linux-kernel - Re: 2.6.23 hang, unstable clocksource?

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Message-ID: <19b271a20710252001r3a1b34fqf138b3b013f93aa9@mail.gmail.com>
Date:	Thu, 25 Oct 2007 23:01:38 -0400
From:	"Joshua Roys" <roysjosh@...il.com>
To:	"Chuck Ebbert" <cebbert@...hat.com>
Cc:	"john stultz" <johnstul@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.23 hang, unstable clocksource?

On 10/25/07, Chuck Ebbert <cebbert@...hat.com> wrote:
> On 10/25/2007 07:10 PM, john stultz wrote:
> >
> > What was the last kernel version you were using that didn't show the issue?
> > Couple of things to try below:
> >
> >
> > Could you disable CONFIG_HANGCHECK_TIMER  in your .config? Just to
> > make sure it isn't flipping out.
> >
> >
> > Another thing to try: Boot with "clocksource=hpet" and verify that
> > avoids or triggers the issue. If it triggers the issue does it go away
> > with "clocksource=acpi_pm"?
> >
>
> We're seeing reports of this in Fedora 8, kernel 2.6.23;
>
> https://bugzilla.redhat.com/show_bug.cgi?id=319441
>

Hello,

I tried 2.6.21 and still had the same problem, I was going to back
farther but then I decided to try a few things with my 2.6.23 config.

$ diff config-2.6.23 newconfig-2.6.23-gentoo
140,151d139
< CONFIG_CPU_FREQ=y
< CONFIG_CPU_FREQ_TABLE=y
< CONFIG_CPU_FREQ_DEBUG=y
< CONFIG_CPU_FREQ_STAT=y
< CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
< CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
< CONFIG_CPU_FREQ_GOV_USERSPACE=y
< CONFIG_CPU_FREQ_GOV_ONDEMAND=y
< CONFIG_X86_ACPI_CPUFREQ=y
< CONFIG_X86_P4_CLOCKMOD=y
< CONFIG_X86_ACPI_CPUFREQ_PROC_INTF=y
< CONFIG_X86_SPEEDSTEP_LIB=y
456a445,446
> CONFIG_SQUASHFS=m
> CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE=3
488,490d477
< CONFIG_DEBUG_KERNEL=y
< CONFIG_DETECT_SOFTLOCKUP=y
< CONFIG_SCHED_DEBUG=y
492d478
< CONFIG_FORCED_INLINING=y

config-2.6.23 is the vanilla kernel's config that was experiencing the
hangs.  2.6.23-gentoo was also experiencing the hangs.  Then, I
disabled CPU frequency scaling (and a few other things I guess,
looking at the diff..) and recompiled and..  no hangs yet.  Uptime 3
and a half days.

If you wish I can use a vanilla kernel.

Joshua Roys
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