Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout INFO: task syz-executor.0:11621 blocked for more than 140 seconds. Not tainted 4.14.276-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29992 11621 8002 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: 0033:0x7f75777150e9 RSP: 002b:00007f7576069168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7577828030 RCX: 00007f75777150e9 RDX: 0000000000000000 RSI: 0000000000001261 RDI: 0000000000000003 RBP: 00007f757776f08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffacf1268f R14: 00007f7576069300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1522: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by syz-executor.0/11621: #0: (&type->s_umount_key#68){.+.+}, at: [] __get_super.part.0+0x271/0x390 fs/super.c:678 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1522 Comm: khungtaskd Not tainted 4.14.276-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: 11612 Comm: syz-executor.0 Not tainted 4.14.276-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880976ce1c0 task.stack: ffff88808ee40000 RIP: 0010:check_preemption_disabled+0x10/0x240 lib/smp_processor_id.c:14 RSP: 0018:ffff88808ee476a0 EFLAGS: 00000246 RAX: 0000000000040000 RBX: ffff8880a4c15b68 RCX: ffffc90005c16000 RDX: 0000000000040000 RSI: ffffffff87ccff40 RDI: ffffffff87ccff80 RBP: ffffffff87ccff80 R08: 0000000000000000 R09: 0000000000020012 R10: ffff8880976cea70 R11: ffff8880976ce1c0 R12: 0000000000000200 R13: ffffffff87ccff40 R14: dffffc0000000000 R15: 0000000000000011 FS: 00007f757608a700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5afde6b000 CR3: 00000000b0b71000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:360 [inline] rcu_is_watching+0x11/0xb0 kernel/rcu/tree.c:1130 rcu_read_lock include/linux/rcupdate.h:630 [inline] find_get_entry+0x3a9/0x630 mm/filemap.c:1352 pagecache_get_page+0x53/0xab0 mm/filemap.c:1465 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+0x321/0x530 fs/udf/super.c:1885 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+0xe65/0x2a10 fs/namespace.c:2902 SYSC_mount fs/namespace.c:3118 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3095 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f75777150e9 RSP: 002b:00007f757608a168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f7577827f60 RCX: 00007f75777150e9 RDX: 0000000020000080 RSI: 0000000020000280 RDI: 00000000200004c0 RBP: 00007f757776f08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffacf1268f R14: 00007f757608a300 R15: 0000000000022000 Code: fe e9 e5 f9 ff ff e8 e0 02 65 fe e9 b0 fd ff ff 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 41 55 49 89 f5 41 54 55 48 89 fd 53 eb 4c 3b fe 65 44 8b 25 73 27 e8 7c 65 8b 05 8c 85 e8 7c a9 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e9 e5 f9 ff ff jmpq 0xfffff9ea 5: e8 e0 02 65 fe callq 0xfe6502ea a: e9 b0 fd ff ff jmpq 0xfffffdbf 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: 41 56 push %r14 1e: 41 55 push %r13 20: 49 89 f5 mov %rsi,%r13 23: 41 54 push %r12 25: 55 push %rbp 26: 48 89 fd mov %rdi,%rbp 29: 53 push %rbx * 2a: e8 eb 4c 3b fe callq 0xfe3b4d1a <-- trapping instruction 2f: 65 44 8b 25 73 27 e8 mov %gs:0x7ce82773(%rip),%r12d # 0x7ce827aa 36: 7c 37: 65 8b 05 8c 85 e8 7c mov %gs:0x7ce8858c(%rip),%eax # 0x7ce885ca 3e: a9 .byte 0xa9