[qfix] Fix panic on metadata chain elements double Close #1036
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Bolodya1997
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Signed-off-by: Vladimir Popov <vladimir.popov@xored.com>
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| if err != nil { | ||
| del(ctx, connID, &m.Map) | ||
| m.Map.Delete(connID) |
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How is the Close call going to access the metadata it needs to clean up resources? Before it was guaranteed access to that data by del()... now it will not have it at all and we should expect to leak all resources...
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Close is currently making:
next.Server(ctx).Close(store(…), conn)
So it has access to metadata.
Actually the problem before was Close making:
next.Server(ctx).Close(del(…), conn)
And so on double Close there were no metadata.
| md, _ := mdMap.LoadAndDelete(id) | ||
| return context.WithValue(parent, metaDataKey{}, md) | ||
| } | ||
| return parent |
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Its seems to me the better fix here would be:
| return parent | |
| return context.WithValue(parent,metaDataKey{},&metaData{}) |
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I don't think you quite understood my suggestion... I believe that just this change will solve your panic issue, no need for other changes. Small, simple, targeted.
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Oh wait... I read to quickly... you did fix this :)
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So actually this fix leads to the same error, because on L40 we are getting md == nil and so on L41 we just storing it into the context.
But this direction looks better, so:
if _, ok := parent.Value(metaDataKey{}).(*metaData); !ok {
if md, ok := mdMap.LoadAndDelete(id); ok {
return context.WithValue(parent, metaDataKey{}, md)
}
return context.WithValue(parent, metaDataKey{}, new(metaData))
}
return parentSigned-off-by: Vladimir Popov <vladimir.popov@xored.com>
Description
Fixes
metadata.Map(ctx)panic on double Close.Issue link
Related to kind integration tests failure - https://github.com/networkservicemesh/integration-k8s-kind/runs/3136678807?check_suite_focus=true.
How Has This Been Tested?
Types of changes