linux-kernel - Re: [kvm-devel] severe bug in 2.6.23+ kvm.git

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Message-ID: <47189585.5010901@aurel32.net>
Date:	Fri, 19 Oct 2007 13:31:17 +0200
From:	Aurelien Jarno <aurelien@...el32.net>
To:	carsteno@...ibm.com
CC:	"kvm-devel@...ts.sourceforge.net" <kvm-devel@...ts.sourceforge.net>,
	Linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] severe bug in 2.6.23+ kvm.git

Carsten Otte a écrit :
> Hi list,
> 
> we've experienced a severe bug in current kvm.git, that may have been 
> introduced to the git tree quite recently around last weekend. 2.6.23 
> is broken, 2.6.23-rc8 works for us. The symptom is, that our operon 
> kvm test machine shredders its hard disk content to a state that is 
> not correctably by the file system checker. We use raid1 md mirrored 
> ext3 file systems on 4 sata hard disks on it, and we've verified 
> correct operation of the hardware via badblocks and memtest86.
> The problem occurs even without kvm modules loaded, so the cause seems 
> to be something that Avi pulled elsewhere. Did anyone else experience 
> similar problems with the 2.6.23 based kvm tree? Does anyone have an 
> idea about a possible cause, which would help us debugging it?
> 

Could you please precise what is corrupted? The guest disk image?

If that's the case, I experienced the same problem since
kvm-userspace.git has been updated to the latest qemu CVS, and I can
reproduce it with plain QEMU. I am able to reproduce it easily by
booting FreeBSD.

The problem is actually in QEMU, it has been broken by this commit:
http://cvs.savannah.nongnu.org/viewvc/qemu/hw/ide.c?root=qemu&r1=1.64&r2=1.65

You can try to apply the attached patch, it reverts this commit and can
be applied to the latest QEMU CVS and to the latest KVM versions.

-- 
  .''`.  Aurelien Jarno	            | GPG: 1024D/F1BCDB73
 : :' :  Debian developer           | Electrical Engineer
 `. `'   aurel32@...ian.org         | aurelien@...el32.net
   `-    people.debian.org/~aurel32 | www.aurel32.net

View attachment "qemu-ide-corruption.diff" of type "text/x-patch" (2587 bytes)