Bluetooth: hci3 command 0x0406 tx timeout Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout Bluetooth: hci0 command 0x0406 tx timeout INFO: task syz-executor.5:12532 blocked for more than 140 seconds. Not tainted 4.14.262-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28776 12532 8008 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_workqueue+0x3ce/0x1310 kernel/workqueue.c:2677 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: 0033:0x7f4c6a90ffe9 RSP: 002b:00007f4c69285168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4c6aa22f60 RCX: 00007f4c6a90ffe9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 RBP: 00007f4c6a96a08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdf09ec5ef R14: 00007f4c69285300 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/7703: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:778 3 locks held by kworker/u5:5/8048: #0: ("knbd%d-recv"nbd->index){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((&args->work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 #2: (sk_lock-AF_AX25){+.+.}, at: [] lock_sock include/net/sock.h:1473 [inline] #2: (sk_lock-AF_AX25){+.+.}, at: [] ax25_recvmsg+0xa8/0x7a0 net/ax25/af_ax25.c:1632 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1534 Comm: khungtaskd Not tainted 4.14.262-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: 7986 Comm: syz-fuzzer Not tainted 4.14.262-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880b365a0c0 task.stack: ffff8880b3018000 RIP: 0010:accumulate_sum kernel/sched/fair.c:2949 [inline] RIP: 0010:___update_load_avg kernel/sched/fair.c:3034 [inline] RIP: 0010:__update_load_avg_se.constprop.0.isra.0+0x188/0x690 kernel/sched/fair.c:3059 RSP: 0018:ffff8880b301f9c0 EFLAGS: 00000093 RAX: 0000000000000007 RBX: ffff8880b365a140 RCX: 1ffffffff127a3c4 RDX: 000000000000036a RSI: 0000000000000000 RDI: ffff8880b365a2d4 RBP: ffff8880b301fa28 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: ffff8880b365a0c0 R12: 0000000000000048 R13: 0000000000000400 R14: 00000000000003b2 R15: 00000000000003b2 FS: 000000c00002e490(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbd7b8f7000 CR3: 00000000abc39000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: update_load_avg kernel/sched/fair.c:3424 [inline] dequeue_entity+0x198/0x2150 kernel/sched/fair.c:3815 dequeue_task_fair+0x5c/0x12a0 kernel/sched/fair.c:4959 __schedule+0x2b1/0x1de0 kernel/sched/core.c:3336 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_hrtimeout_range_clock+0x156/0x320 kernel/time/hrtimer.c:1719 ep_poll+0x85e/0xa50 fs/eventpoll.c:1827 SYSC_epoll_wait fs/eventpoll.c:2195 [inline] SyS_epoll_wait+0x150/0x1a0 fs/eventpoll.c:2160 SYSC_epoll_pwait fs/eventpoll.c:2226 [inline] SyS_epoll_pwait+0x1e9/0x230 fs/eventpoll.c:2206 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x46e460 RSP: 002b:000000c00003f7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000046e460 RDX: 0000000000000080 RSI: 000000c00003f840 RDI: 0000000000000003 RBP: 000000c00003fe40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000003 R13: 000000c000000900 R14: 000080c025800000 R15: 000000c025fb2070 Code: 41 5c 41 5d 41 5e 41 5f 5d c3 4c 39 fb 41 0f 94 c1 49 81 fe ff 03 00 00 0f 87 4c 01 00 00 45 89 e4 45 89 f7 44 89 b3 94 01 00 00 <4c> 8d 83 88 01 00 00 45 89 e6 48 b8 00 00 00 00 00 fc ff df 4c ---------------- Code disassembly (best guess): 0: 41 5c pop %r12 2: 41 5d pop %r13 4: 41 5e pop %r14 6: 41 5f pop %r15 8: 5d pop %rbp 9: c3 retq a: 4c 39 fb cmp %r15,%rbx d: 41 0f 94 c1 sete %r9b 11: 49 81 fe ff 03 00 00 cmp $0x3ff,%r14 18: 0f 87 4c 01 00 00 ja 0x16a 1e: 45 89 e4 mov %r12d,%r12d 21: 45 89 f7 mov %r14d,%r15d 24: 44 89 b3 94 01 00 00 mov %r14d,0x194(%rbx) * 2b: 4c 8d 83 88 01 00 00 lea 0x188(%rbx),%r8 <-- trapping instruction 32: 45 89 e6 mov %r12d,%r14d 35: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 3c: fc ff df 3f: 4c rex.WR