INFO: task syz-executor:11454 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:11454 tgid:11454 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: 0033:0x7f30d3b8ff17
RSP: 002b:00007ffd6b2e2238 EFLAGS: 00000246
 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f30d3c11c05 RCX: 00007f30d3b8ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd6b2e22f0
RBP: 00007ffd6b2e22f0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd6b2e3380
R13: 00007f30d3c11c05 R14: 0000000000065465 R15: 00007ffd6b2e33c0
 </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: 16060 Comm: syz.0.1889 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:mas_empty_area_rev+0xd4d/0x1ce0
Code: 48 8b 8c 24 a0 00 00 00 4c 8d 3c c1 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 1b 69 b2 f6 4d 8b 3f e8 73 d3 08 00 <89> c5 31 ff 89 c6 e8 f8 03 4f f6 85 ed 74 68 4c 89 e9 4d 8d 6e 40
RSP: 0018:ffffc90004007830 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc900040079a0 RCX: ffff88810f5b4450
RDX: ffff88804910b980 RSI: 0000000000000003 RDI: 0000000000000002
RBP: ffffc900040079a8 R08: ffff88804910b980 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: 00007f59b91e1000
R13: dffffc0000000000 R14: ffff88802366e100 R15: ffff88802836d40c
FS:  000055558f7cf500(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f59b91fffc8 CR3: 000000012b5c4000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 unmapped_area_topdown+0x211/0x590
 vm_unmapped_area+0x69/0x230
 arch_get_unmapped_area_topdown+0x97f/0xbc0
 __get_unmapped_area+0x2a8/0x450
 do_mmap+0x4ab/0x10d0
 vm_mmap_pgoff+0x2a6/0x4d0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59b838ec23
Code: f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 89 ca 41 f7 c1 ff 0f 00 00 75 14 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 25 c3 0f 1f 40 00 48 c7 c0 a8 ff ff ff 64 c7
RSP: 002b:00007ffe7fb212a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f59b6df76c0 RCX: 00007f59b838ec23
RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000020022 R11: 0000000000000246 R12: 00007ffe7fb21400
R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
 </TASK>
