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If both\nboot request reaches the _validate_instance_group_policy at the same\ntime then both each request will be rejected due to the other request.\nSo we end up in a situation where two instance was booted, one could fit\nto the host, but both request is rejected.\n\nThe root of the problem is that instance.host is set after the resource\nclaim succeeds on the compute, and the policy only checked after this.\nSo it can happen that both instances succeeds to claim, has their\ninstance.host set, and then both calls validate and sees the other\ninstance on the host so fail.\n\nChange-Id: I61a740be2ee7018016bb34e559e66865ab700f9e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/19912e7d736731671e2d15d2ffc07fe01e0025ab"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/19912e7d736731671e2d15d2ffc07fe01e0025ab"}]},"branch":"refs/heads/master"},"3923ffa43abe7c35c59fd25975a62a558e398813":{"kind":"NO_CODE_CHANGE","_number":2,"created":"2024-09-24 15:44:06.000000000","uploader":{"_account_id":9708,"name":"Balazs Gibizer","display_name":"gibi","email":"gibizer@gmail.com","username":"gibi"},"ref":"refs/changes/26/930326/2","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/nova","ref":"refs/changes/26/930326/2","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/nova refs/changes/26/930326/2 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/nova refs/changes/26/930326/2 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/nova refs/changes/26/930326/2 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/nova refs/changes/26/930326/2"}}},"commit":{"parents":[{"commit":"6fb1997def0757d42363ed8c8cc058d0703c4ad6","subject":"Update master for stable/2024.2","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/6fb1997def0757d42363ed8c8cc058d0703c4ad6"}]}],"author":{"name":"Balazs Gibizer","email":"gibi@redhat.com","date":"2024-09-24 13:28:08.000000000","tz":120},"committer":{"name":"Balazs Gibizer","email":"gibi@redhat.com","date":"2024-09-24 15:43:04.000000000","tz":120},"subject":"Reproduce anti-affinity race condition","message":"Reproduce anti-affinity race condition\n\nThere is an anti-affinity policy check in the compute manager to ensure\nthat if parallel scheduling selected the same host for two VMs that are\nin anti-affinity group then the compute manager can catch the race to\navoid violating the anti-affinity policy.\n\nHowever this check is too eager to reject the boot requests. If both\nboot request reaches the _validate_instance_group_policy at the same\ntime then both each request will be rejected due to the other request.\nSo we end up in a situation where two instance was booted, one could fit\nto the host, but both request is rejected.\n\nThe root of the problem is that instance.host is set after the resource\nclaim succeeds on the compute, and the policy only checked after this.\nSo it can happen that both instances succeeds to claim, has their\ninstance.host set, and then both calls validate and sees the other\ninstance on the host so fail.\n\nRelated-Bug: #2081853\nChange-Id: I61a740be2ee7018016bb34e559e66865ab700f9e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/3923ffa43abe7c35c59fd25975a62a558e398813"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/3923ffa43abe7c35c59fd25975a62a558e398813"}]},"branch":"refs/heads/master"},"4259ecf0731abdf9b2521b2b34cccf64660acb36":{"kind":"REWORK","_number":3,"created":"2024-09-25 13:09:58.000000000","uploader":{"_account_id":9708,"name":"Balazs Gibizer","display_name":"gibi","email":"gibizer@gmail.com","username":"gibi"},"ref":"refs/changes/26/930326/3","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/nova","ref":"refs/changes/26/930326/3","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/nova refs/changes/26/930326/3 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/nova refs/changes/26/930326/3 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/nova refs/changes/26/930326/3 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/nova refs/changes/26/930326/3"}}},"commit":{"parents":[{"commit":"6fb1997def0757d42363ed8c8cc058d0703c4ad6","subject":"Update master for stable/2024.2","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/6fb1997def0757d42363ed8c8cc058d0703c4ad6"}]}],"author":{"name":"Balazs Gibizer","email":"gibi@redhat.com","date":"2024-09-24 13:28:08.000000000","tz":120},"committer":{"name":"Balazs Gibizer","email":"gibi@redhat.com","date":"2024-09-25 13:09:42.000000000","tz":120},"subject":"Reproduce anti-affinity race condition","message":"Reproduce anti-affinity race condition\n\nThere is an anti-affinity policy check in the compute manager to ensure\nthat if parallel scheduling selected the same host for two VMs that are\nin anti-affinity group then the compute manager can catch the race to\navoid violating the anti-affinity policy.\n\nHowever this check is too eager to reject the boot requests. If both\nboot request reaches the _validate_instance_group_policy at the same\ntime then both each request will be rejected due to the other request.\nSo we end up in a situation where two instance was booted, one could fit\nto the host, but both request is rejected.\n\nThe root of the problem is that instance.host is set after the resource\nclaim succeeds on the compute, and the policy only checked after this.\nSo it can happen that both instances succeeds to claim, has their\ninstance.host set, and then both calls validate and sees the other\ninstance on the host so fail.\n\nRelated-Bug: #2081853\nChange-Id: I61a740be2ee7018016bb34e559e66865ab700f9e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/4259ecf0731abdf9b2521b2b34cccf64660acb36"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/4259ecf0731abdf9b2521b2b34cccf64660acb36"}]},"branch":"refs/heads/master"}},"requirements":[],"submit_records":[{"rule_name":"gerrit~DefaultSubmitRule","status":"OK","labels":[{"label":"Verified","status":"MAY","applied_by":{"_account_id":22348,"name":"Zuul","username":"zuul","tags":["SERVICE_USER"]}},{"label":"Code-Review","status":"MAY"},{"label":"Workflow","status":"MAY"},{"label":"Review-Priority","status":"MAY"}]}],"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":{"label:Verified\u003dMAX":"","label:Verified\u003dMIN":""}}},{"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":{"label:Code-Review\u003dMAX":"","label:Code-Review\u003dMIN":""}}},{"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":{"label:Workflow\u003dMAX":"","label:Workflow\u003dMIN":""}}}]}