From: Ingo Molnar <mingo@elte.hu>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Andi Kleen <ak@suse.de>, Eric Rannaud <eric.rannaud@gmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
nagar@watson.ibm.com, Chandra Seetharaman <sekharan@us.ibm.com>,
Jan Beulich <jbeulich@novell.com>
Subject: Re: BUG-lockdep and freeze (was: Arrr! Linux 2.6.18)
Date: Sat, 30 Sep 2006 23:25:24 +0200 [thread overview]
Message-ID: <20060930212524.GA6332@elte.hu> (raw)
In-Reply-To: <Pine.LNX.4.64.0609301406340.3952@g5.osdl.org>
* Linus Torvalds <torvalds@osdl.org> wrote:
> It could - and _should_ dammit! - do some basic sanity tests like "is
> the thing even in the same stack page"? But nooo... It seems
> _designed_ to be fragile and broken.
>
> Here's a simple test: if the next stack-slot isn't on the same page,
> the unwind information is bogus unless you had the IRQ stack-switch
> signature there. Does the code do that? No. It just assumes that
> unwind information is complete and perfect.
fully agreed - i have pointed out areas of conceptual fragility to Jan
early on:
http://lkml.org/lkml/2006/6/2/59
(but AFAICS i got no reply to that mail - i missed that in the lockdep
flurry.)
Ingo
next prev parent reply other threads:[~2006-09-30 21:33 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-30 19:20 BUG-lockdep and freeze (was: Arrr! Linux 2.6.18) Eric Rannaud
2006-09-30 19:49 ` Peter Zijlstra
2006-09-30 20:23 ` Linus Torvalds
2006-09-30 20:57 ` Eric Rannaud
2006-09-30 19:54 ` Linus Torvalds
2006-09-30 20:21 ` Al Viro
2006-09-30 20:28 ` Linus Torvalds
2006-09-30 20:30 ` Andi Kleen
2006-09-30 20:47 ` Linus Torvalds
2006-09-30 20:49 ` Ingo Molnar
2006-09-30 21:11 ` Linus Torvalds
2006-09-30 21:25 ` Ingo Molnar [this message]
2006-09-30 21:57 ` Andi Kleen
2006-09-30 22:09 ` BUG-lockdep and freeze (was: Arrr! Linux 2.6.18) II Andi Kleen
2006-09-30 22:19 ` Eric Rannaud
2006-09-30 22:24 ` Andi Kleen
2006-09-30 22:54 ` BUG-lockdep and freeze (was: Arrr! Linux 2.6.18) Linus Torvalds
2006-10-04 9:21 ` Jan Beulich
2006-10-04 15:12 ` Linus Torvalds
2006-09-30 21:43 ` Eric Rannaud
2006-09-30 22:03 ` Andi Kleen
2006-09-30 21:56 ` Linus Torvalds
2006-09-30 22:02 ` Andi Kleen
2006-09-30 22:10 ` Ingo Molnar
2006-09-30 22:23 ` Andi Kleen
2006-09-30 22:55 ` Linus Torvalds
2006-09-30 22:59 ` Linus Torvalds
2006-09-30 23:56 ` Andi Kleen
2006-10-01 0:25 ` Linus Torvalds
2006-10-01 0:51 ` Linus Torvalds
2006-10-01 9:27 ` Andi Kleen
2006-10-04 9:25 ` Jan Beulich
2006-10-04 10:52 ` Andi Kleen
2006-10-04 11:58 ` Jan Beulich
2006-10-04 12:03 ` Andi Kleen
2006-10-04 12:10 ` Jan Beulich
2006-09-30 20:43 ` Linus Torvalds
2006-10-04 9:15 ` Jan Beulich
2006-09-30 20:13 ` Andrew Morton
2006-09-30 20:52 ` Eric Rannaud
2006-09-30 21:04 ` Andrew Morton
2006-09-30 22:00 ` Eric Rannaud
2006-09-30 22:05 ` Ingo Molnar
2006-10-01 0:59 ` Eric Rannaud
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