Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout Bluetooth: hci0 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 186s! INFO: task kworker/u4:0:5 blocked for more than 140 seconds. Showing busy workqueues and worker pools: workqueue events: flags=0x0 Not tainted 4.14.275-syzkaller #0 pwq 0: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:0 D27304 5 2 0x80000000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 cpus=0 node=0 flags=0x0 nice=0 active=13/256 refcnt=14 in-flight: 3:rtc_timer_do_work pending: defense_work_handler, defense_work_handler, macvlan_process_broadcast, defense_work_handler, defense_work_handler, defense_work_handler , defense_work_handler , vmstat_shepherd schedule+0x8d/0x1b0 kernel/sched/core.c:3431 , cache_reap, macvlan_process_broadcast, macvlan_process_broadcast, macvlan_process_broadcast workqueue events_unbound: flags=0x2 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 pwq 4: cpus=0-1 flags=0x4 nice=0 active=4/512 refcnt=7 in-flight: 10583:fsnotify_mark_destroy_workfn fsnotify_mark_destroy_workfn, 5:fsnotify_connector_destroy_workfn fsnotify_connector_destroy_workfn workqueue events_power_efficient: flags=0x80 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=5/256 refcnt=6 pending: fb_flashcursor, process_srcu, process_srcu, neigh_periodic_work, do_cache_clean workqueue mm_percpu_wq: flags=0x8 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256 refcnt=4 pending: lru_add_drain_per_cpu BAR(12614), vmstat_update workqueue cgroup_pidlist_destroy: flags=0x0 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1 refcnt=2 pending: cgroup_pidlist_destroy_work_fn workqueue bat_events: flags=0xe000a pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=9 pending: batadv_nc_worker delayed: batadv_nc_worker, batadv_nc_worker, batadv_nc_worker, batadv_nc_worker, batadv_nc_worker pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=186s workers=5 idle: 4645 3625 9129 24 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 pool 4: cpus=0-1 flags=0x4 nice=0 hung=0s workers=8 idle: 126 22 9440 2904 34 __synchronize_srcu+0x10a/0x1d0 kernel/rcu/srcutree.c:898 fsnotify_connector_destroy_workfn+0x49/0xa0 fs/notify/mark.c:156 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 INFO: task kworker/u4:7:10583 blocked for more than 140 seconds. Not tainted 4.14.275-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:7 D29056 10583 2 0x80000000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 __synchronize_srcu+0x10a/0x1d0 kernel/rcu/srcutree.c:898 fsnotify_mark_destroy_workfn+0xed/0x2e0 fs/notify/mark.c:757 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 INFO: task systemd-udevd:12590 blocked for more than 140 seconds. Not tainted 4.14.275-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D28640 12590 4631 0x00000304 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 btrfs_scan_one_device+0x77/0x330 fs/btrfs/volumes.c:1147 btrfs_control_ioctl+0x150/0x200 fs/btrfs/super.c:2211 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fe215e47017 RSP: 002b:00007fffbeed78c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe215e47017 RDX: 00007fffbeed78e0 RSI: 0000000090009427 RDI: 000000000000000f RBP: 00007fffbeed78e0 R08: 0000000000000000 R09: 0000000000000138 R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000000f R13: 0000000000000000 R14: 000055afee4123e0 R15: 000055afee40eca0 INFO: task syz-executor.4:12614 blocked for more than 140 seconds. Not tainted 4.14.275-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28896 12614 7994 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 flush_work+0x3fe/0x770 kernel/workqueue.c:2894 lru_add_drain_all_cpuslocked+0x2e6/0x450 mm/swap.c:722 lru_add_drain_all+0xf/0x20 mm/swap.c:730 invalidate_bdev+0x8a/0xc0 fs/block_dev.c:109 loop_clr_fd+0x4c8/0xc20 drivers/block/loop.c:1062 lo_ioctl+0x895/0x1cd0 drivers/block/loop.c:1424 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x540/0x1830 block/ioctl.c:594 block_ioctl+0xd9/0x120 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f9086801e07 RSP: 002b:00007f9085176f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000200010c0 RCX: 00007f9086801e07 RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000004 RBP: 00007f90851776b8 R08: 00007f9085177020 R09: 0000000020000040 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000016 R14: 00007f9085176fe0 R15: 0000000020001280 INFO: task syz-executor.3:12636 blocked for more than 140 seconds. Not tainted 4.14.275-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27208 12636 7993 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 lru_add_drain_all_cpuslocked+0x6c/0x450 mm/swap.c:704 lru_add_drain_all+0xf/0x20 mm/swap.c:730 invalidate_bdev+0x8a/0xc0 fs/block_dev.c:109 btrfs_get_bdev_and_sb+0xb0/0x2c0 fs/btrfs/volumes.c:311 __btrfs_open_devices+0x172/0xa30 fs/btrfs/volumes.c:994 btrfs_open_devices+0x98/0xb0 fs/btrfs/volumes.c:1066 btrfs_mount+0xb24/0x1fe0 fs/btrfs/super.c:1606 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046 vfs_kern_mount+0x3c/0x60 fs/namespace.c:1036 mount_subvol fs/btrfs/super.c:1398 [inline] btrfs_mount+0x42a/0x1fe0 fs/btrfs/super.c:1569 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2572 [inline] do_mount+0xe65/0x2a10 fs/namespace.c:2902 SYSC_mount fs/namespace.c:3118 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3095 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fd9d736657a RSP: 002b:00007fd9d5cb8f88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007fd9d736657a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fd9d5cb8fe0 RBP: 00007fd9d5cb9020 R08: 00007fd9d5cb9020 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fd9d5cb8fe0 R15: 0000000020000a40 INFO: task syz-executor.0:12629 blocked for more than 140 seconds. Not tainted 4.14.275-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28864 12629 7990 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 __synchronize_srcu+0x10a/0x1d0 kernel/rcu/srcutree.c:898 install_new_memslots+0xed/0x260 arch/x86/kvm/../../../virt/kvm/kvm_main.c:919 __kvm_set_memory_region+0x1283/0x1ab0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1096 __x86_set_memory_region+0x21b/0x490 arch/x86/kvm/x86.c:8505 alloc_identity_pagetable arch/x86/kvm/vmx.c:5161 [inline] init_rmode_identity_map arch/x86/kvm/vmx.c:5081 [inline] vmx_create_vcpu+0xec7/0x29d0 arch/x86/kvm/vmx.c:10099 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:2573 [inline] kvm_vm_ioctl+0x4ca/0x13e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3081 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f009f935049 RSP: 002b:00007f009e2aa168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f009fa47f60 RCX: 00007f009f935049 RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000004 RBP: 00007f009f98f08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffed8bc2a9f R14: 00007f009e2aa300 R15: 0000000000022000 INFO: task syz-executor.0:12639 blocked for more than 140 seconds. Not tainted 4.14.275-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29760 12639 7990 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 kvm_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1118 [inline] kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1131 [inline] kvm_vm_ioctl+0x3d8/0x13e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3091 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f009f934e07 RSP: 002b:00007f009e2875d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000020fe8000 RCX: 00007f009f934e07 RDX: 00007f009e287d10 RSI: 000000004020ae46 RDI: 0000000000000004 RBP: 0000000000000004 R08: 0000000000000001 R09: 0000000000000006 R10: 0000000000000004 R11: 0000000000000246 R12: 00000000fec00000 R13: 00007f009e287d10 R14: 0000000000000001 R15: 0000000020fe8000 INFO: task syz-executor.0:12644 blocked for more than 140 seconds. Not tainted 4.14.275-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D30216 12644 7990 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 kvm_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1118 [inline] kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1131 [inline] kvm_vm_ioctl+0x3d8/0x13e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3091 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f009f935049 RSP: 002b:00007f009e268168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f009fa48100 RCX: 00007f009f935049 RDX: 0000000020000180 RSI: 000000004020ae46 RDI: 0000000000000004 RBP: 00007f009f98f08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffed8bc2a9f R14: 00007f009e268300 R15: 0000000000022000 INFO: task syz-executor.0:12650 blocked for more than 140 seconds. Not tainted 4.14.275-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29344 12650 7990 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 init_rmode_identity_map arch/x86/kvm/vmx.c:5074 [inline] vmx_create_vcpu+0xe56/0x29d0 arch/x86/kvm/vmx.c:10099 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:2573 [inline] kvm_vm_ioctl+0x4ca/0x13e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3081 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f009f935049 RSP: 002b:00007f009e247168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f009fa481d0 RCX: 00007f009f935049 RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000013 RBP: 00007f009f98f08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffed8bc2a9f R14: 00007f009e247300 R15: 0000000000022000 INFO: task syz-executor.0:12653 blocked for more than 140 seconds. Not tainted 4.14.275-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D30216 12653 7990 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 kvm_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1118 [inline] kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1131 [inline] kvm_vm_ioctl+0x3d8/0x13e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3091 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f009f935049 RSP: 002b:00007f009e226168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f009fa482a0 RCX: 00007f009f935049 RDX: 00000000200000c0 RSI: 000000004020ae46 RDI: 0000000000000013 RBP: 00007f009f98f08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffed8bc2a9f R14: 00007f009e226300 R15: 0000000000022000 Showing all locks held in the system: 2 locks held by kworker/u4:0/5: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: (connector_reaper_work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 2 locks held by kworker/u4:7/10583: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((reaper_work).work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 1 lock held by systemd-udevd/12590: #0: (uuid_mutex){+.+.}, at: [] btrfs_scan_one_device+0x77/0x330 fs/btrfs/volumes.c:1147 3 locks held by syz-executor.4/12614: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x1cd0 drivers/block/loop.c:1414 #1: (cpu_hotplug_lock.rw_sem){++++}, at: [] get_online_cpus include/linux/cpu.h:145 [inline] #1: (cpu_hotplug_lock.rw_sem){++++}, at: [] lru_add_drain_all+0xa/0x20 mm/swap.c:729 #2: (lock#6){+.+.}, at: [] lru_add_drain_all_cpuslocked+0x6c/0x450 mm/swap.c:704 3 locks held by syz-executor.3/12636: #0: (uuid_mutex){+.+.}, at: [] btrfs_open_devices+0x22/0xb0 fs/btrfs/volumes.c:1061 #1: (cpu_hotplug_lock.rw_sem){++++}, at: [] get_online_cpus include/linux/cpu.h:145 [inline] #1: (cpu_hotplug_lock.rw_sem){++++}, at: [] lru_add_drain_all+0xa/0x20 mm/swap.c:729 #2: (lock#6){+.+.}, at: [] lru_add_drain_all_cpuslocked+0x6c/0x450 mm/swap.c:704 1 lock held by syz-executor.0/12629: #0: (&kvm->slots_lock){+.+.}, at: [] init_rmode_identity_map arch/x86/kvm/vmx.c:5074 [inline] #0: (&kvm->slots_lock){+.+.}, at: [] vmx_create_vcpu+0xe56/0x29d0 arch/x86/kvm/vmx.c:10099 1 lock held by syz-executor.0/12639: #0: (&kvm->slots_lock){+.+.}, at: [] kvm_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1118 [inline] #0: (&kvm->slots_lock){+.+.}, at: [] kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1131 [inline] #0: (&kvm->slots_lock){+.+.}, at: [] kvm_vm_ioctl+0x3d8/0x13e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3091 1 lock held by syz-executor.0/12644: #0: (&kvm->slots_lock){+.+.}, at: [] kvm_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1118 [inline] #0: (&kvm->slots_lock){+.+.}, at: [] kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1131 [inline] #0: (&kvm->slots_lock){+.+.}, at: [] kvm_vm_ioctl+0x3d8/0x13e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3091 1 lock held by syz-executor.0/12650: #0: (&kvm->slots_lock){+.+.}, at: [] init_rmode_identity_map arch/x86/kvm/vmx.c:5074 [inline] #0: (&kvm->slots_lock){+.+.}, at: [] vmx_create_vcpu+0xe56/0x29d0 arch/x86/kvm/vmx.c:10099 1 lock held by syz-executor.0/12653: #0: (&kvm->slots_lock){+.+.}, at: [] kvm_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1118 [inline] #0: (&kvm->slots_lock){+.+.}, at: [] kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1131 [inline] #0: (&kvm->slots_lock){+.+.}, at: [] kvm_vm_ioctl+0x3d8/0x13e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3091 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.275-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+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3540 Comm: kworker/u4:5 Not tainted 4.14.275-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker task: ffff8880a93a6340 task.stack: ffff8880a8cb8000 RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x50 kernel/kcov.c:65 RSP: 0018:ffff8880a8cbfcd0 EFLAGS: 00000246 RAX: ffff8880a93a6340 RBX: ffff88808f461e80 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff8880a93a6bc4 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000020012 R10: ffff8880a93a6c18 R11: ffff8880a93a6340 R12: dffffc0000000000 R13: ffff8880a9355b00 R14: ffff88813fe468c0 R15: ffff8880a5e4d400 FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fda9acaa000 CR3: 00000000a1cc9000 CR4: 00000000003426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_unlock include/linux/rcupdate.h:681 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:422 [inline] batadv_nc_worker+0x838/0xc50 net/batman-adv/network-coding.c:728 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 00 e9 9f fe ff ff 4c 89 e7 e8 04 b1 29 00 e9 2c fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 c0 7f 02 00 <48> 85 c0 74 1a 65 8b 15 fb 3c ad 7e 81 e2 00 01 1f 00 75 0b 8b ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e9 9f fe ff ff jmpq 0xfffffea4 5: 4c 89 e7 mov %r12,%rdi 8: e8 04 b1 29 00 callq 0x29b111 d: e9 2c fe ff ff jmpq 0xfffffe3e 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 65 48 8b 04 25 c0 7f mov %gs:0x27fc0,%rax 28: 02 00 * 2a: 48 85 c0 test %rax,%rax <-- trapping instruction 2d: 74 1a je 0x49 2f: 65 8b 15 fb 3c ad 7e mov %gs:0x7ead3cfb(%rip),%edx # 0x7ead3d31 36: 81 e2 00 01 1f 00 and $0x1f0100,%edx 3c: 75 0b jne 0x49 3e: 8b .byte 0x8b