linux-ext4 - Re: kernel oops in jbd2_journal_get_descriptor

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Message-ID: <20121011152828.GA8001@quack.suse.cz>
Date:	Thu, 11 Oct 2012 17:28:28 +0200
From:	Jan Kara <jack@...e.cz>
To:	Clement Gallin-Douathe <c-gallin-douathe@...com>
Cc:	Jan Kara <jack@...e.cz>, tytso@....edu, adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org
Subject: Re: kernel oops in jbd2_journal_get_descriptor_buffer

On Thu 11-10-12 17:22:49, Clement Gallin-Douathe wrote:
> Jan,
> 
> Thanks for your answer.
> I have checked and I have no tricks with mapping flags (mount ext4
> options : rw,nosuid,nodev,noatime,errors=continue,data=ordered)
> I have added high mem verification on grow_dev_page function just
> after the page creation with find_or_create_page function.
> PageHighMem() is not null.
> So you think, it's a good idea to look into mm/page_alloc.c and
> verify gfp flags?
  Yep. Check what gfp flags are passed to find_or_create_page() and if
there if no __GFP_HIGH set, drill down into find_or_create_page() and
further to mm/page_alloc.c to find out where we get the page from.

								Honza
> On 10/11/2012 11:59 AM, Jan Kara wrote:
> >!__GFP_HIGH in particular. So does the device ext4 is mounted on play
> >some tricks with mapping fl
> 
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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