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Previously, it was technically possible for the FHR client to have multiple simultaneous uploads. While this should never occur in well-behaving systems, server logs have indicated that this behavior might be occurring. This patch adds a lock around uploading to ensure only 1 upload operation may be active at a given time. To measure the impact of this change in the wild, we added a counter that increments whenever a held lock is encountered. --HG-- extra : rebase_source : f0bb5065a3618cd335b6b6f31e4e68850f31f151