INFO: task syz-executor.3:810 blocked for more than 143 seconds.
      Not tainted 6.8.0-rc2-next-20240202-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:26392 pid:810   tgid:809   ppid:5115   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x17df/0x4a40 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6804 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6819
 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2159
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
 __flush_workqueue+0x730/0x1630 kernel/workqueue.c:3617
 ceph_monc_stop+0x7c/0x1e0 net/ceph/mon_client.c:1248
 ceph_destroy_client+0x74/0x130 net/ceph/ceph_common.c:768
 destroy_fs_client+0x192/0x270 fs/ceph/super.c:899
 deactivate_locked_super+0xc4/0x130 fs/super.c:477
 ceph_get_tree+0x9a9/0x17b0 fs/ceph/super.c:1361
 vfs_get_tree+0x90/0x2a0 fs/super.c:1784
 vfs_cmd_create+0xe4/0x230 fs/fsopen.c:230
 __do_sys_fsconfig fs/fsopen.c:476 [inline]
 __se_sys_fsconfig+0x967/0xec0 fs/fsopen.c:349
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f9da327dda9
RSP: 002b:00007f9da3fce0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00007f9da33abf80 RCX: 00007f9da327dda9
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 00007f9da32ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9da33abf80 R15: 00007ffff66ce1a8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
3 locks held by kworker/u4:8/2804:
2 locks held by getty/4827:
 #0: ffff88802eb390a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
3 locks held by kworker/0:5/5151:
 #0: ffff888014c7cd48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3024 [inline]
 #0: ffff888014c7cd48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x14f0 kernel/workqueue.c:3125
 #1: 
ffffc9000379fd20 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3024 [inline]
ffffc9000379fd20 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x14f0 kernel/workqueue.c:3125
 #2: ffff888036fea240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x2d1/0x4130 drivers/net/netdevsim/fib.c:1489
2 locks held by kworker/u4:9/5328:
1 lock held by syz-executor.3/810:
 #0: ffff88807b51bc70 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:474 [inline]
 #0: ffff88807b51bc70 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig+0x8e6/0xec0 fs/fsopen.c:349
2 locks held by syz-executor.0/974:
 #0: ffff888035152070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:474 [inline]
 #0: ffff888035152070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig+0x8e6/0xec0 fs/fsopen.c:349
 #1: ffff8880421180e0 (&type->s_umount_key#83/1){+.+.}-{3:3}, at: alloc_super+0x20e/0x8f0 fs/super.c:345
2 locks held by syz-executor.3/1122:
 #0: ffff88807fa28470 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:474 [inline]
 #0: ffff88807fa28470 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig+0x8e6/0xec0 fs/fsopen.c:349
 #1: ffff88807883e0e0 (&type->s_umount_key#83/1){+.+.}-{3:3}, at: alloc_super+0x20e/0x8f0 fs/super.c:345
2 locks held by syz-executor.0/1442:
 #0: ffff88807fa2b870 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:474 [inline]
 #0: ffff88807fa2b870 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig+0x8e6/0xec0 fs/fsopen.c:349
 #1: ffff88803c5da0e0 (&type->s_umount_key#83/1){+.+.}-{3:3}, at: alloc_super+0x20e/0x8f0 fs/super.c:345
2 locks held by syz-executor.3/2173:
 #0: ffff888075b95070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:474 [inline]
 #0: ffff888075b95070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig+0x8e6/0xec0 fs/fsopen.c:349
 #1: 
ffff8880891300e0 (&type->s_umount_key#83/1){+.+.}-{3:3}, at: alloc_super+0x20e/0x8f0 fs/super.c:345
2 locks held by syz-executor.0/2838:
 #0: ffff888088bee070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:474 [inline]
 #0: ffff888088bee070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig+0x8e6/0xec0 fs/fsopen.c:349
 #1: ffff88804489a0e0 (&type->s_umount_key#83/1){+.+.}-{3:3}, at: alloc_super+0x20e/0x8f0 fs/super.c:345

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc2-next-20240202-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xfb0/0xff0 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5328 Comm: kworker/u4:9 Not tainted 6.8.0-rc2-next-20240202-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue:  0x0 (events_unbound)
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:200
Code: 89 fb e8 23 00 00 00 48 8b 3d 64 d1 1a 0c 48 89 de 5b e9 63 84 57 00 0f 1f 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 0c 25 00 bd 03 00 65 8b 15 70 ec
RSP: 0018:ffffc90004be7d70 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff888011210000
RDX: ffff888011210000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff888014c91000 R08: ffffffff81607ff8 R09: 1ffff11028000610
R10: dffffc0000000000 R11: ffffed1028000611 R12: ffff888023e4a100
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888025de8660
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00f7c1d50 CR3: 000000000df32000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 assign_work+0x95/0x3d0 kernel/workqueue.c:1152
 worker_thread+0xa4f/0x1000 kernel/workqueue.c:3205
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
 </TASK>