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

Le 2018-09-18 17:19, Manuel Bouyer a écrit :
On Tue, Sep 18, 2018 at 02:35:01PM +0000, wrote:
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.

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.

Maybe I misunderstand and one of the commands I used does syscalls that modify fs.

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