This should be fixed with the latest CL in  bug 742894 . Can you try again?

Started another bisect job:
https://chromeperf.appspot.com/buildbucket_job_status/8974060211978385264

The bisect job went past the original failure point, but now it failed at "Post bisect results" step, with "500 Internal Server Error". Could you please take a look at https://build.chromium.org/p/tryserver.chromium.perf/builders/mac_10_12_perf_bisect/builds/348

Simon,  can you take a look? searching go/chromeperf-logs for 'path:/post_biset_results status:500' gives errors like this:

'ascii' codec can't encode character u'\xed' in position 114: ordinal not in range(128) (/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py:1553)
Traceback (most recent call last):
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1536, in __call__
    rv = self.handle_exception(request, response, e)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1530, in __call__
    rv = self.router.dispatch(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1278, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1102, in __call__
    return handler.dispatch()
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 572, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 570, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~chromeperf/clean-sullivan-7a8b1fc5.402644400137199241/dashboard/post_bisect_results.py", line 73, in post
    update_bug_with_results.UpdateQuickLog(job, in_progress=True)
  File "/base/data/home/apps/s~chromeperf/clean-sullivan-7a8b1fc5.402644400137199241/dashboard/update_bug_with_results.py", line 439, in UpdateQuickLog
    logger.Log(report, record_id=job.log_record_id)
  File "/base/data/home/apps/s~chromeperf/clean-sullivan-7a8b1fc5.402644400137199241/dashboard/quick_logger.py", line 235, in Log
    message = str(message)
UnicodeEncodeError: 'ascii' codec can't encode character u'\xed' in position 114: ordinal not in range(128)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c11ba88cadf0f4d5b08616dc302b91d8fd16525a

commit c11ba88cadf0f4d5b08616dc302b91d8fd16525a
Author: catapult-deps-roller@chromium.org <catapult-deps-roller@chromium.org>
Date: Mon Jul 17 22:35:15 2017

Roll src/third_party/catapult/ 64ca2b5ad..a9f03426f (4 commits)

https://chromium.googlesource.com/external/github.com/catapult-project/catapult.git/+log/64ca2b5ad4d4..a9f03426f2e4

$ git log 64ca2b5ad..a9f03426f --date=short --no-merges --format='%ad %ae %s'
2017-07-17 simonhatch Dashboard - Change /get_histogram to always use same error message.
2017-07-17 trojal Add lowmemorykiller events to Memory Events track.
2017-07-17 simonhatch Dashboard - Convert bisect report from unicode.
2017-07-17 perezju [devil] Include stderr on RunShellCommand with large_output

Created with:
  roll-dep src/third_party/catapult
BUG= 743171 


Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls


CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel
TBR=sullivan@chromium.org

Change-Id: Ida3150a9fd640b0f0dbaa0f30a0c03e2e65802ae
Reviewed-on: https://chromium-review.googlesource.com/575352
Reviewed-by: <catapult-deps-roller@chromium.org>
Commit-Queue: <catapult-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487279}
[modify] https://crrev.com/c11ba88cadf0f4d5b08616dc302b91d8fd16525a/DEPS

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