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-2971 Lustre <p>MDT changelog uses incorrect locking order. It should start transaction before writing to llog.</p> LU-2971

deadlock of changelog storing & canceling

Bug Minor Resolved Cannot Reproduce WC Triage Andriy Skulysh Fri, 15 Mar 2013 08:18:57 +0000 Fri, 15 Mar 2013 08:47:46 +0000 Fri, 15 Mar 2013 08:47:46 +0000 0 2 <p>Incorrect locking order results in following deadlock:</p> <p>All mdt threads are waiting to start transaction, but current one is deadlocked by following threads:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>PID: 13564 TASK: ffff880e3ca94100 CPU: 8 COMMAND: "mdt_384" #0 [ffff880e2f567650] schedule at ffffffff814d6f09 #1 [ffff880e2f567718] rwsem_down_failed_common at ffffffff814d9375 #2 [ffff880e2f567778] rwsem_down_write_failed at ffffffff814d94d3 #3 [ffff880e2f5677b8] call_rwsem_down_write_failed at ffffffff8126ee83 #4 [ffff880e2f567818] llog_cat_current_log.clone.0 at ffffffffa058f1cb [obdclass] #5 [ffff880e2f5678b8] llog_cat_add_rec at ffffffffa058feca [obdclass] #6 [ffff880e2f567908] llog_obd_origin_add at ffffffffa0595ad7 [obdclass] #7 [ffff880e2f567938] llog_add at ffffffffa0595cb1 [obdclass] #8 [ffff880e2f567988] mdd_changelog_llog_write at ffffffffa0bf74dc [mdd] #9 [ffff880e2f5679d8] mdd_changelog_ns_store at ffffffffa0be8534 [mdd] #10 [ffff880e2f567a58] mdd_create at ffffffffa0beee7e [mdd] #11 [ffff880e2f567b98] cml_create at ffffffffa0d95467 [cmm] #12 [ffff880e2f567be8] mdt_pdir_hash_lock.clone.0 at ffffffffa0c6792f [mdt] #13 [ffff880e2f567c68] mdt_reint_create at ffffffffa0c67cc8 [mdt </pre> </div></div> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>PID: 13670 TASK: ffff880e2bb3d580 CPU: 2 COMMAND: "mdt_472" #0 [ffff880e2bb3f5c0] schedule at ffffffff814d6f09 #1 [ffff880e2bb3f688] start_this_handle at ffffffffa03e409a [jbd2] #2 [ffff880e2bb3f748] jbd2_journal_start at ffffffffa03e4510 [jbd2] #3 [ffff880e2bb3f798] ldiskfs_journal_start_sb at ffffffffa0d26b28 [ldiskfs] #4 [ffff880e2bb3f7a8] fsfilt_ldiskfs_write_record at ffffffffa0d7152a [fsfilt_ldiskfs] #5 [ffff880e2bb3f7f8] llog_lvfs_write_blob at ffffffffa059144d [obdclass] #6 [ffff880e2bb3f868] llog_lvfs_write_rec at ffffffffa0592d07 [obdclass] #7 [ffff880e2bb3f908] llog_cat_add_rec at ffffffffa058ff69 [obdclass] #8 [ffff880e2bb3f958] llog_obd_origin_add at ffffffffa0595ad7 [obdclass] #9 [ffff880e2bb3f988] llog_add at ffffffffa0595cb1 [obdclass] #10 [ffff880e2bb3f9d8] mdd_changelog_llog_write at ffffffffa0bf74dc [mdd] #11 [ffff880e2bb3fa28] mdd_changelog_write_header at ffffffffa0bf776b [mdd] #12 [ffff880e2bb3fa78] mdd_changelog_llog_cancel at ffffffffa0bf7bb9 [mdd] #13 [ffff880e2bb3fab8] mdd_changelog_user_purge at ffffffffa0bf81c0 [mdd] #14 [ffff880e2bb3fb18] mdd_iocontrol at ffffffffa0bf857c [mdd] </pre> </div></div> <p>Please, ignore this issue. It is already fixed in master </p> <p>ok - thanks Andriy!</p> Development Rank 1|hzvlg7: Rank (Obsolete) 7240 Severity