Build stuck in running state and the next stage started despite the previous stage failure

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1

https://travis-ci.org/akimd/bison/builds/600582734

I have pushed -f quickly, and travis seems to have not noticed that it faced a failure. The log reveals:

$ git checkout -qf adb073139a8a3af2c1f26848377b1b55fc8dc752

167fatal: reference is not a tree: adb073139a8a3af2c1f26848377b1b55fc8dc752

168The command “git checkout -qf adb073139a8a3af2c1f26848377b1b55fc8dc752” failed and exited with 128 during .

169

170Your build has been stopped.

yet the remainder of the pipeline seems not to have noticed the failure of the first step.