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SubjectRe: 2.6.25-rc7-git2: Reported regressions from 2.6.24


On Thu, 27 Mar 2008, Rafael J. Wysocki wrote:
>
> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=9412
> Subject : commit a878539ef994787c447a98c2e3ba0fe3dad984ec breaks boot on SB600 AHCI
> Submitter : Srihari Vijayaraghavan <sriharivijayaraghavan@yahoo.com.au>
> Date : 2008-03-12 17:15 (16 days old)
> Handled-By : Jeff Garzik <jgarzik@pobox.com>
> Richard Zhao <richard.zhao@amd.com>

Fixed by 4cde32fc4b32e96a99063af3183acdfd54c563f0, methinks.

> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=9962
> Subject : mount: could not find filesystem
> Submitter : Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
> Date : 2008-02-12 14:34 (45 days old)
> References : http://lkml.org/lkml/2008/2/12/91
> Handled-By : Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> Yinghai Lu <yhlu.kernel@gmail.com>

Needs more info. The original oops that opened it is fixed, but..

> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=9976
> Subject : BUG: 2.6.25-rc1: iptables postrouting setup causes oops
> Submitter : Ben Nizette <bn@niasdigital.com>
> Date : 2008-02-12 12:46 (45 days old)
> References : http://lkml.org/lkml/2008/2/12/148
> Handled-By : Haavard Skinnemoen <hskinnemoen@atmel.com>

This one seems gone (and was apparently AVR-only):

http://lkml.org/lkml/2008/2/13/607:
"What ever the problem is it isn't immediately apparent in latest git so
I guess we'll just have to keep our eyes peeled."

> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=9978
> Subject : 2.6.25-rc1: volanoMark regression
> Submitter : Zhang, Yanmin <yanmin_zhang@linux.intel.com>
> Date : 2008-02-13 10:30 (44 days old)
> References : http://lkml.org/lkml/2008/2/13/128
> http://lkml.org/lkml/2008/3/12/52
> http://lkml.org/lkml/2008/3/18/81
> Handled-By : Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
> Balbir Singh <balbir@linux.vnet.ibm.com>

Hmm. It is a regression on one machine (2x quad-core stoakley), but not
another (4x quad-core tigerton).

Interestingly, the stoakley box numbers have apparently been all over the
map.

> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=10318
> Subject : WARNING: at arch/x86/mm/highmem_32.c:43 kmap_atomic_prot+0x87/0x184()
> Submitter : Pawel Staszewski <pstaszewski@artcom.pl>
> Date : 2008-03-25 02:50 (3 days old)

Andrew and seems to have debugged this down to a kzalloc(GFP_ATOMIC) or
similar.

I wonder if the bug is in that commit
3811dbf67162bd08412f1b0e02e554f353e93bdb ("SLUB: remove useless masking
of GFP_ZERO"), because I don't think that masking was at all useless and I
think my original 7fd272550bd43cc1d7289ef0ab2fa50de137e767 was correct.

That apparently bogus commit says "GFP_ZERO is already masked out in
new_slab()", but gfpflags is not just used for new_slab(), but for
kmalloc_large() too. Which does *not* clear GFP_ZERO.

Pawel, does reverting 3811dbf67162bd08412f1b0e02e554f353e93bdb fix it for
you?

Also, Rafael - do these reminder emails also go to the people who are
mentioned in the regressions (especially people who are set up as being
"hanled-by" or having patches for the problem)?

Linus


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