Re: [Xen-users] Database crashes when using Xen PVH

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

Hello,

Thanks for the report.

On Mon, Jun 20, 2016 at 03:10:02PM +0200, Tomas Mozes wrote:
> We observed several crashes on MariaDB databases when using Xen PVH mode.
> After switching back to Xen PV, all fine. The strange thing is that on
> application servers it works just fine (speeded up compilation times by
> 30%).
> 
> Gentoo Linux with kernel 4.1, Xen 4.6.0/4.6.1.
> 
> More details reported on Gentoo / MariaDB bug trackers:
> https://bugs.gentoo.org/show_bug.cgi?id=584828
> https://jira.mariadb.org/browse/MDEV-10167

The PVH mode you are using (pvh = 1 in the config file) is being replaced by 
a new implementation, and we are still in the transition period, therefor, 
it's not recommended for production usage, and it's very unlikely that 
anyone is going to work on bugfixing it, most of the effort is concentrated 
in getting the new implementation into a production state. I would recommend 
that you switch to PVHVM mode, that has the same performance as PVH, and is 
fully supported. If you still see the crash (SIGSEV) in PVHVM mode, please 
report back.

Thanks, Roger. 

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