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-rw-r--r--synapse/federation/federation_base.py19
1 files changed, 19 insertions, 0 deletions
diff --git a/synapse/federation/federation_base.py b/synapse/federation/federation_base.py
index dfe6b4aa5c..1d641337da 100644
--- a/synapse/federation/federation_base.py
+++ b/synapse/federation/federation_base.py
@@ -269,7 +269,17 @@ def _check_sigs_on_pdus(keyring, room_version, pdus):
         for p in pdus_to_check_sender
     ])
 
+    def sender_err(e, pdu_to_check):
+        logger.warning(
+            "event id %s: unable to verify signature for sender %s: %s",
+            pdu_to_check.pdu.event_id,
+            pdu_to_check.sender_domain,
+            e,
+        )
+        return e
+
     for p, d in zip(pdus_to_check_sender, more_deferreds):
+        d.addErrback(sender_err, p)
         p.deferreds.append(d)
 
     # now let's look for events where the sender's domain is different to the
@@ -291,7 +301,16 @@ def _check_sigs_on_pdus(keyring, room_version, pdus):
             for p in pdus_to_check_event_id
         ])
 
+        def event_err(e, pdu_to_check):
+            logger.warning(
+                "event id %s: unable to verify signature for event id domain: %s",
+                pdu_to_check.pdu.event_id,
+                e,
+            )
+            return e
+
         for p, d in zip(pdus_to_check_event_id, more_deferreds):
+            d.addErrback(event_err, p)
             p.deferreds.append(d)
 
     # replace lists of deferreds with single Deferreds