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Date:	Fri, 12 Dec 2014 21:32:52 -0500
From:	Dave Jones <>
To:	Linus Torvalds <>
Cc:	Sasha Levin <>, Chris Mason <>,
	Mike Galbraith <>,
	Ingo Molnar <>,
	Peter Zijlstra <>,
	Dâniel Fraga <>,
	"Paul E. McKenney" <>,
	Linux Kernel Mailing List <>
Subject: Re: frequent lockups in 3.18rc4

On Fri, Dec 12, 2014 at 04:23:16PM -0800, Linus Torvalds wrote:
 > On Fri, Dec 12, 2014 at 3:54 PM, Sasha Levin <> wrote:
 > >
 > > I ran bisection on trinity, rather than the kernel, and got the following
 > > result:
 > Heh. That commit is pretty small, but I guess the effect of having a
 > number of regular files open and being used on the trinity loads can
 > be almost arbitrarily large.
 > Where do those files get opened? What filesystem?

in the cwd where trinity is run from. In my case, ext4

 > > I've been running trinity f2be2d5ff^ on -next for two hours now, and there's
 > > no sign of a lockup. Previously it took ~10 minutes trigger.
 > DaveJ?  Is there anything limiting the size of those files?

Nope. We could for eg, do a random truncate() with a huge size, and it would
try and create something enormous.  write()'s are limited to page size,
there might be some other syscalls I haven't added safety guards to.


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