linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <548A2165.9030107@oracle.com>
Date:	Thu, 11 Dec 2014 17:57:41 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Dave Jones <davej@...hat.com>, Chris Mason <clm@...com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dâniel Fraga <fragabr@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On 12/11/2014 05:36 PM, Linus Torvalds wrote:
> On Thu, Dec 11, 2014 at 1:52 PM, Sasha Levin <sasha.levin@...cle.com> wrote:
>> >
>> > Is it possible that Dave and myself were seeing the same problem after
>> > all?
> Could be. You do have commonalities, even if the actual symptoms then
> differ. And while it looked different when you could trigger it with
> 3.16 but DaveJ couldn't, that's up in the air now that I doubt that
> 3.16 really is ok for DaveJ after all..
> 
> And you might have a better luck bisecting it, since you seem to be
> able to trigger your RCU lockup much more quickly (and apparently
> reliably? Correct?)

Right, and it reproduces in 3.10 as well, so it's not really a new thing.

What's odd is that I don't remember seeing this bug so long in the past,
I'll try bisecting trinity rather than the kernel - it's the only other
thing that changed.


Thanks,
Sasha
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