linux-kernel - Re: [PATCH] remove BUG() in possible but rare condition

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Message-ID: <CA+55aFx1GMWGgh0sTAzvvVSzPQsQ_4NKeaNv1zpKrP4fg1dG+Q@mail.gmail.com>
Date:	Wed, 11 Apr 2012 11:57:56 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Glauber Costa <glommer@...allels.com>,
	linux-kernel@...r.kernel.org, devel@...nvz.org, linux-mm@...ck.org,
	cgroups@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
	kamezawa.hiroyu@...fujitsu.com, Greg Thelen <gthelen@...gle.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] remove BUG() in possible but rare condition

On Wed, Apr 11, 2012 at 11:48 AM, Michal Hocko <mhocko@...e.cz> wrote:
>
> I am not familiar with the code much but a trivial call chain walk up to
> write_dev_supers (in btrfs) shows that we do not check for the return value
> from __getblk so we would nullptr and there might be more.
> I guess these need some treat before the BUG might be removed, right?

Well, realistically, isn't BUG() as bad as a NULL pointer dereference?

Do you care about the exact message on the screen when your machine dies?

                     Linus
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