INFO: task syz-executor:5849 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:16424 pid:5849  tgid:5849  ppid:1      task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 __closure_sync+0x163/0x220
 bch2_journal_flush_pins+0x18e/0x250
 __bch2_fs_read_only+0x144/0x5b0
 bch2_fs_read_only+0x42a/0xb00
 __bch2_fs_stop+0x100/0x900
 generic_shutdown_super+0x135/0x2c0
 bch2_kill_sb+0x41/0x50
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdf4a18ff17
RSP: 002b:00007ffdfe9f5d48 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fdf4a211c05 RCX: 00007fdf4a18ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdfe9f5e00
RBP: 00007ffdfe9f5e00 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdfe9f6e90
R13: 00007fdf4a211c05 R14: 000000000000f12a R15: 00007ffdfe9f6ed0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139f20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u10:3/2188:
 #0: ffff888032102148 ((wq_completion)btree_update){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000aaf7bc0 ((work_completion)(&c->btree_interior_update_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff88802a484398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: bch2_trans_srcu_lock+0xaf/0x220
 #3: ffff88802a4a6710 (&c->gc_lock){++++}-{4:4}, at: bch2_btree_update_start+0x542/0x1de0
2 locks held by getty/5674:
 #0: ffff8880230ba0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
2 locks held by syz-executor/5849:
 #0: ffff8881072900e0 (&type->s_umount_key#60){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff88802a480278 (&c->state_lock){++++}-{4:4}, at: __bch2_fs_stop+0xf8/0x900
1 lock held by syz.6.621/9489:
 #0: ffff8881072900e0 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x2a9/0x3b0

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7097 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:update_rq_clock+0x2c5/0x5b0
Code: 89 ff e8 8e 09 93 00 4d 01 2f f3 0f 1e fa 4c 8d bb 08 0b 00 00 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 6b 09 93 00 <4d> 8b 3f 49 83 c7 2c 4c 89 f8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85
RSP: 0018:ffffc90004297958 EFLAGS: 00000046
RAX: 1ffff11009607551 RBX: ffff88804b039f80 RCX: 034032dd38fc5300
RDX: 0000000000000000 RSI: ffffffff8be33660 RDI: ffffffff8be33620
RBP: dffffc0000000000 R08: ffffffff8fa38a37 R09: 1ffffffff1f47146
R10: dffffc0000000000 R11: fffffbfff1f47147 R12: 1ffff11009607575
R13: 00000000000045c6 R14: ffff88804b03aba8 R15: ffff88804b03aa88
FS:  000055556fbec500(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c43273f CR3: 0000000106594000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __schedule+0x473/0x4cc0
 schedule+0x165/0x360
 do_nanosleep+0x1c7/0x600
 hrtimer_nanosleep+0x169/0x360
 __se_sys_clock_nanosleep+0x2f1/0x380
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1276bc14a5
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007ffec40ca830 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00000000000001ab RCX: 00007f1276bc14a5
RDX: 00007ffec40ca870 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffec40ca8dc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 0000000000033dc2 R15: 00007ffec40ca930
 </TASK>
