linux-ext4 - [Bug 16312] WARNING: at fs/fs-writeback.c:1127 __mark_inode

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Message-Id: <201009161813.o8GIDLJl011203@demeter2.kernel.org>
Date:	Thu, 16 Sep 2010 18:13:21 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 16312] WARNING: at fs/fs-writeback.c:1127 __mark_inode_dirty

https://bugzilla.kernel.org/show_bug.cgi?id=16312





--- Comment #30 from Jan Kara <jack@...e.cz>  2010-09-16 18:13:21 ---
OK, Tejun, I finally read the code. So you are right that the patch doesn't
solve the race. The race seems to be in block/genhd.c:add_disk(). Once we call
register_disk(), device can be successfully opened (get_gendisk() from
blkdev_open() will succeed as soon as disk's kobject exists). But until we call
bdi_register_dev(), backing dev isn't properly initialized and thus can see the
warning. This also explains why Larry is able to see the warning even with your
patch.

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