** Also affects: multipath-tools (Ubuntu Xenial) Importance: Undecided Status: New
-- You received this bug notification because you are a member of नेपाली भाषा समायोजकहरुको समूह, which is subscribed to Xenial. Matching subscriptions: Ubuntu 16.04 Bugs https://bugs.launchpad.net/bugs/1621340 Title: 'multipath -r' causes /dev/mapper/<wwid> being removed Status in multipath-tools package in Ubuntu: In Progress Status in multipath-tools source package in Xenial: In Progress Bug description: "multipath -r" causes the /dev/mapper/<wwid> to disappear momentarily, which leads to some issue in consumer applications as such OpenStack. After some investigation, I found that /dev/mapper/<wwid> was deleted by udev during the reload, and it was re-created soon later by multipathd (livdevmapper code of cause). Detailed findings are as follows: For reload in domap (rename as well), case ACT_RELOAD: r = dm_addmap_reload(mpp, params); if (r) r = dm_simplecmd_noflush(DM_DEVICE_RESUME, mpp->alias, 0, MPATH_UDEV_RELOAD_FLAG); break; it passes 0 to dm_simplecmd_noflush as argument for needsync, which makes dm_task_set_cookie call being skipped in dm_simplecmd, if (udev_wait_flag && !dm_task_set_cookie(dmt, &cookie, ((conf->daemon)? DM_UDEV_DISABLE_LIBRARY_FALLBACK : 0) | udev_flags)) { dm_udev_complete(cookie); goto out; } because of the short-circuit evaluation. Thus _do_dm_ioctl in libdevmapper will add DM_UDEV_DISABLE_DM_RULES_FLAG flag to dmi->event_nr, and that will eventually be used in the udev rules (55-dm.rules), ENV{DM_UDEV_DISABLE_DM_RULES_FLAG}!="1", ENV{DM_NAME}=="?*", SYMLINK+="mapper/$env{DM_NAME}" Since the DM_UDEV_DISABLE_DM_RULES_FLAG is set, the rule will not match. As a result the link is removed. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1621340/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~group.of.nepali.translators Post to : group.of.nepali.translators@lists.launchpad.net Unsubscribe : https://launchpad.net/~group.of.nepali.translators More help : https://help.launchpad.net/ListHelp