linux-kernel - Re: 5.0.0-rc8-next-20190301+: kernel bug at fs/inode.c:513

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190304223232.GA6323@mit.edu>
Date:   Mon, 4 Mar 2019 17:32:32 -0500
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Pavel Machek <pavel@....cz>
CC:     <adilger.kernel@...ger.ca>, <jack@...e.cz>,
        <linux-fsdevel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: 5.0.0-rc8-next-20190301+: kernel bug at fs/inode.c:513

(Adding linux-mm and moving linux-ext4 and linux-kernel to the bcc
list...)

On Mon, Mar 04, 2019 at 05:02:55PM +0100, Pavel Machek wrote:
> 
> This happened on trying to sync filesystems with unison:
> 
> Any ideas?
> 
> Should I be forcing fsck soon?
> 								Pavel
> 
> [12717.827444] ------------[ cut here ]------------
> [12717.827465] kernel BUG at fs/inode.c:513!

It seems unlikely that fsck is going to help.  The BUG_ON in question
appears to be:

	BUG_ON(inode->i_data.nrexceptional);

This is an in-memory accounting variable which seems to be related to
tracking DAX and shadow page entries --- and it seems very unlikely to
be the sort of thing triggered by an on-disk corruption.

Do you have a reliable repro for this?  If so, the next step would be
to bisect...

					- Ted