From 660c8c1415704f0b9c6fe17fe74d40dfefd78f0a Mon Sep 17 00:00:00 2001
From: Sean Quah <8349537+squahtx@users.noreply.github.com>
Date: Tue, 5 Oct 2021 12:23:25 +0100
Subject: [PATCH] Log stack traces when a missing opentracing span is detected
 (#10983)

Make it easier to track down where opentracing spans are going missing
by including stack traces in the logs.
---
 changelog.d/10983.misc         | 1 +
 synapse/logging/opentracing.py | 1 +
 2 files changed, 2 insertions(+)
 create mode 100644 changelog.d/10983.misc

diff --git a/changelog.d/10983.misc b/changelog.d/10983.misc
new file mode 100644
index 000000000..235899d14
--- /dev/null
+++ b/changelog.d/10983.misc
@@ -0,0 +1 @@
+Log stack traces when a missing opentracing span is detected.
diff --git a/synapse/logging/opentracing.py b/synapse/logging/opentracing.py
index 03d2dd94f..5276c4bfc 100644
--- a/synapse/logging/opentracing.py
+++ b/synapse/logging/opentracing.py
@@ -339,6 +339,7 @@ def ensure_active_span(message, ret=None):
                     "There was no active span when trying to %s."
                     " Did you forget to start one or did a context slip?",
                     message,
+                    stack_info=True,
                 )
 
                 return ret