INFO: task syz.5.781:2773 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.781 state:D stack:0 pid:2773 tgid:2772 ppid:2091 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
ksys_sync+0x95/0x160 fs/sync.c:103
__ia32_sys_sync+0x12/0x20 fs/sync.c:114
x64_sys_call+0x2a58/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:163
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: 0033:0x7f12bdf8ebe9
RSP: 002b:00007f12bee75038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f12be1b5fa0 RCX: 00007f12bdf8ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f12be1b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f12be1b6038 R14: 00007f12be1b5fa0 R15: 00007fff9f502ba8
INFO: task syz.4.823:2891 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.823 state:D stack:0 pid:2891 tgid:2890 ppid:1523 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
ksys_sync+0x95/0x160 fs/sync.c:103
__ia32_sys_sync+0x12/0x20 fs/sync.c:114
x64_sys_call+0x2a58/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:163
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: 0033:0x7f31dc78ebe9
RSP: 002b:00007f31dd6ac038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f31dc9b5fa0 RCX: 00007f31dc78ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f31dc9b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f31dc9b6038 R14: 00007f31dc9b5fa0 R15: 00007ffc30e75928
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 cf5fa0ddcc8aee0a441189d525bb38feba3bb086
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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+0x2c7/0x370 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: 3939 Comm: syz.2.1182 Not tainted syzkaller #0 cf5fa0ddcc8aee0a441189d525bb38feba3bb086
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:filter_irq_stacks+0x36/0xa0 kernel/stacktrace.c:398
Code: 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 70 bf 67 00 49 8b 04 de 48 3d 30 02 a0 85 0f 93
RSP: 0018:ffffc9000eca6aa8 EFLAGS: 00000246
RAX: 1ffff92001d94d7d RBX: 0000000000000009 RCX: 0000000000000001
RDX: 0000000000002801 RSI: 0000000000000010 RDI: ffffc9000eca6ba0
RBP: ffffc9000eca6ad0 R08: ffffc9000eca6af0 R09: ffffc9000eca6ae8
R10: 000000000000000f R11: ffffffff81744340 R12: 0000000000000010
R13: dffffc0000000000 R14: ffffc9000eca6ba0 R15: ffffc9000eca6be8
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ca62a2c620 CR3: 000000010bfd0000 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_folios+0xcfe/0x1680 mm/page_alloc.c:2901
folios_put_refs+0x4c9/0x5c0 mm/swap.c:1038
folios_put include/linux/mm.h:1648 [inline]
__folio_batch_release+0xac/0x100 mm/swap.c:1098
folio_batch_release include/linux/pagevec.h:101 [inline]
shmem_undo_range+0x44d/0x1140 mm/shmem.c:1043
shmem_truncate_range mm/shmem.c:1156 [inline]
shmem_evict_inode+0x26e/0xa00 mm/shmem.c:1284
evict+0x4d0/0xa90 fs/inode.c:730
iput_final fs/inode.c:1889 [inline]
iput+0x639/0x8d0 fs/inode.c:1915
dentry_unlink_inode+0x373/0x420 fs/dcache.c:412
__dentry_kill+0x1b4/0x5f0 fs/dcache.c:615
shrink_kill fs/dcache.c:1060 [inline]
shrink_dentry_list+0x2e6/0x4f0 fs/dcache.c:1087
shrink_dcache_parent+0xac/0x250 fs/dcache.c:-1
do_one_tree fs/dcache.c:1550 [inline]
shrink_dcache_for_umount+0x95/0x1a0 fs/dcache.c:1567
generic_shutdown_super+0x6a/0x300 fs/super.c:623
kill_anon_super+0x4b/0x1d0 fs/super.c:1240
kill_litter_super+0x5a/0x70 fs/super.c:1250
deactivate_locked_super+0xd5/0x2a0 fs/super.c:476
deactivate_super+0xb8/0xe0 fs/super.c:509
cleanup_mnt+0x3f1/0x480 fs/namespace.c:1370
__cleanup_mnt+0x1d/0x40 fs/namespace.c:1377
task_work_run+0x1e3/0x250 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: 0033:0x7f43b11c14a5
Code: Unable to access opcode bytes at 0x7f43b11c147b.
RSP: 002b:00007f43b209af80 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f43b13b5fa0 RCX: 00007f43b11c14a5
RDX: 00007f43b209afc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f43b1211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f43b13b6038 R14: 00007f43b13b5fa0 R15: 00007ffd23f73948