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hugo/content/en/news/0.36.1-relnotes/index.md
Bjørn Erik Pedersen 766085c2dc Squashed 'docs/' changes from a4fa0d1d6..81847981f 
81847981f Add notes for installing "extended" Sass/SCSS version
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git-subtree-dir: docs
git-subtree-split: 81847981f1f2cb1ebc83d42d275a2afb2bb22df1
2018-08-01 10:01:05 +02:00

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date: 2018-02-15 title: "Hugo 0.36.1: One Bugfix" description: "Fixes a multi-thread image processing issue." categories: ["Releases"] images:

  • images/blog/hugo-bug-poster.png
This release fixes a multi-thread issue when reprocessing and reusing images across pages. When doing something like this with the same image from a partial used in, say, both the home page and the single page:

{{ with $img }}
{{ $big := .Fill "1024x512 top" }}
{{ $small := $big.Resize "512x" }}
{{ end }}

There would be timing issues making Hugo in some cases trying to process the same image twice at the same time.

You would experience errors of type:

png: invalid format: not enough pixel data

This commit fixes that by adding a mutex per image. This should also improve the performance, slightly, as it avoids duplicate work.

The current workaround before this fix is to always operate on the original:

{{ with $img }}
{{ $big := .Fill "1024x512 top" }}
{{ $small := .Fill "512x256 top" }}
{{ end }}

This error was rare (no reports on GitHub or the discussion forum), but very hard to debug for the end user.