INFO: task syz.8.137:5185 blocked for more than 430 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.137       state:D stack:0     pid:5185  tgid:5182  ppid:4590   task_flags:0x40054c flags:0x00000011
Call trace:
 __switch_to+0x584/0xb00 arch/arm64/kernel/process.c:742 (T)
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x1da4/0x3678 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0xac/0x27c kernel/sched/core.c:7008
 schedule_timeout+0x68/0x1ec kernel/time/sleep_timeout.c:75
 do_wait_for_common+0x28c/0x440 kernel/sched/completion.c:100
 __wait_for_common kernel/sched/completion.c:121 [inline]
 wait_for_common kernel/sched/completion.c:132 [inline]
 wait_for_completion+0x44/0x5c kernel/sched/completion.c:153
 __synchronize_srcu+0x2a4/0x320 kernel/rcu/srcutree.c:1520
 synchronize_srcu+0x3d0/0x4f8 kernel/rcu/srcutree.c:-1
 mn_hlist_release mm/mmu_notifier.c:347 [inline]
 __mmu_notifier_release+0x424/0x614 mm/mmu_notifier.c:359
 mmu_notifier_release include/linux/mmu_notifier.h:403 [inline]
 exit_mmap+0xcc/0xb84 mm/mmap.c:1284
 __mmput+0x10c/0x528 kernel/fork.c:1175
 mmput+0x70/0xa8 kernel/fork.c:1198
 exit_mm+0x158/0x248 kernel/exit.c:581
 do_exit+0x828/0x2410 kernel/exit.c:964
 do_group_exit+0x1d4/0x2ac kernel/exit.c:1118
 get_signal+0x1440/0x154c kernel/signal.c:3034
 arch_do_signal_or_restart+0x180/0x4bac arch/arm64/kernel/signal.c:1633
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x88/0x188 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 exit_to_user_mode_prepare_legacy include/linux/irq-entry-common.h:242 [inline]
 arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline]
 el0_da+0x180/0x218 arch/arm64/kernel/entry-common.c:541
 el0t_64_sync_handler+0x90/0x12c arch/arm64/kernel/entry-common.c:746
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

Showing all locks held in the system:
3 locks held by kworker/u4:0/12:
1 lock held by khungtaskd/26:
 #0: ffff800087c971f8 (rcu_read_lock){....}-{1:3}, at: __ll_sc_atomic64_fetch_or arch/arm64/include/asm/atomic_ll_sc.h:-1 [inline]
 #0: ffff800087c971f8 (rcu_read_lock){....}-{1:3}, at: arch_atomic64_fetch_or arch/arm64/include/asm/atomic.h:86 [inline]
 #0: ffff800087c971f8 (rcu_read_lock){....}-{1:3}, at: raw_atomic64_fetch_or include/linux/atomic/atomic-arch-fallback.h:3816 [inline]
 #0: ffff800087c971f8 (rcu_read_lock){....}-{1:3}, at: raw_atomic_long_fetch_or include/linux/atomic/atomic-long.h:1090 [inline]
 #0: ffff800087c971f8 (rcu_read_lock){....}-{1:3}, at: arch_test_and_set_bit include/asm-generic/bitops/atomic.h:42 [inline]
 #0: ffff800087c971f8 (rcu_read_lock){....}-{1:3}, at: test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:72 [inline]
 #0: ffff800087c971f8 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x0/0x44 kernel/sched/sched.h:3839
1 lock held by klogd/3133:
2 locks held by getty/3200:
 #0: f0f000001288a8a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: 00ff80008ca2b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x308/0x1234 drivers/tty/n_tty.c:2211
1 lock held by sshd-session/3331:
2 locks held by syz-executor/3332:
2 locks held by kworker/u4:1/3342:
 #0: 6ff000000d036548 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x7f8/0x1d94 kernel/workqueue.c:3250
 #1: ffff80008fe27ca8 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x884/0x1d94 kernel/workqueue.c:3250
3 locks held by kworker/u4:8/3434:
3 locks held by kworker/u4:3/3648:
2 locks held by kworker/u4:9/3664:
 #0: 6ff000000d036548 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x7f8/0x1d94 kernel/workqueue.c:3250
 #1: ffff8000abc97ca8 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x884/0x1d94 kernel/workqueue.c:3250
3 locks held by kworker/u4:2/3943:
3 locks held by kworker/u4:12/4102:
2 locks held by kworker/u4:14/4605:
3 locks held by kworker/u4:6/4796:
2 locks held by syz.9.136/5177:
1 lock held by syz-executor/5194:
4 locks held by modprobe/5338:

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