Fix deadlock in PJSIP channel creation with endpoint variables

debian/changelog

@@ -1,3 +1,9 @@
+asterisk (8:22.8.1-1~wazo2) wazo-dev-bookworm; urgency=medium
+
+  * Fix deadlock in chan_pjsip_new when PJSIP_HEADER used as endpoint channel var
+
+ -- Wazo Maintainers <dev+pkg@wazo.community>  Thu, 05 Mar 2026 10:00:00 -0500
+
 asterisk (8:22.8.1-1~wazo1) wazo-dev-bookworm; urgency=medium
 
   * asterisk 22.8.1

debian/patches/fix-pjsip-channel-creation-deadlock

@@ -0,0 +1,27 @@
+# Set endpoint channel variables after unlock to prevent deadlock
+# when variables invoke dialplan functions (e.g., PJSIP_HEADER)
+# that block on serializer tasks while the channel lock is held.
+# pbx_builtin_setvar_helper will acquire and release channel lock on each invocation in the loop
+Index: asterisk-22.8.1/channels/chan_pjsip.c
+===================================================================
+--- asterisk-22.8.1.orig/channels/chan_pjsip.c	2026-03-05 15:42:57.508015668 +0000
++++ asterisk-22.8.1/channels/chan_pjsip.c	2026-03-05 15:43:19.673013563 +0000
+@@ -665,15 +665,15 @@
+ 		ast_channel_zone_set(chan, zone);
+ 	}
+
++	ast_channel_stage_snapshot_done(chan);
++	ast_channel_unlock(chan);
++
+ 	for (var = session->endpoint->channel_vars; var; var = var->next) {
+ 		char buf[512];
+ 		pbx_builtin_setvar_helper(chan, var->name, ast_get_encoded_str(
+ 					var->value, buf, sizeof(buf)));
+ 	}
+
+-	ast_channel_stage_snapshot_done(chan);
+-	ast_channel_unlock(chan);
+-
+ 	set_channel_on_rtp_instance(session, ast_channel_uniqueid(chan));
+
+ 	SCOPE_EXIT_RTN_VALUE(chan);

debian/patches/series

@@ -29,3 +29,4 @@ mix_monitor_announce_file
 fix-application-playback-update
 expose-app-queues-mutex
 fix-queue-deadlock
+fix-pjsip-channel-creation-deadlock