Re: frequent lockups in 3.18rc4
From: Sasha Levin
Date: Mon Dec 08 2014 - 11:34:50 EST
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.
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