tree d013e40d570be9440648c638cc9655f1e25a1162
parent 604ed5785183e59ae2789449d89e73f3a2a77987
author Tipp Moseley <tipp@google.com> 1453923215 -0800
committer Brad Fitzpatrick <bradfitz@golang.org> 1453923215 -0800

Fixes a concurrency error in groupcache. Previously, multiple Get

requests could simultaneously result in a load().  Only requests that
enter singleflight Do concurrently would be deduped, so it was possible for
populateCache to be called multiple times for the same key.  That
would result in overcounting nbytes, and eventually leading to a
livelock where nbytes > cacheBytes, but there were no entries in the
cache.

Change-Id: I5b304ce82041c1310c31b662486744e86509cc53