linux-kernel - Re: Random panic in load

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Message-ID: <20140726195503.GJ6725@thunk.org>
Date:	Sat, 26 Jul 2014 15:55:03 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Michel Dänzer <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

On Sat, Jul 26, 2014 at 09:35:57PM +0200, Markus Trippelsdorf wrote:
> 
> But fortunately the workaround for the new inode.c bug is the same as
> for the original bug: -fno-var-tracking-assignments. 
> 
> It would make sense to enabled it unconditionally for all debug
> configurations for now.

What's the downside of enabling this unconditionally on a compiler
with the bug fixed?  I assume a certain amount of optimization will
lost, but is it significant/measurable?

					- Ted
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