[Issue 20270] [REG2.087] Deadlock in garbage collection when running processes in parallel

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20270

--- Comment #2 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
(In reply to igor.khasilev from comment #1)
> May (or may not) be related https://issues.dlang.org/show_bug.cgi?id=20256
> if scanthread do not block SIGUSR1 and SIGUSR2

Unfortunately `digger run stable+druntime#2813 -- dmd -run test` still hangs.

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