linux-kernel - Re: Top kernel oopses/warnings for the week of May 16th 2008

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Message-id: <482E3B1B.9070400@shaw.ca>
Date:	Fri, 16 May 2008 19:55:39 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	NetDev <netdev@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeff Garzik <jgarzik@...ox.com>, andrea@...ranet.com,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: Top kernel oopses/warnings for the week of May 16th 2008

Arjan van de Ven wrote:
> Rank 10: __alloc_pages
>     Reported 16 times (31 total reports)
>     Sleeping allocation in interrupt context, some in netlink, some in 
> the nv sata driver
>     This oops was last seen in version 2.6.25.3, and first seen in 
> 2.6.18-rc1.
>     More info: 
> http://www.kerneloops.org/searchweek.php?search=__alloc_pages

In the case of the sata_nv error, it appears this is happening now 
because blk_queue_bounce_limit is initializing emergency ISA pools which 
can't be done under spinlock. This is happening because the code in 
blk_queue_bounce_limit now thinks that a 32-bit DMA mask requires 
allocating with GFP_DMA. This is only needed for a DMA mask less than 
32-bit, which is what the original code did. It looks like this was 
broken by this commit:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=00d61e3e8c12d5f395b167856d2b3c430816afb0

author	Andrea Arcangeli <andrea@...ranet.com>
	Wed, 2 Apr 2008 07:06:44 +0000 (09:06 +0200)
committer	Jens Axboe <jens.axboe@...cle.com>
	Wed, 2 Apr 2008 07:06:44 +0000 (09:06 +0200)

Fix bounce setting for 64-bit

Not sure what this was intended to fix, but I don't think it's right..
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