INFO: task syz-executor:18070 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:18070 tgid:18070 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: 0033:0x7f238738ff17
RSP: 002b:00007ffc1bf9e538 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f2387411c05 RCX: 00007f238738ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc1bf9e5f0
RBP: 00007ffc1bf9e5f0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc1bf9f680
R13: 00007f2387411c05 R14: 000000000007f5ee R15: 00007ffc1bf9f6c0
 </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: 22368 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:asm_sysvec_call_function_single+0x0/0x20
Code: e6 56 79 0a e9 e1 05 00 00 90 f3 0f 1e fa 0f 1f 00 fc 6a ff e8 91 04 00 00 48 89 c4 48 89 e7 e8 f6 55 79 0a e9 c1 05 00 00 90 <f3> 0f 1e fa 0f 1f 00 fc 6a ff e8 71 04 00 00 48 89 c4 48 89 e7 e8
RSP: 0000:ffffc90001bd7b58 EFLAGS: 00000046
RAX: ffffffff820fecbf RBX: 00007f7157ce6000 RCX: ffff888106145640
RDX: 0000000000000000 RSI: 0000000000000043 RDI: 0000000000000043
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90001bd7d0c R11: fffff5200037afaa R12: 0000000110ac2067
R13: dffffc0000000000 R14: ffff88810f1025f0 R15: 0000000000000043
FS:  0000000000000000(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7157ce6040 CR3: 000000012f032000 CR4: 00000000000006f0
Call Trace:
 <TASK>
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70
Code: 8b 3d c4 49 fe 0b 48 89 de 5b e9 73 98 58 00 cc cc cc 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 08 50 a0 92 65 8b 15 e8 a4 e0 10 81 e2 00 01 ff 00
RSP: 0000:ffffc90001bd7b80 EFLAGS: 00000246
 ___pte_offset_map+0x1cf/0x250
 pte_offset_map_rw_nolock+0x3b/0x160
 __handle_mm_fault+0xb3a/0x5440
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0xa81/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f7157ba6e04
Code: 66 0f 1f 44 00 00 48 8b 38 8b 50 08 4c 01 ff 48 83 fa 26 74 0a 48 83 fa 08 0f 85 1b 0a 00 00 48 8b 50 10 48 83 c0 18 4c 01 fa <48> 89 17 48 39 d8 72 d4 4c 8b b1 e8 01 00 00 49 01 f0 4d 85 f6 0f
RSP: 002b:00007ffd4863f040 EFLAGS: 00010202
RAX: 00007f7157a10b48 RBX: 00007f7157a48a38 RCX: 00007f7157d88720
RDX: 00007f7157bf9ea8 RSI: 00007f7157a003c0 RDI: 00007f7157ce6040
RBP: 00007f7157d88720 R08: 0000000000048a68 R09: 00007f7157a48e28
R10: 0000000070000025 R11: 00007f7157a003a0 R12: 00007ffd4863f080
R13: 00007ffd4863f208 R14: 00007ffd4863f1a0 R15: 00007f7157a00000
 </TASK>
