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Refresh works -- but up/preview causes the error above..

This looks similar to <https://github.com/pulumi/pulumi/issues/5770> which was fixed recently.

What provider version are you using?

<@UCWG26BH7> - I have a large codebase / stack.  I can't share it easily.

Are you using AWS? If so, can you check that version and update to 3.19.2 which contains the fix?

{
    "name": "aws",
    "devDependencies": {
        "@types/node": "^10.17.45"
    },
    "dependencies": {
        "@pulumi/aws": "^3.21.0",
        "@pulumi/awsx": "^0.23.0",
        "@pulumi/pulumi": "^2.16.0"
    }
}

Different error with 3.19.2:

```fatal error: concurrent map read and map write

goroutine 1932 [running]:
runtime.throw(0x236dde7, 0x21)
        C:/hostedtoolcache/windows/go/1.15.6/x64/src/runtime/panic.go:1116 +0x79 fp=0xc002c4fc70 sp=0xc002c4fc40 pc=0xa4a5d9```

This same stack works in a different environment :confused: