<p></p>
<p dir="auto">The problematic piece of kernel code is</p>
<pre><code>        if ((nr == -1UL) && (onr != -1UL))
                goto out; /* Don't set -ENOSYS for SECCOMP */
</code></pre>
<p dir="auto">Here the <code>Don't set -ENOSYS for SECCOMP</code> is the culprit:<br>
when the syscall is cancelled by ptrace/seccomp, the return value must be set properly to -ENOSYS.</p>

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