Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci3 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.4:9738 blocked for more than 140 seconds. Not tainted 4.14.280-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27968 9738 7997 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_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 __blkdev_get+0x6a9/0x1090 fs/block_dev.c:1515 blkdev_get+0x88/0x890 fs/block_dev.c:1611 blkdev_open+0x1cc/0x250 fs/block_dev.c:1772 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f4d2c1330e9 RSP: 002b:00007f4d2aa87168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f4d2c246030 RCX: 00007f4d2c1330e9 RDX: 0000000000000018 RSI: 0000000020004280 RDI: ffffffffffffff9c RBP: 00007f4d2c18d08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd1d19a42f R14: 00007f4d2aa87300 R15: 0000000000022000 INFO: task syz-executor.1:9733 blocked for more than 140 seconds. Not tainted 4.14.280-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D25480 9733 7996 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_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 blkdev_get+0x88/0x890 fs/block_dev.c:1611 blkdev_open+0x1cc/0x250 fs/block_dev.c:1772 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f9d2d7770e9 RSP: 002b:00007f9d2c0cb168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f9d2d88a030 RCX: 00007f9d2d7770e9 RDX: 0000000000000018 RSI: 0000000020004280 RDI: ffffffffffffff9c RBP: 00007f9d2d7d108d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcee00dbdf R14: 00007f9d2c0cb300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1528: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 2 locks held by syz-executor.4/9738: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 #1: (&bdev->bd_mutex/1){+.+.}, at: [] __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 1 lock held by syz-executor.1/9733: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 fs/block_dev.c:1455 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1528 Comm: khungtaskd Not tainted 4.14.280-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: 4620 Comm: systemd-journal Not tainted 4.14.280-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a1486000 task.stack: ffff8880a1490000 RIP: 0010:__orc_find+0x11/0xf0 arch/x86/kernel/unwind_orc.c:32 RSP: 0018:ffff8880a1497788 EFLAGS: 00000212 RAX: 0000000000000008 RBX: 1ffff11014292eff RCX: ffffffff817eb620 RDX: 0000000000000008 RSI: ffffffff8a729386 RDI: ffffffff8a197574 RBP: 0000000000000001 R08: ffffffff8a729386 R09: ffffffff8a7293b6 R10: 000000000001e639 R11: 0000000000066071 R12: ffffffff8a197590 R13: ffff8880a14978b8 R14: ffff8880a14978d0 R15: ffff8880a1497880 FS: 00007efd744978c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efd718b1018 CR3: 00000000a15c9000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: orc_find arch/x86/kernel/unwind_orc.c:118 [inline] unwind_next_frame+0x59a/0x17d0 arch/x86/kernel/unwind_orc.c:348 __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x111/0x3c0 mm/slab.c:3550 kmem_cache_zalloc include/linux/slab.h:651 [inline] get_empty_filp+0x86/0x3f0 fs/file_table.c:123 path_openat+0x84/0x2970 fs/namei.c:3545 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7efd73a26840 RSP: 002b:00007fffda351648 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fffda351950 RCX: 00007efd73a26840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005633be2654c0 RBP: 000000000000000d R08: 00000000000001e0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 00005633be257040 R14: 00007fffda351910 R15: 00005633be2650c0 Code: 8b 44 24 14 44 8b 44 24 08 e9 d8 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 41 57 89 d0 41 56 41 55 41 54 4c 8d 64 87 fc 55 53 <48> 83 ec 10 85 d2 0f 84 95 00 00 00 4c 39 e7 49 89 fd 0f 87 9a ---------------- Code disassembly (best guess): 0: 8b 44 24 14 mov 0x14(%rsp),%eax 4: 44 8b 44 24 08 mov 0x8(%rsp),%r8d 9: e9 d8 fe ff ff jmpq 0xfffffee6 e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 41 57 push %r15 1c: 89 d0 mov %edx,%eax 1e: 41 56 push %r14 20: 41 55 push %r13 22: 41 54 push %r12 24: 4c 8d 64 87 fc lea -0x4(%rdi,%rax,4),%r12 29: 55 push %rbp 2a: 53 push %rbx * 2b: 48 83 ec 10 sub $0x10,%rsp <-- trapping instruction 2f: 85 d2 test %edx,%edx 31: 0f 84 95 00 00 00 je 0xcc 37: 4c 39 e7 cmp %r12,%rdi 3a: 49 89 fd mov %rdi,%r13 3d: 0f .byte 0xf 3e: 87 .byte 0x87 3f: 9a (bad)