linux-kernel - Re: [BUG] 2.6.21: Kernel won't boot with either/both of CONFIG_NO_HZ, CONFIG_HIGH_RES

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Message-ID: <46374B1D.6050509@rtr.ca>
Date:	Tue, 01 May 2007 10:13:49 -0400
From:	Mark Lord <lkml@....ca>
To:	tglx@...utronix.de
Cc:	Daniel Walker <dwalker@...sta.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: [BUG] 2.6.21: Kernel won't boot with either/both of CONFIG_NO_HZ,
 CONFIG_HIGH_RES_TIMERS

Thomas Gleixner wrote:
> On Tue, 2007-05-01 at 09:34 -0400, Mark Lord wrote:
>>> now at 3232363876949 nsecs
>> ...
>>
>> Oh, in case it matters any:
>> that /proc/timer_list is from the system with CFS-V7 also patched in.
> 
> It should not. What happens when you disable HPET ?

Booting with clocksource=tsc still hangs in what appears
to be the exact same place.

Screenshots for that are available here:   http://rtr.ca/hrtimers/

Of possible interest is that the bottom of the 25line screen capture
differs somewhat from the 50line capture.. see for yourself.
This is 100% consistent from boot to boot.

Using CONFIG_DETECT_SOFTLOCKUP=y eliminates the problem,
so that's really got to be a huge clue, somehow ?

Meanwhile, I'm going to try a libata patch I just saw posted by Tejun.
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