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All open patches have to be abandoned in order to be able to delete the branch.","accounts_in_message":[],"_revision_number":1}],"current_revision_number":1,"current_revision":"d779e46eef2474d2bed6865481af64176116ab0d","revisions":{"d779e46eef2474d2bed6865481af64176116ab0d":{"kind":"REWORK","_number":1,"created":"2022-04-07 15:55:33.000000000","uploader":{"_account_id":9708,"name":"Balazs Gibizer","display_name":"gibi","email":"gibizer@gmail.com","username":"gibi"},"ref":"refs/changes/94/836994/1","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/nova","ref":"refs/changes/94/836994/1","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/nova refs/changes/94/836994/1 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/nova refs/changes/94/836994/1 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/nova refs/changes/94/836994/1 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/nova refs/changes/94/836994/1"}}},"commit":{"parents":[{"commit":"61538121ebadaff2ccc4b4814e38481b540c1bde","subject":"Reproduce bug 1944759","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/61538121ebadaff2ccc4b4814e38481b540c1bde"}]}],"author":{"name":"Balazs Gibizer","email":"balazs.gibizer@est.tech","date":"2021-09-24 13:17:28.000000000","tz":120},"committer":{"name":"Balazs Gibizer","email":"gibi@redhat.com","date":"2022-04-07 15:54:23.000000000","tz":120},"subject":"Store old_flavor already on source host during resize","message":"Store old_flavor already on source host during resize\n\nDuring resize, on the source host, in resize_instance(), the instance.host\nand .node is updated to point to the destination host. This indicates to\nthe source host\u0027s resource tracker that the allocation of this instance\ndoes not need to be tracked as an instance but as an outbound migration\ninstead. However for the source host\u0027s resource tracker to do that it,\nneeds to use the instance.old_flavor. Unfortunately the\ninstance.old_flavor is only set during finish_resize() on the\ndestination host. (resize_instance cast to the finish_resize). So it is\npossible that a running resize_instance() set the instance.host to point\nto the destination and then before the finish_resize could set the\nold_flavor an update_available_resources periodic runs on the source\nhost. This causes that the allocation of this instance is not tracked as\nan instance as the instance.host point to the destination but it is not\ntracked as a migration either as the instance.old_flavor is not yet set.\nSo the allocation on the source host is simply dropped by the periodic\njob.\n\nWhen such migration is confirmed the confirm_resize() tries to drop\nthe same resource allocation again but fails as the pinned CPUs of the\ninstance already freed.\n\nWhen such migration is reverted instead, then revert succeeds but the\nsource host resource allocation will not contain the resource allocation\nof the instance until the next update_available_resources periodic runs\nand corrects it.\n\nThis does not affect resources tracked exclusively in placement (e.g.\nVCPU, MEMORY_MB, DISK_GB) but it does affect NUMA related resource that\nare still tracked in the resource tracker (e.g. huge pages, pinned\nCPUs).\n\nThis patch moves the instance.old_flavor setting to the source node to\nthe same transaction that sets the instance.host to point to the\ndestination host. Hence solving the race condition.\n\nChange-Id: Ic0d6c59147abe5e094e8f13e0d3523b178daeba9\nCloses-Bug: #1944759\n(cherry picked from commit b841e553214be9a732703e2dfed6c97698ef9b71)\n(cherry picked from commit d4edcd62bae44c01885268a6cf7b7fae92617060)\n(cherry picked from commit c8b04d183f560a616a79577c4d4ae9465d03e541)\n(cherry picked from commit 34e0c0205b1053d3bbe064177740aba654997fe0)\n(cherry picked from commit daf4d622e87b2d76764faedac5b4885bf810ea68)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/d779e46eef2474d2bed6865481af64176116ab0d"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/d779e46eef2474d2bed6865481af64176116ab0d"}]},"branch":"refs/heads/stable/train"}},"requirements":[],"submit_records":[],"submit_requirements":[{"name":"Verified","description":"Verified in gate by CI","status":"UNSATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Verified\u003dMAX AND -label:Verified\u003dMIN","fulfilled":false,"status":"FAIL","passing_atoms":[],"failing_atoms":["label:Verified\u003dMAX","label:Verified\u003dMIN"],"atom_explanations":{}}},{"name":"Code-Review","description":"Code reviewed by core reviewer","status":"UNSATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Code-Review\u003dMAX AND -label:Code-Review\u003dMIN","fulfilled":false,"status":"FAIL","passing_atoms":[],"failing_atoms":["label:Code-Review\u003dMAX","label:Code-Review\u003dMIN"],"atom_explanations":{}}},{"name":"Review-Priority","description":"Review Priority","status":"NOT_APPLICABLE","is_legacy":false,"applicability_expression_result":{"fulfilled":false,"status":"FAIL"},"submittability_expression_result":{"expression":"is:true","fulfilled":true,"status":"NOT_EVALUATED","passing_atoms":[],"failing_atoms":[],"atom_explanations":{}}},{"name":"Workflow","description":"Approved for gate by core reviewer","status":"UNSATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Workflow\u003dMAX AND -label:Workflow\u003dMIN","fulfilled":false,"status":"FAIL","passing_atoms":[],"failing_atoms":["label:Workflow\u003dMAX","label:Workflow\u003dMIN"],"atom_explanations":{}}}]}