Running wdiff as user caused a core dump:
--- gdb backtrace ---
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libtermcap.so.2...done.
Loaded symbols for /lib/libtermcap.so.2
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
#0 0x40090b77 in mallopt () from /lib/libc.so.6
(gdb) bt
#0 0x40090b77 in mallopt () from /lib/libc.so.6
#1 0x4008f98d in free () from /lib/libc.so.6
#2 0x4007fda4 in fclose () from /lib/libc.so.6
#3 0x08049d83 in complete_input_program ()
#4 0x0804a53d in main ()
#5 0x400438c0 in __libc_start_main () from /lib/libc.so.6
--- end of backtrace ---
