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Message-ID: <20120306185137.GA15881@redhat.com>
Date:	Tue, 6 Mar 2012 13:51:37 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	Fedora Kernel Team <kernel-team@...oraproject.org>,
	viro@...IV.linux.org.uk
Subject: inode->i_wb_list corruption.

We've had three separate reports against 3.2.x recently where the linked list debugging
is getting tripped up by the prev->next pointer being null instead of pointing
to the current list entry while walking the i_wb_list

Call traces are slightly different each time, but all end up walking i_wb_list 
in dput -> d_kill -> i_put -> evict -> inode_wb_list_del

What protects that list ? It looks to be just bdi->wb.list_lock ?


full reports at:
https://bugzilla.redhat.com/show_bug.cgi?id=784741
https://bugzilla.redhat.com/show_bug.cgi?id=799229
https://bugzilla.redhat.com/show_bug.cgi?id=799692

	Dave

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