linux-kernel - Re: [kvm-devel] guest crash on 2.6.20-rc4

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Message-ID: <45A35800.9090602@qumranet.com>
Date:	Tue, 09 Jan 2007 10:53:20 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Roland Dreier <rdreier@...co.com>
CC:	kvm-devel <kvm-devel@...ts.sourceforge.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] guest crash on 2.6.20-rc4

Roland Dreier wrote:
> I'm running a 64-bit Fedora 6 install as a guest on a host running
> 2.6.20-rc4 with the kvm-10 userspace release.  The CPU is a Xeon 5160
> and I have 6 GB of RAM.  The guest is given 512 MB of memory.  I left
> the guest idle overnight, and the makewhatis cron job seems to have
> triggered this:
>
>     Unable to handle kernel paging request at ffff81000ba04000 RIP:
>      [<ffffffff8025f402>] clear_page+0x16/0x44
>     PGD 8063 PUD 9063 PMD 800000000ba001e3 PTE aad8a7d881d984d9
>   

The pgd/pud/pmd entries are all correct, so it's clear the mmu is confused.

> I just let yum update the guest to the 2.6.18-1.2869.fc6 kernel, but
> I'm more suspicious of the MMU changes to kvm...
>
>   

Yes.

> I don't see anything come up in the host logs when this happens.
>
> Let me know if there is other debugging info that would be helpful.
>   

A way to reproduce this would be nice, though I realize it's asking much.

-- 
error compiling committee.c: too many arguments to function

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