tree 2eede0cd9832c7d88b694c484c68aac44a6f909a
parent 995d75c40d63334c2faab406ddd6962662c56a29
author Ian Zerny <zerny@google.com> 1616135475 +0100
committer Ian Zerny <zerny@google.com> 1616135475 +0100

Use thread-safe seen set for unique context assertion.

This appears to be the cause of hanging processes on internal bots.

Change-Id: I0400f54827501674f5a7d1bbb4bef9f871e2c5da