INFO: task syz.1.29:3606 blocked for more than 431 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.29        state:D stack:0     pid:3606  tgid:3606  ppid:3379   task_flags:0x40044c flags:0x00000019
Call trace:
 __switch_to+0x20c/0x520 arch/arm64/kernel/process.c:810 (T)
 context_switch kernel/sched/core.c:5504 [inline]
 __schedule+0xf98/0x3500 kernel/sched/core.c:7228
 __schedule_loop kernel/sched/core.c:7307 [inline]
 schedule+0xcc/0x340 kernel/sched/core.c:7322
 schedule_timeout+0x170/0x224 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:100 [inline]
 __wait_for_common+0x1c0/0x3e8 kernel/sched/completion.c:121
 wait_for_common kernel/sched/completion.c:132 [inline]
 wait_for_completion+0x20/0x38 kernel/sched/completion.c:153
 rcu_barrier kernel/rcu/tree.c:3925 [inline]
 rcu_barrier+0x298/0x5c0 kernel/rcu/tree.c:3846
 netdev_run_todo+0x250/0xf54 net/core/dev.c:11710
 rtnl_unlock+0x10/0x1c net/core/rtnetlink.c:157
 tun_detach drivers/net/tun.c:647 [inline]
 tun_chr_close+0x90/0x1a8 drivers/net/tun.c:3506
 __fput+0x2d0/0x980 fs/file_table.c:512
 ____fput+0x14/0x20 fs/file_table.c:540
 task_work_run+0x134/0x238 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6a0/0x2158 kernel/exit.c:1004
 do_group_exit+0xa4/0x208 kernel/exit.c:1147
 get_signal+0x1b20/0x1f00 kernel/signal.c:3038
 arch_do_signal_or_restart+0x168/0x700 arch/arm64/kernel/signal.c:1665
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x13c/0x1c8 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 arm64_syscall_exit_to_user_mode arch/arm64/kernel/entry-common.c:88 [inline]
 el0_svc+0x244/0x2a4 arch/arm64/kernel/entry-common.c:737
 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:755
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
INFO: lockdep is turned off.