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: gnats-bugs%NetBSD.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/53616: dom0 crashes when dumping domU images with vnd+fss
Date: Tue, 18 Sep 2018 17:19:04 +0200

 On Tue, Sep 18, 2018 at 02:35:01PM +0000, triaxx%NetBSD.org@localhost wrote:
 > >Description:
 > I weekly backup my 3 VMs by snapshoting the associated image file:
 > 1) vndconfig over the vm.img
 > 2) mount the vnd device
 > 3) fssconfig over the mountpoint
 > 4) dd the fss device over the network
 
 Are the VMs still running while you do this ?
 If so it's no surprise that the dom0 panic: one of its mounted
 filesystem got modified in its back ... you can't have the same filesystem
 in use by 2 different OS instances at the same time.
 
 You would need to snapshot and do the backup from the VM itself.
 
 -- 
 Manuel Bouyer <bouyer%antioche.eu.org@localhost>
      NetBSD: 26 ans d'experience feront toujours la difference
 --