Further investigation on the weather station server has revealed masses of the following errors:
kernel: AMD-Vi: Event logged [IO_PAGE_FAULT device=00:13.0 domain=0x0008 address=0x0000000000000080 flags=0x0020]

It would appear the new kernel has picked up the IOMMU error reported in RH bugzilla 1274527

Cheers
Bill 
 
-----Original message-----
> From:Bill Maidment <[log in to unmask]>
> Sent: Thursday 17th December 2015 17:02
> To: Connie Sieh <[log in to unmask]>
> Cc: Pat Riehecky <[log in to unmask]>; [log in to unmask]
> Subject: RE: [SCIENTIFIC-LINUX-DEVEL] Posted for testing: 7.2 security updates (SL7)
> 
> Hi
> I've had a chance to reinstall the new kernel on the problem machine again, and it still kernel panics on boot. This machine has usb keyboard and mouse.
> I have another machine which refuses to recognize my usb weather station (Bus 005 Device 002: ID 0fde:ca01 Oregon Scientific WMRS200 weather station), but is quite happy on the older kernel.
> I believe the new kernel has a usb issue.
> 
> Cheers
> Bill
>  
> -----Original message-----
> > From:Connie Sieh <[log in to unmask]>
> > Sent: Wednesday 16th December 2015 9:57
> > To: Bill Maidment <[log in to unmask]>
> > Cc: Pat Riehecky <[log in to unmask]>; [log in to unmask]
> > Subject: RE: [SCIENTIFIC-LINUX-DEVEL] Posted for testing: 7.2 security updates (SL7)
> > 
> > On Tue, 15 Dec 2015, Bill Maidment wrote:
> > 
> > > Hi Pat I have tested the updates from sl-testing on several machines and 
> > > all bar one have not caused any issues. The one issue I had was with an 
> > > older machine which gives a kernel panic on boot using 
> > > kernel-3.10.0-327.3.1.el7.x86_64 If I revert to 
> > > kernel-3.10.0-229.20.1.el7.x86_64 then the machine boots OK and 
> > > everything runs OK.
> > >
> > > I don't have access to this particular machine today, but I will try a 
> > > reinstall of the new kernel tomorrow (Australian time) and see if I can 
> > > replicate the issue.
> > >
> > > Cheers
> > > Bill Maidment
> > >
> > >
> > >
> > Bill,
> > 
> > Thanks for testing.
> > -- 
> > 
> > Connie J. Sieh
> > Computing Services Specialist III
> > 
> > Fermi National Accelerator Laboratory
> > 630 840 8531 office
> > 
> > http://www.fnal.gov
> > [log in to unmask]
> > 
> > 
> 
>