INFO: task syz.8.626:6812 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.8.626 state:D stack:0 pid:6812 tgid:6811 ppid:6449 task_flags:0x40044c flags:0x00000018 Call trace: __switch_to+0x584/0xb20 arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1eec/0x33a4 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xac/0x27c kernel/sched/core.c:7026 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:1454 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+0xbc/0xbbc mm/mmap.c:1263 __mmput+0x10c/0x530 kernel/fork.c:1133 mmput+0x70/0xac kernel/fork.c:1156 exit_mm+0x158/0x258 kernel/exit.c:582 do_exit+0x788/0x2378 kernel/exit.c:954 do_group_exit+0x1d4/0x2ac kernel/exit.c:1107 get_signal+0x1440/0x1554 kernel/signal.c:3034 arch_do_signal_or_restart+0x23c/0x4d98 arch/arm64/kernel/signal.c:1619 exit_to_user_mode_loop+0x7c/0x178 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline] el0_svc+0x170/0x234 arch/arm64/kernel/entry-common.c:747 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffff800087957348 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 3 locks held by kworker/u4:4/51: 2 locks held by getty/3196: #0: 83f0000011c328a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 58ff80008c6db2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 1 lock held by sshd-session/3323: 2 locks held by syz-executor/3324: 3 locks held by kworker/u4:3/3712: 2 locks held by kworker/u4:0/3914: 3 locks held by kworker/u4:1/4356: 3 locks held by kworker/u4:7/5028: 3 locks held by kworker/u4:10/5375: 2 locks held by kworker/u4:12/5878: #0: 9bf000000cc26948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3237 #1: ffff80008ee57c88 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3237 3 locks held by kworker/u4:6/6303: 3 locks held by kworker/u4:9/6427: 3 locks held by kworker/u4:11/6452: 3 locks held by kworker/u4:14/6604: 2 locks held by syz.7.624/6803: 2 locks held by syz-executor/6836: 4 locks held by dhcpcd-run-hook/6966: ============================================= INFO: task syz.8.626:6812 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.8.626 state:D stack:0 pid:6812 tgid:6811 ppid:6449 task_flags:0x40044c flags:0x00000018 Call trace: __switch_to+0x584/0xb20 arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1eec/0x33a4 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xac/0x27c kernel/sched/core.c:7026 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:1454 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+0xbc/0xbbc mm/mmap.c:1263 __mmput+0x10c/0x530 kernel/fork.c:1133 mmput+0x70/0xac kernel/fork.c:1156 exit_mm+0x158/0x258 kernel/exit.c:582 do_exit+0x788/0x2378 kernel/exit.c:954 do_group_exit+0x1d4/0x2ac kernel/exit.c:1107 get_signal+0x1440/0x1554 kernel/signal.c:3034 arch_do_signal_or_restart+0x23c/0x4d98 arch/arm64/kernel/signal.c:1619 exit_to_user_mode_loop+0x7c/0x178 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline] el0_svc+0x170/0x234 arch/arm64/kernel/entry-common.c:747 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffff800087957348 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 2 locks held by getty/3196: #0: 83f0000011c328a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 58ff80008c6db2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 3 locks held by kworker/u4:3/3712: 3 locks held by kworker/u4:1/4356: 3 locks held by kworker/u4:7/5028: 3 locks held by kworker/u4:8/5343: 3 locks held by kworker/u4:10/5375: 2 locks held by kworker/u4:11/6452: #0: 9bf000000cc26948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3237 #1: ffff80008e3c7c88 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3237 3 locks held by kworker/u4:13/6468: #0: fff0000072d6bd58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:638 [inline] #0: fff0000072d6bd58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1546 [inline] #0: fff0000072d6bd58 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1868 [inline] #0: fff0000072d6bd58 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2f0/0x33a4 kernel/sched/core.c:6833 #1: fff0000072d57588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x6c/0x6e8 kernel/sched/psi.c:933 #2: fff0000072d58e98 (&base->lock){-.-.}-{2:2}, at: lock_timer_base kernel/time/timer.c:1004 [inline] #2: fff0000072d58e98 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x5c8/0xe7c kernel/time/timer.c:1085 2 locks held by syz.7.624/6803: 2 locks held by syz-executor/6824: 2 locks held by syz-executor/6836: 3 locks held by dhcpcd-run-hook/6969: 2 locks held by modprobe/6970: =============================================