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Nathan, Ive created a Jira issue for this, <a href="https://jira.whamcloud.com/browse/LU-13285" rel="58166">
LU-13285</a>. In it I attached the output of an strace where I was able to capture a string of both successful and failed df's.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Nathan Dauchy - NOAA Affiliate <nathan.dauchy@noaa.gov><br>
<b>Sent:</b> Thursday, February 20, 2020 2:35 PM<br>
<b>To:</b> Konzem, Kevin P <kkonzem@contractor.usgs.gov><br>
<b>Cc:</b> lustre-discuss@lists.lustre.org <lustre-discuss@lists.lustre.org><br>
<b>Subject:</b> [EXTERNAL] Re: [lustre-discuss] DF bug with lustre 2.12.4</font>
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<div dir="ltr" class="x_gmail_attr">On Thu, Feb 20, 2020 at 11:47 AM Konzem, Kevin P <<a href="mailto:kkonzem@contractor.usgs.gov">kkonzem@contractor.usgs.gov</a>> wrote:<br>
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<span style="font-size:12pt">test this by running 'while [ true ];do /bin/df -TP /performance;done' on two sessions on the same client. As soon as I start the second while loop, the outputs go from:</span><br>
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<span>Filesystem Type 1024-blocks Used Available Capacity Mounted on<br>
</span><span>192.168.0.181@tcp:/perform lustre 71467728 100416 67664944 1% /performance</span></div>
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to:</div>
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<span>Filesystem Type 1024-blocks Used Available Capacity Mounted on<br>
</span><span>192.168.0.181@tcp:/perform lustre 0 -0 -0 50% /performance</span></div>
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<div>Kevin,</div>
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<div>I can confirm seeing this issue intermittently as well, and usually with a re-run of df the results are once again reasonable. It looks like you have a more reliable reproducer though, which is good! A support ticket was opened with our vendor, and they
said if we can capture a "strace" of it for a bad run that might be helpful... but I haven't caught it in the act yet. With your reproducer, can you get that and open a Jira ticket to track the problem?</div>
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<div>As a workaround, try "lfs df" instead, it may take a different code path that avoids the bug.</div>
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<div>-Nathan</div>
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