Bluetooth: hci4 command 0x0406 tx timeout Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout Bluetooth: hci0 command 0x0406 tx timeout INFO: task syz-executor.0:10127 blocked for more than 140 seconds. Not tainted 4.14.284-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D30032 10127 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 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:66 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 __get_super.part.0+0x271/0x390 fs/super.c:678 __get_super include/linux/spinlock.h:317 [inline] get_super+0x2b/0x50 fs/super.c:707 fsync_bdev+0x14/0xc0 fs/block_dev.c:495 blkdev_flushbuf block/ioctl.c:430 [inline] blkdev_ioctl+0x883/0x1830 block/ioctl.c:514 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: 0033:0x7fa6b4798109 RSP: 002b:00007fa6b30ec168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa6b48ab030 RCX: 00007fa6b4798109 RDX: 0000000000000000 RSI: 0000000000001261 RDI: 0000000000000003 RBP: 00007fa6b47f205d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc85ca022f R14: 00007fa6b30ec300 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 1 lock held by syz-executor.0/10127: #0: (&type->s_umount_key#58){.+.+}, at: [] __get_super.part.0+0x271/0x390 fs/super.c:678 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1528 Comm: khungtaskd Not tainted 4.14.284-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: 10117 Comm: syz-executor.0 Not tainted 4.14.284-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88805b6a4240 task.stack: ffff88808d5e0000 RIP: 0010:lock_page include/linux/pagemap.h:479 [inline] RIP: 0010:pagecache_get_page+0x466/0xab0 mm/filemap.c:1478 RSP: 0000:ffff88808d5e7748 EFLAGS: 00000246 RAX: ffffea000178fc40 RBX: 0000000000000007 RCX: ffffc90005bde000 RDX: 0000000000040000 RSI: ffffffff8168940b RDI: ffff88805b6a4264 RBP: 0000000001420848 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: ffff88805b6a4240 R12: ffffea000178fc40 R13: ffff88809071fb68 R14: dffffc0000000000 R15: 0000000000000100 FS: 00007fa6b310d700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4e24aeb000 CR3: 000000009b844000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: find_or_create_page include/linux/pagemap.h:326 [inline] grow_dev_page fs/buffer.c:1004 [inline] grow_buffers fs/buffer.c:1077 [inline] __getblk_slow+0x1dd/0x7a0 fs/buffer.c:1104 __getblk_gfp fs/buffer.c:1383 [inline] __bread_gfp+0x206/0x2e0 fs/buffer.c:1428 sb_bread include/linux/buffer_head.h:309 [inline] udf_tread+0xe1/0x130 fs/udf/misc.c:44 udf_read_tagged+0x40/0x4c0 fs/udf/misc.c:219 udf_check_anchor_block+0x18a/0x590 fs/udf/super.c:1823 udf_scan_anchors+0x3b9/0x530 fs/udf/super.c:1902 udf_find_anchor fs/udf/super.c:1920 [inline] udf_load_vrs+0x5a1/0xa90 fs/udf/super.c:1985 udf_fill_super+0x715/0x1660 fs/udf/super.c:2177 mount_bdev+0x2b3/0x360 fs/super.c:1134 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2572 [inline] do_mount+0xe65/0x2a30 fs/namespace.c:2905 SYSC_mount fs/namespace.c:3121 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3098 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fa6b4798109 RSP: 002b:00007fa6b310d168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa6b48aaf60 RCX: 00007fa6b4798109 RDX: 0000000020000040 RSI: 0000000020000280 RDI: 00000000200004c0 RBP: 00007fa6b47f205d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc85ca022f R14: 00007fa6b310d300 R15: 0000000000022000 Code: 85 88 05 00 00 49 8b 54 24 20 4c 89 e0 f6 c2 01 0f 85 15 04 00 00 48 89 44 24 18 e8 85 b2 ec ff 48 8b 44 24 18 f0 48 0f ba 28 00 <0f> 83 66 fc ff ff e8 6f b2 ec ff 4c 89 e7 e8 37 a7 ff ff e9 54 ---------------- Code disassembly (best guess): 0: 85 88 05 00 00 49 test %ecx,0x49000005(%rax) 6: 8b 54 24 20 mov 0x20(%rsp),%edx a: 4c 89 e0 mov %r12,%rax d: f6 c2 01 test $0x1,%dl 10: 0f 85 15 04 00 00 jne 0x42b 16: 48 89 44 24 18 mov %rax,0x18(%rsp) 1b: e8 85 b2 ec ff callq 0xffecb2a5 20: 48 8b 44 24 18 mov 0x18(%rsp),%rax 25: f0 48 0f ba 28 00 lock btsq $0x0,(%rax) * 2b: 0f 83 66 fc ff ff jae 0xfffffc97 <-- trapping instruction 31: e8 6f b2 ec ff callq 0xffecb2a5 36: 4c 89 e7 mov %r12,%rdi 39: e8 37 a7 ff ff callq 0xffffa775 3e: e9 .byte 0xe9 3f: 54 push %rsp