--- /dev/null
+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 1"""
+ date="2021-04-27T16:20:41Z"
+ content="""
+The command that you show failing does not seem to have concurrency
+enabled. Then you explicitly disable concurrency with -J 1 and it succeeds.
+Do you have annex.jobs set, and if so, to what?
+
+There is something very odd about "(checking s3...) (checking s3...)
+(checking s3...)" etc. I suspect you also have chunking enabled, and it is
+displaying that once per chunk, in which case it's probably not much of a
+clue about the problem. However, it highlights that you have really not
+explained how this remote is set up; it would be useful to provide enough
+information to reproduce the bug from scratch.
+"""]]