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Re: port-xen/50659: Xen4.5 crash with vnds

The following reply was made to PR kern/50659; it has been noted by GNATS.

From: (Michael van Elst)
Subject: Re: port-xen/50659: Xen4.5 crash with vnds
Date: Wed, 23 Mar 2016 00:34:07 +0000 (UTC)

 kre%munnari.OZ.AU@localhost (Robert Elz) writes:
 >Given that the error reported here is EBUSY, I looked in the driver for
 >causes for that.
 The EBUSY comes from specfs that prevents opening a block device twice.
 This happens because the /usr/pkg/etc/xen/scripts/block script is run
 concurrently (you see the intermixed output from at least 3 incarnations)
 so one process configures vnd0 and the next tries to do the same.
 Apparently the block script also hangs because it gets killed by
                                 Michael van Elst
                                 "A potential Snark may lurk in every tree."

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