virsh_check_blockjob.md

[root@mytest-server:/root]
#virsh list
 Id    Name                           State
----------------------------------------------------
 11    io_vm_219003                   shut off


[root@mytest-server:/root]
#virsh start io_vm_219003
error: Domain is already active

ps aux | grep io_vm_2019003 可以看到实际上/usr/bin/qemu-kvm -name io_vm_219003 ...是运行状态

尝试关闭虚拟机发现有锁导致超时

#virsh destroy io_vm_219003

error: Failed to destroy domain io_vm_219003
error: Timed out during operation: cannot acquire state change lock

libvirtd日志显示：

2018-04-23 15:35:10.000+0000| 3571| warning | qemuDomainObjBeginJobInternalCore:1254 | Cannot start job (modify, none) for domain io_vm_219003; current job is (modify, none) owned by (3568, 0)
2018-04-23 15:35:10.000+0000| 3571| error | qemuDomainObjBeginJobInternalCore:1259 | Timed out during operation: cannot acquire state change lock

可以看到当前任务是 3568

    blockjob                       Manage active block operations
    domjobabort                    abort active domain job
    domjobinfo                     domain job information

参考 domain has active block job 检查块设备是否有活动操作：

首先检查实例有哪些块设备

virsh domblklist io_vm_219003

输出如下：

Target     Source
------------------------------------------------
vda        /diskspool/disk3/kvm_vm_img/io_vm_219003.raw
...

然后检查是否磁盘设备有活跃块操作

virsh blockjob io_vm_219003 /diskspool/disk3/kvm_vm_img/io_vm_219003.raw --info

但是显示超时：

error: Timed out during operation: cannot acquire state change lock

最后排查原因是，最初用户kill -9杀掉qemu进程后，qemu没有发送close给后端分布式存储关闭磁盘引发的再次启动无法使用磁盘。