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<a href="https://gitlab.com/mlichvar">Miroslav Lichvar</a> created an issue <a href="https://gitlab.com/gnutls/gnutls/-/issues/1070">#1070</a>:
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<h2 dir="auto">
<a id="user-content-description-of-problem" class="anchor" href="#description-of-problem" aria-hidden="true"></a>Description of problem:</h2>
<p dir="auto">According to the documentation, calling <code>gnutls_global_deinit()</code> in an environment with <code>GNUTLS_NO_EXPLICIT_INIT=1</code> (or program compiled with <code>GNUTLS_SKIP_GLOBAL_INIT</code>) is supposed to free all memory used by gnutls. This doesn't seem to happen in my application, which is normally expected to make a few TLS sessions on start and then run for a long time without TLS. Maybe my program is buggy (see the reproducer), or there is a way to force gnutls to deallocate the memory, but I couldn't find it.</p>
<h2 dir="auto">
<a id="user-content-version-of-gnutls-used" class="anchor" href="#version-of-gnutls-used" aria-hidden="true"></a>Version of gnutls used:</h2>
<p dir="auto">gnutls-3.6.14</p>
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<a id="user-content-distributor-of-gnutls-eg-ubuntu-fedora-rhel" class="anchor" href="#distributor-of-gnutls-eg-ubuntu-fedora-rhel" aria-hidden="true"></a>Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)</h2>
<p dir="auto">Fedora 32</p>
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<a id="user-content-how-reproducible" class="anchor" href="#how-reproducible" aria-hidden="true"></a>How reproducible:</h2>
<p dir="auto">Always</p>
<p dir="auto">Steps to Reproduce:</p>
<ul dir="auto">
<li>compile and run the following program in valgrind:</li>
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<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">#include <gnutls/gnutls.h></span>
<span id="LC2" class="line" lang="plaintext">GNUTLS_SKIP_GLOBAL_INIT</span>
<span id="LC3" class="line" lang="plaintext"></span>
<span id="LC4" class="line" lang="plaintext">int main() {</span>
<span id="LC5" class="line" lang="plaintext"> gnutls_certificate_credentials_t credentials = NULL;</span>
<span id="LC6" class="line" lang="plaintext"></span>
<span id="LC7" class="line" lang="plaintext"> gnutls_global_init();</span>
<span id="LC8" class="line" lang="plaintext"> gnutls_certificate_allocate_credentials(&credentials);</span>
<span id="LC9" class="line" lang="plaintext"> gnutls_certificate_set_x509_system_trust(credentials);</span>
<span id="LC10" class="line" lang="plaintext"> gnutls_certificate_free_credentials(credentials);</span>
<span id="LC11" class="line" lang="plaintext"> gnutls_global_deinit();</span>
<span id="LC12" class="line" lang="plaintext"> return 0;</span>
<span id="LC13" class="line" lang="plaintext">}</span></code></pre>
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<a id="user-content-actual-results" class="anchor" href="#actual-results" aria-hidden="true"></a>Actual results:</h2>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">...</span>
<span id="LC2" class="line" lang="plaintext">==2640878== by 0x5CDE3F6: ??? (in /usr/lib64/pkcs11/p11-kit-trust.so)</span>
<span id="LC3" class="line" lang="plaintext">==2640878== by 0x5CD9CE4: ??? (in /usr/lib64/pkcs11/p11-kit-trust.so)</span>
<span id="LC4" class="line" lang="plaintext">==2640878== by 0x490DDD1: ??? (in /usr/lib64/libgnutls.so.30.28.0)</span>
<span id="LC5" class="line" lang="plaintext">==2640878== by 0x490FE3E: ??? (in /usr/lib64/libgnutls.so.30.28.0)</span>
<span id="LC6" class="line" lang="plaintext">==2640878== by 0x4910BFF: gnutls_pkcs11_obj_list_import_url4 (in /usr/lib64/libgnutls.so.30.28.0)</span>
<span id="LC7" class="line" lang="plaintext">==2640878== by 0x4910D59: gnutls_pkcs11_obj_list_import_url3 (in /usr/lib64/libgnutls.so.30.28.0)</span>
<span id="LC8" class="line" lang="plaintext">==2640878== by 0x49686C3: gnutls_x509_trust_list_add_trust_file (in /usr/lib64/libgnutls.so.30.28.0)</span>
<span id="LC9" class="line" lang="plaintext">==2640878== by 0x48D9E70: gnutls_x509_trust_list_add_system_trust (in /usr/lib64/libgnutls.so.30.28.0)</span>
<span id="LC10" class="line" lang="plaintext">==2640878== by 0x4010A5: main (in /home/miros/a.out)</span>
<span id="LC11" class="line" lang="plaintext">==2640878== </span>
<span id="LC12" class="line" lang="plaintext">==2640878== LEAK SUMMARY:</span>
<span id="LC13" class="line" lang="plaintext">==2640878== definitely lost: 0 bytes in 0 blocks</span>
<span id="LC14" class="line" lang="plaintext">==2640878== indirectly lost: 0 bytes in 0 blocks</span>
<span id="LC15" class="line" lang="plaintext">==2640878== possibly lost: 0 bytes in 0 blocks</span>
<span id="LC16" class="line" lang="plaintext">==2640878== still reachable: 5,408,309 bytes in 44,429 blocks</span>
<span id="LC17" class="line" lang="plaintext">==2640878== suppressed: 0 bytes in 0 blocks</span>
<span id="LC18" class="line" lang="plaintext">==2640878== </span>
<span id="LC19" class="line" lang="plaintext">==2640878== For lists of detected and suppressed errors, rerun with: -s</span>
<span id="LC20" class="line" lang="plaintext">==2640878== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)</span></code></pre>
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<a id="user-content-expected-results" class="anchor" href="#expected-results" aria-hidden="true"></a>Expected results:</h2>
<p dir="auto">All memory freed.</p>
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