linux-kernel - Re: Random panic in load

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Message-ID: <y0m7g2xk6ss.fsf@fche.csb>
Date:	Mon, 28 Jul 2014 08:26:59 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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


torvalds wrote:

> [...]
> Actually, I prefer my patch that did it with cc-option checking, and
> does it unconditionally.
>
> Because if we do it even for non-debug builds - where it ostensibly
> shouldn't matter - we then have that GCC_COMPARE_DEBUG thing working
> regardless of configuration.

Please note that the data produced by "-g -fvar-tracking" is consumed
by tools like systemtap, perf, crash, and makes a significant
difference to the observability of debug AND non-debug kernels.  (The
presence of compiled-in DEBUG_* self-checking code is orthogonal to
kernel observability via debuginfo.)  Please consider only disabling
var-tracking optionally/temporarily to work around this already-fixed
compiler bug, but not losing high-quality dwarf data permanently.

- FChE
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