linux-kernel - Re: 3.4+ dcache BUG.

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Date:	Mon, 21 May 2012 22:08:25 -0400
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: 3.4+ dcache BUG.

On Mon, May 21, 2012 at 06:51:51PM -0700, Linus Torvalds wrote:
 > On Mon, May 21, 2012 at 6:11 PM, Dave Jones <davej@...hat.com> wrote:
 > > Just hit this. Probably related to todays dcache changes ?
 > 
 > Almost certainly. Except:
 > 
 > > I'm not sure why, but the dcache.c line numbers don't match up..
 > > This kernel was v3.3-rc7-14528-g29db10d which looked like..
 > 
 > You seem to not have fetched any tags lately (so it says "3.3-rc7 +
 > 14528 commits" instead of something more relevant), and I can't make
 > sense of that SHA1 either (29db10d) either.
 > 
 > You probably have other changes in your tree as well, explaining the
 > SHA1 that I don't recognize?

ah, yeah. Mostly just stuff like removing noisy printk's that I get
tired of seeing when I run trinity.

 > What was the load that triggered this? Just a regular kernel compile?

kernel build doing make -j 64 on a 8 way machine. (quad core with ht)
(It has a really fast ssd, so it can really churn through builds quickly).

 > I see the "comm: cc1" there, and I'm a bit surprised, since I ran
 > those patches here locally a *lot*. Is this perhaps some low-memory
 > scenario?

hmm, that's a possibility. Machine has 4GB, but with all those gcc/ld's flying around,
maybe when it gets to a big link section..

	Dave

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