Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci0 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout INFO: task syz-executor.2:12497 blocked for more than 140 seconds. Not tainted 4.14.287-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D30040 12497 7986 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_thawed+0x13b/0x380 fs/super.c:715 quotactl_block fs/quota/quota.c:820 [inline] SYSC_quotactl fs/quota/quota.c:874 [inline] SyS_quotactl+0x167/0x10a0 fs/quota/quota.c:839 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f110fd33109 RSP: 002b:00007f110e687168 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 00007f110fe46030 RCX: 00007f110fd33109 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007f110fd8d05d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd3482c19f R14: 00007f110e687300 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 syz-executor.2/12497: #0: (&type->s_umount_key#78){.+.+}, at: [] __get_super.part.0+0x271/0x390 fs/super.c:678 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1534 Comm: khungtaskd Not tainted 4.14.287-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 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: 12493 Comm: syz-executor.2 Not tainted 4.14.287-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 task: ffff88809be4e680 task.stack: ffff88808c0d8000 RIP: 0010:__lock_acquire+0x889/0x3f20 kernel/locking/lockdep.c:3503 RSP: 0018:ffff88808c0df458 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 9bd14d8ddfc26278 RCX: 18cfdd155c48168c RDX: 1ffff110137c9ddf RSI: 0000000000000001 RDI: ffff88809be4ef51 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000020011 R10: ffff88809be4ef30 R11: ffff88809be4e680 R12: ffff88809be4ef48 R13: 0000000000000000 R14: 18cfdd155c48168c R15: ffffffff8beccd80 FS: 00007f110e6a8700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6fa2c9b110 CR3: 00000000a96bf000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:629 [inline] find_get_entry+0x45/0x630 mm/filemap.c:1352 pagecache_get_page+0x53/0xab0 mm/filemap.c:1465 find_get_page_flags include/linux/pagemap.h:282 [inline] __find_get_block_slow fs/buffer.c:214 [inline] __find_get_block+0x4cc/0xc40 fs/buffer.c:1357 __getblk_slow+0x127/0x7a0 fs/buffer.c:1100 __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+0x16d/0x530 fs/udf/super.c:1863 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: 0033:0x7f110fd33109 RSP: 002b:00007f110e6a8168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f110fe45f60 RCX: 00007f110fd33109 RDX: 0000000020000040 RSI: 0000000020000280 RDI: 00000000200004c0 RBP: 00007f110fd8d05d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd3482c19f R14: 00007f110e6a8300 R15: 0000000000022000 Code: 8b 35 2c a7 fb 07 85 f6 0f 84 12 f9 ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 20 48 c1 ea 03 80 3c 02 00 0f 85 aa 26 00 00 <48> 8b 54 24 18 4d 89 b3 78 08 00 00 48 b8 00 00 00 00 00 fc ff ---------------- Code disassembly (best guess): 0: 8b 35 2c a7 fb 07 mov 0x7fba72c(%rip),%esi # 0x7fba732 6: 85 f6 test %esi,%esi 8: 0f 84 12 f9 ff ff je 0xfffff920 e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 15: fc ff df 18: 48 8b 54 24 20 mov 0x20(%rsp),%rdx 1d: 48 c1 ea 03 shr $0x3,%rdx 21: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 25: 0f 85 aa 26 00 00 jne 0x26d5 * 2b: 48 8b 54 24 18 mov 0x18(%rsp),%rdx <-- trapping instruction 30: 4d 89 b3 78 08 00 00 mov %r14,0x878(%r11) 37: 48 rex.W 38: b8 00 00 00 00 mov $0x0,%eax 3d: 00 fc add %bh,%ah 3f: ff .byte 0xff