☝ Buildbot (Sourceware): gccrust - worker cannot substantiate (master)

[builder]

A build exception has been detected on builder gccrust-fedora-x86_64 while 
building gccrust.

Full details are available at:
    https://builder.sourceware.org/buildbot/#/builders/16/builds/5090

Build state: worker cannot substantiate
Revision: (unknown)
Worker: sw3bb1
Build Reason: (unknown)
Blamelist: Philip Herron <herron.phi...@googlemail.com>

Steps:

- 0: worker_preparation ( exception )
    Logs:
        - err.text: 
https://builder.sourceware.org/buildbot/#/builders/16/builds/5090/steps/0/logs/err_text
        - err.html: 
https://builder.sourceware.org/buildbot/#/builders/16/builds/5090/steps/0/logs/err_html