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The rate-limiter inside imudp was not set to be thread safe, but was used across multiple threads. This worked in default configuration, but failed when RepeatedMsgReduction was set to "on". Note that it in general is a bug to use a rate-limiter in non-threadsafe mode across multiple threads. This also causes invalid rate limiting counts in the default case. closes https://github.com/rsyslog/rsyslog/issues/441 fixes https://github.com/rsyslog/rsyslog/issues/2132