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panic on 4.20 server exporting xfs filesystem

To: Christoph Hellwig <hch@xxxxxx>
Subject: panic on 4.20 server exporting xfs filesystem
From: "J. Bruce Fields" <bfields@xxxxxxxxxxxx>
Date: Tue, 3 Mar 2015 17:10:33 -0500
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, linux-nfs@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
User-agent: Mutt/1.5.21 (2010-09-15)
I'm getting mysterious crashes on a server exporting an xfs filesystem.

Strangely, I've reproduced this on

        93aaa830fc17 "Merge tag 'xfs-pnfs-for-linus-3.20-rc1' of 

but haven't yet managed to reproduce on either of its parents
(24a52e412ef2 or 781355c6e5ae).  That might just be chance, I'll try

I can also try a serial console or something, but for now I'm not
getting a lot of information about the crashes.

The filesystem in question isn't on a block device available to the
client, but I'm still seeing occasional GETLAYOUT and GETDEVICEINFO
calls; I suppose the client's getting that far, finding no devices it
can use, and giving up?

Sorry for the incomplete report, I'll pass along more when I have it.


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