Bluetooth: hci5 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout Bluetooth: hci0 command 0x0406 tx timeout Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout INFO: task syz-executor.1:13731 blocked for more than 140 seconds. Not tainted 4.14.256-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28968 13731 8001 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 __cancel_work_timer+0x321/0x460 kernel/workqueue.c:2965 p9_conn_destroy net/9p/trans_fd.c:899 [inline] p9_fd_close+0x299/0x420 net/9p/trans_fd.c:925 p9_client_create+0x736/0x12c0 net/9p/client.c:1095 v9fs_session_init+0x1c5/0x1540 fs/9p/v9fs.c:422 v9fs_mount+0x73/0x860 fs/9p/vfs_super.c:135 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: 0033:0x7f37f7cc5ae9 RSP: 002b:00007f37f6c1a188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f37f7dd9028 RCX: 00007f37f7cc5ae9 RDX: 0000000020000040 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007f37f7d1fff7 R08: 00000000200001c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc1fb798af R14: 00007f37f6c1a300 R15: 0000000000022000 Showing all locks held in the system: 2 locks held by kworker/1:1/23: #0: ("events"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((&m->wq)){+.+.}, 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 1 lock held by in:imklog/7696: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:769 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.256-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: 0 Comm: swapper/0 Not tainted 4.14.256-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffffffff88e74440 task.stack: ffffffff88e00000 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] RIP: 0010:read_seqcount_begin include/linux/seqlock.h:164 [inline] RIP: 0010:ktime_get+0x110/0x2c0 kernel/time/timekeeping.c:760 RSP: 0018:ffffffff88e07e18 EFLAGS: 00000097 RAX: ffffffff88e74440 RBX: 0000000000000097 RCX: 1ffffffff11ce999 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000097 RBP: fffffbfff11e1278 R08: ffffffff8b9cf858 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff88e74440 R12: dffffc0000000000 R13: 1ffffffff11e127a R14: ffffffff88e74440 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f071032f000 CR3: 00000000a98a0000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tick_nohz_idle_exit+0x1bc/0x7d0 kernel/time/tick-sched.c:1097 do_idle+0x10f/0x3c0 kernel/sched/idle.c:258 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:351 start_kernel+0x750/0x770 init/main.c:708 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 Code: c8 93 f0 88 48 c1 e8 03 42 80 3c 20 00 0f 85 97 01 00 00 48 83 3d d8 6c a7 07 00 0f 84 4c 01 00 00 e8 05 14 0c 00 48 89 df 57 9d <0f> 1f 44 00 00 e8 d6 df f7 ff e8 f1 13 0c 00 44 8b 35 2a 19 af ---------------- Code disassembly (best guess): 0: c8 93 f0 88 enterq $0xf093,$0x88 4: 48 c1 e8 03 shr $0x3,%rax 8: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) d: 0f 85 97 01 00 00 jne 0x1aa 13: 48 83 3d d8 6c a7 07 cmpq $0x0,0x7a76cd8(%rip) # 0x7a76cf3 1a: 00 1b: 0f 84 4c 01 00 00 je 0x16d 21: e8 05 14 0c 00 callq 0xc142b 26: 48 89 df mov %rbx,%rdi 29: 57 push %rdi 2a: 9d popfq * 2b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction 30: e8 d6 df f7 ff callq 0xfff7e00b 35: e8 f1 13 0c 00 callq 0xc142b 3a: 44 rex.R 3b: 8b .byte 0x8b 3c: 35 .byte 0x35 3d: 2a 19 sub (%rcx),%bl 3f: af scas %es:(%rdi),%eax