Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout INFO: task syz-executor.3:10014 blocked for more than 140 seconds. Not tainted 4.14.257-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28696 10014 7985 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: 0033:0x7f4db71cfe99 RSP: 002b:00007f4db5b45168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4db72e2f60 RCX: 00007f4db71cfe99 RDX: 00000000200000c0 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 00007f4db722a031 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff3f80650f R14: 00007f4db5b45300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.257-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: 7670 Comm: rs:main Q:Reg Not tainted 4.14.257-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888093b8e600 task.stack: ffff8880b0a68000 RIP: 0010:generic_write_end+0x0/0x360 fs/buffer.c:2198 RSP: 0018:ffff8880b0a6fa58 EFLAGS: 00000297 RAX: ffff888093b8e600 RBX: ffff88804a1c31f8 RCX: 0000000000000289 RDX: 0000000000042d77 RSI: ffff88808fdf3b80 RDI: ffff8880ab937cc0 RBP: ffff88808fdf3970 R08: 0000000000000289 R09: ffffea00014a36c0 R10: ffff8880528dbfff R11: 0000000000000000 R12: 0000000000000289 R13: 0000000000042d77 R14: 0000000000000289 R15: 0000000000000289 FS: 00007fa34571a700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007faf21275008 CR3: 00000000b3454000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_da_write_end+0x50c/0x8e0 fs/ext4/inode.c:3208 generic_perform_write+0x268/0x420 mm/filemap.c:3066 __generic_file_write_iter+0x227/0x590 mm/filemap.c:3180 ext4_file_write_iter+0x276/0xd20 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1780 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44c/0x630 fs/read_write.c:482 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fa34815e1cd RSP: 002b:00007fa345719590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa33c022050 RCX: 00007fa34815e1cd RDX: 00000000000004a6 RSI: 00007fa33c022050 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fa33c021dd0 R13: 00007fa3457195b0 R14: 0000561ec5a8c360 R15: 00000000000004a6 Code: 89 ef 45 31 e4 eb de e8 5f 7a c2 ff 49 8d 5f ff eb a6 e8 34 29 ec ff eb 92 48 89 df e8 2a 29 ec ff eb b1 0f 1f 84 00 00 00 00 00 <41> 57 41 56 41 55 49 89 f5 41 54 49 89 d4 55 4c 89 cd 53 48 83 ---------------- Code disassembly (best guess): 0: 89 ef mov %ebp,%edi 2: 45 31 e4 xor %r12d,%r12d 5: eb de jmp 0xffffffe5 7: e8 5f 7a c2 ff callq 0xffc27a6b c: 49 8d 5f ff lea -0x1(%r15),%rbx 10: eb a6 jmp 0xffffffb8 12: e8 34 29 ec ff callq 0xffec294b 17: eb 92 jmp 0xffffffab 19: 48 89 df mov %rbx,%rdi 1c: e8 2a 29 ec ff callq 0xffec294b 21: eb b1 jmp 0xffffffd4 23: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 2a: 00 * 2b: 41 57 push %r15 <-- trapping instruction 2d: 41 56 push %r14 2f: 41 55 push %r13 31: 49 89 f5 mov %rsi,%r13 34: 41 54 push %r12 36: 49 89 d4 mov %rdx,%r12 39: 55 push %rbp 3a: 4c 89 cd mov %r9,%rbp 3d: 53 push %rbx 3e: 48 rex.W 3f: 83 .byte 0x83