INFO: task udevd:3133 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:3133 tgid:3133 ppid:1 task_flags:0x400140 flags:0x00000008 Call trace: __switch_to+0x208/0x4ec arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5357 [inline] __schedule+0xd58/0x3180 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xd0/0x344 kernel/sched/core.c:7058 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7115 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x72c/0xffc kernel/locking/mutex.c:760 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:812 bdev_open+0x2c4/0xa84 block/bdev.c:945 blkdev_open+0x1d4/0x324 block/fops.c:691 do_dentry_open+0x6a4/0x103c fs/open.c:965 vfs_open+0x5c/0x2fc fs/open.c:1095 do_open fs/namei.c:3887 [inline] path_openat+0x1490/0x24b4 fs/namei.c:4046 do_filp_open+0x184/0x360 fs/namei.c:4073 do_sys_openat2+0xe0/0x160 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __arm64_sys_openat+0x12c/0x1bc fs/open.c:1461 __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+0x50/0x1a0 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz.3.753:6035 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.753 state:D stack:0 pid:6035 tgid:6033 ppid:3975 task_flags:0x400140 flags:0x00400011 Call trace: __switch_to+0x208/0x4ec arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5357 [inline] __schedule+0xd58/0x3180 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xd0/0x344 kernel/sched/core.c:7058 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7115 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x72c/0xffc kernel/locking/mutex.c:760 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:812 bdev_release+0x104/0x510 block/bdev.c:1128 blkdev_release+0x14/0x24 block/fops.c:699 __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:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x1d8/0x260 arch/arm64/kernel/entry-common.c:155 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_svc_compat+0x104/0x184 arch/arm64/kernel/entry-common.c:1030 el0t_32_sync_handler+0x88/0xac arch/arm64/kernel/entry-common.c:1047 el0t_32_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:601 Showing all locks held in the system: 2 locks held by pr/ttyAMA-1/32: 1 lock held by khungtaskd/33: #0: ffff800087310020 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x18/0x1c4 kernel/locking/lockdep.c:6769 1 lock held by udevd/3133: #0: ffff000014c53358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:945 2 locks held by getty/3257: #0: ffff0000181160a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80008d5eb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e8/0xdc0 drivers/tty/n_tty.c:2222 3 locks held by kworker/u8:20/3888: 2 locks held by kworker/u8:21/3891: 3 locks held by kworker/u8:29/3908: 1 lock held by udevd/5556: #0: ffff000014c53358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:945 1 lock held by syz.3.753/6035: #0: ffff000014c53358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x104/0x510 block/bdev.c:1128 =============================================