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

[builder--- via Gcc-testresults]

A build exception has been detected on builder gcc-fedora-mingw while building 
gcc.

Full details are available at:
    https://builder.sourceware.org/buildbot/#/builders/262/builds/6434

Build state: worker cannot substantiate
Revision: (unknown)
Worker: bb3
Build Reason: (unknown)
Blamelist: GCC Administrator <gccad...@gcc.gnu.org>

Steps:

- 0: worker_preparation ( exception )
    Logs:
        - err.text: 
https://builder.sourceware.org/buildbot/#/builders/262/builds/6434/steps/0/logs/err_text
        - err.html: 
https://builder.sourceware.org/buildbot/#/builders/262/builds/6434/steps/0/logs/err_html