linux-kernel - Re: Random panic in load

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Date:	Mon, 28 Jul 2014 10:11:37 -0400
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	"Theodore Ts'o" <tytso@....edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Alexei Starovoitov <ast@...nel.org>,
	=?UTF-8?Q?Michel_D=C3=A4nzer?= 
	<michel@...nzer.net>, Jakub Jelinek <jakub@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Debian GCC Maintainers <debian-gcc@...ts.debian.org>,
	Debian Kernel Team <debian-kernel@...ts.debian.org>
Subject: Re: Random panic in load_balance() with 3.16-rc

Hi -

On Mon, Jul 28, 2014 at 09:10:04AM -0400, Theodore Ts'o wrote:
> [...]
> I thought Markus told us that -fno-var-tracking-assignments makes
> absolutely no difference for non-debug kernels?

It does affect CONFIG_DEBUG_INFO kernels, and that config option is
set for all Red Hat kernels (-debug or plain).

> [...]  Is there some equivalent signalling system that gcc could use
> [...]

I'm not aware of anything trivial like a gcc --report-fixed-PRs kind
of thing.  But, kbuild could conceivably have a run-time test
involving test-running gcc with in that compare-debug mode with a
suitable test case.  We use the latter technique in systemtap for
auto-configuring to kernel versions/features; we got the $(CHECK_BUILD)
trick from vmware module makefiles.  It could be recast as a variant
of $(cc-option ...).

- FChE
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