From: Linus Torvalds <torvalds@linux-foundation.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Antonio SJ Musumeci <trapexit@spawn.link>,
Miklos Szeredi <miklos@szeredi.hu>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
stable <stable@vger.kernel.org>
Subject: Re: BUG_ON() in workingset_node_shadows_dec() triggers
Date: Mon, 3 Oct 2016 21:12:48 -0700 [thread overview]
Message-ID: <CA+55aFy6a8BVWtqgeJKZuhU-CZFVZ3X90SdQ5z+NTDDsEOnpJA@mail.gmail.com> (raw)
In-Reply-To: <20161003210729.e4c39a86b8e8e4d103715c7d@linux-foundation.org>
On Mon, Oct 3, 2016 at 9:07 PM, Andrew Morton <akpm@linux-foundation.org> wrote:
>
> Well, it's a VM_BUG_ON and few people run with CONFIG_DEBUG_VM.
Ehh. If by "few people" you mean "pretty much everybody", you'd be
right, but your choice of wording would be somewhat misleading,
wouldn't you say?
Hint: here's a line from the standard Fedora kernel config:
CONFIG_DEBUG_VM=y
so *no*. VM_BUG_ON() is no less deadly than a regular BUG_ON(). It
just allows some people to build smaller kernels, but apparently
distro people would rather have debugging than save a few kB of RAM.
The VM debvugging code has VM_WARN_ON() and VM_WARN_ON_ONCE() for
people who want to get a "oops, my assumptions were wrong"
Killing machines because somebody made an assumption that was wrong is not ok.
Killing the machine is ok if we have a situation where there literally
is no other choice.
Linus
next prev parent reply other threads:[~2016-10-04 4:12 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-04 4:00 BUG_ON() in workingset_node_shadows_dec() triggers Linus Torvalds
2016-10-04 4:07 ` Andrew Morton
2016-10-04 4:12 ` Linus Torvalds [this message]
2016-10-04 7:03 ` Raymond Jennings
2016-10-04 16:03 ` Linus Torvalds
2016-10-04 8:02 ` Greg KH
2016-10-04 9:32 ` Johannes Weiner
2016-10-05 1:21 ` Linus Torvalds
2016-10-05 9:25 ` Johannes Weiner
2016-10-05 9:31 ` Johannes Weiner
2016-10-05 10:40 ` Jan Kara
2016-10-05 16:10 ` Linus Torvalds
2016-10-05 17:00 ` [PATCH] checkpatch: extend BUG warning Joe Perches
2016-10-05 17:07 ` Linus Torvalds
2016-10-05 2:43 ` BUG_ON() in workingset_node_shadows_dec() triggers Paul Gortmaker
2016-10-05 3:29 ` Linus Torvalds
2016-10-05 5:44 ` Willy Tarreau
2016-10-05 15:52 ` Linus Torvalds
2016-10-05 19:06 ` Willy Tarreau
2016-10-05 19:18 ` Linus Torvalds
2016-10-05 21:09 ` Willy Tarreau
2016-10-05 21:14 ` Kees Cook
2016-10-05 21:46 ` Linus Torvalds
2016-10-05 22:17 ` Kees Cook
2016-10-05 22:29 ` Linus Torvalds
2016-10-06 22:07 ` Kees Cook
2016-10-06 22:29 ` Linus Torvalds
2016-10-06 23:05 ` Kees Cook
2016-10-06 23:59 ` Linus Torvalds
2016-10-07 5:48 ` Willy Tarreau
2016-10-07 17:16 ` Kees Cook
2016-10-07 17:21 ` Linus Torvalds
2016-10-07 17:33 ` Kees Cook
2016-10-07 18:26 ` Willy Tarreau
2016-10-06 1:59 ` Dave Chinner
2016-10-06 2:12 ` Linus Torvalds
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