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<p style="color: #777777;">
<a href="https://gitlab.com/cybear" style="color: #1068bf;">Bjørn Christensen</a>
commented on a
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1380#note_1004078015" style="color: #1068bf;">discussion</a>:
</p>
<div class="md" style="color: #303030; word-wrap: break-word;">
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">Good point Daiki,</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">And if I change the __declspec(thread) to __thread my sample program works.</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">When I examined the crash I looked at the disassembly and I could not see that the access to rnd_initialized was guarded.</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" data-canonical-lang="" v-pre="true" style='display: block; font-size: 13px; color: #303030; line-height: 1.6em; overflow-x: auto; border-radius: 2px; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; margin: 0 0 16px; padding: 12px; border: 1px solid #dbdbdb;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;"> 00000000773B165A mov qword ptr [rbp-8],0 </span>
<span id="LC2" class="line" lang="plaintext"></span>
<span id="LC3" class="line" lang="plaintext"> 00000000773B1662 mov rax,qword ptr [rbp-10h] </span>
<span id="LC4" class="line" lang="plaintext"></span>
<span id="LC5" class="line" lang="plaintext"> 00000000773B1666 mov qword ptr [rbp-8],rax </span></code></pre>
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<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">L3: 00000000773B166A cmp qword ptr [rbp-8],0 // 131</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" data-canonical-lang="" v-pre="true" style='display: block; font-size: 13px; color: #303030; line-height: 1.6em; overflow-x: auto; border-radius: 2px; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; margin: 0 0 16px; padding: 12px; border: 1px solid #dbdbdb;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;"> 00000000773B166F jne _gnutls_rnd_deinit+25h (0773B1624h) L2 // 131</span>
<span id="LC2" class="line" lang="plaintext"></span>
<span id="LC3" class="line" lang="plaintext"> 00000000773B1671 mov qword ptr [head (077618568h)],0 </span></code></pre>
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<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">L1: 00000000773B167C lea rcx,[gnutls_mutex_unlock+8h (077551380h)]</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" data-canonical-lang="" v-pre="true" style='display: block; font-size: 13px; color: #303030; line-height: 1.6em; overflow-x: auto; border-radius: 2px; position: relative; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; word-break: break-all; word-wrap: break-word; background-color: #fafafa; margin: 0 0 16px; padding: 12px; border: 1px solid #dbdbdb;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;"> 00000000773B1683 call _fpreset+190h (07754A420h) </span>
<span id="LC2" class="line" lang="plaintext"></span>
<span id="LC3" class="line" lang="plaintext"> 00000000773B1688 mov dword ptr [rax],0 </span>
<span id="LC4" class="line" lang="plaintext"></span>
<span id="LC5" class="line" lang="plaintext"> 00000000773B168E call _rnd_system_entropy_deinit (07748BCB2h) </span>
<span id="LC6" class="line" lang="plaintext"></span>
<span id="LC7" class="line" lang="plaintext"> 00000000773B1693 nop </span>
<span id="LC8" class="line" lang="plaintext"></span>
<span id="LC9" class="line" lang="plaintext"> 00000000773B1694 add rsp,30h </span>
<span id="LC10" class="line" lang="plaintext"></span>
<span id="LC11" class="line" lang="plaintext"> 00000000773B1698 pop rbp </span></code></pre>
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<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">Maybe the call to _fpreset+0x190 is the setup of TLS memory.</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">Thanks for the help I will investigate a bit further.</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">/bhc</p>
<details style="margin-bottom: 0;"><summary style="margin-top: 0;">...</summary>
<p style="color: #303030; margin: 0 0 16px 1rem;">From: <a href="mailto:gitlab@mg.gitlab.com" style="color: #1068bf; margin-top: 0;">gitlab@mg.gitlab.com</a> <a href="mailto:gitlab@mg.gitlab.com" style="color: #1068bf;">gitlab@mg.gitlab.com</a>
Sent: Friday, 24 June 2022 10.29
To: <a href="mailto:bhc@insight.dk" style="color: #1068bf;">bhc@insight.dk</a>
Subject: Re: GnuTLS | Crash (0xC0000005) when closing application. (<a href="https://gitlab.com/gnutls/gnutls/-/issues/1380" data-original="#1380" data-link="false" data-link-reference="false" data-project="179611" data-issue="110609792" data-project-path="gnutls/gnutls" data-iid="1380" data-issue-type="issue" data-reference-type="issue" data-container="body" data-placement="top" title="Crash (0xC0000005) when closing application." class="gfm gfm-issue" style="color: #1068bf;">#1380</a>)</p>
<p style="color: #303030; margin: 0 0 16px 1rem;">Daiki Ueno <a href="https://gitlab.com/dueno" style="color: #1068bf; margin-top: 0;">https://gitlab.com/dueno</a> commented on a discussion <a href="https://gitlab.com/gnutls/gnutls/-/issues/1380#note_1004040111" data-original="https://gitlab.com/gnutls/gnutls/-/issues/1380#note_1004040111" data-link="false" data-link-reference="true" data-project="179611" data-issue="110609792" data-project-path="gnutls/gnutls" data-iid="1380" data-issue-type="issue" data-reference-type="issue" data-container="body" data-placement="top" title="Crash (0xC0000005) when closing application." class="gfm gfm-issue" style="color: #1068bf;">#1380 (comment 1004040111)</a> :</p>
<p style="color: #303030; margin: 0 0 16px 1rem;">GnuTLS usage of __declspec(thread) is guarded <a href="https://gitlab.com/gnutls/gnutls/-/blob/master/lib/gthreads.h" style="color: #1068bf; margin-top: 0;">https://gitlab.com/gnutls/gnutls/-/blob/master/lib/gthreads.h</a> with #ifdef _MSC_VER. If you see the macro expanded, that means_MSC_VER is defined somewhere, while it shouldn't be if you are using g++: <a href="https://sourceforge.net/p/mingw-w64/bugs/282/#3996" rel="nofollow noreferrer noopener" target="_blank" style="color: #1068bf;">https://sourceforge.net/p/mingw-w64/bugs/282/#3996</a></p>
<p style="color: #303030; margin: 0 0 16px 1rem;">—
Reply to this email directly or view it on GitLab <a href="https://gitlab.com/gnutls/gnutls/-/issues/1380#note_1004040111" data-original="https://gitlab.com/gnutls/gnutls/-/issues/1380#note_1004040111" data-link="false" data-link-reference="true" data-project="179611" data-issue="110609792" data-project-path="gnutls/gnutls" data-iid="1380" data-issue-type="issue" data-reference-type="issue" data-container="body" data-placement="top" title="Crash (0xC0000005) when closing application." class="gfm gfm-issue" style="color: #1068bf; margin-top: 0;">#1380 (comment 1004040111)</a> .
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