linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <CA+55aFz+UQzPOwLL3doV3F6n5=7fP3YcaMiP-kF9C71Fkrw4-A@mail.gmail.com>
Date:	Sun, 16 Nov 2014 10:33:24 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: frequent lockups in 3.18rc4

On Sun, Nov 16, 2014 at 2:06 AM, Markus Trippelsdorf
<markus@...ppelsdorf.de> wrote:
>
> Before starting a bisection you could try and disable transparent_hugepages.
> There are strange bugs, that were introduced during this merge-window, in this
> area. See: https://lkml.org/lkml/2014/11/4/144
> https://lkml.org/lkml/2014/11/4/904
> http://thread.gmane.org/gmane.linux.kernel.mm/124451

Those look different, and hopefully should be fixed by commit
1d5bfe1ffb5b ("mm, compaction: prevent infinite loop in
compact_zone"). Which admittedly isn't in -rc4 (it went in on
Thursday), but I think Dave tends to run git-of-the-day rather than
last rc, so he probably already had it.

I *think* that if it was the infinite compaction problem, you'd have
the soft-lockup reports showing that. Dave's are in random places.
Which is odd.

               Linus
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