linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <5485D316.9080001@oracle.com>
Date:	Mon, 08 Dec 2014 11:34:30 -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 10:57 AM, Paul E. McKenney wrote:
> On Mon, Dec 08, 2014 at 10:28:53AM -0500, Sasha Levin wrote:
>> > 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.
> So with the default of 21 seconds, you presumably get huge numbers of
> RCU CPU stall warnings?

Yes, I'm seeing 1 lockup every ~5 minutes on my set up.

The traces do seem to be different every time.


Thanks,
Sasha
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