Re: kern/53616: dom0 crashes when dumping domU images with vnd+fss

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

The following reply was made to PR kern/53616; it has been noted by GNATS.

From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
To: =?iso-8859-1?Q?Fr=E9d=E9ric?= Fauberteau <triaxx%NetBSD.org@localhost>
Cc: gnats-bugs%netbsd.org@localhost, kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
        netbsd-bugs%netbsd.org@localhost, netbsd-bugs-owner%netbsd.org@localhost
Subject: Re: kern/53616: dom0 crashes when dumping domU images with vnd+fss
Date: Wed, 19 Sep 2018 07:59:17 +0200

 On Wed, Sep 19, 2018 at 07:03:28AM +0200, Frédéric Fauberteau wrote:
 > Yes they run. But my idea was to not modify the mounted fs and to dump a
 > snapshot.
 > I did that with lvm on Linux in a previous life.
 > It's true my current script did not mount the vnd device with '-o ro'
 > option.
 > I will test again by explicitly mounting my fs in read-only mode.
 
 I don't think that will help. The problem is the fs is modified by the VM
 while dom0 has it mounted.
 
 The closest way to mimic what you could do with lvm would be to snapshot
 the filesystem containing the disk images, and mount the snapshot to backup
 them.
 
 -- 
 Manuel Bouyer <bouyer%antioche.eu.org@localhost>
      NetBSD: 26 ans d'experience feront toujours la difference
 --