quoted

Could you also do sysrq-T when you see the hang. Could you post the dmesg
as well as the sysrq-T somewhere so I can take a look?

Sure, dmesg is attached. I'll send the sysrq-T after the hang.

Ok, that didn't take long, sysrq-T output attached. Access to that
mount is hung now but I will keep it running for a bit in case you
want me to grab some other info.

Shane