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-rw-r--r--src/or/scheduler_kist.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/or/scheduler_kist.c b/src/or/scheduler_kist.c
index a3b74e8cc9..d1726ba345 100644
--- a/src/or/scheduler_kist.c
+++ b/src/or/scheduler_kist.c
@@ -598,6 +598,15 @@ kist_scheduler_run(void)
if (socket_can_write(&socket_table, chan)) {
/* flush to channel queue/outbuf */
flush_result = (int)channel_flush_some_cells(chan, 1); // 1 for num cells
+ /* XXX: While flushing cells, it is possible that the connection write
+ * fails leading to the channel to be closed which triggers a release
+ * and free its entry in the socket table. And because of a engineering
+ * design issue, the error is not propagated back so we don't get an
+ * error at this poin. So before we continue, make sure the channel is
+ * open and if not just ignore it. See #23751. */
+ if (!CHANNEL_IS_OPEN(chan)) {
+ continue;
+ }
/* flush_result has the # cells flushed */
if (flush_result > 0) {
update_socket_written(&socket_table, chan, flush_result *