when guest unexpect shutdown,can't enter system,the terminal has a black screen
Description of problem:

Steps to reproduce:
1.guest unexpect shutdown 

2.when start again,cpu usage is high and can't enter the guest system

3.restart guest can recovery

**libvirt print：**

`2022-08-11 14:39:58.080+0000: 1942: warning : qemuDomainObjTaint:6079 : Domain id=117 name='GDT99d2578e-f06e-4fbe-88dd-7d9dd56fd02d' uuid=99d2578e-f06e-4fbe-88dd-7d9dd56fd02d is tainted: high-privileges

2022-08-11 14:39:58.080+0000: 1942: warning : qemuDomainObjTaint:6079 : Domain id=117 name='GDT99d2578e-f06e-4fbe-88dd-7d9dd56fd02d' uuid=99d2578e-f06e-4fbe-88dd-7d9dd56fd02d is tainted: custom-argv

2022-08-11 14:40:28.792+0000: 741037: warning : qemuDomainObjBeginJobInternal:946 : Cannot start job (modify, none, none) for domain GDT99d2578e-f06e-4fbe-88dd-7d9dd56fd02d; current job is (none, none, migration in) owned by (0 <null>, 0 <null>, 0 remoteDispatchDomainMigratePrepare3Params (flags=0x203)) for (0s, 0s, 30s)

2022-08-11 14:40:28.792+0000: 741037: error : qemuDomainObjBeginJobInternal:968 : Timed out during operation: cannot acquire state change lock (held by monitor=remoteDispatchDomainMigratePrepare3Params)
`


**user perf to analyse:**

\#top -d 3 -Hp 1311519

![image](/uploads/2ec511a049b43f827368eb84c46ee2ed/image.png)

\#perf record -a -g -p 1311519 sleep 20

\#report -n --header --stdio

![image](/uploads/b8c66c590e4b1d444d102923f6247dce/image.png)


**query kvm stat:**

 \# perf stat -e 'kvm:*' -a -p 1311519 sleep 20

![image](/uploads/6d50e1b48d795fe68bfebb05b7382a24/image.png)


kvm vmexit stat:

\#perf kvm stat record -a -p 1311519 sleep 10

\#perf kvm stat report --event=vmexit

![image](/uploads/3f7f0c35f8734ccebcdf883cb059f12c/image.png)