linux-kernel - Re: 2.6.22-rc3 nmi watchdog hang

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Message-ID: <20070618143124.GA4508@atjola.homenet>
Date:	Mon, 18 Jun 2007 16:31:25 +0200
From:	Björn Steinbrink <B.Steinbrink@....de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: 2.6.22-rc3 nmi watchdog hang

On 2007.06.18 14:11:22 +0200, Ingo Molnar wrote:
> 
> * Björn Steinbrink <B.Steinbrink@....de> wrote:
> 
> > >      [PATCH] i386: Clean up NMI watchdog code
> > > 
> > > Andi - just boot with nmi_watchdog=2 on a dual-core Athlon64 CPU.
> > 
> > I still fail to reproduce this, could you send me your config?
> 
> attached below. nmi_watchdog=2 still hangs as of -rc5, using the 32-bit 
> kernel (at various places during bootup - a typical place is somewhere 
> after cfq_init()). Changing it to nmi_watchdog=0 makes the kernel boot 
> again.

Still no hang here. Just to make sure that I didn't mess the test up,
here's what I did:

Get pristine 2.6.22-rc5 kernel sources.
Put your config in place as .config
Run: make ARCH=i386 CFLAGS_KERNEL="-m32" AFLAGS_KERNEL="-m32"
Install the kernel.
Reboot, pass "nmi_watchdog=2" as kernel parameter.

As your config is for a 64bit kernel, several config items had to be set
manually. In one run, I accepted the default values, in the second run,
I tried to adjust those items to match your 64bit config as good as I
could.

Anything wrong with that?

Björn
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