Re: frequent lockups in 3.18rc4
From: Dave Jones
Date: Mon Nov 17 2014 - 21:39:44 EST
On Mon, Nov 17, 2014 at 06:21:08PM -0800, Linus Torvalds wrote:
> On Mon, Nov 17, 2014 at 6:09 PM, Dave Jones <davej@xxxxxxxxxx> wrote:
> > After wasting countless hours rolling back to Fedora 20 and gcc 4.8.1,
> > I saw the exact same trace on 3.17, so now I don't know what to think.
> Has anything else changed? New trinity tests? If it has happened in as
> little as ten minutes, and you don't recall having seen this until
> about a week ago, it does sound like something changed.
Looking at the trinity commits over the last month or so, there's a few
new things, but nothing that sounds like it would trip up a bug like
this. "generate random ascii strings" and "mess with fcntl's after
opening fd's on startup" being the stand-outs. Everything else is pretty
much cleanups and code-motion. There was a lot of work on the code
that tracks mmaps about a month ago, but that shouldn't have had any
visible runtime differences.
<runs git diff>
hm, something I changed not that long ago, which I didn't commit yet,
was that it now runs more child processes than it used to (was 64, now 256)
I've been running like that for a while though. I want to say that was
before .17, but I'm not 100% sure.
So it could be that I'm just generating a lot more load now.
I could drop that back down and see if it 'goes away' or at least
happens less, but it strikes me that there's something here that needs
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