INFO: task syz.0.124:6742 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.124 state:D stack:24248 pid:6742 tgid:6741 ppid:5798 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14fb/0x52c0 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
schedule_timeout+0xc3/0x2c0 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+0x2cc/0x5e0 kernel/sched/completion.c:153
f2fs_issue_checkpoint+0x3e7/0x790 fs/f2fs/checkpoint.c:-1
f2fs_do_sync_file+0x81b/0x1a20 fs/f2fs/file.c:354
generic_write_sync include/linux/fs.h:2640 [inline]
f2fs_file_write_iter+0x74c/0x2550 fs/f2fs/file.c:5288
do_iter_readv_writev+0x62b/0x8d0 fs/read_write.c:-1
vfs_writev+0x345/0x9a0 fs/read_write.c:1059
do_pwritev fs/read_write.c:1155 [inline]
__do_sys_pwritev2 fs/read_write.c:1213 [inline]
__se_sys_pwritev2+0x187/0x2b0 fs/read_write.c:1204
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8bc19c629
RSP: 002b:00007ff8ba3f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007ff8bc415fa0 RCX: 00007ff8bc19c629
RDX: 0000000000000001 RSI: 0000200000000100 RDI: 0000000000000004
RBP: 00007ff8bc232b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000005405 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff8bc416038 R14: 00007ff8bc415fa0 R15: 00007ffcb6371c08
Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
#0: ffff88801aabc138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3250 [inline]
#0: ffff88801aabc138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9ea/0x1830 kernel/workqueue.c:3358
#1: ffffc90000117c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3251 [inline]
#1: ffffc90000117c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa25/0x1830 kernel/workqueue.c:3358
#2: ffff88802cff20d0 (&type->s_umount_key#89){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:565
1 lock held by khungtaskd/38:
#0: ffffffff8ddcd780 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8ddcd780 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8ddcd780 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:5/91:
2 locks held by getty/5549:
#0: ffff888036d5d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13c0 drivers/tty/n_tty.c:2211
4 locks held by syz-executor/5792:
2 locks held by kworker/u8:14/6511:
1 lock held by syz.0.124/6742:
#0: ffff88802cff2480 (sb_writers#18){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2710 [inline]
#0: ffff88802cff2480 (sb_writers#18){.+.+}-{0:0}, at: vfs_writev+0x2b0/0x9a0 fs/read_write.c:1057
3 locks held by f2fs_ckpt-7:0/6774:
1 lock held by udevd/7596:
2 locks held by syz.7.401/8920:
2 locks held by syz.8.399/8922:
1 lock held by syz.1.402/8925:
#0: ffff88803be500d0 (&type->s_umount_key#83/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xac0 fs/super.c:345
1 lock held by dhcpcd-run-hook/8927:
1 lock held by syz.6.404/8929:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [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:346 [inline]
watchdog+0xfd9/0x1030 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 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: 3 Comm: pool_workqueue_ Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:remove_class_from_lock_chain kernel/locking/lockdep.c:6197 [inline]
RIP: 0010:remove_class_from_lock_chains kernel/locking/lockdep.c:6236 [inline]
RIP: 0010:zap_class+0xcf/0x340 kernel/locking/lockdep.c:6281
Code: 49 81 fc 00 00 08 00 0f 84 a4 01 00 00 4e 8b 2c e5 20 a4 11 93 4d 85 ed 0f 94 c0 49 83 c5 f8 0f 94 c1 08 c1 75 d7 45 8b 75 00 <41> f6 c6 fc 0f 84 e1 00 00 00 41 c1 ee 08 4a 8d 1c 75 f0 a3 56 92
RSP: 0018:ffffc90000087c50 EFLAGS: 00000046
RAX: 0000000000023f00 RBX: ffffffff925b2220 RCX: 0000000000023f00
RDX: ffffffff9311a418 RSI: 0000000000000006 RDI: 00000000000d6283
RBP: ffffffff9355a890 R08: ffffffff81adaaa8 R09: ffffffff8ddcd780
R10: dffffc0000000000 R11: fffffbfff1ed4477 R12: 000000000004db93
R13: ffffffff939c08b0 R14: 000000000c74c820 R15: 0000000000000f2f
FS: 0000000000000000(0000) GS:ffff888126442000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fac8eadf000 CR3: 000000000dbba000 CR4: 00000000003526f0
Call Trace:
__lockdep_free_key_range kernel/locking/lockdep.c:6407 [inline]
lockdep_unregister_key+0x1c3/0x350 kernel/locking/lockdep.c:6609
wq_unregister_lockdep kernel/workqueue.c:4902 [inline]
pwq_release_workfn+0x6e7/0x880 kernel/workqueue.c:5198
kthread_worker_fn+0x509/0xb70 kernel/kthread.c:1057
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245