[libvirt-users] virsh hangs when backup jobs run on the kvm host

[Michal Prívozník]

On 3/3/19 4:23 AM, Zhan Adlun wrote:
> Hi,
>     Has anyone met the same problem that virsh hangs when there are some backup jobs running on the kvm host? I use dirty bitmap supported by qemu to do backups every 6 minitues. About a few hours later, I ran 'virsh list', It hung.  Then I stopped the backup jobs ，nothing was getting better. I had checked the libvirt logs ，but found nothing useful .
>     Maybe the high I/O caused the problem? or there are connection number limits when using virsh, because I use virsh to check the backup jobs are still running every 10 seconds?
>     My os version is ' Ubuntu 12.04 LTS   Release: 12.04   Codename: precise,Linux version 4.1.0-generic (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #1 SMP Wed Nov 9 02:04:23 CST 2016'. KVM version is 'QEMU emulator version 2.7.1(Debian 1:2.7+dfsg-3)'. Hoping for you reply. Thanks!


This sounds like a deadlock. If you can attach gdb to libvirtd once
virsh hangs and run 't a a bt' and share the output, that'd be great.

Michal