ChromeOS built with Clang times out on Kraken telemetry test

[cmtice]

Bugzilla Link	25418
Version	unspecified
OS	Linux
Blocks	#24719
CC	@jmolloy

Extended Description

If you build a ChromeOS image for daisy using the LLVM compiler, load the image onto a daisy Chromebook and try to run the Kraken telemetry test on that Chromebook, it hangs. GCC-built images do not have this problem.

python /var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/tools/perf/run_benchmark --browser=cros-chrome --remote=chromeos2-row5-rack4-host6.cros kraken
[ RUN ] http://krakenbenchmark.mozilla.org/kraken-1.1/driver.html
Traceback (most recent call last):
File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/tools/telemetry/telemetry/internal/story_runner.py", line 83, in _RunStoryAndProcessErrorIfNeeded
state.RunStory(results)
File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/tools/telemetry/telemetry/page/shared_page_state.py", line 300, in RunStory
self._current_page, self._current_tab, results)
File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/tools/perf/benchmarks/kraken.py", line 88, in ValidateAndMeasurePage
'document.title.indexOf("Results") != -1', 700)
File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/tools/telemetry/telemetry/internal/browser/web_contents.py", line 129, in WaitForJavaScriptExpression
"""))
TimeoutException: Timed out while waiting 700s for IsJavaScriptExpressionTrue.

JavaScript |this|:
external: [object Object]
chrome: [object Object]
document: [object HTMLDocument]
tests: ai-astar,audio-beat-detection,audio-dft,audio-fft,audio-oscillator,imaging-gaussian-blur,imaging-darkroom,imaging-desaturate,json-parse-financial,json-stringify-tinderbox,stanford-crypto-aes,stanford-crypto-ccm,stanford-crypto-pbkdf2,stanford-crypto-sha256-iterative
categories: ai,audio,imaging,json,stanford
testContents:

...
Then comes a bunch of screen dumps of source files:

Captured full dump in a file, which is too big to attach to this bug. Email me if you want a copy of it.

[cmtice]

assigned to @cmtice

[cmtice]

This bug may be a copy of 25417; more investigation is needed to verify that.

[jmolloy]

Hi Caroline,

I'm afraid this bug report doesn't have enough detail to investigate. From the description it could either be a compiler malfunction or undefined/implementation defined behaviour being relied upon by the program.

I'm afraid compiling up a ChromeOS image and obtaining hardware is beyond the expectataion for a bug investigation on our side. Unfortunately you'll have to investigate further before we can help.

Cheers,

James

[cmtice]

I will do that.