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<a href="https://gitlab.com/cybear" style="color: #1068bf;">Bjørn Christensen</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1380" style="color: #1068bf;">#1380</a>
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<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #eaeaea; border-bottom-style: solid; color: #303030; margin: 0 0 16px;" align="initial">
<a id="user-content-description-of-problem" class="anchor" href="#description-of-problem" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Description of problem:</h2>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">When our customer exits his application it generate an exception 0xc0000005 during the unload of the gnutls library.</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">The call stack indicates that it is failing in _gnutls_rnd_deinit. while trying to line 140 which looks simple</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">rnd_initialized = 0;</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">but it turns out that rnd_initialized is declared as</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">static _Thread_local unsigned rnd_initialized = 0;</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">where _Thread_local is defined as __declspec(thread)</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">and it turns out the Ubuntu 18.04 mingw 7.3 we are using does not support the __declspec(thread)</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">Is this a known problem?
Is it because I am using a too old version of mingw?
Which version of mingw are you using when cross compiling to windows?</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">Call stack at the exception:
_fpreset () C++</p>
<blockquote dir="auto" style="font-size: inherit; color: #525252; padding-top: 0.5rem; padding-bottom: 0.5rem; padding-left: 1.5rem; box-shadow: inset 4px 0 0 0 #dbdbdb; border-top-width: 0; border-bottom-width: 0; border-right-width: 0; margin: 0.5rem 0;" align="initial">
<p style="color: inherit; line-height: 1.5; margin: 0;">_gnutls_rnd_deinit() Line 140 C++
_gnutls_global_deinit() Line 415 C++
lib_deinit() Line 530 C++
__do_global_dtors() Line 27 C++
_CRT_INIT() Line 142 C++
__DllMainCRTStartup() Line 211 C++
LdrpCallInitRoutine() Unknown
LdrpProcessDetachNode() Unknown
LdrpUnloadNode() Unknown
LdrpDecrementModuleLoadCountEx () Unknown
LdrUnloadDll () Unknown
FreeLibrary() Unknown</p>
</blockquote>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">The fpreset seems to be a red herring when inspection the disassembly. (it is _fpreset+0x190, symbols must be incomplete )</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #eaeaea; border-bottom-style: solid; color: #303030; margin: 24px 0 16px;" align="initial">
<a id="user-content-version-of-gnutls-used" class="anchor" href="#version-of-gnutls-used" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Version of gnutls used:</h2>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">3.6.15</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #eaeaea; border-bottom-style: solid; color: #303030; margin: 24px 0 16px;" align="initial">
<a id="user-content-distributor-of-gnutls-eg-ubuntu-fedora-rhel" class="anchor" href="#distributor-of-gnutls-eg-ubuntu-fedora-rhel" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)</h2>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">Cross-compiled Compiled and linked by me on Ubuntu 18.04 with mingw version 7.4 for windows.</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #eaeaea; border-bottom-style: solid; color: #303030; margin: 24px 0 16px;" align="initial">
<a id="user-content-how-reproducible" class="anchor" href="#how-reproducible" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>How reproducible:</h2>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">Difficult but reproducable
Steps to Reproduce:</p>
<ul dir="auto" style="text-align: initial; list-style-type: disc; margin: 0 0 16px; padding: 0;">
<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">one</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">two</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">three</li>
</ul>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #eaeaea; border-bottom-style: solid; color: #303030; margin: 24px 0 16px;" align="initial">
<a id="user-content-actual-results" class="anchor" href="#actual-results" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Actual results:</h2>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">Exception during exit</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #eaeaea; border-bottom-style: solid; color: #303030; margin: 24px 0 16px;" align="initial">
<a id="user-content-expected-results" class="anchor" href="#expected-results" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Expected results:</h2>
<p dir="auto" style="color: #303030; margin: 0;" align="initial">no exception during exit</p>
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