On i686 Fedora, under valgrind, when running the following code, we get a GPF:

==16456== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==16456==  General Protection Fault
==16456==    at 0x80485B4: main (test.c:23)

while gdb on the core yields that

Program terminated with signal SIGSEGV, Segmentation fault.
#0  main (argc=1, argv=0xbecaac44) at test.c:23
23		buf[MAX_GP_STRERROR -1] = '\0';

This has been in gssproxy for some time, and we believe it was previously working.