<h1 dir="auto">Checklist</h1>
<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have verified that the issue exists against the <code class="notranslate">main</code> branch of Celery.</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> This has already been asked to the <a href="https://github.com/celery/celery/discussions">discussions forum</a> first.</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have read the relevant section in the<br>
<a href="https://docs.celeryq.dev/en/main/contributing.html#other-bugs" rel="nofollow">contribution guide</a><br>
on reporting bugs.</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have checked the <a href="https://github.com/celery/celery/issues?q=is%3Aissue+label%3A%22Issue+Type%3A+Bug+Report%22+-label%3A%22Category%3A+Documentation%22">issues list</a><br>
for similar or identical bug reports.</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have checked the <a href="https://github.com/celery/celery/pulls?q=is%3Apr+label%3A%22PR+Type%3A+Bugfix%22+-label%3A%22Category%3A+Documentation%22">pull requests list</a><br>
for existing proposed fixes.</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have checked the <a href="https://github.com/celery/celery/commits/main">commit log</a><br>
to find out if the bug was already fixed in the main branch.</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have included all related issues and possible duplicate issues<br>
in this issue (If there are none, check this box anyway).</li>
</ul>
<h2 dir="auto">Mandatory Debugging Information</h2>
<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have included the output of <code class="notranslate">celery -A proj report</code> in the issue.<br>
(if you are not able to do this, then at least specify the Celery<br>
version affected).</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have verified that the issue exists against the <code class="notranslate">main</code> branch of Celery.</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have included the contents of <code class="notranslate">pip freeze</code> in the issue.</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have included all the versions of all the external dependencies required<br>
to reproduce this bug.</li>
</ul>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="celery -A uniweb report

software -&gt; celery:5.2.7 (dawn-chorus) kombu:5.3.0 py:3.9.17
            billiard:3.6.4.0 redis:4.5.4
platform -&gt; system:Linux arch:64bit
            kernel version:3.10.0-1160.88.1.el7.x86_64 imp:CPython
loader   -&gt; celery.loaders.app.AppLoader
settings -&gt; transport:sentinel results:redis://:**@django-cms-test-redis-headless:6379/7"><pre class="notranslate"><code class="notranslate">celery -A uniweb report

software -&gt; celery:5.2.7 (dawn-chorus) kombu:5.3.0 py:3.9.17
            billiard:3.6.4.0 redis:4.5.4
platform -&gt; system:Linux arch:64bit
            kernel version:3.10.0-1160.88.1.el7.x86_64 imp:CPython
loader   -&gt; celery.loaders.app.AppLoader
settings -&gt; transport:sentinel results:redis://:**@django-cms-test-redis-headless:6379/7
</code></pre></div>
<p dir="auto">Our setup is Celery with Redis over Sentinel in a Kubernetes cluster. After upgrading Redis from version <a href="https://github.com/redis/redis-py/releases/tag/v4.5.4">4.5.4</a> to 4.5.5 the Celery worker crashed without any message. Return code after crashing is 0.</p>
<p dir="auto">The same image running on Docker-Swarm without Sentinel works flawlessly.</p>
<p dir="auto">pip freeze gives (I removed irrelevant packages):</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="billiard==3.6.4.0
…
django-redis==5.2.0
…
hiredis==2.2.3
…
kombu==5.3.0
…
redis==4.5.5  # &lt;= the culprit, by downgrading to 4.5.4, Celery works fine
requests==2.31.0
…
urllib3==1.26.16
…"><pre class="notranslate"><code class="notranslate">billiard==3.6.4.0
…
django-redis==5.2.0
…
hiredis==2.2.3
…
kombu==5.3.0
…
redis==4.5.5  # &lt;= the culprit, by downgrading to 4.5.4, Celery works fine
requests==2.31.0
…
urllib3==1.26.16
…
</code></pre></div>
<p dir="auto"><a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="5234245" data-permission-text="Title is private" data-url="https://github.com/celery/celery/discussions/8268" data-hovercard-type="discussion" data-hovercard-url="/celery/celery/discussions/8268/hovercard" href="https://github.com/celery/celery/discussions/8268">#8268</a> seems unrelated, because it has a different message.</p>
<p dir="auto">-I'm using celery Version: 4.1.1</p>
<p dir="auto">In the celery Task I'm using group, chain and chord from celery<br>
To excute the task I need to set the --concurrency=4<br>
everything works fine</p>
<p dir="auto">When I call pytest, using the worker for test (celery_session_worker) to test this task,  a timeout excpetion occured.</p>
<p dir="auto">Can you please advise how I can use the <strong>celery_session_worke</strong>r with <strong>--concurrency=4.</strong></p>
<p dir="auto">Thanks in advance.</p>