INFO: task syz.7.2637:18870 blocked for more than 143 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.2637      state:D stack:27592 pid:18870 tgid:18870 ppid:12306  task_flags:0x40044c flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5248 [inline]
 __schedule+0x1139/0x6150 kernel/sched/core.c:6855
 __schedule_loop kernel/sched/core.c:6937 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6952
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7009
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0xcf8/0x1b10 kernel/locking/mutex.c:776
 tun_detach drivers/net/tun.c:634 [inline]
 tun_chr_close+0x38/0x230 drivers/net/tun.c:3436
 __fput+0x402/0xb70 fs/file_table.c:468
 task_work_run+0x150/0x240 kernel/task_work.c:233