INFO: task syz.0.17:4584 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:4584 ppid:4471 flags:0x00000001 Call trace: __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5245 [inline] __schedule+0xdd0/0x1b0c kernel/sched/core.c:6562 schedule+0xc4/0x170 kernel/sched/core.c:6638 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6697 __mutex_lock_common+0xafc/0x1f60 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+0xe8/0x6bc block/bdev.c:930 blkdev_close+0x50/0x90 block/fops.c:514 __fput+0x1bc/0x7b8 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x1ec/0x278 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x1fa0/0x2aa4 arch/arm64/kernel/signal.c:1151 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+0x98/0x128 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.0.17:4585 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:4585 ppid:4471 flags:0x00000009 Call trace: __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5245 [inline] __schedule+0xdd0/0x1b0c kernel/sched/core.c:6562 schedule+0xc4/0x170 kernel/sched/core.c:6638 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6697 __mutex_lock_common+0xafc/0x1f60 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+0xe8/0x6bc block/bdev.c:930 blkdev_close+0x50/0x90 block/fops.c:514 __fput+0x1bc/0x7b8 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x1ec/0x278 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x1fa0/0x2aa4 arch/arm64/kernel/signal.c:1151 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+0x98/0x128 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.1.18:4600 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.18 state:D stack:0 pid:4600 ppid:4587 flags:0x00000001 Call trace: __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5245 [inline] __schedule+0xdd0/0x1b0c kernel/sched/core.c:6562 schedule+0xc4/0x170 kernel/sched/core.c:6638 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6697 __mutex_lock_common+0xafc/0x1f60 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+0xe8/0x6bc block/bdev.c:930 blkdev_close+0x50/0x90 block/fops.c:514 __fput+0x1bc/0x7b8 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x1ec/0x278 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x1fa0/0x2aa4 arch/arm64/kernel/signal.c:1151 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+0x98/0x128 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.1.18:4601 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.18 state:D stack:0 pid:4601 ppid:4587 flags:0x00000009 Call trace: __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5245 [inline] __schedule+0xdd0/0x1b0c kernel/sched/core.c:6562 schedule+0xc4/0x170 kernel/sched/core.c:6638 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6697 __mutex_lock_common+0xafc/0x1f60 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+0xe8/0x6bc block/bdev.c:930 blkdev_close+0x50/0x90 block/fops.c:514 __fput+0x1bc/0x7b8 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x1ec/0x278 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x1fa0/0x2aa4 arch/arm64/kernel/signal.c:1151 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+0x98/0x128 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: ffff800015417df0 (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: ffff800015418610 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517 1 lock held by khungtaskd/28: #0: ffff800015417480 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349 3 locks held by kworker/u4:2/39: #0: ffff00019f50f198 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2c/0x44 kernel/sched/core.c:538 #1: ffff00019f4fbbc8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2ec/0x608 kernel/sched/psi.c:987 #2: ffff00019f4fc798 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x11c/0x224 kernel/time/timer.c:999 1 lock held by klogd/3925: #0: ffff00019f50f198 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:538 [inline] #0: ffff00019f50f198 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1362 [inline] #0: ffff00019f50f198 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1652 [inline] #0: ffff00019f50f198 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2b8/0x1b0c kernel/sched/core.c:6478 2 locks held by getty/4079: #0: ffff0000d1767098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80001dfd62f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2ec/0xfa0 drivers/tty/n_tty.c:2198 3 locks held by kworker/1:10/4422: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b8/0x13a4 kernel/workqueue.c:2265 #1: ffff800020ba7c20 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x6fc/0x13a4 kernel/workqueue.c:2267 #2: ffff0000db7e9240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x1d0/0x27cc drivers/net/netdevsim/fib.c:1491 1 lock held by udevd/4583: #0: ffff0000cf5d34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8c4 block/bdev.c:832 1 lock held by syz.0.17/4584: #0: ffff0000cf5d34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.0.17/4585: #0: ffff0000cf5d34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by udevd/4589: #0: ffff0000cf6bd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8c4 block/bdev.c:832 1 lock held by udevd/4590: #0: ffff0000cf6b84c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8c4 block/bdev.c:832 1 lock held by syz.1.18/4600: #0: ffff0000cf6b84c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.1.18/4601: #0: ffff0000cf6b84c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.2.19/4614: #0: ffff0000cf6bd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.2.19/4615: #0: ffff0000cf6bd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by udevd/4624: #0: ffff0000cf69b4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8c4 block/bdev.c:832 1 lock held by syz.3.20/4635: #0: ffff0000cf69b4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.3.20/4636: #0: ffff0000cf69b4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by udevd/4639: #0: ffff0000cf7c04c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8c4 block/bdev.c:832 1 lock held by udevd/4641: #0: ffff0000cf7c54c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8c4 block/bdev.c:832 1 lock held by syz.4.21/4661: #0: ffff0000cf7c04c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.4.21/4662: #0: ffff0000cf7c04c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.5.22/4685: #0: ffff0000cf7c54c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.5.22/4686: #0: ffff0000cf7c54c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by udevd/4690: #0: ffff0000cf7ea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8c4 block/bdev.c:832 1 lock held by udevd/4691: #0: ffff0000cf7ef4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8c4 block/bdev.c:832 1 lock held by syz.6.23/4711: #0: ffff0000cf7ea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.6.23/4712: #0: ffff0000cf7ea4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by udevd/4723: #0: ffff0000cf87c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8c4 block/bdev.c:832 1 lock held by syz.7.24/4742: #0: ffff0000cf7ef4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.7.24/4743: #0: ffff0000cf7ef4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.8.25/4767: #0: ffff0000cf87c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.8.25/4768: #0: ffff0000cf87c4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by udevd/4772: #0: ffff0000cf9314c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8c4 block/bdev.c:832 1 lock held by syz.9.26/4793: #0: ffff0000cf9314c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.9.26/4794: #0: ffff0000cf9314c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe8/0x6bc block/bdev.c:930 1 lock held by syz.0.27/4808: #0: ffff0000cf5d34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8c4 block/bdev.c:832 1 lock held by syz.0.27/4809: #0: ffff0000cf5d34c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x118/0x8c4 block/bdev.c:832 =============================================