linux-kernel - Re: 2.6.35-rc4-git3: Reported regressions from 2.6.34

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Message-Id: <201007092335.50486.rjw@sisk.pl>
Date:	Fri, 9 Jul 2010 23:35:50 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	Linux PM List <linux-pm@...ts.linux-foundation.org>,
	Linux SCSI List <linux-scsi@...r.kernel.org>,
	Linux Wireless List <linux-wireless@...r.kernel.org>,
	DRI <dri-devel@...ts.sourceforge.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	Shawn Starr <shawn.starr@...ers.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Dave Airlie <airlied@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>, Jens Axboe <axboe@...nel.dk>
Subject: Re: 2.6.35-rc4-git3: Reported regressions from 2.6.34

On Friday, July 09, 2010, Frederic Weisbecker wrote:
> On Thu, Jul 08, 2010 at 06:34:25PM -0700, Linus Torvalds wrote:
> > On Thu, Jul 8, 2010 at 4:33 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > > Bug-Entry       : http://bugzilla.kernel.org/show_bug.cgi?id=16284
> > > Subject         : Hitting WARN_ON in hw_breakpoint code
> > > Submitter       : Paul Mackerras <paulus@...ba.org>
> > > Date            : 2010-06-23 12:57 (16 days old)
> > > Message-ID      : <20100623125740.GA3368@...ck.ozlabs.ibm.com>
> > > References      : http://marc.info/?l=linux-kernel&m=127729789113432&w=2
> > 
> > This has "I have a fix, will post it very soon." in the thread from
> > Frederic, but I'm not seeing anything else. Frederic?
> 
> 
> 
> Right. In fact it wasn't a regression. The per task breakpoint reservation
> design was broken from the beginning and this warning has revealed the
> problem. This only touched perf, and it did since perf support breakpoints.
> Fortunately ptrace wasn't concerned by this problem, even not by side effects
> of this.
> 
> The fix is invasive as it's a rewrite of a (little) part of the breakpoint
> reservation. And since the symptom is only a warning and also breakpoints
> never released from the constraint table (just a counter, no memory leak),
> the fix is headed for 2.6.36.
> 
> It is ready in tip:/perf/core:
> 
> http://git.kernel.org/?p=linux/kernel/git/tip/linux-2.6-tip.git;a=commitdiff;h=45a73372efe4a63f44aa2e1125d4a777c2fdc8d8
> 
> I think this ticket can be safely closed.

OK, closing.

Rafael
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