Caugh in a loop? - Gammon Forum

Well the MUD freezes (has happened twice), and I attach gdb to see this:

#0  0x00400402 in ?? ()
#1  0x00210826 in gettimeofday () from /lib/libc.so.6
#2  0x080e600f in start_timer (stime=0xbfa3eb04) at interp.c:1039
#3  0x080e5474 in interpret (ch=0x8f46150, argument=0xbfa3fb42 "") at interp.c:584
#4  0x0810a606 in mprog_do_command (cmnd=0xbfa40814 "  east", mob=0x8f46150, actor=0x8f477d0, obj=0x0, vo=0x0,
    rndm=0x8f477d0, ignore=0 '\0', ignore_ors=0 '\0') at mud_prog.c:2464
#5  0x0810a0dd in mprog_driver (
    com_list=0x8ece4c0 "if istransformed($n)\n\r  say ALIEN!!!\n\r  scream\n\r  west\n\r  east\n\r  south\n\r  north\n\rendif\n\r", mob=0x8f46150, actor=0x8f477d0, obj=0x0, vo=0x0, single_step=0 '\0') at mud_prog.c:2162
#6  0x0810ae14 in mprog_percent_check (mob=0x8f46150, actor=0x8f477d0, obj=0x0, vo=0x0, type=7) at mud_prog.c:2676
#7  0x0810b3d2 in mprog_greet_trigger (ch=0x8f477d0) at mud_prog.c:2929
#8  0x080615be in move_char (ch=0x8f477d0, pexit=0x8edd070, fall=0, running=0 '\0') at act_move.c:1351
#9  0x080617ef in do_east (ch=0x8f477d0, argument=0xbfa43575 "") at act_move.c:1389
#10 0x080e5486 in interpret (ch=0x8f477d0, argument=0xbfa43575 "") at interp.c:585
#11 0x080b8cd2 in game_loop () at comm.c:972
#12 0x080b8073 in main (argc=2, argv=0xbfa44ad4) at comm.c:340

[EDIT] Here's a better gdb:

#0  0x0810ac41 in mprog_wordlist_check (arg=0xbfa3fb42 "ALIEN!!! SOMEONE HELP ME!!!", mob=0x8f42b38, actor=0x8f44da0,
    obj=0x0, vo=0x0, type=1) at mud_prog.c:2626
#1  0x0810b546 in mprog_speech_trigger (txt=0xbfa3fb42 "ALIEN!!! SOMEONE HELP ME!!!", actor=0x8f44da0) at mud_prog.c:2983
#2  0x0804ba35 in do_say (ch=0x8f44da0, argument=0xbfa3fb42 "ALIEN!!! SOMEONE HELP ME!!!") at act_comm.c:1043
#3  0x080e5486 in interpret (ch=0x8f44da0, argument=0xbfa3fb42 "ALIEN!!! SOMEONE HELP ME!!!") at interp.c:585
#4  0x0810a606 in mprog_do_command (cmnd=0xbfa407f2 "  say ALIEN!!! SOMEONE HELP ME!!!", mob=0x8f44da0, actor=0x8f477d0,
    obj=0x0, vo=0x0, rndm=0x8f477d0, ignore=0 '\0', ignore_ors=0 '\0') at mud_prog.c:2464
#5  0x0810a0dd in mprog_driver (
    com_list=0x8ece770 "if istransformed($n)\n\r  say ALIEN!!! SOMEONE HELP ME!!!\n\r  scream\n\r  west\n\r  east\n\r  south\n\r  north\n\rendif\n\r", mob=0x8f44da0, actor=0x8f477d0, obj=0x0, vo=0x0, single_step=0 '\0') at mud_prog.c:2162
#6  0x0810ae14 in mprog_percent_check (mob=0x8f44da0, actor=0x8f477d0, obj=0x0, vo=0x0, type=7) at mud_prog.c:2676
#7  0x0810b3d2 in mprog_greet_trigger (ch=0x8f477d0) at mud_prog.c:2929
#8  0x080615be in move_char (ch=0x8f477d0, pexit=0x8edd070, fall=0, running=0 '\0') at act_move.c:1351
#9  0x080617ef in do_east (ch=0x8f477d0, argument=0xbfa43575 "") at act_move.c:1389
#10 0x080e5486 in interpret (ch=0x8f477d0, argument=0xbfa43575 "") at interp.c:585
#11 0x080b8cd2 in game_loop () at comm.c:972
#12 0x080b8073 in main (argc=2, argv=0xbfa44ad4) at comm.c:340

(gdb) f 0
#0  0x0810ac41 in mprog_wordlist_check (arg=0xbfa3fb42 "ALIEN!!! SOMEONE HELP ME!!!", mob=0x8f42b38, actor=0x8f44da0,
    obj=0x0, vo=0x0, type=1) at mud_prog.c:2626
2626            for ( i = 0; i < strlen( dupl ); i++ )

Both loops had the same gdb. I have no clue at all. Plus why is frame 0 "??"... The latest thing I added was qbits/abits.

Is it possible to cause a loop by a prog?

Here's the prog:

>greet_prog 100
if istransformed($n)
  say ALIEN!!! SOMEONE HELP ME!!!
  scream
  west
  east
  south
  north
endif

istransformed checks for a char flag.