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{"id":"openstack%2Fdevstack-gate~247004","triplet_id":"openstack%2Fdevstack-gate~master~Ib48fc921c282ec7dad4a9e18460f2a064faae182","project":"openstack/devstack-gate","branch":"master","topic":"ebtables_race","hashtags":[],"change_id":"Ib48fc921c282ec7dad4a9e18460f2a064faae182","subject":"enable ebtables workaround in devstack","status":"MERGED","created":"2015-11-18 16:08:49.000000000","updated":"2015-11-18 23:24:17.000000000","submitted":"2015-11-18 23:24:17.000000000","submitter":{"_account_id":3,"name":"Jenkins","username":"jenkins"},"total_comment_count":0,"unresolved_comment_count":0,"has_review_started":true,"meta_rev_id":"10a76ddf5243a907f96907fc9e06350449ab9f48","_number":247004,"virtual_id_number":247004,"owner":{"_account_id":2750,"name":"Sean Dague","email":"sean@dague.net","username":"sdague"},"actions":{},"labels":{"Verified":{"approved":{"_account_id":3,"name":"Jenkins","username":"jenkins"},"all":[{"value":0,"_account_id":1,"name":"James E. 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This is because ebtables and the interfaces on\nthe kernel are not multi process safe. If you run ebtables twice\nsimultaneously it can bounce off the kernel or even possibly corrupt\nthe ebtables state.\n\nThis was addressed by adding a --concurrent flag in ebtables, however\nevery program calling ebtables must opt into using that flag. And if\nanyone doesn\u0027t, the race remains. Nova is getting this support now,\nlibvirt gained it in 1.2.11, after metacloud discovered this\nissue. However libvirt 1.2.11 is newer than we have in the gate.\n\nWe have an alternative workaround in devstack which replaces\n/sbin/ebtables with a shell script that flocks and calls the real\nebtables behind the scene. This will work to stop bleeding out on this\nbug and creating recheck madness.\n\nBecause this moves a file in /sbin, it\u0027s an opt in flag. As after a\npackage upgrade on a devstack it will be undone. However for the\nsingle use case in devstack-gate it\u0027s fine, and should massively\ndecrease the race failures we find in the gate.\n\nDepends-On: Ic6fa847eba34c21593b9df86a1c2c179534d0ba5\n\nChange-Id: Ib48fc921c282ec7dad4a9e18460f2a064faae182\nRelated-Bug: #1501558\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/devstack-gate/commit/dfde77960d89e00eb780d0909b94230812a2a5a2"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/devstack-gate/commit/dfde77960d89e00eb780d0909b94230812a2a5a2"}]},"branch":"refs/heads/master"}},"requirements":[],"submit_records":[],"submit_requirements":[]}