INFO: task syz.0.1285:10335 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.1285 state:D stack:0 pid:10335 tgid:10334 ppid:6582 task_flags:0x400040 flags:0x00000011 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 sync_bdevs+0x210/0x3f0 block/bdev.c:1305 ksys_sync+0xb8/0x164 fs/sync.c:105 __arm64_sys_sync+0x14/0x24 fs/sync.c:113 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz.0.1285:10341 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.1285 state:D stack:0 pid:10341 tgid:10334 ppid:6582 task_flags:0x400040 flags:0x00800011 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 sync_bdevs+0x210/0x3f0 block/bdev.c:1305 ksys_sync+0xb8/0x164 fs/sync.c:105 __arm64_sys_sync+0x14/0x24 fs/sync.c:113 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz.0.1285:10342 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.1285 state:D stack:0 pid:10342 tgid:10334 ppid:6582 task_flags:0x400040 flags:0x00800011 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 sync_bdevs+0x210/0x3f0 block/bdev.c:1305 ksys_sync+0xb8/0x164 fs/sync.c:105 __arm64_sys_sync+0x14/0x24 fs/sync.c:113 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz.0.1285:10346 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.1285 state:D stack:0 pid:10346 tgid:10334 ppid:6582 task_flags:0x400040 flags:0x00800011 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 sync_bdevs+0x210/0x3f0 block/bdev.c:1305 ksys_sync+0xb8/0x164 fs/sync.c:105 __arm64_sys_sync+0x14/0x24 fs/sync.c:113 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz.0.1285:10348 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.1285 state:D stack:0 pid:10348 tgid:10334 ppid:6582 task_flags:0x400040 flags:0x00800011 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 sync_bdevs+0x210/0x3f0 block/bdev.c:1305 ksys_sync+0xb8/0x164 fs/sync.c:105 __arm64_sys_sync+0x14/0x24 fs/sync.c:113 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz.0.1285:10351 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.1285 state:D stack:0 pid:10351 tgid:10334 ppid:6582 task_flags:0x400040 flags:0x00800011 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 sync_bdevs+0x210/0x3f0 block/bdev.c:1305 ksys_sync+0xb8/0x164 fs/sync.c:105 __arm64_sys_sync+0x14/0x24 fs/sync.c:113 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz.0.1285:10352 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.1285 state:D stack:0 pid:10352 tgid:10334 ppid:6582 task_flags:0x400040 flags:0x00800001 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 sync_bdevs+0x210/0x3f0 block/bdev.c:1305 ksys_sync+0xb8/0x164 fs/sync.c:105 __arm64_sys_sync+0x14/0x24 fs/sync.c:113 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz.0.1285:10353 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.1285 state:D stack:0 pid:10353 tgid:10334 ppid:6582 task_flags:0x400040 flags:0x00800011 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 sync_bdevs+0x210/0x3f0 block/bdev.c:1305 ksys_sync+0xb8/0x164 fs/sync.c:105 __arm64_sys_sync+0x14/0x24 fs/sync.c:113 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c 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: ffff80008fa5b6e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 1 lock held by pr/ttyAMA-1/43: 3 locks held by kworker/u9:1/6164: #0: ffff0000cadf5148 ((wq_completion)hci6){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff800099e57be0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff000102ff0ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x184/0x38c net/bluetooth/hci_sync.c:331 2 locks held by syslogd/6196: 1 lock held by klogd/6200: 2 locks held by getty/6354: #0: ffff0000d51340a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff800099f1e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfc8 drivers/tty/n_tty.c:2211 1 lock held by udevd/6565: #0: ffff0000cc07d358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:962 3 locks held by kworker/0:8/6807: #0: ffff0000c0029948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff8000a1267be0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff0000d656e240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x188/0x308 drivers/net/netdevsim/fib.c:1490 1 lock held by udevd/6814: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xcc/0xc20 block/bdev.c:962 1 lock held by syz.0.1285/10335: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.0.1285/10341: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.0.1285/10342: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.0.1285/10346: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.0.1285/10348: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.0.1285/10351: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.0.1285/10352: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.0.1285/10353: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.1.1304/10408: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.1.1304/10415: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.1.1304/10416: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.1.1304/10417: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.1.1304/10418: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.1.1304/10419: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.1.1304/10424: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.1.1304/10425: #0: ffff0000cc1d8358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x210/0x3f0 block/bdev.c:1305 1 lock held by syz.4.2141/13284: 1 lock held by syz.3.2144/13290: 2 locks held by syz.3.2144/13305: =============================================