INFO: task syz-executor.0:3641 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:3641 tgid:3639 ppid:3527 task_flags:0x400140 flags:0x00000011 Call trace: __switch_to+0x208/0x4f0 arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5260 [inline] __schedule+0xcfc/0x2fec kernel/sched/core.c:6867 __schedule_loop kernel/sched/core.c:6949 [inline] schedule+0xd0/0x344 kernel/sched/core.c:6964 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7021 __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:706 __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 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0x194/0x1c8 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 pr/ttyAMA-1/32: 1 lock held by khungtaskd/33: #0: ffff800087562ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x18/0x1c4 kernel/locking/lockdep.c:6769 2 locks held by klogd/3125: 2 locks held by getty/3259: #0: ffff00001922a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80008d8fb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e8/0xdd0 drivers/tty/n_tty.c:2211 1 lock held by syz-executor.0/3641: #0: ffff000015371358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x104/0x510 block/bdev.c:1145 1 lock held by udevd/3644: #0: ffff000015371358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 1 lock held by syz-executor.0/3745: #0: ffff000015371358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 1 lock held by syz-executor.0/3828: #0: ffff000015371358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 1 lock held by syz-executor.0/3904: #0: ffff000015371358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 ============================================= INFO: task syz-executor.0:3641 blocked for more than 450 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:3641 tgid:3639 ppid:3527 task_flags:0x400140 flags:0x00000011 Call trace: __switch_to+0x208/0x4f0 arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5260 [inline] __schedule+0xcfc/0x2fec kernel/sched/core.c:6867 __schedule_loop kernel/sched/core.c:6949 [inline] schedule+0xd0/0x344 kernel/sched/core.c:6964 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7021 __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:706 __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 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0x194/0x1c8 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: 2 locks held by pr/ttyAMA-1/32: 1 lock held by khungtaskd/33: #0: ffff800087562ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x18/0x1c4 kernel/locking/lockdep.c:6769 2 locks held by getty/3259: #0: ffff00001922a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80008d8fb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e8/0xdd0 drivers/tty/n_tty.c:2211 1 lock held by syz-executor.0/3641: #0: ffff000015371358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x104/0x510 block/bdev.c:1145 1 lock held by udevd/3644: #0: ffff000015371358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 1 lock held by syz-executor.0/3745: #0: ffff000015371358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 1 lock held by syz-executor.0/3828: #0: ffff000015371358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 1 lock held by syz-executor.0/3904: #0: ffff000015371358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2c4/0xa84 block/bdev.c:962 =============================================