INFO: task syz.8.423:6299 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.8.423 state:D stack:0 pid:6299 tgid:6296 ppid:5644 task_flags:0x40044c flags:0x00000010 Call trace: __switch_to+0x5e0/0xb70 arch/arm64/kernel/process.c:810 (T) context_switch kernel/sched/core.c:5388 [inline] __schedule+0x2554/0x3828 kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0xac/0x278 kernel/sched/core.c:7283 schedule_timeout+0x68/0x1ec kernel/time/sleep_timeout.c:75 do_wait_for_common+0x270/0x428 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+0x1b4/0x1f4 kernel/rcu/srcutree.c:1496 synchronize_srcu+0x668/0x8dc kernel/rcu/srcutree.c:-1 mn_hlist_release mm/mmu_notifier.c:373 [inline] __mmu_notifier_release+0x668/0x858 mm/mmu_notifier.c:385 mmu_notifier_release include/linux/mmu_notifier.h:443 [inline] exit_mmap+0xcc/0xb64 mm/mmap.c:1282 __mmput+0x10c/0x51c kernel/fork.c:1178 mmput+0x70/0xa8 kernel/fork.c:1201 exit_mm+0x1e4/0x2f8 kernel/exit.c:582 do_exit+0x828/0x23d8 kernel/exit.c:964 do_group_exit+0x1d4/0x2ac kernel/exit.c:1119 get_signal+0x13f8/0x1504 kernel/signal.c:3037 arch_do_signal_or_restart+0x23c/0x4b50 arch/arm64/kernel/signal.c:1665 __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: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+0x184/0x238 arch/arm64/kernel/entry-common.c:741 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: __ll_sc_atomic64_fetch_or arch/arm64/include/asm/atomic_ll_sc.h:-1 [inline] #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: arch_atomic64_fetch_or arch/arm64/include/asm/atomic.h:86 [inline] #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: raw_atomic64_fetch_or include/linux/atomic/atomic-arch-fallback.h:3816 [inline] #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: raw_atomic_long_fetch_or include/linux/atomic/atomic-long.h:1090 [inline] #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: arch_test_and_set_bit include/asm-generic/bitops/atomic.h:42 [inline] #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:72 [inline] #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x0/0x44 kernel/sched/sched.h:3869 2 locks held by getty/3234: #0: 97f00000127660a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 1dff80008cb4b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x314/0x1214 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/3362: 3 locks held by kworker/u4:3/3408: 2 locks held by kworker/u4:7/3462: #0: 00f000000d036540 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x804/0x1d5c kernel/workqueue.c:3288 #1: ffff8000a39f7cb8 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x890/0x1d5c kernel/workqueue.c:3288 3 locks held by kworker/u4:2/4343: 3 locks held by kworker/u4:12/4536: 3 locks held by kworker/u4:0/4852: 2 locks held by kworker/u4:1/5541: 3 locks held by kworker/u4:9/5563: 3 locks held by kworker/u4:10/6097: 2 locks held by syz.9.422/6293: 3 locks held by kworker/u4:6/6317: 1 lock held by modprobe/6435: 2 locks held by rm/6436: =============================================