Another SIGSEGV, another mbox file

Here's the gory details:

quepasa 99% gdb /usr/local/bin/hypermail GDB is free software and you are welcome to distribute copies of it  under certain conditions; type "show copying" to see the conditions. There is absolutely no warranty for GDB; type "show warranty" for details. GDB 4.16 (i486-slackware-linux),
Copyright 1996 Free Software Foundation, Inc... (gdb) set args -p -x -m /home/wmaton/mail/law (gdb) run
Starting program: /usr/local/bin/hypermail -p -x -m /home/wmaton/mail/law Loading mailbox "/home/wmaton/mail/law"... 80 Program received signal SIGSEGV, Segmentation fault. _IO_least_marker (fp=0x8060b00) at genops.c:70 70 if (mark->_pos < least_so_far) (gdb) bt
#0 _IO_least_marker (fp=0x8060b00) at genops.c:70
#1 0x40049dd6 in save_for_backup (fp=0x8060b00) at genops.c:170
#2 0x40049f94 in __underflow (fp=0x8060b00) at genops.c:244
#3 0x4004794d in _IO_getline (fp=0x8060b00, buf=0xbfffd974 "\n", n=1023,

    delim=10, extract_delim=1) at iogetline.c:47
#4 0x400471e3 in _IO_fgets (buf=0xbfffd974 "\n", n=1024, fp=0x8060b00)

    at iofgets.c:41
#5 0x804d036 in loadheaders (mbox=0xbffff1b0 "/home/wmaton/mail/law",

    use_stdin=0, readone=0, dir=0xbfffe9b0 "law") at parse.c:886
#6 0x8053341 in main (argc=5, argv=0xbffff5e4) at hypermail.c:421
(gdb)

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wfms