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However,\nthe hypervisor handling the RPC may still be in the\nreserve_block_device_name and try to create a block device mapping\nrecord in the database. Since nova-cloud-controller considers the\nattachment as failed, it never notifies cinder and this creates a\ndiscrepancy between nova and cinder on whether the state of the volume\nis available or attached. This resolves the issue by stopping the\nattachment on the hypervisor side if it notices that\nnova-cloud-controller has reset the instance task_state.\n\nRelated-Bug: #2141355\nChange-Id: I52679769b3e2ac52638b5a9670af9bb0c708b2f4\nSigned-off-by: Bryan Fraschetti \u003cbryan.fraschetti@canonical.com\u003e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/9894d1090c5208e741f3321bd9cfabb2b4cde60e"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/9894d1090c5208e741f3321bd9cfabb2b4cde60e"}]},"branch":"refs/heads/master"},"56f1d2a4e75c984364131d1a600bc0d661d26416":{"kind":"TRIVIAL_REBASE","_number":2,"created":"2026-08-05 19:20:51.000000000","uploader":{"_account_id":37309,"name":"Bryan Fraschetti","display_name":"Bryan Fraschetti","email":"bryan.fraschetti@canonical.com","username":"bryanfraschetti"},"ref":"refs/changes/19/985719/2","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/nova","ref":"refs/changes/19/985719/2","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/nova refs/changes/19/985719/2 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/nova refs/changes/19/985719/2 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/nova refs/changes/19/985719/2 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/nova refs/changes/19/985719/2"}}},"commit":{"parents":[{"commit":"4c79abf910583ddb89833fc1d79ee1664d64bb32","subject":"Reject to attach and detach volume while task_state is not None","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/4c79abf910583ddb89833fc1d79ee1664d64bb32"}]}],"author":{"name":"Bryan Fraschetti","email":"bryan.fraschetti@canonical.com","date":"2026-04-16 13:14:41.000000000","tz":-240},"committer":{"name":"Bryan Fraschetti","email":"bryan.fraschetti@canonical.com","date":"2026-08-05 19:11:23.000000000","tz":-240},"subject":"Reject Volume Attachment if task_state not Attaching","message":"Reject Volume Attachment if task_state not Attaching\n\nIn the event of an oslo timeout nova-cloud-controller sees the\nattachment as failed and sets the instance task_state to None. 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