Bluetooth: hci0 command 0x0406 tx timeout Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout INFO: task syz-executor.4:9690 blocked for more than 140 seconds. Not tainted 4.14.222-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29384 9690 8336 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 blk_mq_freeze_queue_wait+0xfd/0x1e0 block/blk-mq.c:154 blk_freeze_queue+0x3d/0x60 block/blk-mq.c:183 blk_mq_freeze_queue+0x9/0x10 block/blk-mq.c:192 nbd_add_socket+0xfd/0x810 drivers/block/nbd.c:959 __nbd_ioctl drivers/block/nbd.c:1307 [inline] nbd_ioctl+0x485/0xad0 drivers/block/nbd.c:1374 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x7c0/0x1760 block/ioctl.c:594 block_ioctl+0xd7/0x130 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x74/0x80 fs/ioctl.c:692 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f4bb4b3e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffc6a45120f R14: 00007f4bb4b3e300 R15: 0000000000022000 INFO: task syz-executor.4:9691 blocked for more than 140 seconds. Not tainted 4.14.222-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29384 9691 8336 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x519/0x1490 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x7c0/0x1760 block/ioctl.c:594 block_ioctl+0xd7/0x130 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x74/0x80 fs/ioctl.c:692 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f4bb4b1d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000000000401 RSI: 000000000000ab09 RDI: 0000000000000006 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffc6a45120f R14: 00007f4bb4b1d300 R15: 0000000000022000 INFO: task syz-executor.4:9694 blocked for more than 140 seconds. Not tainted 4.14.222-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29384 9694 8336 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x519/0x1490 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x7c0/0x1760 block/ioctl.c:594 block_ioctl+0xd7/0x130 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x74/0x80 fs/ioctl.c:692 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f4bb4afc188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c0b0 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0b0 R13: 00007ffc6a45120f R14: 00007f4bb4afc300 R15: 0000000000022000 INFO: task syz-executor.4:9696 blocked for more than 140 seconds. Not tainted 4.14.222-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29384 9696 8336 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x519/0x1490 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x7c0/0x1760 block/ioctl.c:594 block_ioctl+0xd7/0x130 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x74/0x80 fs/ioctl.c:692 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f4bb4adb188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c158 RCX: 0000000000465b09 RDX: 0000240000000000 RSI: 000000000000ab07 RDI: 0000000000000008 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c158 R13: 00007ffc6a45120f R14: 00007f4bb4adb300 R15: 0000000000022000 INFO: task syz-executor.4:9732 blocked for more than 140 seconds. Not tainted 4.14.222-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29672 9732 8336 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x519/0x1490 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x7c0/0x1760 block/ioctl.c:594 block_ioctl+0xd7/0x130 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x74/0x80 fs/ioctl.c:692 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f4bb4a99188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c2a8 RCX: 0000000000465b09 RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c2a8 R13: 00007ffc6a45120f R14: 00007f4bb4a99300 R15: 0000000000022000 INFO: task syz-executor.4:9736 blocked for more than 140 seconds. Not tainted 4.14.222-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29736 9736 8336 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x519/0x1490 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x7c0/0x1760 block/ioctl.c:594 block_ioctl+0xd7/0x130 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x74/0x80 fs/ioctl.c:692 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f4bb4a78188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c350 RCX: 0000000000465b09 RDX: 0000000000000401 RSI: 000000000000ab09 RDI: 0000000000000006 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c350 R13: 00007ffc6a45120f R14: 00007f4bb4a78300 R15: 0000000000022000 INFO: task syz-executor.4:9749 blocked for more than 140 seconds. Not tainted 4.14.222-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29736 9749 8336 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x519/0x1490 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x7c0/0x1760 block/ioctl.c:594 block_ioctl+0xd7/0x130 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x74/0x80 fs/ioctl.c:692 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f4bb4a57188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c3f8 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c3f8 R13: 00007ffc6a45120f R14: 00007f4bb4a57300 R15: 0000000000022000 INFO: task syz-executor.4:9768 blocked for more than 140 seconds. Not tainted 4.14.222-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29736 9768 8336 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x519/0x1490 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x7c0/0x1760 block/ioctl.c:594 block_ioctl+0xd7/0x130 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x74/0x80 fs/ioctl.c:692 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007f4bb4a36188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c4a0 RCX: 0000000000465b09 RDX: 0000240000000000 RSI: 000000000000ab07 RDI: 0000000000000008 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c4a0 R13: 00007ffc6a45120f R14: 00007f4bb4a36300 R15: 0000000000022000 INFO: task syz-executor.3:9795 blocked for more than 140 seconds. Not tainted 4.14.222-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29088 9795 8343 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 blk_mq_freeze_queue_wait+0xfd/0x1e0 block/blk-mq.c:154 blk_freeze_queue+0x3d/0x60 block/blk-mq.c:183 blk_mq_freeze_queue+0x9/0x10 block/blk-mq.c:192 nbd_add_socket+0xfd/0x810 drivers/block/nbd.c:959 __nbd_ioctl drivers/block/nbd.c:1307 [inline] nbd_ioctl+0x485/0xad0 drivers/block/nbd.c:1374 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x7c0/0x1760 block/ioctl.c:594 block_ioctl+0xd7/0x130 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x74/0x80 fs/ioctl.c:692 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007fb02e142188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffd249f988f R14: 00007fb02e142300 R15: 0000000000022000 INFO: task syz-executor.3:9833 blocked for more than 140 seconds. Not tainted 4.14.222-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29672 9833 8343 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x824/0x1ee0 kernel/sched/core.c:3384 schedule+0x7f/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x519/0x1490 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x7c0/0x1760 block/ioctl.c:594 block_ioctl+0xd7/0x130 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x74/0x80 fs/ioctl.c:692 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007fb02e121188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c0b0 RCX: 0000000000465b09 RDX: 0000000000000401 RSI: 000000000000ab09 RDI: 0000000000000006 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0b0 R13: 00007ffd249f988f R14: 00007fb02e121300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1522: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7683: #0: (&(&(__futex_data.queues)[i].lock)->rlock){+.+.}, at: [] try_to_wake_up+0x82/0x1110 kernel/sched/core.c:1997 1 lock held by syz-executor.4/9690: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.4/9691: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.4/9694: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.4/9696: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.4/9732: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.4/9736: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.4/9749: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.4/9768: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.3/9795: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.3/9833: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.3/9838: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.0/9801: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.0/9812: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.0/9821: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.0/9826: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.0/9835: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.0/9843: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.0/9850: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.0/9853: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.1/9829: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.1/9832: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.1/9836: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.1/9844: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.1/9858: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.1/9859: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.1/9860: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.1/9863: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.2/9842: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.2/9849: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.2/9852: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.2/9855: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.2/9862: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.2/9867: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.5/9848: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.5/9851: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.5/9854: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.5/9856: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.5/9865: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.5/9868: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.5/9869: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1522 Comm: khungtaskd Not tainted 4.14.222-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x14b/0x1e7 lib/dump_stack.c:58 nmi_cpu_backtrace.cold.0+0x3c/0x78 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xf6/0x120 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x51b/0xa70 kernel/hung_task.c:274 kthread+0x338/0x400 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4616 Comm: systemd-journal Not tainted 4.14.222-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a1148640 task.stack: ffff8880a1150000 RIP: 0010:find_held_lock+0x244/0x300 kernel/locking/lockdep.c:3626 RSP: 0018:ffff8880a1157c80 EFLAGS: 00000097 RAX: ffff8880a1157d00 RBX: ffff8880a1148ec8 RCX: ffff8880a1157d00 RDX: 0000000000000004 RSI: ffff8880a1157d00 RDI: ffff8880a1148ed8 RBP: ffff8880a1157cb8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8880a1148640 R12: ffff8880a1a6e518 R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a1a6e518 FS: 00007f165b2768c0(0000) GS:ffff8880ba700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f16586f4000 CR3: 00000000a143a000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_release kernel/locking/lockdep.c:3767 [inline] lock_release+0x251/0x820 kernel/locking/lockdep.c:4017 __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock+0x1a/0x50 kernel/locking/spinlock.c:184 spin_unlock include/linux/spinlock.h:357 [inline] __alloc_fd+0x189/0x420 fs/file.c:539 get_unused_fd_flags+0x93/0xd0 fs/file.c:550 do_sys_open+0x15e/0x350 fs/open.c:1079 SYSC_open fs/open.c:1099 [inline] SyS_open+0x19/0x20 fs/open.c:1094 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f165a806840 RSP: 002b:00007ffe42064718 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffe42064a20 RCX: 00007f165a806840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055f3e7912570 RBP: 000000000000000d R08: 000000000000c0ff R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055f3e7906040 R14: 00007ffe420649e0 R15: 000055f3e7911270 Code: 00 fc ff df 48 8b 75 d0 48 89 f2 48 c1 ea 03 0f b6 14 02 48 89 f0 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 32 48 8b 45 d0 44 89 28 <48> 83 c4 10 48 89 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 4c 89 fe