2.6.22-rc7: known regressions with patches v2

2.6.22-rc7: known regressions with patches v2

[Michal Piotrowski]

Hi all,

Here is a list of some known regressions in 2.6.22-rc7
with patches available.

Feel free to add new regressions/remove fixed etc.
http://kernelnewbies.org/known_regressions

List of Aces

Name                    Regressions fixed since 21-Jun-2007
Hugh Dickins                           2
Andi Kleen                             2
Andrew Morton                          1
Benjamin Herrenschmidt                 1
Björn Steinbrink                       1
Bjorn Helgaas                          1
Christoph Lameter                      1
David Woodhouse                        1
Jean Delvare                           1
Olaf Hering                            1
Siddha, Suresh B                       1
Trent Piepho                           1
Ville Syrjälä                          1



Unclassified

Subject         : [2.6.22 regression fix] DLM must depend on SYSFS
References      : http://lkml.org/lkml/2007/7/7/4
Last known good : ?
Submitter       : Adrian Bunk <bunk@stusta.de>
Caused-By       : ?
Handled-By      : Adrian Bunk <bunk@stusta.de>
Status          : patch available

Subject         : [2.6.22 regression fix] include/linux/kallsyms.h must #include <linux/errno.h>
References      : http://lkml.org/lkml/2007/7/6/359
Last known good : ?
Submitter       : Adrian Bunk <bunk@stusta.de>
Caused-By       : ?
Handled-By      : Adrian Bunk <bunk@stusta.de>
Status          : patch available



Bluetooth

Subject         : problem with a bluetooth mouse
References      : http://lkml.org/lkml/2007/7/4/321
Last known good : ?
Submitter       : David Woodhouse <dwmw2@infradead.org>
Caused-By       : ?
Handled-By      : Jiri Kosina <jkosina@suse.cz>
                  Dmitry Torokhov <dtor@insightbb.com>
Patch           : http://lkml.org/lkml/2007/7/6/391
Status          : patch available



Regards,
Michal

--
LOG
http://www.stardust.webpages.pl/log/

Re: 2.6.22-rc7: known regressions with patches v2

[David Woodhouse]

On Sat, 2007-07-07 at 18:06 +0200, Michal Piotrowski wrote:
> FBDEV
> 
> Subject         : SLUB kmalloc-32768: Poison check failed@0xc1e20000
> slab 0xc04de400
> References      : http://lkml.org/lkml/2007/7/4/305
> Last known good : ?
> Submitter       : David Woodhouse <dwmw2@infradead.org>
> Caused-By       : ?
> Handled-By      : ?
> Status          : unknown

If you're looking for someone to blame, consider the fact that this has
gone away now I've switched back to slab. :)

> Bluetooth
> 
> Subject         : problem with a bluetooth mouse
> References      : http://lkml.org/lkml/2007/7/4/321
> Last known good : ?
> Submitter       : David Woodhouse <dwmw2@infradead.org>
> Caused-By       : ?
> Handled-By      : Jiri Kosina <jkosina@suse.cz>
>                   Dmitry Torokhov <dtor@insightbb.com>
> Patch           : http://lkml.org/lkml/2007/7/6/391
> Status          : patch available

That patch was a straw man for Marcel to comment on, not necessarily a
real fix. I don't know the code that well, and naïvely reordering bits
of it could have introduced another race which I just haven't triggered
yet.

Strictly speaking, it wasn't a 2.6.22 regression either -- I actually
saw it for the first time in 2.6.21-rc iirc.

Thanks for tracking these, btw. It's very useful.

-- 
dwmw2

Re: 2.6.22-rc7: known regressions with patches v2

[Michal Piotrowski]

On 07/07/07, David Woodhouse <dwmw2@infradead.org> wrote:
> On Sat, 2007-07-07 at 18:06 +0200, Michal Piotrowski wrote:
> > FBDEV
> >
> > Subject         : SLUB kmalloc-32768: Poison check failed@0xc1e20000
> > slab 0xc04de400
> > References      : http://lkml.org/lkml/2007/7/4/305
> > Last known good : ?
> > Submitter       : David Woodhouse <dwmw2@infradead.org>
> > Caused-By       : ?
> > Handled-By      : ?
> > Status          : unknown
>
> If you're looking for someone to blame, consider the fact that this has
> gone away now I've switched back to slab. :)
>

Yup, I forgot to add Christoph to CC  :)

Regards,
Michal

-- 
LOG
http://www.stardust.webpages.pl/log/

Re: 2.6.22-rc7: known regressions with patches v2

[Christoph Lameter]

On Sat, 7 Jul 2007, Michal Piotrowski wrote:

> > If you're looking for someone to blame, consider the fact that this has
> > gone away now I've switched back to slab. :)
> Yup, I forgot to add Christoph to CC  :)

Hmmmm.. Cannot see the corruption in the dump since it only includes 128 
bytes and it seems to have occurred way into the object. If you want to 
dump 32k to your syslog to see the corruption then look at the 
print_trailer() function and change the parameter of the call to 
print_section

	print_section("Object", p, min(s->objsize, 128));


This is a 32k sized slab and SLAB does not allow debugging on power of two 
slabs > pagesize.... No surprise that SLAB does not complain.

What are these functions "malloc" and "free"? Would be good if those 
would be using kmalloc_track_caller() so that we can figure out who called 
them.

Re: 2.6.22-rc7: known regressions with patches v2

[Linus Torvalds]

On Sat, 7 Jul 2007, Christoph Lameter wrote:
> 
> What are these functions "malloc" and "free"? Would be good if those 
> would be using kmalloc_track_caller() so that we can figure out who called 
> them.

There's not a lot of those around. Looks like it's probably one of

	init/do_mounts_rd.c:static void __init *malloc(size_t size)
	init/initramfs.c:static void __init *malloc(size_t size)

both of which exist just because those things include "lib/inflate.c".

It's probably do_mounts_rd.c, because initramfs.c defines malloc/free 
before the #include, and I would have expected gcc to just inline them in 
that case.

That's probably the right thign to do in do_mounts_rd.c too, rather than 
adding any kmalloc_track_caller() stuff.

		Linus