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

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Message-ID: <4718C9A1.3010703@qumranet.com>
Date:	Fri, 19 Oct 2007 17:13:37 +0200
From:	Avi Kivity <avi@...ranet.com>
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 wrote:
> 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?
>
>   

kvm.git is actually 2.6.24-rc, pulled from -linus at a random point in
time, so it's not at all surprising if something is broken.

One option is for you to pull -linus to get the latest and hopefully
greatest and see if the bug is fixed.

Another is to use the external module capability to build kvm.git
against 2.6.23.1.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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