#0  0x0807f741 in ast_cdr_free_vars (cdr=0xae07d6d8, recur=0) at cdr.c:411
411                     while ((vardata = AST_LIST_REMOVE_HEAD(headp, entries)))
(gdb) bt full
#0  0x0807f741 in ast_cdr_free_vars (cdr=0xae07d6d8, recur=0) at cdr.c:411
        cur = (struct ast_var_t *) 0x1b6d1
        vardata = (struct ast_var_t *) 0x0
        headp = (struct varshead *) 0xae07dab8
#1  0x0807f9ed in ast_cdr_free (cdr=0xae07d6d8) at cdr.c:438
        next = (struct ast_cdr *) 0x0
        chan = 0xae07d818 "IP//\f"
        __PRETTY_FUNCTION__ = "ast_cdr_free"
#2  0x08082607 in ast_cdr_detach (cdr=0xae07d6d8) at cdr.c:1166
        newtail = (struct ast_cdr_batch_item *) 0x5
        curr = 135595295
        __PRETTY_FUNCTION__ = "ast_cdr_detach"
#3  0x08086b73 in ast_hangup (chan=0xae0adda0) at channel.c:1485
        res = 0
        cdr = (struct ast_cdr *) 0xae07d6d8
        __PRETTY_FUNCTION__ = "ast_hangup"
#4  0x080d46ee in __ast_pbx_run (c=0xae0adda0) at pbx.c:3287
        found = 0
        res = -1
        autoloopflag = 0
        error = 1
        __PRETTY_FUNCTION__ = "__ast_pbx_run"
#5  0x080d49a9 in pbx_thread (data=0xae0adda0) at pbx.c:3375
        c = (struct ast_channel *) 0xae0adda0
#6  0x08115455 in dummy_start (data=0xae08a528) at utils.c:858
        _buffer = {__routine = 0x806d7c4 <ast_unregister_thread>, __arg = 0xb4fc3ba0, __canceltype = -1258540088, __prev = 0x0}
        ret = (void *) 0xb72946f4
        a = {start_routine = 0x80d4992 <pbx_thread>, data = 0xae0adda0,
  name = 0xae3f8f48 "pbx_thread", ' ' <repeats 11 times>, "started at [ 3396] pbx.c ast_pbx_start()"}
        __PRETTY_FUNCTION__ = "dummy_start"
#7  0xb7ea43cc in start_thread () from /lib/tls/libpthread.so.0
No symbol table info available.
#8  0xb7236c3e in clone () from /lib/tls/libc.so.6
No symbol table info available.
(gdb) f 0
#0  0x0807f741 in ast_cdr_free_vars (cdr=0xae07d6d8, recur=0) at cdr.c:411
411                     while ((vardata = AST_LIST_REMOVE_HEAD(headp, entries)))
(gdb)