On Mon, Nov 19, 2007 at 01:57:04AM +0100, Jan Christoph Nordholz wrote:
> Now I have at least a faint idea what I should be looking for in the source
> code... maybe you could speed it up by setting a watchpoint?
>
> 1. start rxvt-xterm inside gdb
> 2. fire up mutt, open the first mail
> 3. CTRL+C...
>
> ] (gdb) p screen.text[TermWin.saveLines]
> // check: should be the top line of your window
> ] (gdb) watch (void *)screen.text[TermWin.saveLines]
> ] Hardware watchpoint 1: (void *)screen.text[TermWin.saveLines]
> ] (gdb) c
> ] Continuing.
>
> 4. Try to reproduce the crash.
>
> Now it should not get to the segfault, but interrupt somewhere in between
> (exactly at the position where those buffer pointers are altered).
> I guess I don't need a core file then - a 'bt full' should provide all
> that's necessary to guide my search. ;)
Okay...
(gdb) r
Starting program: /home/joy/QA/rxvt/rxvt-2.6.4/src/rxvt-xterm
Program received signal SIGTSTP, Stopped (user).
0x00002b0ce3dd9a75 in select () from /lib/libc.so.6
(gdb) p screen.text[TermWin.saveLines]
$1 = (
text_t *) 0x54dfa0 "i:Exit -:PrevPg <Space>:NextPg v:View Attachm. d:Del
r:Reply j:Next ?:Help "
(gdb) watch (void *)screen.text[TermWin.saveLines]
Hardware watchpoint 1: (void *) screen.text[TermWin.saveLines]
(gdb) c
Continuing.
Program received signal SIGTSTP, Stopped (user).
0x00002b0ce3dd9a75 in select () from /lib/libc.so.6
(gdb) c
Continuing.
Hardware watchpoint 1: (void *) screen.text[TermWin.saveLines]
Old value = (void *) 0x54dfa0
New value = (void *) 0x543a10
scroll_text (row1=0, row2=518, count=10, spec=0) at screen.c:803
803 screen.tlen[j] = screen.tlen[j + count];
(gdb) c
Continuing.
[here it's actually just stuck again... so I press Ctrl+Z]
Program received signal SIGTSTP, Stopped (user).
0x00000000004102e2 in scr_add_lines (
str=0x51cdcc "***** Nagios *****\r\n\nNotification Type: PROBLEM\r\nHost:
nekkar.CARNet.hr\r\nState: DOWN\r\nAddress:
161.53.160.239\r\nInfo:\r\n\nCRITICAL - Host Unreachable
(161.53.160.239)\r\n\nDate/Time: Sun Jul 22 15:43:45 CE"..., nlines=-4,
len=207) at screen.c:1012
1012 stp[screen.cur.col] = c;
(gdb) bt full
#0 0x00000000004102e2 in scr_add_lines (
str=0x51cdcc "***** Nagios *****\r\n\nNotification Type: PROBLEM\r\nHost:
nekkar.CARNet.hr\r\nState: DOWN\r\nAddress:
161.53.160.239\r\nInfo:\r\n\nCRITICAL - Host Unreachable
(161.53.160.239)\r\n\nDate/Time: Sun Jul 22 15:43:45 CE"..., nlines=-4,
len=207) at screen.c:1012
c = 42 '*'
i = 1
j = 0
row = 509
last_col = 80
checksel = 0
clearsel = 0
stp = (text_t *) 0x0
srp = (u_int16_t *) 0x0
#1 0x0000000000408d47 in main_loop () at command.c:3307
nlines = 10
ch = 27 '\033'
str = (
unsigned char *) 0x51cdcc "***** Nagios *****\r\n\nNotification Type:
PROBLEM\r\nHost: nekkar.CARNet.hr\r\nState: DOWN\r\nAddress:
161.53.160.239\r\nInfo:\r\n\nCRITICAL - Host Unreachable
(161.53.160.239)\r\n\nDate/Time: Sun Jul 22 15:43:45 CE"...
#2 0x000000000040cd40 in main (argc=1, argv=0x7fffc70b26d8) at main.c:1434
---Type <return> to continue, or q <return> to quit---
cmd_argv = (const char **) 0x0
(gdb)
--
2. That which causes joy or happiness.
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