INFO: task syz.8.229:5523 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.8.229 state:D stack:0 pid:5523 tgid:5523 ppid:5132 task_flags:0x40004c 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+0x288/0x2ac kernel/exit.c:1102 __do_sys_exit_group kernel/exit.c:1113 [inline] __se_sys_exit_group kernel/exit.c:1111 [inline] __arm64_sys_exit_group+0x40/0x48 kernel/exit.c:1111 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x90/0x2b4 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x180/0x2f4 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x58/0x74 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x164 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 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: ffff800087806858 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 2 locks held by kworker/u4:6/2105: 2 locks held by getty/3182: #0: 10f00000121868a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 15ff80008c54b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 2 locks held by syz-executor/3311: 3 locks held by kworker/u4:9/3591: 3 locks held by kworker/u4:3/4131: 3 locks held by kworker/u4:11/4212: 3 locks held by kworker/u4:2/5296: 2 locks held by kworker/u4:12/5298: #0: 98f000000cc20948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3210 #1: ffff80008fd47c78 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3210 2 locks held by kworker/u4:15/5345: #0: 98f000000cc20948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3210 #1: ffff80008ee37c78 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3210 2 locks held by syz.9.228/5519: 3 locks held by kworker/u4:1/5524: #0: fff0000072d80d18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:636 [inline] #0: fff0000072d80d18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1519 [inline] #0: fff0000072d80d18 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1841 [inline] #0: fff0000072d80d18 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2f0/0x33a4 kernel/sched/core.c:6865 #1: fff0000072d6c548 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x6c/0x6e8 kernel/sched/psi.c:933 #2: fff0000072d6de58 (&base->lock){-.-.}-{2:2}, at: lock_timer_base kernel/time/timer.c:1004 [inline] #2: fff0000072d6de58 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x5c8/0xe7c kernel/time/timer.c:1085 2 locks held by modprobe/5686: 1 lock held by modprobe/5687: 1 lock held by dhcpcd-run-hook/5688: =============================================