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

[mlelstv%serpens.de@localhost (Michael van Elst)]

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

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
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
 "async_exec_timeout".
 
 
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                                 Michael van Elst
 Internet: mlelstv%serpens.de@localhost
                                 "A potential Snark may lurk in every tree."