INFO: task syz.2.3658:20495 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.3658      state:D stack:25608 pid:20495 tgid:20495 ppid:18793  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7531
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x7c4/0x15a0 kernel/locking/mutex.c:821
 tun_detach drivers/net/tun.c:654 [inline]
 tun_chr_close+0x3e/0x1c0 drivers/net/tun.c:3608
 __fput+0x408/0xa40 fs/file_table.c:512
 fput_close_sync+0x11f/0x240 fs/file_table.c:618
 filp_close_sync+0x6e/0xa0 fs/open.c:1573
 __range_close fs/file.c:919 [inline]
 __do_sys_close_range fs/file.c:1003 [inline]
 __se_sys_close_range+0xa77/0xef0 fs/file.c:954
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2ea0b9fb19
RSP: 002b:00007ffe3cdb38b8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007f2ea0e27da0 RCX: 00007f2ea0b9fb19
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f2ea0e27da0 R08: 00007f2ea0e26218 R09: 0000000000000000
R10: 000000000003fcb0 R11: 0000000000000246 R12: 0000000000085624
R13: 00007f2ea0e2609c R14: 00000000000853ef R15: 00007f2ea0e26090
 </TASK>

Showing all locks held in the system:
locks held by kthreadd/2: 2, last CPU#1:
 #0: ffffffff9019ab10 (