linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <5485C3B5.4000401@oracle.com>
Date:	Mon, 08 Dec 2014 10:28:53 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	paulmck@...ux.vnet.ibm.com
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>, Chris Mason <clm@...com>,
	Dâniel Fraga <fragabr@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On 12/08/2014 09:33 AM, Sasha Levin wrote:
> On 12/08/2014 12:20 AM, Paul E. McKenney wrote:
>> > I have seen this caused by lost IPIs, but you have to lose two of them,
>> > which seems less than fully likely.
> It does seem that it can cause full blown stalls as well, just pretty
> rarely (notice the lack of any prints before):

Forgot to mentioned, I cranked the rcu lockup timeout to 300 seconds and got
that stall.


Thanks,
Sasha
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