idle_timeout_crazy_rtt hangs more often now

[larseggert]

Something recently changed that makes the idle_timeout_crazy_rtt test not terminate pretty frequently, e.g., https://github.com/mozilla/neqo/actions/runs/11161582095/job/31024435251#step:7:1334

[martinthomson]

Your changes to reduce send rate when packets are lost will probably extend the time needed.

[larseggert]

But not by hours of real time?

[martinthomson]

No, not that. I'm not seeing what conditions resulted in the stall though; the output of the run seems to have been lost. If we have a seed for the test, it could be replicated locally.

[larseggert]

This one, for example: https://github.com/mozilla/neqo/actions/runs/11236671253/job/31237337009

[larseggert]

#2165 may help, once it's live in CI.