Looking for mono expert to help debug a hanging process

Hi mono folks!

We have a c# binary running under mono on Ubuntu 14.04 which hangs
periodically.

When it hangs, SIGQUIT does not generate a thread dump, and all threads,
including one heartbeat thread that does very little but pulse the logs
once a minute, seem to stop.

I've tried building with debug symbols and attaching gdb to work out where
it's stopped, but gdb segfaults when I try to get a stack trace for certain
threads.

Our executable does not contain any managed code.

I suspect that this is a mono bug, rather than something in our code per
se, though I'm not 100% sure, and I'm at somewhat of a loss as to how to
proceed with debugging it.

Does anyone have any suggestions on how to debug this? Or would be willing
to log into our machine and take a look once it's stopped? I'm willing to
pay for someone with serious gdb/mono foo to help us investigate it.

Thanks,

River

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