INFO: task syz.0.639:7132 blocked for more than 143 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.639 state:D stack:0 pid:7132 tgid:7130 ppid:4726 task_flags:0x400040 flags:0x00000011 Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5510 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7326 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7383 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x4ec/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 sync_bdevs+0x214/0x3d4 block/bdev.c:1297 ksys_sync+0xc4/0x118 fs/sync.c:105 __arm64_sys_sync+0x14/0x24 fs/sync.c:111 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 INFO: task syz.1.711:7331 blocked for more than 143 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.711 state:D stack:0 pid:7331 tgid:7330 ppid:4712 task_flags:0x400140 flags:0x00000011 Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5510 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7326 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7383 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x4ec/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 sync_bdevs+0x214/0x3d4 block/bdev.c:1297 ksys_sync+0xc4/0x118 fs/sync.c:105 __arm64_sys_sync+0x14/0x24 fs/sync.c:111 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffff800088cc6f60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffff800088cc6f60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #0: ffff800088cc6f60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x4c/0x188 kernel/locking/lockdep.c:6775 3 locks held by kworker/u9:0/50: #0: ffff0000ccd23940 ((wq_completion)hci0){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff0000ccd23940 ((wq_completion)hci0){+.+.}-{0:0}, at: process_scheduled_works+0x734/0x10b8 kernel/workqueue.c:3405 #1: ffff800090217c40 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffff800090217c40 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x73c/0x10b8 kernel/workqueue.c:3405 #2: ffff0000d0b38ea0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x178/0x374 net/bluetooth/hci_sync.c:331 2 locks held by getty/4493: #0: ffff0000cab830a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff8000924ae2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x348/0xf78 drivers/tty/n_tty.c:2211 1 lock held by udevd/4724: #0: ffff0000c7b6d350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:948 1 lock held by syz.0.639/7132: #0: ffff0000c7b6d350 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x214/0x3d4 block/bdev.c:1297 1 lock held by syz.1.711/7331: #0: ffff0000c7b6d350 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x214/0x3d4 block/bdev.c:1297 3 locks held by syz-executor/7700: 3 locks held by kworker/u8:56/8152: 1 lock held by syz.7.2042/11675: #0: ffff0000d2c11cd0 (&nft_net->commit_mutex){+.+.}-{4:4}, at: nf_tables_valid_genid+0x44/0x11c net/netfilter/nf_tables_api.c:11507 1 lock held by syz.5.2068/11738: #0: ffff0000da62ef80 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff0000da62ef80 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: __sock_release+0x7c/0x1d4 net/socket.c:709 1 lock held by syz.4.2069/11743: #0: ffff0000d5e89978 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline] #0: ffff0000d5e89978 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1a8/0x46c mm/util.c:579 2 locks held by syz.4.2069/11745: =============================================