On Wed, Aug 28, 2019 at 10:54:12AM -0400, Jeff King wrote: > > Unfortunately, however, while running './t5516-fetch-push.sh -r 1,79 > > --stress' to try to reproduce a failure caused by those mingled > > messages, the same check only failed for a different reason so far > > (both on Linux and macOS (on Travis CI)): > > There's some hand-waving argument that this should be race-free in > 014ade7484 (upload-pack: send ERR packet for non-tip objects, > 2019-04-13), but I am not too surprised if there is a flaw in that > logic. By the way, I've not been able to reproduce this locally after ~10 minutes of running "./t5516-fetch-push.sh -r 1,79 --stress" on my Linux box. I wonder what's different. Are you running the tip of master? -Peff