bug#56424: hydra.nixos coverage job times out

[Lars Ingebrigtsen <larsi@gnus.org>]

Everything on Nixos seems to be failing now.  For instance:

https://hydra.nixos.org/build/193879284

I'm not sure what the actual failure there is at all, but there's a
bunch of warnings like:

Unescaped left brace in regex is deprecated here (and will be fatal in Perl 5.32), passed through in regex; marked by <-- HERE in m/^\s+@([[:alnum:]][[:alnum:]\-]*)({ <-- HERE })?\s*/ at /nix/store/xbxabhr44naykgf768533sijfcamkyr9-texinfo-6.5/share/texinfo/Texinfo/Parser.pm line 5481.

The actual log ends with:

  GEN      ../../lisp/international/cp51932.el
  GEN      ../../lisp/international/eucjp-ms.el
  GEN      ../../etc/charsets/GB180304.map
  GEN      ../../etc/charsets/JISX2131.map
  GEN      charsets.stamp
make[3]: Leaving directory '/build/bc1m3dggd3vw7606h3asba5nsbx3d3qz-source/admin/charsets'
make[2]: Leaving directory '/build/bc1m3dggd3vw7606h3asba5nsbx3d3qz-source/src'
make[1]: *** [Makefile:537: src] Error 2
make[1]: Leaving directory '/build/bc1m3dggd3vw7606h3asba5nsbx3d3qz-source'
make[1]: Entering directory '/build/bc1m3dggd3vw7606h3asba5nsbx3d3qz-source'
***
*** "make all" failed with exit status 2.

Which isn't very helpful.

Hm...  Oh, the actual error is earlier:


mv: cannot stat 'lisp.mk.tmp': No such file or directory
  GEN      globals.h
  GEN      buildobj.h
  GEN      globals.h
  GEN      buildobj.h
cmp: globals.tmp: No such file or directory
mv: cannot stat 'globals.tmp': No such file or directory
cmp: globals.tmp: No such file or directory
make[1]: *** [Makefile:671: gl-stamp] Error 2
make[1]: Leaving directory '/build/bc1m3dggd3vw7606h3asba5nsbx3d3qz-source/src'
make: *** [Makefile:537: src] Error 2
make: *** Waiting for unfinished jobs....

Either something is very wrong on that build machine, or there's
something very wrong in our build.