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28s","accounts_in_message":[],"_revision_number":2},{"id":"6632b43e8c602a700754406cb5bfa45818a47eeb","author":{"_account_id":7166,"name":"Sylvain Bauza","email":"sbauza@redhat.com","username":"sbauza"},"date":"2026-09-17 13:53:35.000000000","message":"Patch Set 2:\n\n(1 comment)","accounts_in_message":[],"_revision_number":2}],"current_revision_number":2,"current_revision":"cabe711e58bcb9e314098361f61dfb0215436e6c","revisions":{"0a4edb3eab27b6f920276af3242fc38ee912028f":{"kind":"REWORK","_number":1,"created":"2026-09-15 13:43:08.000000000","uploader":{"_account_id":7166,"name":"Sylvain Bauza","email":"sbauza@redhat.com","username":"sbauza"},"ref":"refs/changes/27/1005727/1","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/nova","ref":"refs/changes/27/1005727/1","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/nova refs/changes/27/1005727/1 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/nova refs/changes/27/1005727/1 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/nova refs/changes/27/1005727/1 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/nova refs/changes/27/1005727/1"}}},"commit":{"parents":[{"commit":"7582db6d65b9880e1ef7d906ddad1d7c95bb53a5","subject":"Merge \"Parallelize per-node resource updates\"","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/7582db6d65b9880e1ef7d906ddad1d7c95bb53a5"}]}],"author":{"name":"Sylvain Bauza","email":"sbauza@redhat.com","date":"2026-09-15 13:38:54.000000000","tz":120},"committer":{"name":"Sylvain Bauza","email":"sbauza@redhat.com","date":"2026-09-15 13:42:04.000000000","tz":120},"subject":"Guard against deleting a concurrent request\u0027s BDM on timeout","message":"Guard against deleting a concurrent request\u0027s BDM on timeout\n\nWhen reserve_block_device_name times out with a MessagingTimeout in\nthe conductor\u0027s attach_volume flow, the cleanup code uses\nget_by_volume_and_instance() to find and destroy the orphaned BDM.\nThis lookup is imprecise: it matches any BDM for the given volume\nand instance pair, not specifically the one from the timed-out\nrequest.\n\nWhen a concurrent request (e.g. a K8s CSI retry) has already created\na BDM and progressed to reserving a Cinder attachment, the cleanup\ncan delete that BDM instead. This leaves Cinder with an active\nattachment and libvirt with a configured block device while Nova\u0027s\ndatabase has no corresponding BDM record. The instance is then stuck\nin an inconsistent state: detach attempts return 404 because Nova\ndoes not know about the attachment, and re-attach attempts fail\nbecause Cinder reports the volume as in-use.\n\nBefore destroying the BDM, check whether attachment_id is set. If\nit is, the BDM has already been reserved in Cinder by a different\nrequest and must not be deleted. Log a warning and skip the cleanup\ninstead.\n\nChange-Id: I07e404c59d035ed25ae5903a9fdd5a5f509b9c1a\nRelated-Bug: #2141355\nAssisted-By: Cursor claude-4.6-opus\nSigned-off-by: Sylvain Bauza \u003csbauza@redhat.com\u003e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/0a4edb3eab27b6f920276af3242fc38ee912028f"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/0a4edb3eab27b6f920276af3242fc38ee912028f"}]},"branch":"refs/heads/master"},"cabe711e58bcb9e314098361f61dfb0215436e6c":{"kind":"TRIVIAL_REBASE_WITH_MESSAGE_UPDATE","_number":2,"created":"2026-09-17 10:38:43.000000000","uploader":{"_account_id":7166,"name":"Sylvain Bauza","email":"sbauza@redhat.com","username":"sbauza"},"ref":"refs/changes/27/1005727/2","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/nova","ref":"refs/changes/27/1005727/2","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/nova refs/changes/27/1005727/2 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/nova refs/changes/27/1005727/2 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/nova refs/changes/27/1005727/2 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/nova refs/changes/27/1005727/2"}}},"commit":{"parents":[{"commit":"94de0576ca02e0668233bedfbe7e18b87316c708","subject":"Update master for stable/2026.2","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/94de0576ca02e0668233bedfbe7e18b87316c708"}]}],"author":{"name":"Sylvain Bauza","email":"sbauza@redhat.com","date":"2026-09-15 13:38:54.000000000","tz":120},"committer":{"name":"Sylvain Bauza","email":"sbauza@redhat.com","date":"2026-09-17 10:29:41.000000000","tz":120},"subject":"Guard against deleting a concurrent request\u0027s BDM on timeout","message":"Guard against deleting a concurrent request\u0027s BDM on timeout\n\nThe conductor\u0027s attach_volume flow calls reserve_block_device_name\nas a synchronous RPC to compute. If the call times out with a\nMessagingTimeout, the cleanup code uses get_by_volume_and_instance()\nto find and destroy the BDM. This lookup is imprecise: it matches\nany BDM for the given volume and instance pair, not specifically the\none from the timed-out request.\n\nA concurrent request (e.g. a K8s CSI retry) can create its own BDM\nfor the same volume while the first request is stalled. This is\npossible because no task_state is set on the instance during volume\nattach, so nothing prevents a second API request from entering the\nconductor\u0027s attach_volume concurrently. On the compute side,\nreserve_block_device_name takes an instance lock and rejects\nduplicates, so only request 2 creates a BDM — request 1 is never\nprocessed.\n\nWhen request 1 times out, its cleanup finds and deletes request 2\u0027s\nBDM. If request 2 has already reserved the volume in Cinder\n(attachment_id is set) and the attach_volume cast was sent, this\nleaves a three-way inconsistency: Cinder shows the volume in-use,\nlibvirt has the block device, but Nova has no BDM.\n\nBefore destroying the BDM, check whether attachment_id is set. If\nit is, the BDM has been reserved in Cinder by a different request\nand must not be deleted.\n\nThis does not fully close the race: if request 2 has created the\nBDM but has not yet called Cinder (attachment_id is still None),\nthe cleanup would still delete it. However, in that case Cinder was\nnever contacted and the attach_volume cast was never sent, so the\nresulting state (dangling Cinder reservation at most, no libvirt\ndevice) is recoverable. The remaining window is also narrow in\npractice: it is the time between _create_volume_bdm() returning and\nthe Cinder attachment_create call completing, while the timeout\nfires after rpc_response_timeout (60s+).\n\nThe full fix for preventing concurrent requests would require\nsetting a task_state on the instance during attach, which has\nupgrade implications and is left for a follow-up.\n\nChange-Id: I07e404c59d035ed25ae5903a9fdd5a5f509b9c1a\nCloses-Bug: #2167569\nRelated-Bug: #2141355\nAssisted-By: Cursor claude-4.6-opus\nSigned-off-by: Sylvain Bauza \u003csbauza@redhat.com\u003e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/cabe711e58bcb9e314098361f61dfb0215436e6c"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/cabe711e58bcb9e314098361f61dfb0215436e6c"}]},"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":""}}}]}