INFO: task syz.3.2021:6247 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.2021 state:D stack:0 pid:6247 tgid:6246 ppid:292 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
super_lock+0x150/0x300 fs/super.c:115
super_lock_shared fs/super.c:140 [inline]
iterate_supers+0x8a/0x560 fs/super.c:934
quota_sync_all fs/quota/quota.c:69 [inline]
__do_sys_quotactl fs/quota/quota.c:938 [inline]
__se_sys_quotactl+0x308/0x7d0 fs/quota/quota.c:917
__x64_sys_quotactl+0x9f/0xc0 fs/quota/quota.c:917
x64_sys_call+0x2818/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:180
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fa40498f6c9
RSP: 002b:00007fa4057b8038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fa404be5fa0 RCX: 00007fa40498f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007fa404a11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa404be6038 R14: 00007fa404be5fa0 R15: 00007ffd806ccb48
INFO: task syz.3.2021:6249 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.2021 state:D stack:0 pid:6249 tgid:6246 ppid:292 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
super_lock+0x150/0x300 fs/super.c:115
super_lock_shared fs/super.c:140 [inline]
iterate_supers+0x8a/0x560 fs/super.c:934
quota_sync_all fs/quota/quota.c:69 [inline]
__do_sys_quotactl fs/quota/quota.c:938 [inline]
__se_sys_quotactl+0x308/0x7d0 fs/quota/quota.c:917
__x64_sys_quotactl+0x9f/0xc0 fs/quota/quota.c:917
x64_sys_call+0x2818/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:180
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fa40498f6c9
RSP: 002b:00007fa405797038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fa404be6090 RCX: 00007fa40498f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007fa404a11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa404be6128 R14: 00007fa404be6090 R15: 00007ffd806ccb48
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2bf/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xd8f/0xed0 kernel/hung_task.c:423
kthread+0x2ca/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10274 Comm: syz-executor Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:filter_irq_stacks+0x2d/0xa0 kernel/stacktrace.c:398
Code: fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 85 f6 74 70 49 89 fe 41 89 f4 31 db 49 bd 00 00 00 00 00 fc ff df 49 89 ff 4c 89 f8 <48> c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 50 0a 68 00 49 8b 04
RSP: 0018:ffffc9000e3b74a8 EFLAGS: 00000206
RAX: ffffc9000e3b75f8 RBX: 000000000000000b RCX: 0000000000000001
RDX: 0000000000002801 RSI: 000000000000000e RDI: ffffc9000e3b75a0
RBP: ffffc9000e3b74d0 R08: ffffc9000e3b74f0 R09: ffffc9000e3b74e8
R10: 000000000000000d R11: ffffffff817457d0 R12: 000000000000000e
R13: dffffc0000000000 R14: ffffc9000e3b75a0 R15: ffffc9000e3b75f8
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005584a40f0ff0 CR3: 000000010b752000 CR4: 00000000003526b0
Call Trace:
stack_depot_save_flags+0x38/0x800 lib/stackdepot.c:609
stack_depot_save+0x12/0x20 lib/stackdepot.c:686
save_stack+0x106/0x1f0 mm/page_owner.c:175
__reset_page_owner+0x79/0x450 mm/page_owner.c:315
reset_page_owner include/linux/page_owner.h:28 [inline]
free_pages_prepare mm/page_alloc.c:1352 [inline]
free_unref_page+0xb4d/0xee0 mm/page_alloc.c:2842
__free_pages+0x6b/0x3b0 mm/page_alloc.c:5351
vfree+0x3bf/0x580 mm/vmalloc.c:3396
kcov_put kernel/kcov.c:439 [inline]
kcov_close+0x2c/0x70 kernel/kcov.c:535
__fput+0x1fb/0xa00 fs/file_table.c:429
____fput+0x20/0x30 fs/file_table.c:457
task_work_run+0x1e0/0x250 kernel/task_work.c:240
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x9bc/0x2630 kernel/exit.c:953
do_group_exit+0x22a/0x300 kernel/exit.c:1095
get_signal+0x139d/0x14f0 kernel/signal.c:2933
arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f5533f857d3
Code: Unable to access opcode bytes at 0x7f5533f857a9.
RSP: 002b:00007ffc7151c368 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 0000000000002826 RCX: 00007f5533f857d3
RDX: 0000000040000000 RSI: 00007ffc7151c37c RDI: 00000000ffffffff
RBP: 00007ffc7151c37c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffc7151c668 R15: 0000000000000000