<p>Unfortunately this issue is a bit more delicate. The problem is that <code>-&gt;prev</code> should <em>never</em> be NULL,  otherwise it wouldn't have been in the <code>qm-&gt;free_hash[hash]</code> hash.<br>
This is a concurrency problem we are tracing for a while, but unfortunately we couldn't find a fix for it.</p>

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