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It actually happened in today's trunk build...
Created attachment 13898 [details] The deadlock
Created attachment 13899 [details] Almost identical deadlock
I was getting it pretty reliably until selected empty userdir.
caused by issue 40766 or Nejedly's attempt to fix it. The fix has been rolled back *** This issue has been marked as a duplicate of 40766 ***
Strange my sources are up-to-date. Anyway it really seems to be issue 40766 duplicate.
I've reverted my "fix" for 40776 a while ago, because it was causing the problem you've seen now.