INFO: task syz-executor:6464 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:18856 pid:6464  tgid:6464  ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 v9fs_evict_inode+0x170/0x320
 evict+0x504/0x9c0
 __dentry_kill+0x209/0x660
 dput+0x19f/0x2b0
 shrink_dcache_for_umount+0xa0/0x170
 generic_shutdown_super+0x67/0x2c0
 kill_anon_super+0x3b/0x70
 v9fs_kill_super+0x4c/0x90
 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: 0033:0x7fe7e758ff17
RSP: 002b:00007ffe96b94758 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fe7e7611c05 RCX: 00007fe7e758ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe96b94810
RBP: 00007ffe96b94810 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe96b958a0
R13: 00007fe7e7611c05 R14: 00000000000324e2 R15: 00007ffe96b958e0
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u10:1/32:
 #0: ffff888136639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
 #1: ffff888136624008 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: 
ffff888038c03fe8 (&c->btree_interior_update_lock){+.+.}-{4:4}, at: btree_interior_update_work+0x217e/0x27d0
 #3: ffff888038c03fe8 (&c->btree_interior_update_lock){+.+.}-{4:4}, at: bch2_btree_update_free+0x1a3/0x3f0
1 lock held by khungtaskd/34:
 #0: ffffffff8e139f20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5674:
 #0: ffff88810dabd0a0 (&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
1 lock held by syz-executor/6464:
 #0: ffff88811c89a0e0 (&type->s_umount_key#55){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0
3 locks held by kworker/1:9/10786:
 #0: ffff88801b7f9548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90002bffbc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff8881094fa198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20

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

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: 11587 Comm: syz.1.1158 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:kasan_check_range+0x9/0x2c0
Code: f8 04 ff 90 0f 0b cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 55 41 57 41 56 <41> 55 41 54 53 b0 01 48 85 f6 0f 84 ba 01 00 00 4c 8d 04 37 49 39
RSP: 0018:ffffc9000332e518 EFLAGS: 00000246
RAX: ffffffff99afd8d7 RBX: 0000000000000017 RCX: ffffffff81a0512c
RDX: 0000000000000000 RSI: 0000000000000017 RDI: ffffc9000332e5e0
RBP: ffffc9000332e690 R08: 3a343736352f7974 R09: 7465672079622064
R10: 20796220646c6568 R11: 20736b636f6c2032 R12: ffffffff81a0512c
R13: ffffffff99afd8c0 R14: ffffc9000332e5e0 R15: ffffffff99afd8c0
FS:  00007fc6a483d6c0(0000) GS:ffff8880b8618000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ebd81c68c8 CR3: 000000011d8a0000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __asan_memcpy+0x29/0x70
 record_print_text+0x26c/0x420
 printk_get_next_message+0x26d/0x7b0
 console_flush_all+0x4ca/0xc40
 console_unlock+0xc4/0x270
 vprintk_emit+0x5b7/0x7a0
 _printk+0xcf/0x120
 bch2_print_string_as_lines+0x135/0x250
 __bch2_fsck_err+0xb99/0x1000
 bch2_check_snapshots+0x1058/0x1fe0
 __bch2_run_recovery_passes+0x3bd/0x1060
 bch2_run_recovery_passes+0x184/0x210
 bch2_fs_recovery+0x2690/0x3a50
 bch2_fs_start+0xaaf/0xda0
 bch2_fs_get_tree+0xb39/0x1520
 vfs_get_tree+0x92/0x2b0
 do_new_mount+0x2a2/0x9e0
 __se_sys_mount+0x317/0x410
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc6a399038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc6a483ce68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc6a483cef0 RCX: 00007fc6a399038a
RDX: 00002000000058c0 RSI: 0000200000005900 RDI: 00007fc6a483ceb0
RBP: 00002000000058c0 R08: 00007fc6a483cef0 R09: 0000000000010000
R10: 0000000000010000 R11: 0000000000000246 R12: 0000200000005900
R13: 00007fc6a483ceb0 R14: 00000000000058b4 R15: 0000200000000240
 </TASK>
