This causes a different problem.  We actually hit the problem in this test:

https://gitlab.com/nbdkit/libnbd/-/blob/master/tests/dlopen.c

(1) The thread calls dlclose(), unmapping the library but leaving the
pthread_key_t in place, which contains a pointer to free_errors_key in
the unmapped library.

(2) The thread exits, and glibc calls free_errors_key, causing a crash.

Maybe -z nodelete really is the only answer.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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