Fair enough :) Here is the gdb output: (gdb) run Starting program: /Users/adinapoli/Library/Haskell/ghc-7.6.2/bin/threadscope Reading symbols for shared libraries ++++++++++++++++++....................................................................................................................................................................... done Reading symbols for shared libraries . done Reading symbols for shared libraries . done Reading symbols for shared libraries . done Reading symbols for shared libraries . done Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000000 0x0000000000000000 in ?? () I have two hypothesis: a) could be the RAM (tips about some RAM testing tool?) b) could be some programs which is writing in that portion of memory, see: https://discussions.apple.com/thread/3734077?start=0&tstart=0 On 30 March 2013 15:19, John Wiegley wrote:

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Alfredo Di Napoli writes:

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I know it's a bit difficult to debug this way, I can try debugging with gdb if it can help.

Yes, can you show us a backtrace from gdb, and also look in your CrashReports log folder to see if it gives a bit more information on the state of the process at the time it died?

Thanks, -- John Wiegley FP Complete Haskell tools, training and consulting http://fpcomplete.com johnw on #haskell/irc.freenode.net

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Hi Tobias,

What do you mean by _some_ program? It's the program that you started (threadscope).

In a forum I've read that this error could be some third party app (for example one started at login or running as a daemon) which is conflicting and causing the error. Unlikely, but i've reported the possibility for completeness. Said that,has someone had any luck in running Threadscope on Mac OS X 10.8 at all? Thanks, A.