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Date: Sun, 23 Mar 2025 20:32:44 +0800
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To: cygwin AT cygwin DOT com
Subject: Deadlock when calling pthread_key_create in the destructor of a
 pthread_key
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From: Yuyi Wang via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Yuyi Wang <Strawberry_Str AT hotmail DOT com>
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Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

It's a bug when I tried to run tests of Rust std lib. The standard
library of Rust tries to create a new pthread_key in the destructor of a
key created previously. Unfortunately, List::for_each locked the mutex
before, so List_insert method cannot lock the mutex again.

I have searched though the POSIX docs and didn't find any words that one
should not call pthread_key_create in the destructor of a pthread_key. I
think it should be a bug of cygwin.

Thanks,
Yuyi Wang

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