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From: Frederick Gotham <thomas123@gmx.ca>
To: dm-crypt@saout.de
Date: Tue, 2 Mar 2021 14:36:03 +0100
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Subject: [dm-crypt] Spontaneous Unmounting - LUKS Device Busy
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<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>&nbsp;</div>

<div class="signature">Hi everyone,</div>

<div class="signature">&nbsp;</div>

<div class="signature">I have an SDcard with one partition on it: /dev/mmcblk0p1</div>

<div class="signature">&nbsp;</div>

<div class="signature">This partition is a LUKS volume, so I open it and give it the name &#39;z&#39;, and so I now have the node: /dev/mapper/z</div>

<div class="signature">&nbsp;</div>

<div class="signature">I then mount /dev/mapper/z&nbsp; to the directory&nbsp; /mnt/sdcard</div>

<div class="signature">&nbsp;</div>

<div class="signature">When doing testing on the SDcard, reading and writing data in a predeterimined elaborate pattern, the device &quot;/dev/mapper/z&quot; mysteriously becomes unmounted and this happens predicatably at the same point in the test every time. I don&#39;t know what&#39;s causing the unmounting. Next if I try to close the LUKS volume (either by using cryptsetup or dmsetup remove --force), it says Device Busy and it won&#39;t close (even though it&#39;s not mounted).</div>

<div class="signature">&nbsp;</div>

<div class="signature">Is there any way I can turn on verbose logging for LUKS to try figure out why the volume is being spontaneously unmounted? I was thinking that maybe the intense testing is causing a spike in CPU / RAM usage which might cause an internal &#39;ioctl&#39; command within the kernel to fail with error code EAGAIN (Temporary Unavailable). I haven&#39;t been able to confirm this yet.</div>

<div class="signature">&nbsp;</div>

<div class="signature">With regard to the testing procedure I mentioned above, well I&#39;ve done the same tests on an unencrypted SDcard, and they all work fine. I only get the spontaneous unmounting with a LUKS volume.</div>

<div class="signature">&nbsp;</div>

<div class="signature">I had considered that the device &quot;/dev/mmcblk0p1&quot; might be disappearing and that this might invoke the UDEV script &quot;media-automount&quot; to unmount the volume, however I haven&#39;t been able to confirm yet if this is happening -- I&#39;m waiting for people to get back to me on that.</div>

<div class="signature">&nbsp;</div>

<div class="signature">For the time being I need to see verbose logging from LUKS to see if there&#39;s an error happening somewhere.</div>

<div class="signature">&nbsp;</div>

<div class="signature">Frederick<br/>
&nbsp;</div></div></body></html>

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