linux-kernel - Re: [PATCH 2.6.19] ehca: bug fix: use wqe offset instead wqe address to determine pending work requests

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Message-ID: <adaslgbaxsu.fsf@cisco.com>
Date:	Wed, 22 Nov 2006 15:04:01 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	Hoang-Nam Nguyen <hnguyen@...ux.vnet.ibm.com>
Cc:	rolandd@...co.com, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, openib-general@...nib.org,
	raisch@...ibm.com
Subject: Re: [PATCH 2.6.19] ehca: bug fix: use wqe offset instead wqe address to determine pending work requests

 > We found this bug actually through a code review by random. Since
 > (un)fortunately the queue pages were layouted in order, we've not
 > seen it earlier. It's certainly a bug and can cause kernel panic 
 > if above observation is not met, probably in stress situation
 > of system. That means the "former" code accesses next page that 
 > it has not allocated.

OK.  After thinking about this, I'm going to queue it for 2.6.20 --
we're _way_ too close to the 2.6.19 final release to put in patches
that aren't either small and obvious, or fix a problem someone hit in
real life.

 - R.
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