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79d0e63b18
The feature added in 4.1 to lock the modinfo cache does not work when using Redis, because: * The API to acquire a cache lock is confusing, and the code did not check that it successfully acquired a lock before going on to build the cache anyway. * Unlike the other types of cache lock, the Redis store did not retry the lock for a timeout period before giving up and failing. This change fixes both points.