linux-kernel - Re: 2.6.26-rc2-mm1

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Message-Id: <20080514140032.83fc25b7.akpm@linux-foundation.org>
Date:	Wed, 14 May 2008 14:00:32 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Zan Lynx <zlynx@....org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.26-rc2-mm1

On Wed, 14 May 2008 14:49:07 -0600
Zan Lynx <zlynx@....org> wrote:

> On Wed, 2008-05-14 at 01:01 -0700, Andrew Morton wrote: 
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.26-rc2/2.6.26-rc2-mm1/
> > 
> > 
> > - The -mm tree is now based on linux-next.
> > 
> >   I will occasionally pick up later versions of trees which are already
> >   in linux-next, to catch material which was added after Stephen last
> >   pulled that tree.  That happened this time: git-net had a lot of driver
> >   changes which weren't in linux-next and which I wanted in
> >   2.6.26-rc2-mm1.
> > 
> > - A few more git trees were added: git-ubifs.patch, git-regulator.patch,
> >   git-logfs.patch, git-orion.patch.
> 
> No good on my first attempt.  Here is what I ran into:
> 
> The printk timestamps have gone wild.  I cannot paste a dmesg but here
> is one line I wrote down:
> [17180644.495790] Testing tracer ftrace: NMI watchdog ...

I've seen reports like this against mainline, but I'm not sure that
much has been done about it yet.

> Which leads into the next problem: The kernel freezes after Testing
> tracer ftrace.  Then I rebooted with my special testing command line
> "kernel /bzImage-2.6.26-rc2-mm1 root=/dev/sda2 rootfstype=reiser4
> rootflags=defaults,noatime i8042.nomux elevator=cfq resume=/dev/sda3
> panic=5 nmi_watchdog=2,panic debug idle=poll nohz=off"
> 
> and I got the same freeze but then the NMI watchdog message.  Which is
> the third problem.
> 
> Why did the NMI watchdog not panic and reboot the system?  It detected
> the lock and printed the message.  It should have then panicked, waited
> 5 seconds, and rebooted.
> 
> System is a 64-bit Gentoo AMD-64 Compaq R3000 laptop.  Compiler is GCC
> 4.3.

afaict this is all Ingo/Thomas stuff, so I'll add the ccs and run away :(

> Config follows:

Thanks.
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