Re: [RFC][PATCH] rcu classic: new algorithm for callbacks-processing

From: Lai Jiangshan
Date: Sun Jul 06 2008 - 05:26:27 EST


Paul E. McKenney wrote:

>
> You tried this without your changes and it passed, correct?
>
> Never forget to test the base kernel. ;-)
>

Thanks, but I make some mistake here.

I tested the base kernel, no bug occurred.
So I try to find out bugs in my changes in 2 weeks.

I added debug codes and these codes showed all processing
are right and no callback broke its grace period
but the bug still occurred.

When I was puzzled after 2 weeks, I looked back the base
kernel that I had tested, and I found that I forget to set
CONFIG_NO_HZ=y.

Then I set CONFIG_NO_HZ=y in the base kernel, and the bug
occurred. It's exactly as the bug when my patch applied.

I have reported this bug here:
http://lkml.org/lkml/2008/7/3/24







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