From: "Jan Beulich" <jbeulich@novell.com>
To: "Andi Kleen" <ak@muc.de>, "Andrew Morton" <akpm@osdl.org>
Cc: "Michal Piotrowski" <michal.k.k.piotrowski@gmail.com>,
<torvalds@osdl.org>, <davej@redhat.com>,
<linux-kernel@vger.kernel.org>
Subject: Re: 2.6.18-rc3-g3b445eea BUG: warning at /usr/src/linux-git/kernel/cpu.c:51/unlock_cpu_hotplug()
Date: Mon, 07 Aug 2006 09:18:22 +0100 [thread overview]
Message-ID: <44D7136E.76E4.0078.0@novell.com> (raw)
In-Reply-To: <20060807012638.GA42404@muc.de>
>> It's a false-positive in this case - the backtrace was complete. It would
>> be good if we could make the did-we-get-stuck detector a bit smarter. Even
>> special-casing "sysenter_past_esp" would stop a lot of this..
>
>Actually it's not completely false in this case -- it should
>have reached user mode and stopped there, but for some reason
>I didn't and already stopped still in the kernel.
>
>Most likely the CFI annotation for that sysenter path is not complete.
Correct, the return point of sysexit (SYSENTER_RETURN) is still in kernel space,
but its annotations are invisible to the unwinder. We should make the VDSO be
treated as user-mode code despite living above PAGE_OFFSET.
>It's on my todo list to investigate but I still hope Jan does it first ;-)
I'll try to, once I've got through moving the Xen code from 2.6.16 to 2.6.18-rc3
Jan
next prev parent reply other threads:[~2006-08-07 8:17 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-04 19:04 Michal Piotrowski
2006-08-04 19:24 ` Linus Torvalds
2006-08-04 22:24 ` Dave Jones
2006-08-05 0:31 ` Dave Jones
2006-08-05 2:10 ` Dave Jones
2006-08-05 2:23 ` Dave Jones
2006-08-05 2:49 ` Dave Jones
2006-08-05 6:47 ` Dave Jones
2006-08-05 7:46 ` Andrew Morton
2006-08-05 19:47 ` Dave Jones
2006-08-05 20:02 ` Andrew Morton
2006-08-06 1:12 ` Andrew Morton
2006-08-05 10:54 ` Michal Piotrowski
2006-08-05 11:11 ` Michal Piotrowski
2006-08-05 11:26 ` Michal Piotrowski
2006-08-05 18:47 ` Dave Jones
2006-08-05 21:15 ` Michal Piotrowski
2006-08-06 16:59 ` Michal Piotrowski
2006-08-06 18:05 ` Dave Jones
2006-08-06 19:32 ` Andrew Morton
2006-08-07 1:26 ` Andi Kleen
2006-08-07 8:18 ` Jan Beulich [this message]
2006-08-15 12:23 ` Jan Beulich
2006-08-05 22:14 art
2006-08-06 1:23 ` Dave Jones
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