INFO: task syz.0.17:4479 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.17 state:D stack:0 pid:4479 ppid:4453 flags:0x00000001 Call trace: __switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5244 [inline] __schedule+0xddc/0x1b18 kernel/sched/core.c:6561 schedule+0xc4/0x170 kernel/sched/core.c:6637 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696 __mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 blkdev_put+0xe8/0x6c8 block/bdev.c:930 blkdev_close+0x50/0x90 block/fops.c:514 __fput+0x1bc/0x7c0 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x1ec/0x270 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2038/0x2b28 arch/arm64/kernel/signal.c:1137 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x98/0x138 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 INFO: task syz.0.17:4480 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.17 state:D stack:0 pid:4480 ppid:4453 flags:0x00000009 Call trace: __switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5244 [inline] __schedule+0xddc/0x1b18 kernel/sched/core.c:6561 schedule+0xc4/0x170 kernel/sched/core.c:6637 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6696 __mutex_lock_common+0xad4/0x1f38 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 blkdev_put+0xe8/0x6c8 block/bdev.c:930 blkdev_close+0x50/0x90 block/fops.c:514 __fput+0x1bc/0x7c0 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x1ec/0x270 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2038/0x2b28 arch/arm64/kernel/signal.c:1137 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x98/0x138 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffff800015227d70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffff800015228590 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517 3 locks held by kworker/1:1/24: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265 #1: ffff80001c8f7c20 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267 #2: ffff0000cce43240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x1c8/0x263c drivers/net/netdevsim/fib.c:1491 1 lock held by khungtaskd/28: #0: ffff800015227400 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349 2 locks held by getty/4080: #0: ffff0000d638e098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80001ce332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2ec/0xf9c drivers/tty/n_tty.c:2198 1 lock held by udevd/4478: #0: ffff0000cee054c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8cc block/bdev.c:832 1 lock held by syz.0.17/4479: #0: ffff0000cee054c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.0.17/4480: #0: ffff0000cee054c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by udevd/4484: #0: ffff0000cee614c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8cc block/bdev.c:832 1 lock held by udevd/4485: #0: ffff0000cee664c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8cc block/bdev.c:832 1 lock held by syz.1.18/4501: #0: ffff0000cee614c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.1.18/4502: #0: ffff0000cee614c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.2.19/4521: #0: ffff0000cee664c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.2.19/4522: #0: ffff0000cee664c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by udevd/4526: #0: ffff0000cef784c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8cc block/bdev.c:832 1 lock held by udevd/4527: #0: ffff0000cef634c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8cc block/bdev.c:832 1 lock held by syz.3.20/4543: #0: ffff0000cef634c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.3.20/4544: #0: ffff0000cef634c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by udevd/4554: #0: ffff0000cef7d4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8cc block/bdev.c:832 1 lock held by syz.4.21/4580: #0: ffff0000cef784c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.4.21/4581: #0: ffff0000cef784c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.5.22/4610: #0: ffff0000cef7d4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.5.22/4611: #0: ffff0000cef7d4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by udevd/4614: #0: ffff0000cf06f4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8cc block/bdev.c:832 1 lock held by udevd/4617: #0: ffff0000cf06a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8cc block/bdev.c:832 1 lock held by syz.6.23/4642: #0: ffff0000cf06a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.6.23/4643: #0: ffff0000cf06a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.7.24/4672: #0: ffff0000cf06f4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.7.24/4673: #0: ffff0000cf06f4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by udevd/4683: #0: ffff0000cf10c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8cc block/bdev.c:832 1 lock held by udevd/4684: #0: ffff0000cf1294c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8cc block/bdev.c:832 1 lock held by syz.8.25/4710: #0: ffff0000cf10c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.8.25/4711: #0: ffff0000cf10c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.9.26/4740: #0: ffff0000cf1294c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 1 lock held by syz.9.26/4741: #0: ffff0000cf1294c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6c8 block/bdev.c:930 =============================================