linux-kernel - Re: [patch 0/9] x86, xsave: xsave/xrstor support

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Date:	Fri, 1 Aug 2008 00:17:44 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"roland@...hat.com" <roland@...hat.com>,
	"drepper@...hat.com" <drepper@...hat.com>,
	"mikpe@...uu.se" <mikpe@...uu.se>,
	"chrisw@...s-sol.org" <chrisw@...s-sol.org>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/9] x86, xsave: xsave/xrstor support


* Suresh Siddha <suresh.b.siddha@...el.com> wrote:

> On Thu, Jul 31, 2008 at 02:29:15PM -0700, Ingo Molnar wrote:
> > > Ingo, 2.6.25, 2.6.26 also reboots randomly with this config on my
> > > dual-socket system.
> > 
> > hmmm ....
> > 
> > a few guesses: perhaps I2C related (the randconfig turned on I2C bits)?
> > Do you have any way (hw test-kit) to figure out where the reboot comes
> > from - is it a triple fault caused by the kernel? Or some hardware
> > event?
> 
> Doh! I knew something was wrong with your randconfig :)
> 
> #
> # Watchdog Device Drivers
> #
> ....
> 
> CONFIG_PC87413_WDT=y
> CONFIG_60XX_WDT=y
> # CONFIG_SBC8360_WDT is not set
> CONFIG_CPU5_WDT=y
> CONFIG_SMSC37B787_WDT=y
> CONFIG_W83627HF_WDT=y
> CONFIG_W83697HF_WDT=y
> CONFIG_W83877F_WDT=y
> CONFIG_W83977F_WDT=y
> CONFIG_MACHZ_WDT=y
> CONFIG_SBC_EPX_C3_WATCHDOG=y
> 
> Kernel was enabling watchdog, with out the userspace having the 
> heartbeat daemon....

I never had function hw watchdog support on this box - so i guess the 
2.6.27-rc1 kernel started supporting it - cool.

This was unfortunate timing i guess - when i removed xsave i didnt get 
the reboot :-/

> randconfig is really not a good way to test! I can't even ssh to the 
> box with this config (something else is missing in the config!)

it is a randconfig tailored to my testboxes, it might not work out of 
box on yours :-)

randconfig is an excellent way of testing kernels, that testbox can run 
strings of hundreds (sometimes thousands) of random kernels without 
hitting any kernel bug. I had to resolve a large number of real kernel 
bugs (and a handful of glitches like this hardware watchdog thing) to 
get so far though.

> Anyhow, with watchdog removed, it works just fine. (both xsave and 
> non-xsave kernels)

Great, thanks. I've re-integrated tip/x86/xsave into x86/master and have 
pushed out the result.

	Ingo
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