INFO: task udevd:3143 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:0 pid:3143 tgid:3143 ppid:1 task_flags:0x400140 flags:0x00000010 Call trace: __switch_to+0x208/0x4f0 arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5248 [inline] __schedule+0xd1c/0x3278 kernel/sched/core.c:6855 __schedule_loop kernel/sched/core.c:6937 [inline] schedule+0xd0/0x344 kernel/sched/core.c:6952 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7009 __mutex_lock_common kernel/locking/mutex.c:692 [inline] __mutex_lock+0x72c/0xffc kernel/locking/mutex.c:776 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:828 bdev_open+0x2c4/0xa84 block/bdev.c:962 blkdev_open+0x270/0x3dc block/fops.c:702 do_dentry_open+0x3f4/0x10e4 fs/open.c:962 vfs_open+0x5c/0x2fc fs/open.c:1094 do_open fs/namei.c:4628 [inline] path_openat+0x17f0/0x28cc fs/namei.c:4787 do_filp_open+0x184/0x360 fs/namei.c:4814 do_sys_openat2+0xe0/0x180 fs/open.c:1430 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __arm64_sys_openat+0x12c/0x1bc fs/open.c:1447 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x2b0 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz-executor.0:3635 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:3635 tgid:3632 ppid:3518 task_flags:0x400140 flags:0x00000019 Call trace: __switch_to+0x208/0x4f0 arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5248 [inline] __schedule+0xd1c/0x3278 kernel/sched/core.c:6855 __schedule_loop kernel/sched/core.c:6937 [inline] schedule+0xd0/0x344 kernel/sched/core.c:6952 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7009 __mutex_lock_common kernel/locking/mutex.c:692 [inline] __mutex_lock+0x72c/0xffc kernel/locking/mutex.c:776 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:828 bdev_release+0x104/0x510 block/bdev.c:1145 blkdev_release+0x14/0x24 block/fops.c:710 __fput+0x2c8/0x954 fs/file_table.c:468 ____fput+0x14/0x20 fs/file_table.c:496 task_work_run+0x128/0x210 kernel/task_work.c:233 get_signal+0x174/0x1ba8 kernel/signal.c:2807 arch_do_signal_or_restart+0x1f4/0x694 arch/arm64/kernel/signal.c:1619 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] exit_to_user_mode_loop+0x140/0x1c8 kernel/entry/common.c:75 __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_svc+0x26c/0x2b0 arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 1 lock held by khungtaskd/32: #0: ffff8000874b3a60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x18/0x1c4 kernel/locking/lockdep.c:6769 1 lock held by syslogd/3128: #0: ffff00006a07afd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:639 [inline] #0: ffff00006a07afd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1556 [inline] #0: ffff00006a07afd8 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1883 [inline] #0: ffff00006a07afd8 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x344/0x3278 kernel/sched/core.c:6760 1 lock held by klogd/3132: 1 lock held by udevd/3143: #0: ffff000014af8358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 2 locks held by getty/3267: #0: ffff0000188a60a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80008d83b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e8/0xdc0 drivers/tty/n_tty.c:2222 1 lock held by syz-executor.0/3635: #0: ffff000014af8358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x104/0x510 block/bdev.c:1145 1 lock held by udevd/3637: #0: ffff000014af8358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 1 lock held by syz-executor.0/3747: #0: ffff000014af8358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 1 lock held by syz-executor.0/3823: #0: ffff000014af8358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 =============================================