==== Error ====
* mwversion: `undefined`
* reqId: `undefined`
* [[ https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:'2021-06-09T16:59:27.384Z',to:'2021-06-10T16:59:27.384Z'))&_a=(query:(query_string:(query:'reqId:%22undefined%22'))) | Find reqId in Logstash ]]
* [[ https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:now-30d,to:now))&_a=(query:(query_string:(query:'normalized_message:%22Error:%20write%20cursor%20too%20small%22'))) | Find normalized_message in Logstash ]]
```name=normalized_message
Error: write cursor too small
```
```
name=exception.trace,lines=10
```
==== Impact ====
No user-facing impact observed thus far
==== Notes ====
78 occurrences starting yesterday shortly after the train rolled out to Commons, which swapped the extension serving up Special:MediaSearch. We should investigate if the MediaSearch extension code introduced this. Seems to be a problem only on the video tab on mobile.