Bluetooth: hci2: command 0x0401 tx timeout Bluetooth: hci2: command 0x0401 tx timeout Bluetooth: hci2: command 0x0401 tx timeout Bluetooth: hci2: command 0x0401 tx timeout Bluetooth: hci2: command 0x0406 tx timeout INFO: task syz-executor.5:11711 blocked for more than 140 seconds. Not tainted 4.19.171-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28648 11711 8131 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072 hci_req_sync+0x69/0xb0 net/bluetooth/hci_request.c:278 hci_dev_cmd+0x533/0x840 net/bluetooth/hci_core.c:1934 hci_sock_ioctl+0x3f6/0x7d0 net/bluetooth/hci_sock.c:1045 sock_do_ioctl+0xcb/0x2d0 net/socket.c:950 sock_ioctl+0x2ef/0x5d0 net/socket.c:1074 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45e219 Code: Bad RIP value. RSP: 002b:00007fad46d1ec68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 00000000200000c0 RSI: 00000000400448dd RDI: 0000000000000004 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffe2d308d5f R14: 00007fad46d1f9c0 R15: 000000000119bf8c Showing all locks held in the system: 3 locks held by kworker/u4:1/23: #0: 00000000f0b195eb (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1824 [inline] #0: 00000000f0b195eb (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 00000000d29928cf (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 00000000d29928cf (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 #2: 000000005324aa68 (&base->lock){-.-.}, at: lock_timer_base+0x55/0x1b0 kernel/time/timer.c:950 1 lock held by khungtaskd/1560: #0: 00000000d29928cf (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/7787: #0: 0000000054532784 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor.1/11682: #0: 00000000157e23a1 (&hdev->req_lock){+.+.}, at: hci_req_sync+0x69/0xb0 net/bluetooth/hci_request.c:278 1 lock held by syz-executor.1/11703: #0: 000000000568ebf5 (&hdev->req_lock){+.+.}, at: hci_req_sync+0x69/0xb0 net/bluetooth/hci_request.c:278 1 lock held by syz-executor.5/11711: #0: 00000000157e23a1 (&hdev->req_lock){+.+.}, at: hci_req_sync+0x69/0xb0 net/bluetooth/hci_request.c:278 1 lock held by syz-executor.1/11724: #0: 000000004dd9a3ec (&hdev->req_lock){+.+.}, at: hci_req_sync+0x69/0xb0 net/bluetooth/hci_request.c:278 1 lock held by syz-executor.1/11737: #0: 000000002801103d (&hdev->req_lock){+.+.}, at: hci_req_sync+0x69/0xb0 net/bluetooth/hci_request.c:278 1 lock held by syz-executor.1/11753: #0: 00000000b62e2357 (&hdev->req_lock){+.+.}, at: hci_req_sync+0x69/0xb0 net/bluetooth/hci_request.c:278 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1560 Comm: khungtaskd Not tainted 4.19.171-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+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 10 Comm: rcu_preempt Not tainted 4.19.171-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:del_timer_sync+0x0/0x270 kernel/time/timer.c:1286 Code: 89 e0 5b 5d 41 5c 41 5d c3 41 bc ff ff ff ff eb b6 e8 84 b0 44 00 eb 91 e8 0d 4c e4 ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 <41> 54 55 53 48 89 fb e8 74 fa 0e 00 48 c7 c0 80 81 f1 89 48 ba 00 RSP: 0018:ffff8880b5a77c40 EFLAGS: 00000246 RAX: 0000000080000000 RBX: 00000001000028b4 RCX: 0000000000000000 RDX: 0000000000000004 RSI: 1ffff11016b4ef73 RDI: ffff8880b5a77cc0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b5a77cc0 R13: 1ffff11016b4ef8e R14: ffff8880ba022b00 R15: 00000000ffffffff FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff7c216cbd8 CR3: 00000000a16a2000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: schedule_timeout+0x4d7/0xfe0 kernel/time/timer.c:1819 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415