issue18676

command
Version: v0.0.0-...-e0c80c8 Latest Latest
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Published: Aug 23, 2020 License: BSD-3-Clause Imports: 4 Imported by: 0

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Overview

The bug happened like this: 1) The main binary adds an itab for *json.UnsupportedValueError / error

(concrete type / interface type).  This itab goes in hash bucket 0x111.

2) The plugin adds that same itab again. That makes a cycle in the itab

chain rooted at hash bucket 0x111.

3) The main binary then asks for the itab for *dynamodbstreamsevt.Event /

json.Unmarshaler.  This itab happens to also live in bucket 0x111.
The lookup code goes into an infinite loop searching for this itab.

The code is carefully crafted so that the two itabs are both from the same bucket, and so that the second itab doesn't exist in the itab hashmap yet (so the entire linked list must be searched).

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