Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci5 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.2:9642 blocked for more than 140 seconds. Not tainted 4.14.281-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27928 9642 8003 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:898 [inline] p9_fd_close+0x28d/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+0xe65/0x2a30 fs/namespace.c:2905 SYSC_mount fs/namespace.c:3121 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3098 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f5e8155a109 RSP: 002b:00007f5e7fe8d168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f5e8166d100 RCX: 00007f5e8155a109 RDX: 0000000020000080 RSI: 0000000020000300 RDI: 0000000000000000 RBP: 00007f5e815b408d R08: 0000000020000740 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffeb667c5af R14: 00007f5e7fe8d300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1532: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 2 locks held by kworker/0:2/3626: #0: ("events"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((&m->rq)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1532 Comm: khungtaskd Not tainted 4.14.281-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: 4625 Comm: systemd-journal Not tainted 4.14.281-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a112e180 task.stack: ffff8880a1130000 RIP: 0010:___bpf_prog_run+0xa5/0x5a70 kernel/bpf/core.c:1004 RSP: 0018:ffff8880a1137a48 EFLAGS: 00000246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 000000007fff0000 RDX: 0000000000000000 RSI: ffffc90001a59030 RDI: ffffffff878f1198 RBP: ffff8880a1137b58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff878f0c20 R13: 1ffff11014226f50 R14: ffffc90001a59030 R15: 00000000000000af FS: 00007f54a039f8c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f549d7ad000 CR3: 00000000a11bd000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: Code: f6 ff 4c 89 f0 4c 89 f2 48 c1 e8 03 83 e2 07 0f b6 04 18 38 d0 7f 08 84 c0 0f 85 10 42 00 00 45 0f b6 3e 4a 8d 3c fd 20 0c 8f 87 <48> 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 ea 41 00 00 43 ff 24 fc ---------------- Code disassembly (best guess): 0: f6 ff idiv %bh 2: 4c 89 f0 mov %r14,%rax 5: 4c 89 f2 mov %r14,%rdx 8: 48 c1 e8 03 shr $0x3,%rax c: 83 e2 07 and $0x7,%edx f: 0f b6 04 18 movzbl (%rax,%rbx,1),%eax 13: 38 d0 cmp %dl,%al 15: 7f 08 jg 0x1f 17: 84 c0 test %al,%al 19: 0f 85 10 42 00 00 jne 0x422f 1f: 45 0f b6 3e movzbl (%r14),%r15d 23: 4a 8d 3c fd 20 0c 8f lea -0x7870f3e0(,%r15,8),%rdi 2a: 87 * 2b: 48 89 f8 mov %rdi,%rax <-- trapping instruction 2e: 48 c1 e8 03 shr $0x3,%rax 32: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 36: 0f 85 ea 41 00 00 jne 0x4226 3c: 43 ff 24 fc jmpq *(%r12,%r15,8)