INFO: task kworker/u8:10:1192 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kw[ 611.565991][ T37] task:kworker/u8:10 state:D stack:21688 pid:1192 tgid:1192 ppid:2 task_flags:0x4248060 flags:0x00080000
Workqueue: xfs-cil/loop1 xlog_cil_push_work
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_timeout+0xc0/0x2c0 kernel/time/sleep_timeout.c:75
___down_common kernel/locking/semaphore.c:293 [inline]
__down_common+0x3b7/0x850 kernel/locking/semaphore.c:318
down+0x80/0xd0 kernel/locking/semaphore.c:100
xfs_buf_lock+0x153/0x4c0 fs/xfs/xfs_buf.c:932
xfs_buf_item_unpin+0x1bb/0x6c0 fs/xfs/xfs_buf_item.c:551
xlog_cil_ail_insert fs/xfs/xfs_log_cil.c:-1 [inline]
xlog_cil_committed+0x9c6/0x1110 fs/xfs/xfs_log_cil.c:995
xlog_cil_push_work+0x24b6/0x2a90 fs/xfs/xfs_log_cil.c:1607
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
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
INFO: task syz.1.482:9757 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.482 state:D stack:22792 pid:9757 tgid:9756 ppid:5597 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_timeout+0xc0/0x2c0 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion+0x2ca/0x5e0 kernel/sched/completion.c:153
__flush_workqueue+0x709/0x1470 kernel/workqueue.c:4130
xlog_cil_push_now fs/xfs/xfs_log_cil.c:1725 [inline]
xlog_cil_force_seq+0x21a/0x880 fs/xfs/xfs_log_cil.c:1927
xfs_log_force_seq+0x196/0x440 fs/xfs/xfs_log.c:2984
__xfs_trans_commit+0x7f7/0xc20 fs/xfs/xfs_trans.c:877
xfs_trans_commit+0x13e/0x1c0 fs/xfs/xfs_trans.c:926
xfs_sync_sb_buf+0x13f/0x230 fs/xfs/libxfs/xfs_sb.c:1490
xfs_ioc_setlabel+0x1d7/0x340 fs/xfs/xfs_ioctl.c:1081
xfs_file_ioctl+0x901/0x1590 fs/xfs/xfs_ioctl.c:1238
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f71230ade59
RSP: 002b:00007f7121306028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7123335fa0 RCX: 00007f71230ade59
RDX: 00002000000004c0 RSI: 0000000041009432 RDI: 0000000000000008
RBP: 00007f7123143e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7123336038 R14: 00007f7123335fa0 R15: 00007ffe82048288
Showing all locks held in the system:
1 lock held by khungtaskd/37:
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:10/1192:
#0: ffff888061f5b138 ((wq_completion)xfs-cil/loop1){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff888061f5b138 ((wq_completion)xfs-cil/loop1){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc90005e3fc40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc90005e3fc40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
2 locks held by getty/5348:
#0: ffff888036a340a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003cbe2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
2 locks held by kworker/0:4/5602:
#0: ffff888031ff4538 ((wq_completion)xfs-sync/loop1){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff888031ff4538 ((wq_completion)xfs-sync/loop1){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc900046a7c40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc900046a7c40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
6 locks held by syz-executor/8497:
1 lock held by syz.1.482/9757:
#0: ffff888034db6500 (sb_writers#18){.+.+}-{0:0}, at: mnt_want_write_file+0x63/0x210 fs/namespace.c:538
8 locks held by kworker/u8:1/9885:
1 lock held by udevd/10114:
6 locks held by syz-executor/10899:
1 lock held by syz.6.712/11204:
#0: ffff88803a4da0d0 (&type->s_umount_key#65/1){+.+.}-{4:4}, at: alloc_super fs/super.c:345 [inline]
#0: ffff88803a4da0d0 (&type->s_umount_key#65/1){+.+.}-{4:4}, at: sget_fc+0x938/0x1910 fs/super.c:766
2 locks held by syz.9.713/11207:
1 lock held by syz.3.711/11211:
1 lock held by dhcpcd-run-hook/11217:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8497 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
RIP: 0010:_find_first_zero_bit+0x9f/0xb0 lib/find_bit.c:149
Code: f5 eb 12 49 8b 45 00 49 83 c6 08 49 83 c5 08 48 83 f8 ff 75 ba 49 83 c4 40 49 39 dc 73 c7 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 <74> d7 4c 89 f7 e8 87 ae 6d fd eb cd 0f 1f 44 00 00 90 90 90 90 90
RSP: 0018:ffffc90002f0f308 EFLAGS: 00000046
RAX: 1ffffffff26bee77 RBX: 0000000000100000 RCX: 0000000000000001
RDX: 00000000156d562a RSI: 0000000000100000 RDI: ffffffff935f24d0
RBP: caeaa7468a8c2dfb R08: ffffffff84cd58e1 R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff99cf4290 R12: 0000000000027740
R13: ffffffff935f73b8 R14: ffffffff935f73b8 R15: dffffc0000000000
FS: 000055556eb6f500(0000) GS:ffff888125d49000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fee08cf9000 CR3: 0000000064e56000 CR4: 00000000003526f0
Call Trace:
find_first_zero_bit include/linux/find.h:391 [inline]
alloc_lock_chain kernel/locking/lockdep.c:3714 [inline]
add_chain_cache kernel/locking/lockdep.c:3746 [inline]
lookup_chain_cache_add kernel/locking/lockdep.c:3855 [inline]
validate_chain kernel/locking/lockdep.c:3876 [inline]
__lock_acquire+0xb46/0x2ce0 kernel/locking/lockdep.c:5237
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
debug_object_assert_init+0xa1/0x310 lib/debugobjects.c:1070
debug_hrtimer_assert_init kernel/time/hrtimer.c:495 [inline]
hrtimer_start_range_ns+0x3d/0x3f0 kernel/time/hrtimer.c:1499
enqueue_task+0x75/0x410 kernel/sched/core.c:2184
sched_change_end+0x213/0x600 kernel/sched/core.c:11255
migrate_disable_switch kernel/sched/core.c:2465 [inline]
__schedule+0x1879/0x5500 kernel/sched/core.c:7089
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7413
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
class_preempt_destructor include/linux/preempt.h:468 [inline]
raw_spin_unlock_irqrestore_wake include/linux/sched/wake_q.h:102 [inline]
rtlock_slowlock kernel/locking/rtmutex.c:1923 [inline]
rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
__rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
rt_spin_lock_nested+0x314/0x3f0 kernel/locking/spinlock_rt.c:65
d_walk+0x484/0x6e0 fs/dcache.c:1473
shrink_dcache_tree+0x1a8/0x410 fs/dcache.c:1721
do_one_tree+0x18/0xa0 fs/dcache.c:1795
shrink_dcache_for_umount+0x111/0x510 fs/dcache.c:1812
generic_shutdown_super+0x6f/0x2d0 fs/super.c:625
kill_block_super+0x44/0x90 fs/super.c:1665
hfsplus_kill_super+0x47/0x60 fs/hfsplus/super.c:743
deactivate_locked_super+0xbc/0x130 fs/super.c:477
cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
exit_to_user_mode_loop+0x1fa/0x730 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5019cbf097
Code: a2 c7 05 5c 26 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc70c3e408 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f5019d532ca RCX: 00007f5019cbf097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc70c3e4c0
RBP: 00007ffc70c3e4c0 R08: 00007ffc70c3f4c0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc70c3f550
R13: 00007f5019d532ca R14: 0000000000095110 R15: 00007ffc70c3f590