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So, backtrace boils down to following:
sssd::util/server.c:orderly_shutdown() ->
libc::exit() -> libc::on_exit() -> ... ->
libtalloc::talloc_lib_atexit() -> [a bunch of libtalloc::_tc_free_*() leading to] ->
sssd::providers/ldap/sdap_async.c:sdap_handle_destructor() [d-tor of "sdap_handle"] -> (inlined)sdap_handle_release() ->
(inlined)libldap::ldap_unbind_ext() ->ldap_ld_free() -> ...
libcrypto::RAND_get_rand_method()(*) -> CRYPTO_THREAD_write_lock()
RAND_get_rand_method() calls CRYPTO_THREAD_write_lock(rand_meth_lock)
with "rand_meth_lock" being "static CRYPTO_RWLOCK *rand_meth_lock;"
[ https://github.com/openssl/openssl/blob/master/crypto/rand/rand_lib.c ]
Take a note, this is libc::on_exit() path.
Now, https://github.com/openssl/openssl/blob/master/crypto/init.c#L140 :
atexit(OPENSSL_cleanup)
OPENSSL_cleanup() -> rand_cleanup_int() -> CRYPTO_THREAD_lock_free(rand_meth_lock);
[ https://github.com/openssl/openssl/blob/master/crypto/rand/rand_lib.c#L357 ]
So, I am not sure on order of execution of "on_exit" handlers, but it seems it might be so that OpenSSL handler is executed first and mutex is already freed when sssd's "on_exit" handlers tries to lock it...
Thank you very much for the analysis, Alexey.
Given that this is "just" a crash on exit, I don't think it is worth a blocker flag for 8.0 and can wait for either 8.0.z if we will do a z-stream update for another reason or even 8.1
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2020:1863