Re: [Qemu-devel] [pve-devel] QEMU LIve Migration - swap_free: Bad swap file entry

[Marcin Gibuła]

On 06.02.2014 15:03, Stefan Priebe - Profihost AG wrote:
> some more things which happen during migration:
>
> php5.2[20258]: segfault at a0 ip 0000000000740656 sp 00007fff53b694a0
> error 4 in php-cgi[400000+6d7000]
>
> php5.2[20249]: segfault at c ip 00007f1fb8ecb2b8 sp 00007fff642d9c20
> error 4 in ZendOptimizer.so[7f1fb8e71000+147000]
>
> cron[3154]: segfault at 7f0008a70ed4 ip 00007fc890b9d440 sp
> 00007fff08a6f9b0 error 4 in libc-2.13.so[7fc890b67000+182000]

Hi,

I've seen memory corruptions after live (and offline) migrations as 
well. But in our enviroment its mostly (but not only) seen as timer 
corruption - guest hangs or have insane date in future. But I've seen 
segfaults and oopses as well.

Sadly it's very hard for me to reproduce it reliably but it occures on 
all types of linux guests - all versions of ubuntu, centos, debian, etc, 
so it doesn't seem to be connected to a specific guest kernel version. 
I've never seen windows crashing though. There was another guy here on 
qemu-devel who had similar issue and fixed it by running guest with 
no-kvmclock.

I've tested qemu 1.4 - 1.6 and kernels 3.4 - 3.10.

--
mg