[350] in bug-owl
owl hung on me this morning
daemon@ATHENA.MIT.EDU (Chris Shabsin)
Tue Sep 14 10:20:54 2004
Message-ID: <4146FE19.3000100@mit.edu>
Date: Tue, 14 Sep 2004 10:20:09 -0400
From: Chris Shabsin <crs@MIT.EDU>
MIME-Version: 1.0
To: bug-owl@mit.edu
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I was M-p'ing through history, hit a wrong key, and got owl to hang. I
attached to it in the debugger.
(gdb) where
#0 0x40227777 in strchr () from /lib/libc.so.6
#1 0x00000002 in ?? ()
#2 0x080684e1 in _owl_editwin_get_index_from_xy (e=0x80c0958) at
editwin.c:483
#3 0x080689cf in owl_editwin_delete_nextword (e=0x80c0958) at editwin.c:712
#4 0x0807e149 in owl_cmd_execute (cmd=0x80d98f0, cd=0x80c08bc,
ctx=0x80c08c8, argc=1,
argv=0x8ffd3f0, cmdbuff=0x80e0260 "edit:delete-next-word") at cmd.c:186
#5 0x0807dd1a in owl_cmddict_execute (cd=0x80c08bc, ctx=0x80de2bc,
cmdbuff=0x80e0260 "edit:delete-next-word") at cmd.c:79
#6 0x0806ff89 in owl_function_command (cmdbuff=0x80e0260
"edit:delete-next-word")
at functions.c:25
#7 0x0806ffb1 in owl_function_command_norv (
cmdbuff=0x80de2bc "thanks. guess i'll do that\n") at functions.c:32
#8 0x0807d690 in owl_keyhandler_process (kh=0x80c0820, j=228) at
keymap.c:262
#9 0x0805cb20 in main (argc=135006156, argv=0xe4, env=0xbffff66c) at
owl.c:667
(gdb) up
#1 0x00000002 in ?? ()
(gdb) up
#2 0x080684e1 in _owl_editwin_get_index_from_xy (e=0x80c0958) at
editwin.c:483
483 ptr2=strchr(ptr1, '\n');
(gdb) list
478 if (e->bufflen==0) return(0);
479
480 /* first go to the yth line */
481 ptr1=e->buff;
482 for (i=0; i<e->buffy; i++) {
483 ptr2=strchr(ptr1, '\n');
484 if (!ptr2) {
485 /* we're already on the last line */
486 break;
487 }
(gdb) p ptr1
$1 = 0x80de2bc "thanks. guess i'll do that\n"
(gdb) list
488 ptr1=ptr2+1;
489 }
490
491 /* now go to the xth character */
492 ptr2=strchr(ptr1, '\n');
493 if (!ptr2) {
494 ptr2=e->buff+e->bufflen;
495 }
496
497 if ((ptr2-ptr1) < e->buffx) {
(gdb) n
Single stepping until exit from function strchr,
which has no line number information.
[Switching to Thread 16384 (LWP 17481)]
_owl_editwin_get_index_from_xy (e=0x80c0958) at editwin.c:484
484 if (!ptr2) {
(gdb)
482 for (i=0; i<e->buffy; i++) {
(gdb)
488 ptr1=ptr2+1;
(gdb) p i
$3 = 2
(gdb) p e
$4 = (owl_editwin *) 0x80c0958
(gdb) p e->buffy
$5 = 2
(gdb) p ptr1
$6 = 0x80de2bc "thanks. guess i'll do that\n"
(gdb) p ptr2
$7 = 0xa0a0a0a <Address 0xa0a0a0a out of bounds>
(gdb) n
482 for (i=0; i<e->buffy; i++) {
(gdb)
492 ptr2=strchr(ptr1, '\n');
(gdb)
493 if (!ptr2) {
(gdb) p ptr2
$8 = 0xa0a0a0a <Address 0xa0a0a0a out of bounds>
(gdb) p ptr1
$9 = 0x80de2d8 ""
(gdb) n
492 ptr2=strchr(ptr1, '\n');
(gdb)
493 if (!ptr2) {
(gdb) p ptr2
$10 = 0x0
(gdb) n
494 ptr2=e->buff+e->bufflen;
(gdb) n
497 if ((ptr2-ptr1) < e->buffx) {
(gdb) p ptr2
$11 = 0x80de2d8 ""
(gdb) p ptr1
$12 = 0x80de2d8 ""
(gdb) p e->buffx
$13 = 0
(gdb) n
500 ptr1+=e->buffx;
(gdb) list
495 }
496
497 if ((ptr2-ptr1) < e->buffx) {
498 ptr1=ptr2-1;
499 } else {
500 ptr1+=e->buffx;
501 }
502
503 /* printf("DEBUG: index is %i\r\n", ptr1-e->buff); */
504 return(ptr1-e->buff);
(gdb) p ptr2
$14 = 0x80de2d8 ""
(gdb) p ptr1
$16 = 0x80de2d8 ""
(gdb) n
505 }
(gdb) n
owl_editwin_delete_nextword (e=0x80c0958) at editwin.c:713
713 if (e->buff[z+1]==' ' || e->buff[z+1]=='\n' ||
e->buff[z+1]=='\0') break;
(gdb) list
708 }
709
710 /* then nuke the next word */
711 while (1) {
712 z=_owl_editwin_get_index_from_xy(e);
713 if (e->buff[z+1]==' ' || e->buff[z+1]=='\n' ||
e->buff[z+1]=='\0') break;
714 owl_editwin_delete_char(e);
715 }
716 owl_editwin_delete_char(e);
717 }
(gdb) p e->buff
$17 = 0x80de2a8 "----> zwrite mccall\nthanks. guess i'll do that\n"
(gdb) p z
$18 = 48
(gdb) p e->buff+z
$19 = 0x80de2d8 ""
(gdb) p e->buff+z+1
$20 = 0x80de2d9 "kery makes good muffins.\n"
(gdb) p z
$22 = 48
(gdb) p &z
Address requested for identifier "z" which is in register $edx
(gdb) set z=47
(gdb) p z
$24 = 47
(gdb) c
Continuing.
Make of this what you will.
-Chris
