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Issue created by <a href="https://gitlab.rtems.org/mustafa.gedikoglu">Mustafa Enes Gedikoglu</a>: <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5776">#5776</a>
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<h2 id="user-content-summary" dir="auto" style="margin-top: 0px; margin-bottom: 10px;" align="initial">Summary<a href="#summary" aria-label="Link to heading 'Summary'" data-heading-content="Summary" class="anchor" style="margin-top: 0px;"></a>
</h2>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">In <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">pthread_mutex_init()</code> the object flags, which carry the magic value checked by <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">POSIX_MUTEX_VALIDATE_OBJECT()</code>, are stored before the priority ceiling of a <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">PTHREAD_PRIO_PROTECT</code> mutex is validated. If the ceiling is rejected the function return <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">EINVAL</code>, but the object already passes validation while its thread queue, priority ceiling node and scheduler are still uninitialized. All other <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">EINVAL</code> paths return before the object is touched.</p>
<h2 id="user-content-steps-to-reproduce" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Steps to reproduce<a href="#steps-to-reproduce" aria-label="Link to heading 'Steps to reproduce'" data-heading-content="Steps to reproduce" class="anchor" style="margin-top: 0px;"></a>
</h2>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre data-canonical-lang="c" class="code highlight js-syntax-highlight language-c" v-pre="true" style="display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0px 0 1rem; padding: 12px; border: 1px solid #dcdcde;"><code style="font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;"><span id="LC1" class="line" data-lang="c" style="margin-top: 0px;"><span class="n" style="margin-top: 0px;">pthrad_mutexattr_t</span> <span class="n">attr</span><span class="p">;</span></span>
<span id="LC2" class="line" data-lang="c"><span class="n" style="margin-top: 0px;">pthread_mutex_t</span> <span class="n">mtx</span><span class="p">;</span></span>
<span id="LC3" class="line" data-lang="c"></span>
<span id="LC4" class="line" data-lang="c"><span class="n" style="margin-top: 0px;">memset</span><span class="p">(</span> <span class="o">&</span><span class="n">mtx</span><span class="p">,</span> <span class="mh">0xa5</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span> <span class="n">mtx</span> <span class="p">)</span> <span class="p">);</span></span>
<span id="LC5" class="line" data-lang="c"><span class="n" style="margin-top: 0px;">pthread_mutexattr_init</span><span class="p">(</span> <span class="o">&</span><span class="n">attr</span> <span class="p">);</span></span>
<span id="LC6" class="line" data-lang="c"><span class="n" style="margin-top: 0px;">pthread_mutexattr_setprotocol</span><span class="p">(</span> <span class="o">&</span><span class="n">attr</span><span class="p">,</span> <span class="n">PTHREAD_PRIO_PROTECT</span> <span class="p">);</span></span>
<span id="LC7" class="line" data-lang="c"><span class="n" style="margin-top: 0px;">pthread_mutexattr_setprioceiling</span><span class="p">(</span> <span class="o">&</span><span class="n">attr</span><span class="p">,</span> <span class="n">sched_get_prioirty_max</span><span class="p">(</span> <span class="n">SCHED_FIFO</span> <span class="p">)</span> <span class="o">+</span> <span class="mi">1</span> <span class="p">);</span></span>
<span id="LC8" class="line" data-lang="c"></span>
<span id="LC9" class="line" data-lang="c"><span class="n" style="margin-top: 0px;">pthread_mutex_init</span><span class="p">(</span> <span class="o">&</span><span class="n">mtx</span><span class="p">,</span> <span class="o">&</span><span class="n">attr</span> <span class="p">);</span> <span class="cm">/* EINVAL */</span></span>
<span id="LC10" class="line" data-lang="c"><span class="n" style="margin-top: 0px;">pthread_mutex_trylock</span><span class="p">(</span> <span class="o">&</span><span class="n">mtx</span> <span class="p">);</span> <span class="cm">/* expected EINVAL, returns EBUSY */</span></span>
<span id="LC11" class="line" data-lang="c"><span class="n" style="margin-top: 0px;">pthread_mutex_destroy</span><span class="p">(</span> <span class="o">&</span><span class="n">mtx</span> <span class="p">);</span> <span class="cm">/* expected EINVAL, returns EBUSY */</span></span></code></pre>
<copy-code></copy-code><insert-code-snippet></insert-code-snippet>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">Run on aarch64/zynqmp_apu (QEMU), uniprocessor, RTEMS_DEBUG disabled, GCC 16.1.1, Newlib 4.6.0</p>
<h2 id="user-content-expected-behavior" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Expected Behavior<a href="#expected-behavior" aria-label="Link to heading 'Expected Behavior'" data-heading-content="Expected Behavior" class="anchor" style="margin-top: 0px;"></a>
</h2>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial"><code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">pthread_mutex_init()</code> returns <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">EINVAL</code> and leaves <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">*mutex</code> unmodified. Later calls reject the object with <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">EINVAL</code></p>
<h2 id="user-content-actual-behavior" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Actual Behavior<a href="#actual-behavior" aria-label="Link to heading 'Actual Behavior'" data-heading-content="Actual Behavior" class="anchor" style="margin-top: 0px;"></a>
</h2>
<p dir="auto" style="color: #3a383f; margin: 0px;" align="initial"><code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">*mutex</code> is modified and accepted by later calls. With the fill pattern above the owner field of the uninitialized thread queue hold <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">0xa5a5..</code>, so later calls treat the mutex as locked by another thread: trylock and destroy return <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">EBUSY</code>, and <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">pthread_mutex_lock()</code> causes a fatal error, a data abort in <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">_Thread_queue_Path_acquire()</code>. With a zero-filled object the lock succeeds and raises the caller to priority 0.</p>
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