Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout Bluetooth: hci4 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout INFO: task syz-executor.2:9361 blocked for more than 140 seconds. Not tainted 4.14.229-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28200 9361 7996 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x343/0x6d0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 grab_super+0x55/0x140 fs/super.c:373 sget_userns+0x2b1/0xc10 fs/super.c:504 sget+0xd1/0x110 fs/super.c:572 mount_bdev+0xcd/0x360 fs/super.c:1107 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:2549 [inline] do_mount+0xe53/0x2a00 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x46797a RSP: 002b:00007fac6bb7efa8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020004280 RCX: 000000000046797a RDX: 0000000020003e80 RSI: 0000000020003ec0 RDI: 00007fac6bb7f000 RBP: 00007fac6bb7f040 R08: 00007fac6bb7f040 R09: 0000000020003e80 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020003e80 R13: 0000000020003ec0 R14: 00007fac6bb7f000 R15: 0000000020004480 Showing all locks held in the system: 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 2 locks held by syz-executor.2/9361: #0: (&bdev->bd_fsfreeze_mutex){+.+.}, at: [] mount_bdev+0x71/0x360 fs/super.c:1101 #1: (&type->s_umount_key#51){+.+.}, at: [] grab_super+0x55/0x140 fs/super.c:373 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.229-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: 9345 Comm: syz-executor.2 Not tainted 4.14.229-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809607a5c0 task.stack: ffff888048138000 RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1188 [inline] RIP: 0010:rcu_lockdep_current_cpu_online+0x88/0x140 kernel/rcu/tree.c:1177 RSP: 0018:ffff88804813fa98 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff8880ba42b200 RCX: 1ffffffff11985ac RDX: 1ffff11017485644 RSI: ffffffff83197b35 RDI: ffff8880ba42b220 RBP: 0000000001420848 R08: 0000000000000000 R09: 0000000000020012 R10: ffff88809607ae70 R11: ffff88809607a5c0 R12: 0000000000000001 R13: ffff8880902cfb68 R14: dffffc0000000000 R15: 0000000000000002 FS: 00007fac6bba0700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5905c19008 CR3: 000000009662c000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_lock_held+0xc3/0x110 kernel/rcu/update.c:330 radix_tree_deref_slot include/linux/radix-tree.h:238 [inline] find_get_entry+0x357/0x630 mm/filemap.c:1357 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] sysv_fill_super+0x192/0x710 fs/sysv/super.c:378 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:2549 [inline] do_mount+0xe53/0x2a00 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x466459 RSP: 002b:00007fac6bba0188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000020001ac0 RSI: 0000000020001a80 RDI: 0000000020001a40 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000010 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd1f06a13f R14: 00007fac6bba0300 R15: 0000000000022000 Code: a5 00 00 00 48 03 1c c5 60 2d cc 88 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 20 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 90 00 00 00 <48> 8d 7b 28 4c 8b 63 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa