lkml.org 
[lkml]   [2006]   [Aug]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: 2.6.18-rc3-g3b445eea BUG: warning at /usr/src/linux-git/kernel/cpu.c:51/unlock_cpu_hotplug()
>> 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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-08-07 10:21    [W:0.098 / U:0.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site