The test was recently added and is failing on WebKit Mac10.13. 

https://ci.chromium.org/buildbot/chromium.webkit/WebKit%20Mac10.13%20(retina)/36

I will disable it on Mac. jsbell, the bot mentions you as owner for these tests.

There are additional failures on other mac bots:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.10%20Tests/33853
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.11%20Tests/28139

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/296da10ccaeba62345c660adac672d73e693dd08

commit 296da10ccaeba62345c660adac672d73e693dd08
Author: Christian Dullweber <dullweber@chromium.org>
Date: Wed Jul 18 14:13:45 2018

Disable euckr-decode-ksc_5601.html on Mac

euckr-decode-ksc_5601.html is failing on WebKit Mac10.13.

https://ci.chromium.org/buildbot/chromium.webkit/WebKit%20Mac10.13%20(retina)/36

Tbr: jsbell@chromium.org
Bug: 864994
Change-Id: I5773da2363a7d4b3a9bf85b307fd6ab4b0e7790f
Reviewed-on: https://chromium-review.googlesource.com/1141875
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576031}
[modify] https://crrev.com/296da10ccaeba62345c660adac672d73e693dd08/third_party/WebKit/LayoutTests/TestExpectations

 Issue 865004  has been merged into this issue.