linux-kernel - Re: v2.6.31-rc6: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008

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Message-ID: <m1ocqbgcsi.fsf@fess.ebiederm.org>
Date:	Thu, 20 Aug 2009 00:33:17 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Xiaotian Feng <xtfeng@...il.com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: v2.6.31-rc6: BUG: unable to handle kernel NULL pointer  dereference at 0000000000000008

Xiaotian Feng <xtfeng@...il.com> writes:

> On Thu, Aug 20, 2009 at 2:07 PM, Eric W. Biederman <ebiederm@...ssion.com>
> wrote:
>
>
>     ebiederm@...ssion.com (Eric W. Biederman) writes:
>
>     > I'm not certain who I should route this too, but I just had 2.6.31-rc6
>     > fall over on me.  I don't know how reproducible this will be but
>     > I have a full crash dump if someone is interested in looking into this.
>
>     Looks like I was wrong.  This is appears trivial to reproduce,
>     I have just reproduced it two more times in a row.  I think
>     the problem is pty related.
>
>     I was looking into a change in behavior on 2.6.31-rc6 where
>     data was being lost, and it appears one variant of my test program
>     kills the kernel.
>
>     The following program run as an unprivileged user causes a kernel
>     panic in about a minute:
>
>     aka
>
>     while :; do ./KernelTtyTest ; done
>
>
> oops.... It panics my x86_64 machine.....

I guess I forgot to mention that detail.  Thanks for confirming this
bug isn't just me.

Eric
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