Re: [Xen-devel] dom0pvh issue with XEN 4.8.0

[Steven Haigh <netwiz@xxxxxxxxx>]

On Sunday, 5 February 2017 4:05:32 PM AEDT G.R. wrote:
> Hi all,
> dom0pvh=1 is not working well for me with XEN 4.8.0 + linux kernel 4.9.2.
> 
> The system boots with no obvious issue.
> But many user mode application are suffering from segfault, which
> makes the dom0 not useable: The segfault always come from libc-2.24.so
> while it works just fine in PV dom0.
> I have no idea why, but those segfault would kill my ssh connection
> while sshd is not showing up in the victim list.
> 
> Some examples:
> Feb  5 14:25:28 gaia kernel: [  123.446346] getty[3044]: segfault at 0
> ip 00007f5e769e6c60 sp 00007ffc57bc0a98 error 6 in
> libc-2.24.so[7f5e769b7000+195000]
> Feb  5 14:29:04 gaia kernel: [  339.671742] grep[4195]: segfault at 0
> ip 00007f5d3b95ac60 sp 00007ffcc1620bb8 error 6 in
> libc-2.24.so[7f5d3b92b000+195000]
> Feb  5 14:29:23 gaia kernel: [  358.495888] tail[4203]: segfault at 0
> ip 00007f751314bc60 sp 00007fffe5ce5e48 error 6 in
> libc-2.24.so[7f751311c000+195000]
> Feb  5 14:35:06 gaia kernel: [  701.314247] bash[4323]: segfault at 0
> ip 00007f3fef30ec60 sp 00007ffd48cc2058 error 6 in
> libc-2.24.so[7f3fef2df000+195000]
> Feb  5 14:48:43 gaia kernel: [ 1518.809924] ls[4910]: segfault at 0 ip
> 00007f29e9bc1c60 sp 00007ffd712752b8 error 6 in
> libc-2.24.so[7f29e9b92000+195000]
> 
> Any suggestion on how to get this fixed?
> I don't think I can do live debug since the userspace is quite unstable.
> On the other hand, dmesg from both dom0 && XEN looks just fine.
> 
> PS: I'm using a custom compiled dom0 kernel. Is there any specific
> kernel config is required to get dom0pvh=1 work?

I've been down this path before - and the only thing that gave me stability 
back was to disable the pvh options. I had everything from disk corruption to 
what you mention with apps while trying this option.

-- 
Steven Haigh

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

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