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The bug is related to lock contention on many-core machines, and we're trying to find a machine where we reproduce the issue ourselves.
AWS, GAE, Azure, etc don't seem to have anything this size. Does anyone know where we can rent or borrow a beefy machine like this for a couple of days?
Sun used to do the same thing back in the day, not sure since Oracle took over, but it would be worth a call. IBM/HP also might have a lab environment where you can test on.
Maybe call the machine vendor your client used for that machine and explain what you need, you'd be surprised how accommodating they can be. It won't be free, but it likely is far far cheaper than a 60 core machine.
Good luck!
Look into used UltraSPARC hardware. T3/T4/T5 all should offer >100 cores, or start building a beowulf cluster with in house computers.
You might check with a couple of the OS/hardware vendors too. I know Microsoft used to have labs on both east and west coasts that allow you to do this type of debugging, I would imagine they still do. Sun used to do the same thing back in the day, not sure since Oracle took over, but it would be worth a call. IBM/HP also might have a lab environment where you can test on. Maybe call the machine vendor your client us…
http://www.ebay.com/itm/DELL-C6145-SERVER-QUAD-AMD-6168-1-90...
OVH.co.uk/OVH.us do a 40 thread server
If you're not scared of a "weird" architecture, http://labs.runabove.com/power8/ gets you a lot of threads at a very low price.
EDIT: Yes, yes I am. Power8 architecture. Probably not best for attempting to reproduce client bugs :-)