On Sun, 20 Jun 2021, Zebediah Figura (she/her) wrote: [...]
My guess is it's bug 51277. I have a fix attached here.
I had trouble reproducing the failure since it's random and really only happens in the TestBot VMs (and there was a bug in the script to reproduce it too).
But now it's all sorted out the patch does seem to fix the issue: * Without the patch I could reproduce the hang after 5, 14 and 10 runs. * With the patch I got 75 successful runs in a row. * And after reverting the patch I again had hangs after 3, 1 and 10 runs.