INFO: task syz-executor:10113 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:10113 tgid:10113 ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 wb_wait_for_completion+0x15f/0x260
 __writeback_inodes_sb_nr+0x1f6/0x250
 sync_filesystem+0xa3/0x230
 generic_shutdown_super+0x6f/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: 0033:0x7fdbeaf8ff17
RSP: 002b:00007ffe770ff158 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fdbeb011c05 RCX: 00007fdbeaf8ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe770ff210
RBP: 00007ffe770ff210 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe771002a0
R13: 00007fdbeb011c05 R14: 0000000000033f11 R15: 00007ffe771002e0
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5832 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:rw_verify_area+0x0/0x4d0
Code: f7 4c 89 fe 4c 89 e2 4c 89 e9 5b 41 5c 41 5d 41 5e 41 5f 5d e9 81 fc ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 49 89 ce 49
RSP: 0018:ffffc900030afc98 EFLAGS: 00000246
RAX: ffffffff8233780b RBX: 00007ffffffff000 RCX: 0000000000000004
RDX: 0000000000000000 RSI: ffff888027860400 RDI: 0000000000000000
RBP: ffffc900030afe10 R08: ffff88810a775003 R09: 1ffff110214eea00
R10: dffffc0000000000 R11: ffffed10214eea01 R12: 00007ffd3507512c
R13: 0000000000000004 R14: 1ffff92000615fa0 R15: ffff888027860400
FS:  000055557be77500(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000279e0000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 vfs_read+0x154/0xa30
 ksys_read+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9cc558d5bd
Code: a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b5 e8 a8 48 00 00 0f 1f 84 00 00 00 00 00 80 3d a1 af 1f 00 00 74 17 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec
RSP: 002b:00007ffd35075118 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9cc558d5bd
RDX: 0000000000000004 RSI: 00007ffd3507512c RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000031cdcf41 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd35075540
R13: 0000000000000004 R14: 00007ffd3507512c R15: 00007ffd350751c0
 </TASK>
