bug: pthread TLS/TSS key destructors are not always invoked

[Bruno Haible]

Hi,

This test program, that works fine on all other Unix platforms (including
glibc/Linux), fails on glibc/Hurd.

I'm using the Debian Hurd distribution from 2020-07-31, downloaded from
https://cdimage.debian.org/cdimage/ports/latest/hurd-i386/20200731/debian-sid-hurd-i386-DVD-1.iso

Libc is 'Debian GLIBC 2.31-2'.

How to reproduce:
$ gcc-10 -Wall test-pthread-tss.c -ggdb -lpthread
$ ./a.out

It prints:
Starting test_tss ... OK
Starting test_tss_dtorcheck1 ...
and then runs into the abort() in line 382.
At this point, sum=4995 and expected_sum=5050. This means that for some
of the pthread keys, the destructor was not invoked.

It's also reproducible in a Hurd distro from 2019.

Bruno

test-pthread-tss.c
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