From: Jack Steiner <steiner@sgi.com>
To: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>,
"mingo@elte.hu" <mingo@elte.hu>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Panic in reserve_memtype()
Date: Wed, 24 Feb 2010 15:37:29 -0600 [thread overview]
Message-ID: <20100224213729.GA15936@sgi.com> (raw)
In-Reply-To: <1267045764.16916.920.camel@localhost.localdomain>
On Wed, Feb 24, 2010 at 01:09:24PM -0800, Pallipadi, Venkatesh wrote:
>
> On Wed, 2010-02-24 at 12:22 -0800, Jack Steiner wrote:
> > We see an X86_64 regression that started a few days ago. The kernel is booted
> > via EFI & panics in the pat.c code trying to deref a NULL pointer.
> >
> > I didn't debug the problem but am suspicious of
> > x86, pat: Migrate to rbtree only backend for pat memtype management x86/pat
> > author Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com>
> > Wed, 10 Feb 2010 23:26:07 +0000 (15:26 -0800)
> > committer H. Peter Anvin <hpa@zytor.com>
> > Thu, 18 Feb 2010 23:41:36 +0000 (15:41 -0800)
> >
> >
> >
> > Has anyone seen this? If not, I can debug further....
> >
>
>
> Haven't seen this on my test systems here, but I haven't tested with EFI
> boot either.
>
> I assume this is repeatable, and you always see this panic. I am looking
> at the code right now. Can you rollback this particular patch and see
> whether it goes away?
The problem is very repeatible.
FWIW, we have a nightly regression test that builds/tests the x86 tree
everynight at 1 AM. The failure started on the morning of Feb 22.
The build on Feb 21 (& all of Feb before then) passed w/o errors.
I can't rule out other errors but I don't see anything else that changed.
The linux-next tree appears to have the same problem.
--- jack
next prev parent reply other threads:[~2010-02-24 21:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-24 20:22 Panic in reserve_memtype() Jack Steiner
2010-02-24 21:09 ` Pallipadi, Venkatesh
2010-02-24 21:37 ` Jack Steiner [this message]
2010-02-24 21:43 ` Pallipadi, Venkatesh
2010-02-24 22:05 ` Jack Steiner
2010-03-01 15:11 ` Jack Steiner
2010-03-01 17:55 ` Pallipadi, Venkatesh
2010-03-01 23:21 ` [tip:x86/pat] x86, pat: In rbt_memtype_check_insert(), update new->type only if valid tip-bot for Pallipadi, Venkatesh
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