netdev - Re: [PATCH 1/6] ipv6: use timer pending

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Message-ID: <4886308A.3050604@candelatech.com>
Date:	Tue, 22 Jul 2008 12:10:02 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH 1/6] ipv6: use timer pending

Stephen Hemminger wrote:
> On Mon, 21 Jul 2008 16:16:15 -0700
> Ben Greear <greearb@...delatech.com> wrote:
> 
>> Stephen Hemminger wrote:
>>> This fixes the bridge reference count problem and cleanups ipv6 FIB timer management.
>>> Don't use expires field, because it is not a proper way to test,
>>> instead use timer_pending().
>> I patched this into my 2.6.25, and it does not seem to help
>> my refcount problem.  I did not apply any of your other
>> patches as it seemed they were mostly cleanups.
>>
>> This is not to say that this patch is wrong...but
>> it seems we'll have to keep looking for other problems
>> as well.
> 
> I agree this patch is not a direct fix for the the problem. What happened
> was that I was retesting on latest 2.6 net kernel and adding tracing
> and checking.  In the process, the problem went away. Either
> a Heisenbug or some other part of the configuration changed.

Patrick sent me a debugging patch and we're poking at the problem.

Currently, it seems we are leaking in6_dev refcounts...possibly
due to a timer leak, but it's tricky code (for me, at least).  I'm
trying to add more debugging now, as I have a test case that
easily reproduces the problem.

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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