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We should improve dumpVirtualMachine so it dumps the stacks of all the threads it can. It usually appears to crash on a thread a way in and then fall over.
I am trying to chase a regression in eclipse where we have a bad gc map. It would be useful to improve this output and then in a few days trawl through cattrack to try and correlate stacks to find the bad gc point.
I've put a number of commits in that fix this (e.g. not breaking on empty stacks). Looking at the stack traces in the regression reports I think this issue is now resolved.