fix data race in node upsert #24127
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fix data race in node upsert #24127
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tgross
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backport/ent/1.7.x+ent
tgross
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Oct 3, 2024
nomad/structs/structs.go
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| // COMPAT remove in 1.9+ | ||
| // apply compatibility fixups covering node topology |
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@shoenig: is this instead safe to simply remove in 1.9 as suggested by this comment? It looks like we introduced this in 1.6.x. We'll need to be safe for folks to upgrade from 1.6.x to 1.9 but not earlier than that.
We introduced this in 1.7. We should hold off removing until 1.10 LTS. I've updated the associated comments in this PR.
While testing with agents built with the race-detection option enabled, I encountered a data race while draining a node. When we upsert a node we copy the `NodeResources` struct and then perform a fixup for backwards compatibility of the topology struct. This fixup was being executed on the original struct and not the copy, which means we're uselessly fixing up the wrong struct and we're corrupting the state store in the process (albeit harmlessly, I suspect). Fix the data race by calling the method on the correct pointer.
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While testing with agents built with the race-detection option enabled, I encountered a data race while draining a node.
When we upsert a node we copy the
NodeResourcesstruct and then perform a fixup for backwards compatibility of the topology struct. This fixup was being executed on the original struct and not the copy, which means we're uselessly fixing up the wrong struct and we're corrupting the state store in the process (albeit harmlessly, I suspect).Fix the data race by calling the method on the correct pointer.