Bluetooth: hci4: command 0x0406 tx timeout Bluetooth: hci2: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout Bluetooth: hci1: command 0x0406 tx timeout Bluetooth: hci3: command 0x0406 tx timeout INFO: task syz-executor.1:9852 blocked for more than 140 seconds. Not tainted 4.19.178-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D26664 9852 8489 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 nbd_start_device_ioctl drivers/block/nbd.c:1278 [inline] __nbd_ioctl drivers/block/nbd.c:1347 [inline] nbd_ioctl+0x2d6/0xb30 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007fa0355b1188 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: 00007ffe0ec5136f R14: 00007fa0355b1300 R15: 0000000000022000 INFO: task syz-executor.1:10004 blocked for more than 140 seconds. Not tainted 4.19.178-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29216 10004 8489 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 blk_mq_freeze_queue_wait+0x105/0x220 block/blk-mq.c:152 blk_freeze_queue+0x3d/0x60 block/blk-mq.c:181 blk_mq_freeze_queue+0x9/0x10 block/blk-mq.c:190 nbd_add_socket+0x109/0x840 drivers/block/nbd.c:973 __nbd_ioctl drivers/block/nbd.c:1320 [inline] nbd_ioctl+0x4fd/0xb30 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007fa03556f188 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: 00007ffe0ec5136f R14: 00007fa03556f300 R15: 0000000000022000 INFO: task syz-executor.1:10006 blocked for more than 140 seconds. Not tainted 4.19.178-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29208 10006 8489 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007fa03552d188 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: 00007ffe0ec5136f R14: 00007fa03552d300 R15: 0000000000022000 INFO: task syz-executor.4:10012 blocked for more than 140 seconds. Not tainted 4.19.178-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29184 10012 8492 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 blk_mq_freeze_queue_wait+0x105/0x220 block/blk-mq.c:152 blk_freeze_queue+0x3d/0x60 block/blk-mq.c:181 blk_mq_freeze_queue+0x9/0x10 block/blk-mq.c:190 nbd_add_socket+0x109/0x840 drivers/block/nbd.c:973 __nbd_ioctl drivers/block/nbd.c:1320 [inline] nbd_ioctl+0x4fd/0xb30 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007f4fd4243188 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: 00007ffcb54d539f R14: 00007f4fd4243300 R15: 0000000000022000 INFO: task syz-executor.3:9976 blocked for more than 140 seconds. Not tainted 4.19.178-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27864 9976 8493 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 nbd_start_device_ioctl drivers/block/nbd.c:1278 [inline] __nbd_ioctl drivers/block/nbd.c:1347 [inline] nbd_ioctl+0x2d6/0xb30 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007f0e4a53f188 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: 00007fff880ddfef R14: 00007f0e4a53f300 R15: 0000000000022000 INFO: task syz-executor.3:10015 blocked for more than 140 seconds. Not tainted 4.19.178-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29216 10015 8493 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 blk_mq_freeze_queue_wait+0x105/0x220 block/blk-mq.c:152 blk_freeze_queue+0x3d/0x60 block/blk-mq.c:181 blk_mq_freeze_queue+0x9/0x10 block/blk-mq.c:190 nbd_add_socket+0x109/0x840 drivers/block/nbd.c:973 __nbd_ioctl drivers/block/nbd.c:1320 [inline] nbd_ioctl+0x4fd/0xb30 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007f0e4a4fd188 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: 00007fff880ddfef R14: 00007f0e4a4fd300 R15: 0000000000022000 INFO: task syz-executor.5:10000 blocked for more than 140 seconds. Not tainted 4.19.178-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28728 10000 8488 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 blk_mq_freeze_queue_wait+0x105/0x220 block/blk-mq.c:152 blk_freeze_queue+0x3d/0x60 block/blk-mq.c:181 blk_mq_freeze_queue+0x9/0x10 block/blk-mq.c:190 nbd_add_socket+0x109/0x840 drivers/block/nbd.c:973 __nbd_ioctl drivers/block/nbd.c:1320 [inline] nbd_ioctl+0x4fd/0xb30 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007fbc6090b188 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: 00007ffc7f5d986f R14: 00007fbc6090b300 R15: 0000000000022000 INFO: task syz-executor.5:10018 blocked for more than 140 seconds. Not tainted 4.19.178-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29208 10018 8488 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007fbc608ea188 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: 00007ffc7f5d986f R14: 00007fbc608ea300 R15: 0000000000022000 INFO: task syz-executor.2:9993 blocked for more than 140 seconds. Not tainted 4.19.178-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27656 9993 8487 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x4c3/0x1200 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 nbd_start_device_ioctl drivers/block/nbd.c:1278 [inline] __nbd_ioctl drivers/block/nbd.c:1347 [inline] nbd_ioctl+0x2d6/0xb30 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007f648bddd188 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: 00007fff02883b9f R14: 00007f648bddd300 R15: 0000000000022000 INFO: task syz-executor.2:10017 blocked for more than 140 seconds. Not tainted 4.19.178-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28712 10017 8487 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 blk_mq_freeze_queue_wait+0x105/0x220 block/blk-mq.c:152 blk_freeze_queue+0x3d/0x60 block/blk-mq.c:181 blk_mq_freeze_queue+0x9/0x10 block/blk-mq.c:190 nbd_add_socket+0x109/0x840 drivers/block/nbd.c:973 __nbd_ioctl drivers/block/nbd.c:1320 [inline] nbd_ioctl+0x4fd/0xb30 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x7ea/0x1790 block/ioctl.c:601 block_ioctl+0xd7/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465b09 Code: Bad RIP value. RSP: 002b:00007f648bd9b188 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: 00007fff02883b9f R14: 00007f648bd9b300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1567: #0: 000000006052f99a (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4442 2 locks held by in:imklog/7805: #0: 000000005aae1659 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa7/0xd0 fs/file.c:767 #1: 0000000083f3583c (&rq->lock){-.-.}, at: prepare_to_wait_event+0x6e/0x7e0 kernel/sched/wait.c:266 1 lock held by syz-executor.1/9852: #0: 000000008ea7e38c (&nbd->config_lock){+.+.}, at: nbd_start_device_ioctl drivers/block/nbd.c:1278 [inline] #0: 000000008ea7e38c (&nbd->config_lock){+.+.}, at: __nbd_ioctl drivers/block/nbd.c:1347 [inline] #0: 000000008ea7e38c (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x2d6/0xb30 drivers/block/nbd.c:1387 1 lock held by syz-executor.1/10004: #0: 000000008ea7e38c (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.1/10006: #0: 000000008ea7e38c (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.4/10012: #0: 000000005e000074 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.3/9976: #0: 00000000599af0e6 (&nbd->config_lock){+.+.}, at: nbd_start_device_ioctl drivers/block/nbd.c:1278 [inline] #0: 00000000599af0e6 (&nbd->config_lock){+.+.}, at: __nbd_ioctl drivers/block/nbd.c:1347 [inline] #0: 00000000599af0e6 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x2d6/0xb30 drivers/block/nbd.c:1387 1 lock held by syz-executor.3/10015: #0: 00000000599af0e6 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.5/10000: #0: 000000008cdbefca (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.5/10018: #0: 000000008cdbefca (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.2/9993: #0: 00000000d8a263c9 (&nbd->config_lock){+.+.}, at: nbd_start_device_ioctl drivers/block/nbd.c:1278 [inline] #0: 00000000d8a263c9 (&nbd->config_lock){+.+.}, at: __nbd_ioctl drivers/block/nbd.c:1347 [inline] #0: 00000000d8a263c9 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x2d6/0xb30 drivers/block/nbd.c:1387 1 lock held by syz-executor.2/10017: #0: 00000000d8a263c9 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.2/10019: #0: 00000000d8a263c9 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.0/10008: #0: 000000002873aba0 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.0/10011: #0: 000000002873aba0 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.0/10013: #0: 000000002873aba0 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.0/10014: #0: 000000002873aba0 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.0/10023: #0: 000000002873aba0 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.0/10024: #0: 000000002873aba0 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.0/10025: #0: 000000002873aba0 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 1 lock held by syz-executor.0/10026: #0: 000000002873aba0 (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x12a/0xb30 drivers/block/nbd.c:1380 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1567 Comm: khungtaskd Not tainted 4.19.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x226 lib/dump_stack.c:118 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x5c3/0xb40 kernel/hung_task.c:287 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x12/0x20 arch/x86/include/asm/irqflags.h:60