linux-kernel - Re: 2.6.25-rc7-git2: Reported regressions from 2.6.24

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Date:	Thu, 27 Mar 2008 19:30:35 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Pawel Staszewski <pstaszewski@...com.pl>,
	Christoph Lameter <clameter@....com>
cc:	LKML <linux-kernel@...r.kernel.org>, Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>
Subject: Re: 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@...oo.com.au>
> Date		: 2008-03-12 17:15 (16 days old)
> Handled-By	: Jeff Garzik <jgarzik@...ox.com>
> 		  Richard Zhao <richard.zhao@....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@...ux.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@...il.com>
> 		  Yinghai Lu <yhlu.kernel@...il.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@...sdigital.com>
> Date		: 2008-02-12 12:46 (45 days old)
> References	: http://lkml.org/lkml/2008/2/12/148
> Handled-By	: Haavard Skinnemoen <hskinnemoen@...el.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@...ux.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@...ux.vnet.ibm.com>
> 		  Balbir Singh <balbir@...ux.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@...com.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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