Re: Seeing "huh, entered softirq 8 ffffffff802682aa preempt_count00000100, exited with 00010100?" in tip.git

From: Ingo Molnar
Date: Fri Jan 30 2009 - 19:55:18 EST

* H. Peter Anvin <hpa@xxxxxxxxx> 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...

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 ;-)

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