By "disabled" I meant I'm allowing it to pass or timeout on linux msan.

Hmm, in general I guess in this case it might be nicer to have the tests marked Slow if possible.

Note: encoding/textdecoder-labels.html hasn't changed for some time; maybe it was close to the timeout before and the test runner was just running more slowly recently?

The other test (http/tests/streams/writable-streams/write.https.html) was added recently in r430881, and there's no MSAN layout test CQ builder, so it's possible that it has always timed out on the MSAN bot?

textdecoder-labels.html has 3392 tests; each one is a single assert but that might be tripping out MSAN even with its extra timeout.

We can look at consolidating the tests upstream.

Filed https://github.com/w3c/web-platform-tests/pull/4290

(I'm not sure why the test was structured as it was originally.)

Excellent, thanks for making that.

I also made a CL to mark them as slow (https://codereview.chromium.org/2554853003), but if https://github.com/w3c/web-platform-tests/pull/4290 is merged then likely textdecoder-labels.html shouldn't be marked as slow.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/936ea4d1e08c58c6757396db4e3919dd64d9783c

commit 936ea4d1e08c58c6757396db4e3919dd64d9783c
Author: qyearsley <qyearsley@chromium.org>
Date: Wed Dec 07 18:30:54 2016

Change expectations for three layout tests from Timeout Pass to Slow.

Specifically:

 - imported/wpt/encoding/textdecoder-labels.html, and
 - http/tests/streams/writable-streams/write.https.html and related virtual test virtual/mojo-loading/http/tests/streams/writable-streams/write.https.html

BUG= 671164 

Review-Url: https://codereview.chromium.org/2554853003
Cr-Commit-Position: refs/heads/master@{#437014}

[modify] https://crrev.com/936ea4d1e08c58c6757396db4e3919dd64d9783c/third_party/WebKit/LayoutTests/MSANExpectations
[modify] https://crrev.com/936ea4d1e08c58c6757396db4e3919dd64d9783c/third_party/WebKit/LayoutTests/SlowTests

Next step: Check to see if some tests fail on the MSAN bot (https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20Trusty%20MSAN); if the tests still Timeout there, then some other action has to be taken, e.g. splitting up or debugging the tests. Also, I should check whether imported/wpt/encoding/textdecoder-labels.html is still slow after https://github.com/w3c/web-platform-tests/pull/4290.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2c06df626151088d15a0e134dbd7c49350d0f217

commit 2c06df626151088d15a0e134dbd7c49350d0f217
Author: qyearsley <qyearsley@chromium.org>
Date: Fri Jan 20 18:58:04 2017

Remove wpt/encoding/textdecoder-labels.html from SlowTests.

After https://github.com/w3c/web-platform-tests/pull/4290, I believe this test should no longer be slow.

BUG= 671164 

Review-Url: https://codereview.chromium.org/2646883002
Cr-Commit-Position: refs/heads/master@{#445112}

[modify] https://crrev.com/2c06df626151088d15a0e134dbd7c49350d0f217/third_party/WebKit/LayoutTests/SlowTests