INFO: task syz.0.1963:23320 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1963      state:D stack:25048 pid:23320 tgid:23291 ppid:19308  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5504 [inline]
 __schedule+0x16dc/0x5500 kernel/sched/core.c:7228
 __schedule_loop kernel/sched/core.c:7307 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7322
 percpu_down_write+0x2a0/0x330 kernel/locking/percpu-rwsem.c:256
 sb_wait_write fs/super.c:1790 [inline]
 freeze_super+0x4e9/0x11b0 fs/super.c:2054
 fs_bdev_freeze+0x1a3/0x310 fs/super.c:1482
 bdev_freeze+0xd8/0x220 block/bdev.c:314
 f2fs_do_shutdown+0x237/0x590 fs/f2fs/file.c:2452
 f2fs_ioc_shutdown fs/f2fs/file.c:2544 [inline]
 __f2fs_ioctl+0x3fe1/0xbbe0 fs/f2fs/file.c:4665
 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: 0033:0x7f429d15ce59
RSP: 002b:00007f429b395028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f429d3d6090 RCX: 00007f429d15ce59
RDX: 0000200000000080 RSI: 000000008004587d RDI: 0000000000000006
RBP: 00007f429d1f2d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f429d3d6128 R14: 00007f429d3d6090 R15: 00007ffefe711ce8
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 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: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
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events_power_efficient gc_worker
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x18/0xa0 kernel/kcov.c:314
Code: 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0d c8 1d 84 10 65 44 8b 05 e8 1d 84 10 <41> 81 e0 00 00 ff 00 ba 00 01 00 00 23 91 f4 0b 00 00 41 89 d1 45
RSP: 0018:ffffc900000f7998 EFLAGS: 00000246
RAX: ffffffff893f64a3 RBX: 0000000000001511 RCX: ffff88801c6f3e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900000f7af0 R08: 0000000080000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1ed067f R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000002a23
FS:  0000000000000000(0000) GS:ffff888126391000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efedffbd58c CR3: 000000009f10a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rcu_read_unlock include/linux/rcupdate.h:869 [inline]
 gc_worker+0xaf3/0x12e0 net/netfilter/nf_conntrack_core.c:1621
 process_one_work kernel/workqueue.c:3314 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478
 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
 </TASK>