In 
https://codereview.chromium.org/1889813002
I had to revert my CL to add tests for OpenTypeCapsSupport, a font helper class which helps us detecting what OpenType feature are available in a font file. This new test adds a new dependency to font files from the LayoutTests/third_party/ directory, where we store fonts from third party origins.

Initially, I had the same issue on an ASAN trybot, but fixed it by adding the files to the  blink_platform_unittests.isolate file:
https://codereview.chromium.org/1882063002#msg19

I added to the blink_platform_unittests.isolate file:
      '../../LayoutTests/third_party/Libertine/',
      '../../LayoutTests/third_party/MEgalopolis/',


Then I landed the tests separately, and now it failed again, but not on the ASAN bot anymore, but on the regular Linux bots.

How can I reproduce this issue? The tests pass just fine on a regular Linux build on my machine. 

Could it be there is an issue with the isolate step not capturing those directories/font files?