[OpenSIPS-Devel] trying to examine presence/timer crash

[Juha Heinanen]

i tried to figure out why i'm getting the presence/timer crashes, but
don't know how to access the argument value of a function.

(gdb) where
#0  0xb758e3e3 in db_mysql_val2bind (v=0xbfcbdf3c, binds=0x8188190, i=1)
    at val.c:274
#1  0xb758993e in db_mysql_do_prepared_query (conn=<value optimized out>, 
    v=<value optimized out>, n=2, uv=0x0, un=0, query=<value optimized out>)
    at dbase.c:443
#2  0xb758b0dd in db_mysql_delete (_h=0x817c1a0, _k=0xbfcbdf70, 
    _o=0xbfcbdf64, _v=0xbfcbdf28, _n=2) at dbase.c:893
#3  0xb723dea4 in msg_watchers_clean (ticks=3600, param=0x0)
    at subscribe.c:484
#4  0x080b64cf in timer_ticker () at timer.c:325
#5  run_timer_process () at timer.c:395
#6  start_timer_processes () at timer.c:475
#7  0x08069ea3 in main_loop (argc=16, argv=0xbfcbe134) at main.c:867
#8  main (argc=16, argv=0xbfcbe134) at main.c:1388

i would like know what struct db_val_t* argument v of of
db_mysql_do_prepared_query function contains:

static int db_mysql_do_prepared_query(const db_con_t* conn, const str *query,
	const db_val_t* v, int n, const db_val_t* uv, int un)

i go to frame 1

(gdb) frame 1
#1  0xb758993e in db_mysql_do_prepared_query (conn=<value optimized out>, 
    v=<value optimized out>, n=2, uv=0x0, un=0, query=<value optimized out>)
    at dbase.c:443
443			if (db_mysql_val2bind( v+i , mysql_bind, i)<0 ) {

and check args:

(gdb) info args
conn = <value optimized out>
v = <value optimized out>
n = 2
uv = 0x0
un = 0
query = <value optimized out>

(gdb) whatis v
type = const db_val_t *

but when i try to print type field of first v value, i get an error:

(gdb) print v->type
Cannot access memory at address 0x0

same for other fields of v.

what is it that i'm doing wrong?

-- juha