On Mon, Nov 08, 2021 at 10:53:00PM +0100, Uwe Kleine-König wrote:
A strange thing is that a run with -V works (unless it does not because the tunnel breaks), while with -D it reproducible fails :-\

A typical ending then is:

my guess is that the server just disconnects, because things took too long, though it seems slightly weird that enabling debugging would make a difference.

we already know that the process actually consumes lots of cpu time.
make a debug build of mbsync, and do some profiling ... though i'm not sure how to do that best - the go-to recommentation would be "use valgrind --tool=callgrind", but that would take *ages*, which might distort the result (though it might not matter). "perf" (which is kernel-based, afaik) might work better, but i never played with it.


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