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Thread-related segfault with cygwin 1.5.19-4

I've compiled and rebuilt the FlightGear application under a fresh
installation of cygwin (I've been doing this for years, now) and when
running flightgear I get a segfault at startup - something I've not seen

When running under gdb, this is the message I get:

Program received signal SIGSEGV, Segmentation fault.
0x610ae938 in pthread_key_create () from /usr/bin/cygwin1.dll

Typing "where" in gdb gives this trace:

(gdb) where
#0  0x610ae938 in pthread_key_create () from /usr/bin/cygwin1.dll
#1  0x6108dd7f in _sigfe () from /usr/bin/cygwin1.dll
#2  0x59432d52 in ?? ()
#3  0x10022488 in ?? ()
#4  0x10022458 in ?? ()
#5  0x10022488 in ?? ()
#6  0x0022ed88 in ?? ()
#7  0x610af6b7 in pthread::once () from /usr/bin/cygwin1.dll
#8  0x610af6b7 in pthread::once () from /usr/bin/cygwin1.dll
#9  0x6108dd7f in _sigfe () from /usr/bin/cygwin1.dll
#10 0x0022edb8 in ?? ()
#11 0x009aaa05 in _Unwind_SjLj_Register ()
#12 0x009aaa05 in _Unwind_SjLj_Register ()
#13 0x004011ad in main ()

I've checked with the mailing list and don't see a related question. Does
the above trace suggest a problem with pthread implementation in cygwin, or
does the first hint of trouble appear with the Unwind...() call? The "?" in
line #10 in the "where" trace seems fishy, to me.

Any suggestions on where to look next for help will be appreciated.


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