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-16203 Lustre <p>there are reported situations when llog catalog has zeros at record place in the middle of llog. Also reported catalog has created but never used plain llogs or partially used though never deleted plain llogs in the middle. </p> <p>Whole problem could be related to 'next' llog handling for remote llog, it looks like several next llogs could be created at the same time with only one (the last one) used actually. If some of creation failed for any reason, the last one still would have all bits are set in header update and will write it down while records are missing. That would explain zeroed holes in the middle of catalog. Details are not clear yet, it is to investigate.</p> <p>Meanwhile catalog llog could still be processed even with such corruptions and that could help to handle such situations gracefully while problem is being investigated</p> LU-16203

zero records and empty plain llogs in update llog catalog

Bug Major Resolved Fixed Mikhail Pershin Mikhail Pershin Mon, 3 Oct 2022 10:44:06 +0000 Tue, 26 Sep 2023 08:00:36 +0000 Tue, 8 Nov 2022 13:46:44 +0000 Lustre 2.16.0 0 8 <p>"Mikhail Pershin &lt;mpershin@whamcloud.com&gt;" uploaded a new patch: <a href="https://review.whamcloud.com/c/fs/lustre-release/+/48776" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/c/fs/lustre-release/+/48776</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-16203" title="zero records and empty plain llogs in update llog catalog" class="issue-link" data-issue-key="LU-16203"><del>LU-16203</del></a> llog: skip bad records in llog<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: 43bdf80cbf52c4a2fc27aebe49c8996fa3818fa5</p> <p>"Jian Yu &lt;yujian@whamcloud.com&gt;" uploaded a new patch: <a href="https://review.whamcloud.com/c/fs/lustre-release/+/48902" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/c/fs/lustre-release/+/48902</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-16203" title="zero records and empty plain llogs in update llog catalog" class="issue-link" data-issue-key="LU-16203"><del>LU-16203</del></a> llog: skip bad records in llog<br/> Project: fs/lustre-release<br/> Branch: b2_15<br/> Current Patch Set: 1<br/> Commit: 8b5e5ccfa8ff52703ed9c860e5b27f07ccdc2fb1</p> <p>regarding several crashes during testing. I've checked dump and found that list head is corrupted:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>struct lu_context {   lc_tags = 256,   lc_state = LCS_FINALIZED,   lc_thread = 0xffff8f0bbb382100,   lc_value = 0xffff8f0b5e215800,   lc_remember = {     next = 0x6400000100, &lt;------ is not expected     prev = 0xffff8f0b8cb4fb98   },   lc_version = 45,   lc_cookie = 0 } </pre> </div></div> <p>considering that lc_remembered is not used in this context ever, it looks like write at wrong address or by stale pointer maybe. I didn't find any further clues yet</p> <p>so far I tend to think this is unrelated to patch itself but more likely casue issue to be seen. I think we can land patch as is, in meantime I'd re-check llog_test for possible lu_env/lu_context usage issues</p> <p>"Oleg Drokin &lt;green@whamcloud.com&gt;" merged in patch <a href="https://review.whamcloud.com/c/fs/lustre-release/+/48776/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/c/fs/lustre-release/+/48776/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-16203" title="zero records and empty plain llogs in update llog catalog" class="issue-link" data-issue-key="LU-16203"><del>LU-16203</del></a> llog: skip bad records in llog<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: cf121b16685fe2a271b1b3c5e97eabcfe01aac8a</p> <p>Landed for 2.16</p> Gantt End to Start Related LU-15938 Development Rank 1|i031tb: Rank (Obsolete) 9223372036854775807 Severity