glibc: pthread_atfork handlers that call pthread_atfork deadlock

Bug #2048866 reported by Ayala Wexelbom
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This bug affects 1 person
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glibc (Ubuntu)
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Bug Description

I encountered a bug in glibc fork handlers mechanism, this bug was originally detected, reproduced and fixed in the RedHat glibc library : https://bugzilla.redhat.com/show_bug.cgi?id=1888660

In this bug, running the same preproduction snippet code from Rhel 8 Glibc bug, reproduces the deadlock seen in the original bug.

Seen on Ubuntu 22.04 on GLIBC 2.35
Also seen on Ubuntu 20.04 GLIBC 2.31

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