Bluetooth: hci3 command 0x0406 tx timeout Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci0 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout INFO: task syz-executor.0:9589 blocked for more than 140 seconds. Not tainted 4.14.259-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D27760 9589 7989 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 usb_start_wait_urb+0x125/0x440 drivers/usb/core/message.c:61 usb_bulk_msg+0x1f6/0x500 drivers/usb/core/message.c:252 proc_bulk+0x331/0x6d0 drivers/usb/core/devio.c:1223 usbdev_do_ioctl+0x5b0/0x2b70 drivers/usb/core/devio.c:2449 usbdev_ioctl+0x21/0x30 drivers/usb/core/devio.c:2599 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: 0033:0x7faf25b12e99 RSP: 002b:00007faf24488168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007faf25c25f60 RCX: 00007faf25b12e99 RDX: 0000000020000240 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 00007faf25b6cff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc248871f R14: 00007faf24488300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1526: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7708: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:778 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1526 Comm: khungtaskd Not tainted 4.14.259-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: 8 Comm: rcu_preempt Not tainted 4.14.259-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880b5420200 task.stack: ffff8880b5428000 RIP: 0010:rcu_read_lock_sched_held+0x7/0x1d0 kernel/rcu/update.c:106 RSP: 0018:ffff8880b542fbd0 EFLAGS: 00000097 RAX: ffffffff8a090584 RBX: ffff8880b542fd18 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff8880b5420a84 RBP: 0000000000000000 R08: ffffffff8b9c1430 R09: 0000000000000001 R10: 0000000000000000 R11: ffff8880b5420200 R12: ffff8880b32c98f0 R13: 0000000000000001 R14: ffff8880b542fd20 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f349e623000 CR3: 00000000ab91f000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_timer_cancel include/trace/events/timer.h:132 [inline] debug_deactivate kernel/time/timer.c:751 [inline] detach_timer kernel/time/timer.c:790 [inline] detach_if_pending+0x339/0x430 kernel/time/timer.c:809 try_to_del_timer_sync+0x9a/0xe0 kernel/time/timer.c:1181 del_timer_sync+0x17c/0x240 kernel/time/timer.c:1246 schedule_timeout+0x4b7/0xe90 kernel/time/timer.c:1748 rcu_gp_kthread+0xc0a/0x1e60 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: e9 6e ff ff ff 48 c7 c7 20 1e 3d 89 e8 53 bb 38 00 eb 94 90 e9 eb fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 48 c7 c0 84 05 09 8a <55> 48 ba 00 00 00 00 00 fc ff df 48 89 c1 53 83 e0 07 48 c1 e9 ---------------- Code disassembly (best guess): 0: e9 6e ff ff ff jmpq 0xffffff73 5: 48 c7 c7 20 1e 3d 89 mov $0xffffffff893d1e20,%rdi c: e8 53 bb 38 00 callq 0x38bb64 11: eb 94 jmp 0xffffffa7 13: 90 nop 14: e9 eb fe ff ff jmpq 0xffffff04 19: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 20: 00 00 00 00 24: 48 c7 c0 84 05 09 8a mov $0xffffffff8a090584,%rax * 2b: 55 push %rbp <-- trapping instruction 2c: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 33: fc ff df 36: 48 89 c1 mov %rax,%rcx 39: 53 push %rbx 3a: 83 e0 07 and $0x7,%eax 3d: 48 rex.W 3e: c1 .byte 0xc1 3f: e9 .byte 0xe9