Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout Bluetooth: hci0 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout INFO: task syz-executor.0:13994 blocked for more than 140 seconds. Not tainted 4.14.228-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28296 13994 10929 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 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_workqueue+0x3ce/0x1310 kernel/workqueue.c:2676 nbd_start_device_ioctl drivers/block/nbd.c:1263 [inline] __nbd_ioctl drivers/block/nbd.c:1334 [inline] nbd_ioctl+0x49d/0xa80 drivers/block/nbd.c:1374 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x540/0x1830 block/ioctl.c:594 block_ioctl+0xd9/0x120 fs/block_dev.c:1893 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: 0033:0x466459 RSP: 002b:00007f79d1175188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffe61ab7e4f R14: 00007f79d1175300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1534: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7695: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:769 2 locks held by agetty/7718: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e3/0x1680 drivers/tty/n_tty.c:2156 3 locks held by kworker/u5:5/8018: #0: ("knbd%d-recv"nbd->index){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #1: ((&args->work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 #2: (sk_lock-AF_AX25){+.+.}, at: [] lock_sock include/net/sock.h:1471 [inline] #2: (sk_lock-AF_AX25){+.+.}, at: [] ax25_recvmsg+0xa8/0x7a0 net/ax25/af_ax25.c:1630 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1534 Comm: khungtaskd Not tainted 4.14.228-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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4623 Comm: systemd-journal Not tainted 4.14.228-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a10a4100 task.stack: ffff8880a10a8000 RIP: 0010:__might_sleep+0x2a/0xb0 kernel/sched/core.c:5984 RSP: 0018:ffff8880a10afdc8 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff8880a10a4100 RCX: 1ffff11014214931 RDX: 0000000000000000 RSI: 00000000000001a3 RDI: ffff8880a10a4110 RBP: ffffffff88b6a12b R08: ffffffff8b9950c8 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8880a10a4100 R12: 00000000000001a3 R13: 0000000000000000 R14: 00000000ffffff9c R15: 000055aa214a29a3 FS: 00007fe0b0db28c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe0ae2bc000 CR3: 00000000a1704000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: slab_pre_alloc_hook mm/slab.h:419 [inline] slab_alloc mm/slab.c:3376 [inline] kmem_cache_alloc+0x284/0x3c0 mm/slab.c:3550 prepare_creds+0x39/0x490 kernel/cred.c:255 SYSC_faccessat fs/open.c:365 [inline] SyS_faccessat+0x7b/0x680 fs/open.c:353 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fe0b006d9c7 RSP: 002b:00007fff54ea9bb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007fff54eacad0 RCX: 00007fe0b006d9c7 RDX: 00007fe0b0adea00 RSI: 0000000000000000 RDI: 000055aa214a29a3 RBP: 00007fff54ea9bf0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fff54eacad0 R15: 00007fff54eaa0e0 Code: 00 48 b8 00 00 00 00 00 fc ff df 41 57 41 56 41 55 41 89 d5 41 54 41 89 f4 55 48 89 fd 53 65 48 8b 1c 25 80 df 01 00 48 8d 7b 10 <48> 89 fa 48 c1 ea 03 80 3c 02 00 75 62 48 8b 43 10 48 85 c0 74