Re: [Xen-users] RFH: Corruption with blktap2 on Debian 2.6.32-39 + xen-4.1.2

[Philipp Hahn <hahn@xxxxxxxxxxxxx>]

Hello,

On Tuesday 29 November 2011 15:30:11 Philipp Hahn wrote:
> I have observed several strange blktap2(?) corruption problems using
> Xen-4.1.2 on several 2.6.32-39 based amd64 Linux Systems. I run an
> installation of a domain, which use 3 blktap2 devices: 2Ã 20 GiB hard disk
> image files and 1Ã 1.1 GiB DVD iso file. During installation processes
> start to SEGV, which aborts the installation.
...
> * In one try the domU switched to read-only after file-system corruption.
> * I tested three HW systems: On 2 of them the problem always manifests, on
> a 3rd the corruption wasn't observed yet. All three have Intel i7 CPUs and
> 8 GiB RAM.

It seems to depend on some CPU feature flags:
lynx1: fpu de tsc msr pae mce cx8 apic sep mtrr mca cmov pat clflush acpi mmx 
fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good nonstop_tsc 
aperfmperf pni pclmulqdq est ssse3 cx16 sse4_1 sse4_2 x2apic popcnt aes 
hypervisor lahf_lm ida arat

xen14: fpu de tsc msr pae mce cx8 apic sep mtrr mca cmov pat clflush acpi mmx 
fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good nonstop_tsc 
aperfmperf pni           est ssse3 cx16 sse4_1 sse4_2        popcnt     
hypervisor lahf_lm ida

On 'lynx1' I can reproduce the crash, but not on 'xen14'.
With linux-3.1.x it's also fixed, but not with 2.6.32.
Any ideas to narrow this further down?

Sincerely
Philipp Hahn
-- 
Philipp Hahn           Open Source Software Engineer      hahn@xxxxxxxxxxxxx
Univention GmbH        Linux for Your Business        fon: +49 421 22 232- 0
Mary-Somerville-Str.1  D-28359 Bremen                 fax: +49 421 22 232-99
                                                   http://www.univention.de/

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