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authorRichard van der Hoff <richard@matrix.org>2017-09-20 01:32:42 +0100
committerRichard van der Hoff <richard@matrix.org>2017-09-20 01:32:42 +0100
commitabdefb8a01bf67b3055e9fbe52bb11a02ffd8d9a (patch)
tree5da0013e4c6d425cbf45980f76c13540ca9d89f2 /.github
parentAdd some comments to _start_key_lookups (diff)
downloadsynapse-abdefb8a01bf67b3055e9fbe52bb11a02ffd8d9a.tar.xz
Fix potential race in _start_key_lookups
If the verify_request.deferred has already completed, then `remove_deferreds`
will be called immediately. It therefore might resolve the server_to_deferred
deferred while there are still other requests for that server in flight.

To avoid that, we should build the complete list of requests, and *then* add the
callbacks.
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