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chan_sip.c: Adjust how dialog_unlink_all() stops scheduled events.

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This patch is part of a series to resolve deadlocks in chan_sip.c.

* Make dialog_unlink_all() unschedule all items at once in the sched
thread.

ASTERISK-25023

Change-Id: I7743072fb228836e8228b72f6dc46c8cc50b3fb4
This commit is contained in:
Richard Mudgett
2016-03-09 11:22:50 -06:00
parent 5f3225ddcc
commit f959d84dfd
1 changed files with 62 additions and 36 deletions
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98
channels/chan_sip.c
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@@ -3240,6 +3240,60 @@ static void ref_proxy(struct sip_pvt *pvt, struct sip_proxy *proxy)
}
}
static void do_dialog_unlink_sched_items(struct sip_pvt *dialog)
{
struct sip_pkt *cp;
/* remove all current packets in this dialog */
sip_pvt_lock(dialog);
while ((cp = dialog->packets)) {
/* Unlink the node from the list. */
dialog->packets = dialog->packets->next;
/* Destroy the packet object. */
AST_SCHED_DEL(sched, cp->retransid);
dialog_unref(cp->owner, "Unlink dialog removing all retransmitable packets");
ast_free(cp->data);
ast_free(cp);
}
sip_pvt_unlock(dialog);
AST_SCHED_DEL_UNREF(sched, dialog->waitid,
dialog_unref(dialog, "Stop scheduled waitid"));
AST_SCHED_DEL_UNREF(sched, dialog->initid,
dialog_unref(dialog, "Stop scheduled initid"));
AST_SCHED_DEL_UNREF(sched, dialog->reinviteid,
dialog_unref(dialog, "Stop scheduled reinviteid"));
AST_SCHED_DEL_UNREF(sched, dialog->autokillid,
dialog_unref(dialog, "Stop scheduled autokillid"));
AST_SCHED_DEL_UNREF(sched, dialog->request_queue_sched_id,
dialog_unref(dialog, "Stop scheduled request_queue_sched_id"));
AST_SCHED_DEL_UNREF(sched, dialog->provisional_keepalive_sched_id,
dialog_unref(dialog, "Stop scheduled provisional keepalive"));
AST_SCHED_DEL_UNREF(sched, dialog->t38id,
dialog_unref(dialog, "Stop scheduled t38id"));
if (dialog->stimer) {
stop_session_timer(dialog);
}
}
/* Run by the sched thread. */
static int __dialog_unlink_sched_items(const void *data)
{
struct sip_pvt *dialog = (void *) data;
do_dialog_unlink_sched_items(dialog);
dialog_unref(dialog, "Stop scheduled items for unlink action");
return 0;
}
/*!
* \brief Unlink a dialog from the dialogs container, as well as any other places
* that it may be currently stored.
@@ -3249,7 +3303,6 @@ static void ref_proxy(struct sip_pvt *pvt, struct sip_proxy *proxy)
*/
void dialog_unlink_all(struct sip_pvt *dialog)
{
struct sip_pkt *cp;
struct ast_channel *owner;
dialog_ref(dialog, "Let's bump the count in the unlink so it doesn't accidentally become dead before we are done");
@@ -3287,41 +3340,14 @@ void dialog_unlink_all(struct sip_pvt *dialog)
dialog->relatedpeer->call = dialog_unref(dialog->relatedpeer->call, "unset the relatedpeer->call field in tandem with relatedpeer field itself");
}
/* remove all current packets in this dialog */
while((cp = dialog->packets)) {
dialog->packets = dialog->packets->next;
AST_SCHED_DEL(sched, cp->retransid);
dialog_unref(cp->owner, "remove all current packets in this dialog, and the pointer to the dialog too as part of __sip_destroy");
if (cp->data) {
ast_free(cp->data);
}
ast_free(cp);
}
AST_SCHED_DEL_UNREF(sched, dialog->waitid, dialog_unref(dialog, "when you delete the waitid sched, you should dec the refcount for the stored dialog ptr"));
AST_SCHED_DEL_UNREF(sched, dialog->initid, dialog_unref(dialog, "when you delete the initid sched, you should dec the refcount for the stored dialog ptr"));
if (dialog->reinviteid > -1) {
AST_SCHED_DEL_UNREF(sched, dialog->reinviteid, dialog_unref(dialog, "clear ref for reinvite_timeout"));
}
if (dialog->autokillid > -1) {
AST_SCHED_DEL_UNREF(sched, dialog->autokillid, dialog_unref(dialog, "when you delete the autokillid sched, you should dec the refcount for the stored dialog ptr"));
}
if (dialog->request_queue_sched_id > -1) {
AST_SCHED_DEL_UNREF(sched, dialog->request_queue_sched_id, dialog_unref(dialog, "when you delete the request_queue_sched_id sched, you should dec the refcount for the stored dialog ptr"));
}
AST_SCHED_DEL_UNREF(sched, dialog->provisional_keepalive_sched_id, dialog_unref(dialog, "when you delete the provisional_keepalive_sched_id, you should dec the refcount for the stored dialog ptr"));
if (dialog->t38id > -1) {
AST_SCHED_DEL_UNREF(sched, dialog->t38id, dialog_unref(dialog, "when you delete the t38id sched, you should dec the refcount for the stored dialog ptr"));
}
if (dialog->stimer) {
stop_session_timer(dialog);
dialog_ref(dialog, "Stop scheduled items for unlink action");
if (ast_sched_add(sched, 0, __dialog_unlink_sched_items, dialog) < 0) {
/*
* Uh Oh. Fall back to unscheduling things immediately
* despite the potential deadlock risk.
*/
dialog_unref(dialog, "Failed to schedule stop scheduled items for unlink action");
do_dialog_unlink_sched_items(dialog);
}
dialog_unref(dialog, "Let's unbump the count in the unlink so the poor pvt can disappear if it is time");