linux-kernel - Re: 3.6rc6 slab corruption.

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Message-ID: <5059D015.2020104@linux.vnet.ibm.com>
Date:	Wed, 19 Sep 2012 19:30:53 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Suzuki Poulose <suzuki@...ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: 3.6rc6 slab corruption.

On 09/19/2012 12:23 AM, Dave Jones wrote:
> On Tue, Sep 18, 2012 at 11:38:44AM -0700, Linus Torvalds wrote:
>   >  Quoting the entire email, since I added Greg to the list of people (as
>   >  the documented maintainer of debugfs) along with what I think are the
>   >  guilty parties.
>   >
>   >  Dave, is trinity perhaps doing read calls on the same file in parallel?
>
> Yeah, entirely possible. It opens hundreds of fd's on startup, and then
> a bunch of threads do whatever operations are specified on those fds.
> (in this case, just read/setsockopt, but probably the read's are all that
>   is needed to trigger this)
>

Create a 350 processes reading /sys/kernel/debug/kvm/spinlocks/histo_blocked
file simultaneously in while loop for more than 3 hours on my box.
  Could not reproduce the problem. ( was it the right thing I did to 
reproduce.. not sure..). Wanted to check that because if it had hit the
problem I can verify fix with same stuff.

But in any case will try the fix what Konrad/Linus suggested, and come back.

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