linux-kernel - Re: Seeing "huh, entered softirq 8 ffffffff802682aa preempt_count 00000100, exited with 00010100?" in tip.git

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Message-ID: <20090131005445.GB21022@elte.hu>
Date:	Sat, 31 Jan 2009 01:54:45 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, Tejun Heo <tj@...nel.org>,
	paulmck@...ux.vnet.ibm.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Brian Gerst <brgerst@...il.com>
Subject: Re: Seeing "huh, entered softirq 8 ffffffff802682aa preempt_count
	00000100, exited with 00010100?" in tip.git


* H. Peter Anvin <hpa@...or.com> wrote:

> Jeremy Fitzhardinge wrote:
>>
>> I found my bug.  Turns out all my CPUs were sharing the same kernel  
>> stack (!), which means it was working surprisingly well, considering...
>>
>
> ROTFLMAO!

muhaha. I wrote such a bug only once in my whole life - back when we wrote 
the first version of the Linux SMP code, more than a decade ago. It was a 
lot of fun to debug - the exact point and nature of the crash changed as i 
added printks to the bootup code ;-)

	Ingo
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