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fix(nexus): assertion failure when unpublishing a faulted nexus #604
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Bug Fixes
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chriswldenyer
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LGTM but see comment. Maybe mention in the description that IOs now fail when there are no children, and that the timeout test is back in action.
mtzaurus
reviewed
Jan 6, 2021
gila
reviewed
Jan 6, 2021
mtzaurus
approved these changes
Jan 6, 2021
The assertion occurs due to the nvmf subsystem transitioning from a paused to an inactive state, which is forbidden. Always resume the nexus in child_retire so that it is usually in the active state, which avoids the assertion when unpublishing it. When there is only a single faulted child, the nexus itself is in a faulted state, which means no IO is possible. In nexus_bdev, fail the IO if all submissions failed, which also includes the case where no submissions were made. Refactor the post-IO submission to avoid repetition. Also include the case where no usable child was found when doing a round-robin for reads. This also fixes CAS-606. Repurpose the existing cargo test for a replica that is stopped, then continued, to test the cases above with a single remote replica.
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The assertion occurs due to the nvmf subsystem transitioning from a
paused to an inactive state, which is forbidden. Always resume the
nexus in child_retire so that it is usually in the active state, which
avoids the assertion when unpublishing it.
Fixes #549, CAS-549, CAS-606.