Re: [BUG] libvirtd on destination crash frequently while migrating vms concurrently

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Thanks a lot, I'll have a try.

> -----Original Message-----
> From: Michal Privoznik [mailto:mprivozn@xxxxxxxxxx]
> Sent: Friday, October 11, 2013 8:58 PM
> To: Wangyufei (A)
> Cc: libvir-list@xxxxxxxxxx; jdenemar@xxxxxxxxxx; Wangrui (K)
> Subject: Re:  [BUG] libvirtd on destination crash frequently while
> migrating vms concurrently
> 
> On 27.09.2013 09:55, Wangyufei (A) wrote:
> > Hello,
> > I found a problem that libvirtd on destination crash frequently while
> > migrating vms concurrently. For example, if I migrate 10 vms
> > concurrently ceaselessly, then after about 30 minutes the libvirtd on
> > destination will crash. So I analyzed and found two bugs during
> > migration process.
> > First, during migration prepare phase on destination, libvirtd assigns
> > ports to qemu to be startd on destination. But the port increase
> > operation is not aomic, so there's a chance that multi vms get the same
> > port, and only the first one can start successfully, others will fail to
> > start. I've applied a patch to solve this bug, and I test it, it works
> > well. If only this bug exists, libvirtd will not crash. The second bug
> > is fatal.
> > Second, I found the libvirtd crash because of segment fault which is
> > produced by accessing vm released. Apparently it's caused by
> > multi-thread operation, thread A access vm data which has released by
> > thread B. At last I proved my thought right.
> 
> So I've just pushed the patch upstream. Please give it a try if it
> resolves your problem.
> 
> Michal


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