INFO: task syz.3.1167:16339 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1167      state:D stack:26264 pid:16339 tgid:16337 ppid:15975  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 fdget_pos+0x246/0x320
 ksys_write+0x79/0x270
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f08bcf9ce59
RSP: 002b:00007f08bddb2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f08bd216090 RCX: 00007f08bcf9ce59
RDX: 0000000000000028 RSI: 0000200000000200 RDI: 0000000000000008
RBP: 00007f08bd032e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f08bd216128 R14: 00007f08bd216090 R15: 00007ffe13314968
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 18245 Comm: syz.9.1397 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: 0033:0x7fca338541c0
Code: 49 8b 47 10 48 39 f0 72 76 48 63 cd 48 01 c1 49 39 4f 08 72 54 8d 4d ff 85 ed 74 3b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <48> 39 f0 72 1b 4d 8b 07 49 89 c1 49 29 f1 47 0f b6 0c 08 45 84 c9
RSP: 002b:00007fca34876470 EFLAGS: 00000206
RAX: 0000000000faae9e RBX: 00007fca34876530 RCX: 0000000000000003
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007fca348765d0
RBP: 0000000000000102 R08: 00007fca29600000 R09: 0000000000000000
R10: 0000000000000000 R11: 00007fca34876540 R12: 0000000000000001
R13: 00007fca33a52aa0 R14: 0000000000000000 R15: 00007fca348765d0
FS:  00007fca348776c0 GS:  0000000000000000
