hugo server: fatal error: concurrent map read and map write

[bep]

Probably something I introduced lately. Will fix.

fatal error: concurrent map read and map write

WARNING: DATA RACE
Read at 0x00c4227c7810 by goroutine 78:
  text/template.(*state).walkTemplate()
      /usr/local/Cellar/go/1.7.4/libexec/src/text/template/exec.go:383 +0x354
  text/template.(*state).walk()
      /usr/local/Cellar/go/1.7.4/libexec/src/text/template/exec.go:239 +0x3a4
  text/template.(*state).walk()
      /usr/local/Cellar/go/1.7.4/libexec/src/text/template/exec.go:234 +0x1f7
  text/template.(*Template).execute()
      /usr/local/Cellar/go/1.7.4/libexec/src/text/template/exec.go:189 +0x4a2
  text/template.(*Template).Execute()
      /usr/local/Cellar/go/1.7.4/libexec/src/text/template/exec.go:175 +0x64
  html/template.(*Template).Execute()
      /usr/local/Cellar/go/1.7.4/libexec/src/html/template/template.go:104 +0xd0
  github.com/spf13/hugo/hugolib.(*Site).renderThing()
      /Users/bep/go/src/github.com/spf13/hugo/hugolib/site.go:1890 +0xdb
  github.com/spf13/hugo/hugolib.(*Site).renderForLayouts()
      /Users/bep/go/src/github.com/spf13/hugo/hugolib/site.go:1862 +0xf0
  github.com/spf13/hugo/hugolib.(*Site).renderAndWritePage()
      /Users/bep/go/src/github.com/spf13/hugo/hugolib/site.go:1768 +0x130
  github.com/spf13/hugo/hugolib.pageRenderer()
      /Users/bep/go/src/github.com/spf13/hugo/hugolib/site_render.go:71 +0x4ea

Previous write at 0x00c4227c7810 by goroutine 18:
  text/template.(*Template).AddParseTree()
      /usr/local/Cellar/go/1.7.4/libexec/src/text/template/template.go:125 +0xf8
  html/template.(*escaper).commit()
      /usr/local/Cellar/go/1.7.4/libexec/src/html/template/escape.go:746 +0x30c
  html/template.escapeTemplate()
      /usr/local/Cellar/go/1.7.4/libexec/src/html/template/escape.go:39 +0x4fd
  html/template.(*Template).escape()
      /usr/local/Cellar/go/1.7.4/libexec/src/html/template/template.go:85 +0x2fb
  html/template.(*Template).Execute()
      /usr/local/Cellar/go/1.7.4/libexec/src/html/template/template.go:101 +0x3c
  github.com/spf13/hugo/hugolib.(*Site).renderThing()
      /Users/bep/go/src/github.com/spf13/hugo/hugolib/site.go:1890 +0xdb
  github.com/spf13/hugo/hugolib.(*Site).renderForLayouts()
      /Users/bep/go/src/github.com/spf13/hugo/hugolib/site.go:1862 +0xf0
  github.com/spf13/hugo/hugolib.(*Site).renderAndWritePage()
      /Users/bep/go/src/github.com/spf13/hugo/hugolib/site.go:1768 +0x130
  github.com/spf13/hugo/hugolib.pageRenderer()
      /Users/bep/go/src/github.com/spf13/hugo/hugolib/site_render.go:71 +0x4ea

[bep]

Running it under the race detector, it does look like the situation we had with the base templates. Will have to look further into this ... Hmm ...

[github-actions]

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