INFO: task syz.2.1738:25538 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1738      state:D stack:23448 pid:25538 tgid:25537 ppid:23203  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x360
 cgroup_lock_and_drain_offline+0x51a/0x650
 cgroup1_get_tree+0x9d/0x890
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x319/0xdc0
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9d3a79ce59
RSP: 002b:00007f9d3b698028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f9d3aa15fa0 RCX: 00007f9d3a79ce59
RDX: 0000200000000180 RSI: 0000200000000140 RDI: 0000000000000000
RBP: 00007f9d3a832e6f R08: 00002000000001c0 R09: 0000000000000000
R10: 0000000000808018 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9d3aa16038 R14: 00007f9d3aa15fa0 R15: 00007ffe204751f8
 </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+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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 27 Comm: kworker/u10:0 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
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:trace_workqueue_execute_start+0x3/0x1d0
Code: 90 90 90 90 90 90 90 f3 0f 1e fa 90 0f 0b 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 <41> 56 41 54 53 48 89 fb e8 d0 c2 37 00 0f 1f 44 00 00 e8 c6 c2 37
RSP: 0018:ffffc90000a27ae8 EFLAGS: 00000296
RAX: 5de2f674c9c49e00 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8c2a8c60 RDI: ffff8881bbf4ac00
RBP: ffffc90000a27ce8 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff20655df R12: ffff888160421418
R13: dffffc0000000000 R14: ffffffff818e5df0 R15: ffff8881bbf4ac00
FS:  0000000000000000(0000) GS:ffff8882a922d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc7cc98ac8 CR3: 00000001a83e8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 process_scheduled_works+0xa64/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
