linux-kernel - Re: [Bug #10815] 2.6.26-rc4: RIP find_pid

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Message-ID: <20080625090400.GB11325@linux.vnet.ibm.com>
Date:	Wed, 25 Jun 2008 02:04:00 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...sign.ru>, Adrian Bunk <bunk@...nel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org
Subject: Re: [Bug #10815] 2.6.26-rc4: RIP find_pid_ns+0x6b/0xa0

On Tue, Jun 24, 2008 at 11:15:47PM +0200, Ingo Molnar wrote:
> 
> * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > > >   Also Core 2 Duo, x86_64 [1]
> > > > 
> > > >   Race is wide -- 60 seconds of rcutorture is enough.
> > 
> > This is rcutorture by itself, or in parallel with LTP/kernbench?
> > 
> > (I have mostly been running on 4-CPU boxes without failure either way, 
> > so will try a dual-CPU box.)
> 
> FYI, i've been running rcutorture for days on lots of testboxes ranging 
> all across the x86 spectrum from single CPU, through dual-core, to 
> dual-socket, dual-socket HT, 8-way and 16-way - both 32-bit and 64-bit 
> x86.
> 
> Not a single failure has been detected in thousands of bootups of random 
> kernels (rcu-preempt + rcutorture was a frequent combination tested). I 
> added a WARN_ON() to rcutorture failures so it should show up very 
> clearly.
> 
> This makes me suspect that it might be some special environment issue - 
> gcc for example. I'm using gcc 4.2.2 on most of the testboxes.

And running rcutorture overnight on an Opteron system (9.7M updates) showed
no failures.

						Thanx, Paul
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