On multiprocessor Solaris Sparc machines, if multiple threads are concurrently throwing exceptions, and another thread is calling exit() or returning from main(), there are messages such as:

   terminate called recursively
   terminate called after throwing an instance of '

And sometimes core is dumped with an abort signal.

I have been able to reproduce this on a number of different gcc versions (4.2.0, 4.1.2, 2.95.2).  You can find the code I use to reproduce it at: http://www.csug.rochester.edu/users/ugrads/asveikau/exception_bug.cc  Note that running it once without incident does not mean the system is unaffected by the bug; keep running it until it dumps core.

The code runs file on: SunPRO C++ on the affected systems, gcc 4.1.1 on i386 linux, and gcc 3.2.3 on i386 linux.  This is why I concluded that the issue is specific to either gcc on Solaris or gcc on Sparc.  Since it works fine on Sun's compiler, I don't think it is Solaris's fault.  I don't have access to sparc linux or x86 solaris, so I couldn't narrow it down beyond that.