Bluetooth: hci4 command 0x0406 tx timeout Bluetooth: hci0 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.4:9639 blocked for more than 140 seconds. Not tainted 4.14.227-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28080 9639 8300 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_start_device_ioctl drivers/block/nbd.c:1265 [inline] __nbd_ioctl drivers/block/nbd.c:1334 [inline] nbd_ioctl+0x2ba/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:00007f479aedc188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd9d854a9f R14: 00007f479aedc300 R15: 0000000000022000 INFO: task syz-executor.4:9661 blocked for more than 140 seconds. Not tainted 4.14.227-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29752 9661 8300 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:00007f479ae9a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c0b0 RCX: 0000000000465b09 RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0b0 R13: 00007ffd9d854a9f R14: 00007f479ae9a300 R15: 0000000000022000 INFO: task syz-executor.4:9662 blocked for more than 140 seconds. Not tainted 4.14.227-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29736 9662 8300 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:00007f479ae79188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c158 RCX: 0000000000465b09 RDX: 0000000000000401 RSI: 000000000000ab09 RDI: 0000000000000006 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c158 R13: 00007ffd9d854a9f R14: 00007f479ae79300 R15: 0000000000022000 INFO: task syz-executor.4:9667 blocked for more than 140 seconds. Not tainted 4.14.227-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29736 9667 8300 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:00007f479ae58188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c200 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c200 R13: 00007ffd9d854a9f R14: 00007f479ae58300 R15: 0000000000022000 INFO: task syz-executor.4:9669 blocked for more than 140 seconds. Not tainted 4.14.227-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29736 9669 8300 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:00007f479ae37188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c2a8 RCX: 0000000000465b09 RDX: 0000240000000000 RSI: 000000000000ab07 RDI: 0000000000000008 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c2a8 R13: 00007ffd9d854a9f R14: 00007f479ae37300 R15: 0000000000022000 INFO: task syz-executor.5:9655 blocked for more than 140 seconds. Not tainted 4.14.227-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28968 9655 8299 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:00007fadcf65d188 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: 00007ffccc30342f R14: 00007fadcf65d300 R15: 0000000000022000 INFO: task syz-executor.5:9668 blocked for more than 140 seconds. Not tainted 4.14.227-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29736 9668 8299 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:00007fadcf63c188 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: 00007ffccc30342f R14: 00007fadcf63c300 R15: 0000000000022000 INFO: task syz-executor.5:9670 blocked for more than 140 seconds. Not tainted 4.14.227-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29672 9670 8299 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:00007fadcf61b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c158 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c158 R13: 00007ffccc30342f R14: 00007fadcf61b300 R15: 0000000000022000 INFO: task syz-executor.5:9676 blocked for more than 140 seconds. Not tainted 4.14.227-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29672 9676 8299 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:00007fadcf5fa188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c200 RCX: 0000000000465b09 RDX: 0000240000000000 RSI: 000000000000ab07 RDI: 0000000000000008 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c200 R13: 00007ffccc30342f R14: 00007fadcf5fa300 R15: 0000000000022000 INFO: task syz-executor.2:9763 blocked for more than 140 seconds. Not tainted 4.14.227-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29192 9763 8296 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:00007fa88d48c188 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: 00007fff1b6cdeff R14: 00007fa88d48c300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1529: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4548 1 lock held by syz-executor.4/9639: #0: (&nbd->config_lock){+.+.}, at: [] nbd_start_device_ioctl drivers/block/nbd.c:1265 [inline] #0: (&nbd->config_lock){+.+.}, at: [] __nbd_ioctl drivers/block/nbd.c:1334 [inline] #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x2ba/0xad0 drivers/block/nbd.c:1374 1 lock held by syz-executor.4/9661: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.4/9662: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.4/9667: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.4/9669: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.5/9655: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.5/9668: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.5/9670: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.5/9676: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.2/9763: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.2/9777: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.2/9781: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.2/9785: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.3/9764: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.3/9778: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.3/9782: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.3/9786: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.0/9746: #0: (&nbd->config_lock){+.+.}, at: [] nbd_start_device_ioctl drivers/block/nbd.c:1265 [inline] #0: (&nbd->config_lock){+.+.}, at: [] __nbd_ioctl drivers/block/nbd.c:1334 [inline] #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x2ba/0xad0 drivers/block/nbd.c:1374 1 lock held by syz-executor.0/9776: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.0/9779: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.0/9783: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.0/9787: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.1/9773: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.1/9780: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 1 lock held by syz-executor.1/9784: #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x122/0xad0 drivers/block/nbd.c:1367 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1529 Comm: khungtaskd Not tainted 4.14.227-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: 4606 Comm: systemd-journal Not tainted 4.14.227-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a18c03c0 task.stack: ffff8880a18c8000 RIP: 0010:unwind_get_return_address+0x17/0xa0 arch/x86/kernel/unwind_frame.c:14 RSP: 0018:ffff8880a18cf770 EFLAGS: 00000802 RAX: dffffc0000000000 RBX: ffff8880a18cf828 RCX: ffff8880a18cf7e0 RDX: 1ffff11014319ef1 RSI: ffff8880a18cfe28 RDI: ffff8880a18cf788 RBP: ffff8880a18cf778 R08: 1ffff11014319efb R09: ffff8880a18cf7c0 R10: ffff8880a18cf738 R11: ffff8880a18cf7e7 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8880a18c03c0 R15: ffff8880a18cfe70 FS: 00007fd4eea768c0(0000) GS:ffff8880ba700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd4ebeee000 CR3: 00000000a1dca000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __save_stack_trace+0x7e/0xd0 arch/x86/kernel/stacktrace.c:45 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xab/0x190 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 kzfree+0x26/0x30 mm/slab_common.c:1453 aa_free_file_ctx security/apparmor/include/file.h:76 [inline] apparmor_file_free_security+0x69/0x90 security/apparmor/lsm.c:441 security_file_free+0x3e/0x70 security/security.c:879 put_filp+0x17/0x80 fs/file_table.c:307 path_openat+0x11da/0x2760 fs/namei.c:3581 do_filp_open+0x16b/0x220 fs/namei.c:3603 do_sys_open+0x1d0/0x350 fs/open.c:1081 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: 0033:0x7fd4ee005840 RSP: 002b:00007ffe13d5db18 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffe13d5de20 RCX: 00007fd4ee005840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005598a97084d0 RBP: 000000000000000d R08: 000000000000c0c1 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 00005598a96fa040 R14: 00007ffe13d5dde0 R15: 00005598a97068f0 Code: 8b 45 a4 48 8b 55 a8 48 8b 4d b0 8b 45 b8 e9 ee fe ff ff 90 48 b8 00 00 00 00 00 fc ff df 48 89 fa 55 48 c1 ea 03 48 89 e5 41 54 <53> 0f b6 04 02 48 89 fb 84 c0 74 04 3c 03 7e 55 8b 03 85 c0 75