Flaky bot : https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Linux%20Tests%20%28dbg%29%281%29%2832%29?limit=200

First failure @ 8a3b374352516c834b2fb7e7389d2caef2200083 (but since it's flaky the faulty CL could have been a few builds before).

Likely range: https://chromium.googlesource.com/chromium/src/+log/7a09c7c9b43bcdb9d0cb1c84439e3061cab1bbbc..8a3b374352516c834b2fb7e7389d2caef2200083?pretty=fuller&n=10000

Typical failure log:

[ RUN      ] DumpAccessibilityTreeTest.AccessibilityAudio
Xlib:  extension "RANDR" missing on display ":100".

DevTools listening on ws://127.0.0.1:41907/devtools/browser/8b434518-9d42-4c41-b070-d14ff7e92c6b
[21250:21250:0118/051850.603808:INFO:dump_accessibility_browsertest_base.cc(229)] File not found: /b/s/w/ir/content/test/data/accessibility/html/audio-expected-blink.txt
[21250:21250:0118/051850.603925:INFO:dump_accessibility_browsertest_base.cc(230)] No expectation file present, ignoring test on this platform. To run this test anyway, create /b/s/w/ir/content/test/data/accessibility/html/audio-expected-blink.txt (it can be empty) and then run content_browsertests with the switch: --generate-accessibility-test-expectations
[21250:21250:0118/051850.713695:INFO:dump_accessibility_browsertest_base.cc(244)] Testing: /b/s/w/ir/content/test/data/accessibility/html/audio.html
[21250:21250:0118/051850.713836:INFO:dump_accessibility_browsertest_base.cc(246)] Expected output: /b/s/w/ir/content/test/data/accessibility/html/audio-expected-auralinux.txt
../../content/browser/accessibility/dump_accessibility_browsertest_base.cc:378: Failure
Value of: is_different
  Actual: true
Expected: false
Stack trace:
#0 0x0000578ae989 StackTraceGetter::CurrentStackTrace()
#1 0x0000578c2264 testing::internal::UnitTestImpl::CurrentOsStackTraceExceptTop()
#2 0x0000578c1c5e testing::internal::AssertHelper::operator=()
#3 0x0000568dd553 content::DumpAccessibilityTestBase::RunTestForPlatform()
#4 0x0000568db7c7 content::DumpAccessibilityTestBase::RunTest()
#5 0x0000568f28c4 content::DumpAccessibilityTreeTest::RunHtmlTest()
#6 0x0000568eec91 content::DumpAccessibilityTreeTest_AccessibilityAudio_Test::RunTestOnMainThread()
#7 0x000058908ac4 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
(...)

[21250:21250:0118/051851.505551:ERROR:dump_accessibility_browsertest_base.cc(403)] Diff:
* Line Expected
- ---- --------
     1 [document web]
     2 ++[section]
     3 ++++[audio]
     4 ++++++[section]
     5 ++++++++[tool bar] name='audio' description='audio' horizontal
     6 ++++++++++[tool bar] name='audio' description='audio' horizontal
     7 ++++++++++++[push button] name='play' xml-roles:button
     8 ++++++++++++[text] name='0:00'
     9 ++++++++++++[text] name='/ 0:00'
    10 ++++++++++++[slider] description='audio time scrubber' horizontal xml-roles:slider
    11 ++++++++++++[section]
    12 ++++++++++++++[section]
*   13 ++++++++++++++[push button] name='mute' xml-roles:button
*   14 <-- End-of-file -->

Actual
------
[document web]
++[section]
++++[audio]
++++++[section]
++++++++[tool bar] name='audio' description='audio' horizontal
++++++++++[tool bar] name='audio' description='audio' horizontal
++++++++++++[push button] name='play' xml-roles:button
++++++++++++[text] name='0:00'
++++++++++++[text] name='/ 0:00'
++++++++++++[slider] description='audio time scrubber' horizontal xml-roles:slider
++++++++++++[section]
++++++++++++++[section]
++++++++++++++[slider] name='volume' horizontal xml-roles:slider
++++++++++++++[push button] name='mute' xml-roles:button
++++++++++++[push button] name='show more media controls' description='more options' xml-roles:button
<-- End-of-file -->
[21250:21302:0118/051851.675115:ERROR:browser_process_sub_thread.cc(209)] Waited 26 ms for network service
[21250:21318:0118/051851.676959:ERROR:process_posix.cc(329)] Unable to terminate process 21323: No such process (3)
[21250:21318:0118/051851.677521:WARNING:internal_linux.cc(64)] Failed to read /proc/21323/stat
[21250:21302:0118/051851.678120:WARNING:discardable_shared_memory_manager.cc(410)] Some MojoDiscardableSharedMemoryManagerImpls are still alive. They will be leaked.
[21250:21554:0118/051851.680520:WARNING:internal_linux.cc(64)] Failed to read /proc/21319/stat
[  FAILED  ] DumpAccessibilityTreeTest.AccessibilityAudio, where TypeParam =  and GetParam() =  (3746 ms)