From: Marcelo Tosatti <mtosatti@redhat.com>
To: Mark McLoughlin <markmc@redhat.com>
Cc: kvm <kvm@vger.kernel.org>
Subject: Re: 2.6.29-rc3 oops with kvmclock
Date: Sun, 8 Feb 2009 04:02:13 -0200 [thread overview]
Message-ID: <20090208060213.GB4437@amt.cnet> (raw)
In-Reply-To: <1233656727.3726.23.camel@blaa>
Hi Mark,
On Tue, Feb 03, 2009 at 10:25:27AM +0000, Mark McLoughlin wrote:
> Hi,
>
> Same guest, this time a kvmclock related oops.
>
> Cheers,
> Mark.
>
> kernel BUG at include/linux/mm.h:302!
static inline void get_page(struct page *page)
{
page = compound_head(page);
VM_BUG_ON(atomic_read(&page->_count) == 0);
atomic_inc(&page->_count);
}
> RIP [<ffffffff810bb332>] do_wp_page+0x324/0x6d8
>From do_wp_page (COW pagefault handler). So the page was freed (or
thats how do_wp_page perceives it) while expected not to be (probably
because the page is pinned by the read-only pte reference, by the time
do_wp_page starts).
> invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC
The FC11 kernel has pvmmu on. It _could_ be a weird side effect of the
pvmmu slab bug (which only happens with DEBUG_PAGEALLOC). What were you
doing when this happened? Reproducible?
Or some other corruption that causes the crazy symptom.
next prev parent reply other threads:[~2009-02-08 6:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-03 10:25 2.6.29-rc3 oops with kvmclock Mark McLoughlin
2009-02-03 10:30 ` Glauber Costa
2009-02-03 11:50 ` Mark McLoughlin
2009-02-08 6:02 ` Marcelo Tosatti [this message]
2009-02-09 14:15 ` Mark McLoughlin
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