INFO: task syz.6.181:4875 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.6.181 state:D stack:0 pid:4875 tgid:4871 ppid:4322 task_flags:0x40044c flags:0x00000010 Call trace: __switch_to+0x584/0xb20 arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1eec/0x33a4 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xac/0x27c kernel/sched/core.c:7058 schedule_timeout+0x5c/0x1e4 kernel/time/sleep_timeout.c:75 do_wait_for_common+0x28c/0x444 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:1444 synchronize_srcu+0x3cc/0x4f0 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:402 [inline] exit_mmap+0xb8/0xbb8 mm/mmap.c:1263 __mmput+0x10c/0x528 kernel/fork.c:1130 mmput+0x70/0xac kernel/fork.c:1152 exit_mm+0x158/0x258 kernel/exit.c:582 do_exit+0x788/0x2378 kernel/exit.c:949 do_group_exit+0x1d4/0x2ac kernel/exit.c:1102 get_signal+0x1440/0x1554 kernel/signal.c:3034 do_signal+0x180/0x4dd0 arch/arm64/kernel/signal.c:1618 do_notify_resume+0xb0/0x270 arch/arm64/kernel/entry-common.c:152 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline] el0_interrupt+0xc8/0x19c arch/arm64/kernel/entry-common.c:974 __el0_irq_handler_common+0x18/0x24 arch/arm64/kernel/entry-common.c:979 el0t_64_irq_handler+0x10/0x1c arch/arm64/kernel/entry-common.c:984 el0t_64_irq+0x198/0x19c arch/arm64/kernel/entry.S:597 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffff800087876d18 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 3 locks held by kworker/u4:4/49: 1 lock held by syslogd/3114: 1 lock held by dhcpcd/3155: 2 locks held by getty/3185: #0: 3bf0000011d0e8a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 77ff80008c5cb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 2 locks held by syz-executor/3317: 3 locks held by kworker/u4:1/3624: 3 locks held by kworker/u4:9/3747: 3 locks held by kworker/u4:2/4046: 3 locks held by kworker/u4:10/4065: 2 locks held by kworker/u4:11/4201: #0: f8f000000cc20948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3210 #1: ffff80008e9b7c78 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3210 2 locks held by syz.5.180/4869: 3 locks held by kworker/u4:3/4888: 2 locks held by kworker/u4:7/4924: 3 locks held by kworker/u4:14/4977: 1 lock held by modprobe/5045: ============================================= INFO: task syz.6.181:4875 blocked for more than 451 seconds. Not tainted syzkaller #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.6.181 state:D stack:0 pid:4875 tgid:4871 ppid:4322 task_flags:0x40044c flags:0x00000010 Call trace: __switch_to+0x584/0xb20 arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1eec/0x33a4 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xac/0x27c kernel/sched/core.c:7058 schedule_timeout+0x5c/0x1e4 kernel/time/sleep_timeout.c:75 do_wait_for_common+0x28c/0x444 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:1444 synchronize_srcu+0x3cc/0x4f0 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:402 [inline] exit_mmap+0xb8/0xbb8 mm/mmap.c:1263 __mmput+0x10c/0x528 kernel/fork.c:1130 mmput+0x70/0xac kernel/fork.c:1152 exit_mm+0x158/0x258 kernel/exit.c:582 do_exit+0x788/0x2378 kernel/exit.c:949 do_group_exit+0x1d4/0x2ac kernel/exit.c:1102 get_signal+0x1440/0x1554 kernel/signal.c:3034 do_signal+0x180/0x4dd0 arch/arm64/kernel/signal.c:1618 do_notify_resume+0xb0/0x270 arch/arm64/kernel/entry-common.c:152 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline] el0_interrupt+0xc8/0x19c arch/arm64/kernel/entry-common.c:974 __el0_irq_handler_common+0x18/0x24 arch/arm64/kernel/entry-common.c:979 el0t_64_irq_handler+0x10/0x1c arch/arm64/kernel/entry-common.c:984 el0t_64_irq+0x198/0x19c arch/arm64/kernel/entry.S:597 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffff800087876d18 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 2 locks held by getty/3185: #0: 3bf0000011d0e8a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 77ff80008c5cb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 3 locks held by kworker/u4:0/3228: 3 locks held by kworker/u4:6/3371: 3 locks held by kworker/u4:8/3448: 3 locks held by kworker/u4:11/4201: 3 locks held by kworker/u4:12/4267: 2 locks held by syz.5.180/4869: 3 locks held by kworker/u4:7/4924: 2 locks held by kworker/u4:13/4969: =============================================