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This has been reported before. Maybe these two bugs should
me merged somehow:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1167262&group_id=5470

The older bug report states that it's an assertion error,
not a crash. That's consistent with the recent security
clean-up of the CRT in VS 2005. I don't think that MS will
fix this, since they are the ones which added the extra
assertions. I've looked through the source code of the .NET
2003 version and it works as in ANSI-C (SIG_ERR is returned
for unknown signals).