Whamcloud Community JIRA https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 [LU-1418] (osc_lock.c:1099:osc_lock_enqueue_wait()) DEADLOCK POSSIBLE! - too many https://jira.whamcloud.com/browse/LU-1418 Lustre <p>The console log contains 100's of "DEADLOCK POSSIBLE!" errors, followed by debug data and a stack trace. The messages sound like something is seriously wrong, but there's no sign that a deadlock has actually occurred. To the contrary, evidence indicates that the app continues executing and completes successfully.</p> LU-1418 (osc_lock.c:1099:osc_lock_enqueue_wait()) DEADLOCK POSSIBLE! - too many Bug Minor Resolved Fixed Oleg Drokin Alexander Boyko Thu, 17 May 2012 08:55:32 +0000 Wed, 21 Nov 2012 16:24:02 +0000 Mon, 23 Jul 2012 16:54:32 +0000 Lustre 2.3.0 Lustre 2.1.3 0 5 <p>Req <a href="http://review.whamcloud.com/2825" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/2825</a></p> <p>I see that the code in question and the comments were added by Nikita Danilov that happens to work at Xyratex at the moment.</p> <p>It would be really great to get some sort of a clarification from him, and perhaps some sort of a recommendation how to overcome the potential deadlock.</p> <p>I understand that you have not hit the deadlock yet, but it's still theoretically possible it seems, so just dropping the message does not sound like a great option.</p> <p>Besides I don't think I have ever seen this message before?</p> <p>FYI, we are also seeing hundreds of these messages in the client logs with 2.1.1-based code.</p> <p>Xyratex, any comments from Nikita?</p> <p>Not yet.</p> <p>Got respons from Nikita Danilov<br/> &gt;Seems that this deadlock is impossible for the current code, and the check exist from some previous version. It can be removed.</p> <p>Just recently I installed lustre-2.1.2 on our production cluster and I seem to be getting a lot of them in the logs. If they are harmless can they be disabled?</p> <p>Landed for 2.1.3 and 2.3</p> <p>Xyratex <a href="http://jira-nss.xy01.xyratex.com:8080/browse/MRP-497" class="external-link" target="_blank" rel="nofollow noopener">MRP-497</a></p> Development Rank 1|hzv673: Rank (Obsolete) 4538 Severity