INFO: task syz-executor:5624 blocked in I/O wait for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22568 pid:5624 tgid:5624 ppid:5623 task_flags:0x440100 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__wait_on_bit+0xac/0x300 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+0x658/0x10c0 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:2264 [inline]
file_update_time_flags+0x399/0x440 fs/inode.c:2494
ext4_page_mkwrite+0x21f/0x1470 fs/ext4/inode.c:7864
do_page_mkwrite+0x147/0x310 mm/memory.c:3884
wp_page_shared mm/memory.c:4288 [inline]
do_wp_page+0x1a85/0x4b80 mm/memory.c:4511
handle_pte_fault mm/memory.c:6684 [inline]
__handle_mm_fault mm/memory.c:6809 [inline]
handle_mm_fault+0x19c9/0x2f80 mm/memory.c:6976
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: 0033:0x7fa474c715e3
RSP: 002b:00007fffa5aa8670 EFLAGS: 00010206
RAX: 00007fa471dffebc RBX: 00007fffa5aa87a0 RCX: 0000000000000000
RDX: 00007fa471dffeb8 RSI: 0000000000000008 RDI: 00007fffa5aa87a0
RBP: 00000000000003e6 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fffa5aa8780 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000144 R14: fffffffffffffebc R15: 0000000000000000
INFO: task syz.1.897:10577 blocked in I/O wait for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.897 state:D stack:26936 pid:10577 tgid:10577 ppid:9491 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__wait_on_bit+0xac/0x300 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+0x658/0x10c0 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:2264 [inline]
touch_atime+0x568/0x670 fs/inode.c:2339
file_accessed include/linux/fs.h:2283 [inline]
ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:919
vfs_mmap_prepare include/linux/fs.h:2075 [inline]
call_mmap_prepare mm/vma.c:2947 [inline]
__mmap_region mm/vma.c:3064 [inline]
mmap_region+0xef9/0x2840 mm/vma.c:3162
do_mmap+0xe0a/0x1300 mm/mmap.c:573
vm_mmap_pgoff+0x27a/0x520 mm/util.c:581
ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:619
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff283f9f2c2
RSP: 002b:00007fff456ba0c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b2cc64000 RCX: 00007ff283f9f2c2
RDX: 0000000000000003 RSI: 00000000003c0000 RDI: 0000001b2cc64000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 000000000000001b
R13: 00000000000927c0 R14: 00000000000a630b R15: 00007fff456ba3a0
INFO: task syz.2.896:10578 blocked in I/O wait for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.896 state:D stack:26936 pid:10578 tgid:10578 ppid:5636 task_flags:0x440040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
__wait_on_bit+0xac/0x300 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+0x658/0x10c0 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:2264 [inline]
touch_atime+0x568/0x670 fs/inode.c:2339
file_accessed include/linux/fs.h:2283 [inline]
ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:919
vfs_mmap_prepare include/linux/fs.h:2075 [inline]
call_mmap_prepare mm/vma.c:2947 [inline]
__mmap_region mm/vma.c:3064 [inline]
mmap_region+0xef9/0x2840 mm/vma.c:3162
do_mmap+0xe0a/0x1300 mm/mmap.c:573
vm_mmap_pgoff+0x27a/0x520 mm/util.c:581
ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:619
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7b5b99f2c2
RSP: 002b:00007ffcc5527cf8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b2cc64000 RCX: 00007f7b5b99f2c2
RDX: 0000000000000003 RSI: 00000000005c0000 RDI: 0000001b2cc64000
RBP: 0000000000100001 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 00000000000000ce
R13: 00000000000927c0 R14: 00000000000a613d R15: 00007ffcc5527fd0
Showing all locks held in the system:
locks held by khungtaskd/35: 1, last CPU#0:
#0: ffffffff9015a420 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff9015a420 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff9015a420 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by getty/5394: 2, on CPU#1:
#0: ffff888036fe40a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000324b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor/5624: 3, on CPU#1:
#0: ffff88807d522588 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:339
#1: ffff8880359be570 (sb_pagefaults){++++}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
#1: ffff8880359be570 (sb_pagefaults){++++}-{0:0}, at: ext4_page_mkwrite+0x1fe/0x1470 fs/ext4/inode.c:7863
#2: ffff8880359bc950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz-executor/10435: 3, on CPU#0:
#0: ffff8880359be478 (sb_writers#4){++++}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:531
#1: ffff888069d4cc00 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1071 [inline]
#1: ffff888069d4cc00 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2924 [inline]
#1: ffff888069d4cc00 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2948 [inline]
#1: ffff888069d4cc00 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x200/0x370 fs/namei.c:5108
#2: ffff8880359bc950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.1.897/10577: 3, on CPU#1:
#0: ffff888076864080 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:566 [inline]
#0: ffff888076864080 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1ed/0x520 mm/util.c:579
#1: ffff8880359be478 (sb_writers#4){++++}-{0:0}, at: file_accessed include/linux/fs.h:2283 [inline]
#1: ffff8880359be478 (sb_writers#4){++++}-{0:0}, at: ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:919
#2: ffff8880359bc950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
locks held by syz.2.896/10578: 3, on CPU#0:
#0: ffff888076862800 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:566 [inline]
#0: ffff888076862800 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1ed/0x520 mm/util.c:579
#1: ffff8880359be478 (sb_writers#4){++++}-{0:0}, at: file_accessed include/linux/fs.h:2283 [inline]
#1: ffff8880359be478 (sb_writers#4){++++}-{0:0}, at: ext4_file_mmap_prepare+0x277/0x450 fs/ext4/file.c:919
#2: ffff8880359bc950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
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/0x480 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
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: 2b 93 02 c3 cc cc cc cc 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 03 cb 24 00 fb f4 3c 17 03 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc900001c7e40 EFLAGS: 00000246
RAX: 0000000000ff6cc3 RBX: ffffffff819c9cb0 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e6a8c20 RDI: ffffffff8c8ea380
RBP: ffffc900001c7f10 R08: ffff8880b8333d9b R09: 1ffff110170667b3
R10: dffffc0000000000 R11: ffffed10170667b4 R12: 0000000000000000
R13: 1ffff11003e573e8 R14: 1ffff92000038fd0 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff88812350b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c98fd72660 CR3: 000000000ff48000 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
start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x157