763
handle_pte_fault mm/memory.c:6627 [inline]
__handle_mm_fault mm/memory.c:6776 [inline]
handle_mm_fault+0xf64/0x28c0 mm/memory.c:6943
do_user_addr_fault+0xb35/0x1480 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: 0033:0x7f7d8fc0c7c3
RSP: 002b:00007ffc0e7a1460 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b30224000 RSI: 0000000000040000 RDI: 00007f7d8ff88708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc0e7a16f0
INFO: task syz.1.18:6160 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.1.18 state:D stack:27592 pid:6160 tgid:6160 ppid:5802 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x171d/0x56f0 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x80/0xe0 kernel/sched/core.c:8146
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__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:106 [inline]
do_get_write_access+0x667/0x10d0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451
__ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751
generic_update_time fs/inode.c:2263 [inline]
file_update_time_flags+0x39f/0x450 fs/inode.c:2493
ext4_page_mkwrite+0x220/0x1490 fs/ext4/inode.c:7864
do_page_mkwrite+0x14a/0x310 mm/memory.c:3879
do_shared_fault mm/memory.c:6145 [inline]
do_fault mm/memory.c:6207 [inline]
do_pte_missing+0x717/0x2970 mm/memory.c:4763
handle_pte_fault mm/memory.c:6627 [inline]
__handle_mm_fault mm/memory.c:6776 [inline]
handle_mm_fault+0xf64/0x28c0 mm/memory.c:6943
do_user_addr_fault+0xb35/0x1480 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: 0033:0x7f4156e7c7c3
RSP: 002b:00007ffdae931110 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2f224000 RSI: 0000000000040000 RDI: 00007f41571f8708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffdae9313a0
INFO: task syz.2.72:6161 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.2.72 state:D stack:28232 pid:6161 tgid:6161 ppid:5806 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x171d/0x56f0 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x80/0xe0 kernel/sched/core.c:8146
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__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:106 [inline]
do_get_write_access+0x667/0x10d0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451
__ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751
generic_update_time fs/inode.c:2263 [inline]
file_update_time_flags+0x39f/0x450 fs/inode.c:2493
ext4_page_mkwrite+0x220/0x1490 fs/ext4/inode.c:7864
do_page_mkwrite+0x14a/0x310 mm/memory.c:3879
do_shared_fault mm/memory.c:6145 [inline]
do_fault mm/memory.c:6207 [inline]
do_pte_missing+0x717/0x2970 mm/memory.c:4763
handle_pte_fault mm/memory.c:6627 [inline]
__handle_mm_fault mm/memory.c:6776 [inline]
handle_mm_fault+0xf64/0x28c0 mm/memory.c:6943
do_user_addr_fault+0xb35/0x1480 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: 0033:0x7f9577c5c7c3
RSP: 002b:00007fff93d74480 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2f324000 RSI: 0000000000040000 RDI: 00007f9577fd8708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff93d74710
INFO: task syz.3.71:6162 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.3.71 state:D stack:27368 pid:6162 tgid:6162 ppid:5810 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x171d/0x56f0 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x80/0xe0 kernel/sched/core.c:8146
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__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:106 [inline]
do_get_write_access+0x667/0x10d0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451
__ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751
generic_update_time fs/inode.c:2263 [inline]
file_update_time_flags+0x39f/0x450 fs/inode.c:2493
ext4_page_mkwrite+0x220/0x1490 fs/ext4/inode.c:7864
do_page_mkwrite+0x14a/0x310 mm/memory.c:3879
do_shared_fault mm/memory.c:6145 [inline]
do_fault mm/memory.c:6207 [inline]
do_pte_missing+0x717/0x2970 mm/memory.c:4763
handle_pte_fault mm/memory.c:6627 [inline]
__handle_mm_fault mm/memory.c:6776 [inline]
handle_mm_fault+0xf64/0x28c0 mm/memory.c:6943
do_user_addr_fault+0xb35/0x1480 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: 0033:0x7fc3dfa9c7c3
RSP: 002b:00007ffcdd85ffd0 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2f824000 RSI: 0000000000040000 RDI: 00007fc3dfe18708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffcdd860260
Showing all locks held in the system:
locks held by khungtaskd/38: 1, last CPU#1:
#0: ffffffff8f3c15c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8f3c15c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8f3c15c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by getty/5365: 2, on CPU#0:
#0: ffff8880377140a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900044f32e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor/5620: 3, on CPU#0:
#0: ffff88802d89b6c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:337
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1ff/0x1490 fs/ext4/inode.c:7863
#2: ffff888036488bd0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.0.67/6158: 3, on CPU#1:
#0: ffff888044201308 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:337
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1ff/0x1490 fs/ext4/inode.c:7863
#2: ffff888036488bd0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.4.69/6159: 3, on CPU#0:
#0: ffff8880455a9948 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:337
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1ff/0x1490 fs/ext4/inode.c:7863
#2: ffff888036488bd0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.1.18/6160: 3, on CPU#0:
#0: ffff8880359e1948 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:337
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1ff/0x1490 fs/ext4/inode.c:7863
#2: ffff888036488bd0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.2.72/6161: 3, on CPU#0:
#0: ffff88804552a308 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:337
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1ff/0x1490 fs/ext4/inode.c:7863
#2: ffff888036488bd0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.3.71/6162: 3, on CPU#0:
#0: ffff8880455ad308 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:337
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1ff/0x1490 fs/ext4/inode.c:7863
#2: ffff888036488bd0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz-executor/6163: 2, on CPU#1:
#0: ffff88803648c528 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:531
#1: ffff888041420f70 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1071 [inline]
#1: ffff888041420f70 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2924 [inline]
#1: ffff888041420f70 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2948 [inline]
#1: ffff888041420f70 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x200/0x370 fs/namei.c:5108
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [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:377 [inline]
watchdog+0x1073/0x10f0 kernel/hung_task.c:598
kthread+0x38b/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: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 8b 67 02 e9 c3 e6 03 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 43 84 15 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8f007ca0 EFLAGS: 00000242
RAX: 00000000000d13d9 RBX: ffffffff819b6900 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8dafbdfb RDI: ffffffff8bed2a80
RBP: ffffffff8f007d78 R08: ffff8880b84341db R09: 1ffff1101708683b
R10: dffffc0000000000 R11: ffffed101708683c R12: 0000000000000000
R13: 1ffffffff1e1edf8 R14: 1ffffffff1e00f9c R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888124716000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563210de7660 CR3: 000000000f1b0000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/kernel/process.c:767 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:768
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x2e0/0x540 kernel/sched/idle.c:355
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:458
rest_init+0x378/0x3a0 init/main.c:789
start_kernel+0x392/0x3e0 init/main.c:1247
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x137/0x1b0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x157
final repro crashed as (corrupted=false):
INFO: task syz.0.67:6158 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.0.67 state:D stack:27216 pid:6158 tgid:6158 ppid:5800 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x171d/0x56f0 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x80/0xe0 kernel/sched/core.c:8146
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__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:106 [inline]
do_get_write_access+0x667/0x10d0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451
__ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751
generic_update_time fs/inode.c:2263 [inline]
file_update_time_flags+0x39f/0x450 fs/inode.c:2493
ext4_page_mkwrite+0x220/0x1490 fs/ext4/inode.c:7864
do_page_mkwrite+0x14a/0x310 mm/memory.c:3879
do_shared_fault mm/memory.c:6145 [inline]
do_fault mm/memory.c:6207 [inline]
do_pte_missing+0x717/0x2970 mm/memory.c:4763
handle_pte_fault mm/memory.c:6627 [inline]
__handle_mm_fault mm/memory.c:6776 [inline]
handle_mm_fault+0xf64/0x28c0 mm/memory.c:6943
do_user_addr_fault+0xb35/0x1480 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: 0033:0x7f30f5d17d51
RSP: 002b:00007fffb94ff090 EFLAGS: 00010202
RAX: 0000001b2f164000 RBX: 0000000000000000 RCX: 000000000003fde8
RDX: 0000001b2f163fff RSI: 0000000000000008 RDI: 00007f30f6c05720
RBP: 00007f30f6c05720 R08: 0000000000000000 R09: 00007f30f60d6038
R10: 00007f30f6c05700 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
INFO: task syz.4.69:6159 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.4.69 state:D stack:26872 pid:6159 tgid:6159 ppid:5819 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x171d/0x56f0 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x80/0xe0 kernel/sched/core.c:8146
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__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:106 [inline]
do_get_write_access+0x667/0x10d0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451
__ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751
generic_update_time fs/inode.c:2263 [inline]
file_update_time_flags+0x39f/0x450 fs/inode.c:2493
ext4_page_mkwrite+0x220/0x1490 fs/ext4/inode.c:7864
do_page_mkwrite+0x14a/0x310 mm/memory.c:3879
do_shared_fault mm/memory.c:6145 [inline]
do_fault mm/memory.c:6207 [inline]
do_pte_missing+0x717/0x2970 mm/memory.c:4763
handle_pte_fault mm/memory.c:6627 [inline]
__handle_mm_fault mm/memory.c:6776 [inline]
handle_mm_fault+0xf64/0x28c0 mm/memory.c:6943
do_user_addr_fault+0xb35/0x1480 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: 0033:0x7f7d8fc0c7c3
RSP: 002b:00007ffc0e7a1460 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b30224000 RSI: 0000000000040000 RDI: 00007f7d8ff88708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc0e7a16f0
INFO: task syz.1.18:6160 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.1.18 state:D stack:27592 pid:6160 tgid:6160 ppid:5802 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x171d/0x56f0 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x80/0xe0 kernel/sched/core.c:8146
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__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:106 [inline]
do_get_write_access+0x667/0x10d0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451
__ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751
generic_update_time fs/inode.c:2263 [inline]
file_update_time_flags+0x39f/0x450 fs/inode.c:2493
ext4_page_mkwrite+0x220/0x1490 fs/ext4/inode.c:7864
do_page_mkwrite+0x14a/0x310 mm/memory.c:3879
do_shared_fault mm/memory.c:6145 [inline]
do_fault mm/memory.c:6207 [inline]
do_pte_missing+0x717/0x2970 mm/memory.c:4763
handle_pte_fault mm/memory.c:6627 [inline]
__handle_mm_fault mm/memory.c:6776 [inline]
handle_mm_fault+0xf64/0x28c0 mm/memory.c:6943
do_user_addr_fault+0xb35/0x1480 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: 0033:0x7f4156e7c7c3
RSP: 002b:00007ffdae931110 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2f224000 RSI: 0000000000040000 RDI: 00007f41571f8708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffdae9313a0
INFO: task syz.2.72:6161 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.2.72 state:D stack:28232 pid:6161 tgid:6161 ppid:5806 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x171d/0x56f0 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x80/0xe0 kernel/sched/core.c:8146
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__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:106 [inline]
do_get_write_access+0x667/0x10d0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451
__ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751
generic_update_time fs/inode.c:2263 [inline]
file_update_time_flags+0x39f/0x450 fs/inode.c:2493
ext4_page_mkwrite+0x220/0x1490 fs/ext4/inode.c:7864
do_page_mkwrite+0x14a/0x310 mm/memory.c:3879
do_shared_fault mm/memory.c:6145 [inline]
do_fault mm/memory.c:6207 [inline]
do_pte_missing+0x717/0x2970 mm/memory.c:4763
handle_pte_fault mm/memory.c:6627 [inline]
__handle_mm_fault mm/memory.c:6776 [inline]
handle_mm_fault+0xf64/0x28c0 mm/memory.c:6943
do_user_addr_fault+0xb35/0x1480 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: 0033:0x7f9577c5c7c3
RSP: 002b:00007fff93d74480 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2f324000 RSI: 0000000000040000 RDI: 00007f9577fd8708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff93d74710
INFO: task syz.3.71:6162 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.3.71 state:D stack:27368 pid:6162 tgid:6162 ppid:5810 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x171d/0x56f0 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x80/0xe0 kernel/sched/core.c:8146
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__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:106 [inline]
do_get_write_access+0x667/0x10d0 fs/jbd2/transaction.c:1113
jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
__ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:253
ext4_reserve_inode_write+0x294/0x360 fs/ext4/inode.c:7451
__ext4_mark_inode_dirty+0x141/0x7e0 fs/ext4/inode.c:7642
ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:7679
__mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2751
generic_update_time fs/inode.c:2263 [inline]
file_update_time_flags+0x39f/0x450 fs/inode.c:2493
ext4_page_mkwrite+0x220/0x1490 fs/ext4/inode.c:7864
do_page_mkwrite+0x14a/0x310 mm/memory.c:3879
do_shared_fault mm/memory.c:6145 [inline]
do_fault mm/memory.c:6207 [inline]
do_pte_missing+0x717/0x2970 mm/memory.c:4763
handle_pte_fault mm/memory.c:6627 [inline]
__handle_mm_fault mm/memory.c:6776 [inline]
handle_mm_fault+0xf64/0x28c0 mm/memory.c:6943
do_user_addr_fault+0xb35/0x1480 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: 0033:0x7fc3dfa9c7c3
RSP: 002b:00007ffcdd85ffd0 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b2f824000 RSI: 0000000000040000 RDI: 00007fc3dfe18708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffcdd860260
Showing all locks held in the system:
locks held by khungtaskd/38: 1, last CPU#1:
#0: ffffffff8f3c15c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8f3c15c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8f3c15c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by getty/5365: 2, on CPU#0:
#0: ffff8880377140a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900044f32e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor/5620: 3, on CPU#0:
#0: ffff88802d89b6c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:337
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1ff/0x1490 fs/ext4/inode.c:7863
#2: ffff888036488bd0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.0.67/6158: 3, on CPU#1:
#0: ffff888044201308 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:337
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1ff/0x1490 fs/ext4/inode.c:7863
#2: ffff888036488bd0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.4.69/6159: 3, on CPU#0:
#0: ffff8880455a9948 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:337
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1ff/0x1490 fs/ext4/inode.c:7863
#2: ffff888036488bd0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.1.18/6160: 3, on CPU#0:
#0: ffff8880359e1948 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:337
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1ff/0x1490 fs/ext4/inode.c:7863
#2: ffff888036488bd0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.2.72/6161: 3, on CPU#0:
#0: ffff88804552a308 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:337
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1ff/0x1490 fs/ext4/inode.c:7863
#2: ffff888036488bd0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.3.71/6162: 3, on CPU#0:
#0: ffff8880455ad308 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:337
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff88803648c6a0 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1ff/0x1490 fs/ext4/inode.c:7863
#2: ffff888036488bd0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz-executor/6163: 2, on CPU#1:
#0: ffff88803648c528 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:531
#1: ffff888041420f70 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1071 [inline]
#1: ffff888041420f70 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2924 [inline]
#1: ffff888041420f70 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2948 [inline]
#1: ffff888041420f70 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x200/0x370 fs/namei.c:5108
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [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:377 [inline]
watchdog+0x1073/0x10f0 kernel/hung_task.c:598
kthread+0x38b/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: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 8b 67 02 e9 c3 e6 03 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 43 84 15 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8f007ca0 EFLAGS: 00000242
RAX: 00000000000d13d9 RBX: ffffffff819b6900 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8dafbdfb RDI: ffffffff8bed2a80
RBP: ffffffff8f007d78 R08: ffff8880b84341db R09: 1ffff1101708683b
R10: dffffc0000000000 R11: ffffed101708683c R12: 0000000000000000
R13: 1ffffffff1e1edf8 R14: 1ffffffff1e00f9c R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888124716000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563210de7660 CR3: 000000000f1b0000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/kernel/process.c:767 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:768
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x2e0/0x540 kernel/sched/idle.c:355
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:458
rest_init+0x378/0x3a0 init/main.c:789
start_kernel+0x392/0x3e0 init/main.c:1247
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x137/0x1b0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x157