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

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Message-ID: <alpine.LFD.1.10.0806231827330.2926@woody.linux-foundation.org>
Date:	Mon, 23 Jun 2008 18:31:06 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Alexey Dobriyan <adobriyan@...il.com>
cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	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, 24 Jun 2008, Alexey Dobriyan wrote:
> 
> Status update:
> * bug is reproduced on another box with the very same symptoms:
>   SMP=y, maxcpus=1 kernel occasionally fails, SMP=n is fine.
>   Also Core 2 Duo, x86_64 [1]
> 
>   Race is wide -- 60 seconds of rcutorture is enough.

Very odd how you can reproduce it - now on two machines - but it doesn't 
seem to happen for others. You've tried different compilers, you've tried 
different config options, what the heck is left?

And it's not like Core 2 Duo is an "odd" setup. Even any timer differences 
should have been largely flushed out with HIGH_RES_TIMERS=y/n.

Is there *anything* odd about those machines?

		Linus
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