(gdb) up
#1  0xb791e7d3 in stop_spying (chan=0x820d9d0, spy=0xb78818b0) at app_chanspy.c:190
190             ast_channel_spy_remove(chan, spy);

(gdb) down
#0  0x0806272f in ast_channel_spy_remove (chan=0x820d9d0, spy=0xb78818b0) at channel.c:1052
1052                    while (curspy->list.next != (spy))

(gdb) l
1047                    (&chan->spies->list)->first = (spy)->list.next;
1048                    if ((&chan->spies->list)->last == (spy))
1049                            (&chan->spies->list)->last = NULL;
1050            } else {
1051                    typeof(spy) curspy = (&chan->spies->list)->first;
1052                    while (curspy->list.next != (spy))
1053                            curspy = curspy->list.next;
1054                    curspy->list.next = (spy)->list.next;
1055                    if ((&chan->spies->list)->last == curspy->list.next)
1056                            (&chan->spies->list)->last = curspy;

(gdb) p chan->spies
$1 = (struct ast_channel_spy_list *) 0x820e400

(gdb) p *chan->spies
$2 = {read_translator = {last_format = 4, path = 0x820df60}, write_translator = {last_format = 4, path = 0x8191090}, list = {first = 0xb77b78b0,
    last = 0xb78818b0}}

(gdb) p chan->spies->list
$3 = {first = 0xb77b78b0, last = 0xb78818b0}

(gdb) p &chan->spies->list
$4 = (struct {...} *) 0x820e410

(gdb) p *(&chan->spies->list)->first
$7 = {list = {next = 0x0}, lock = {__m_reserved = 0, __m_count = 0, __m_owner = 0x0, __m_kind = 1, __m_lock = {__status = 0, __spinlock = 0}}, trigger = {
    __c_lock = {__status = 0, __spinlock = 0}, __c_waiting = 0x0, __padding = '\0' <repeats 27 times>, __align = 0}, read_queue = {head = 0x820df80,
    samples = 160, format = 64}, write_queue = {head = 0x0, samples = 0, format = 64}, flags = 57, status = CHANSPY_RUNNING, type = 0xb791ff5e "ChanSpy",
  read_vol_adjustment = 0, write_vol_adjustment = 0}

(gdb) p *(&chan->spies->list)->last
$8 = {list = {next = 0xb78818b0}, lock = {__m_reserved = 0, __m_count = 0, __m_owner = 0x0, __m_kind = 1, __m_lock = {__status = 0, __spinlock = 0}},
  trigger = {__c_lock = {__status = 0, __spinlock = 0}, __c_waiting = 0x0, __padding = '\0' <repeats 27 times>, __align = 0}, read_queue = {head = 0x0,
    samples = 0, format = 64}, write_queue = {head = 0x0, samples = 0, format = 64}, flags = 57, status = CHANSPY_RUNNING, type = 0xb791ff5e "ChanSpy",
  read_vol_adjustment = 0, write_vol_adjustment = 0}