buildkit-bug

Prerequisite

Configure docker registry appropriately in /build.sh.

Repro

To reproduce, start the server

./run-server.sh

then in a new console, run the build

./build.sh

It seems that the first build successed. Adjust cmd/sample/main.go in any way - add an extra ! to the logger :) Then run the build again,

./build.sh

And this will result in the server panic.

Of note, I saw at least one time when this did not result in a panic. In that case, it seems that the server performed snapshot garbage collection between the two builds. Additionally, a third build caused the same panic.