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SubjectRe: 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

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