Re: [Xen-devel] Xen 4.8.0 dom0pvh=1 causes ext4 filesystem corruption

[Steven Haigh <netwiz@xxxxxxxxx>]

On 10/03/17 02:13, Valtteri Kiviniemi wrote:
> Hi,
> 
> Yesterday I decided to upgrade my Xen version from 4.6.0 to 4.8.0. I
> compiled it from source and at the same time I compiled the latest Linux
> kernel (4.10.1).
> 
> When rebooting I decided to try if dom0 PVH would work (with previous
> Xen version it just caused kernel panic). Seemed to boot fine until
> systemd started mounting the root filesystem and then the console was
> filled with ext4 errors. Couldn't even log in.
> 
> Booting with a systemrescuecd and running fsck just caused the whole
> filesystem to be re-attached in thousands of small pieces under
> lost+found. I was sure that this was a some kind of hardware failure, so
> I switched my hard drives and did a clean reinstall for dom0 and tried
> again. Again, after a reboot the whole rootfs was completely corrupted.
> 
> Second reinstall and this time I disabled dom0 PVH and the system booted
> just fine, and no ext4 errors. My root filesystem is just a simple Linux
> software raid1 with ext4 on top of it.
> 
> Now that I started thinking I have also had strange ext4 errors
> happening inside my guests, so I also disabled PVH from all the guests.
> With guests the ext4 error is always the same: "EXT4-fs error (device
> xvda1): ext4_iget:4665: inode #317: comm find: bogus i_mode (135206)"
> 
> Unfortunately I don't have any logs from the dom0 corruption as I can't
> even log in to the system when dom0 PVH is enabled. The corruption
> happens instantly during system bootup.

I have this happen a lot using pvh mode in previous Xen versions. Is it
supposed to be 'working' yet or is it still not recommended for use?

-- 
Steven Haigh

Email: netwiz@xxxxxxxxx
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897

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