Looking at the data we see that the fix for replacing the revalidated flow is being hit: upcall_ukey_replace 0.0/sec 0.000/sec 0.0086/sec total: 601 We also see that we hit a "real" duplicate upcall: handler_duplicate_upcall 0.0/sec 0.000/sec 0.0000/sec total: 1 This is where the log message gets logged for. However, from the logging/debugging available in the code it's not possible to determine the actual cause. If we would have a reproducer a debug build can be made to narrow down the cause.
Will close BZ for now, until we get debug info, however, this does not look like a real issue.
The needinfo request[s] on this closed bug have been removed as they have been unresolved for 120 days