#0  0x0807f741 in ast_cdr_free_vars (cdr=0xaff39310, 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=0xaff39310, recur=0) at cdr.c:411
        cur = (struct ast_var_t *) 0x6b0fc
        vardata = (struct ast_var_t *) 0x0
        headp = (struct varshead *) 0xaff396f0
#1  0x0807f9ed in ast_cdr_free (cdr=0xaff39310) at cdr.c:438
        next = (struct ast_cdr *) 0x0
        chan = 0xaff39450 "IP//\f"
        __PRETTY_FUNCTION__ = "ast_cdr_free"
#2  0x08082607 in ast_cdr_detach (cdr=0xaff39310) at cdr.c:1166
        newtail = (struct ast_cdr_batch_item *) 0x5
        curr = 135595295
        __PRETTY_FUNCTION__ = "ast_cdr_detach"
#3  0x08086b73 in ast_hangup (chan=0xaff4ae40) at channel.c:1485
        res = 0
        cdr = (struct ast_cdr *) 0xaff39310
        __PRETTY_FUNCTION__ = "ast_hangup"
#4  0x080d46ee in __ast_pbx_run (c=0xaff4ae40) at pbx.c:3287
        found = 0
        res = -1
        autoloopflag = 0
        error = 1
        __PRETTY_FUNCTION__ = "__ast_pbx_run"
#5  0x080d49a9 in pbx_thread (data=0xaff4ae40) at pbx.c:3375
        c = (struct ast_channel *) 0xaff4ae40
#6  0x08115455 in dummy_start (data=0xaff53f80) at utils.c:858
        _buffer = {__routine = 0x806d7c4 <ast_unregister_thread>, __arg = 0xb5c30ba0, __canceltype = -1245510712, __prev = 0x0}
        ret = (void *) 0xb72946f4
        a = {start_routine = 0x80d4992 <pbx_thread>, data = 0xaff4ae40,
  name = 0xaff54000 "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) bt full
#0  0x0807f741 in ast_cdr_free_vars (cdr=0xaff39310, recur=0) at cdr.c:411
        cur = (struct ast_var_t *) 0x6b0fc
        vardata = (struct ast_var_t *) 0x0
        headp = (struct varshead *) 0xaff396f0
#1  0x0807f9ed in ast_cdr_free (cdr=0xaff39310) at cdr.c:438
        next = (struct ast_cdr *) 0x0
        chan = 0xaff39450 "IP//\f"
        __PRETTY_FUNCTION__ = "ast_cdr_free"
#2  0x08082607 in ast_cdr_detach (cdr=0xaff39310) at cdr.c:1166
        newtail = (struct ast_cdr_batch_item *) 0x5
        curr = 135595295
        __PRETTY_FUNCTION__ = "ast_cdr_detach"
#3  0x08086b73 in ast_hangup (chan=0xaff4ae40) at channel.c:1485
        res = 0
        cdr = (struct ast_cdr *) 0xaff39310
        __PRETTY_FUNCTION__ = "ast_hangup"
#4  0x080d46ee in __ast_pbx_run (c=0xaff4ae40) at pbx.c:3287
        found = 0
        res = -1
        autoloopflag = 0
        error = 1
        __PRETTY_FUNCTION__ = "__ast_pbx_run"
#5  0x080d49a9 in pbx_thread (data=0xaff4ae40) at pbx.c:3375
        c = (struct ast_channel *) 0xaff4ae40
#6  0x08115455 in dummy_start (data=0xaff53f80) at utils.c:858
        _buffer = {__routine = 0x806d7c4 <ast_unregister_thread>, __arg = 0xb5c30ba0, __canceltype = -1245510712, __prev = 0x0}
        ret = (void *) 0xb72946f4
        a = {start_routine = 0x80d4992 <pbx_thread>, data = 0xaff4ae40,
  name = 0xaff54000 "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=0xaff39310, recur=0) at cdr.c:411
411                     while ((vardata = AST_LIST_REMOVE_HEAD(headp, entries)))
(gdb)