https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-7465 Lustre <p>The iov_iter_get_pages_alloc function(introduced by 3.16 kernels, <a href="https://jira.whamcloud.com/browse/LU-6260" title="more support for 3.16 linux kernel" class="issue-link" data-issue-key="LU-6260"><del>LU-6260</del></a>) is a kernel function which does not use Lustre's hook to keep track of memory allocation and therefore the number of bytes tallied by Lustre's ll_free_user_pages() appeared to be 'extra'. This happens only to direct io read and it is not a real leak of memory. It can be reproduced by a number of sanity tests, such as 205, to result in the message similar to:</p> <p>25243:0:(class_obd.c:646:cleanup_obdclass()) obd_memory max:<br/> 18446744073709549568, leaked: 18446744073709549568</p> 3.16 and later kernels LU-7465

False positive memory leak in sanity tests due to iov_iter_get_pages_alloc

Bug Minor Resolved Fixed WC Triage Wally Wang patch Mon, 23 Nov 2015 18:07:25 +0000 Mon, 26 Sep 2016 23:00:36 +0000 Thu, 17 Dec 2015 16:00:32 +0000 Lustre 2.8.0 Lustre 2.8.0 0 5 <p>Wally Wang (wang@cray.com) uploaded a new patch: <a href="http://review.whamcloud.com/17342" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/17342</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-7465" title="False positive memory leak in sanity tests due to iov_iter_get_pages_alloc" class="issue-link" data-issue-key="LU-7465"><del>LU-7465</del></a> llite: Do not track memory leak for kernel function<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: dc38ad8d997a7252c6f8d3e246b38dd4d85295c6</p> <p>Frank notes that this is related to <a href="https://jira.whamcloud.com/browse/LU-7052" title="iovec created with iov_iter_get_pages_alloc must be freed with kvfree" class="issue-link" data-issue-key="LU-7052"><del>LU-7052</del></a> and <a href="http://review.whamcloud.com/#/c/16111" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/#/c/16111</a>. Note that that patch was rejected and then abandoned.</p> <p>I don't see any reviews on 16111, so I assume the patch rejection was something that happened internally? In any case, good to see the new patch.</p> <p>I think that it was discussed not in Gerrit, but in <a href="https://jira.whamcloud.com/browse/LU-7052" title="iovec created with iov_iter_get_pages_alloc must be freed with kvfree" class="issue-link" data-issue-key="LU-7052"><del>LU-7052</del></a>.</p> <p>Oleg Drokin (oleg.drokin@intel.com) merged in patch <a href="http://review.whamcloud.com/17342/" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/17342/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-7465" title="False positive memory leak in sanity tests due to iov_iter_get_pages_alloc" class="issue-link" data-issue-key="LU-7465"><del>LU-7465</del></a> llite: Do not track memory leak for kernel function<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: 09141c0796802e7a3471c084ea5928674b3a1862</p> <p>Landed for 2.8</p> Related LU-7052 Development Rank 1|hzxu2f: Rank (Obsolete) 9223372036854775807 Severity