Example error:

[ RUN      ] NaClBrowserTestPnaclSubzero.PnaclErrorHandling
Xlib:  extension "RANDR" missing on display ":99".
Xlib:  extension "RANDR" missing on display ":99".
[19942:19942:0317/121310.686595:WARNING:audio_manager.cc(295)] Multiple instances of AudioManager detected
[19942:19942:0317/121310.686627:WARNING:audio_manager.cc(254)] Multiple instances of AudioManager detected
[19942:19942:0317/121310.838671:WARNING:password_store_factory.cc(247)] Using basic (unencrypted) store for password storage. See https://chromium.googlesource.com/chromium/src/+/master/docs/linux_password_storage.md for more information about password storage options.
[19942:19981:0317/121311.303176:WARNING:simple_synchronous_entry.cc(1054)] Could not open platform files for entry.
[19942:19942:0317/121311.448680:INFO:nacl_browsertest_util.cc(130)] |||| [STARTUP]
[19942:19942:0317/121311.478389:INFO:nacl_browsertest_util.cc(130)] ||||
[19942:19942:0317/121311.478741:INFO:nacl_browsertest_util.cc(130)] |||| [bad_pexe BEGIN]
[19942:19998:0317/121311.494552:WARNING:embedded_test_server.cc(219)] Request not handled. Returning 404: /favicon.ico
[1,284108928:19:13:11.552833] Native Client module will be loaded at base address 0x00004a8a00000000
[19942:19942:0317/121311.640531:INFO:CONSOLE(0)] "NativeClient: PnaclCoordinator: Invalid PNaCl bitcode header", source: http://127.0.0.1:51759/pnacl_error_handling.html?pnacl=1 (0)
[19942:19942:0317/121311.654827:INFO:nacl_browsertest_util.cc(130)] |||| [bad_pexe PASS]
[19942:19942:0317/121311.655173:INFO:nacl_browsertest_util.cc(130)] ||||
[19942:19942:0317/121311.663521:INFO:nacl_browsertest_util.cc(130)] |||| [bad_pexe_O0 BEGIN]
[1,284108928:19:13:11.709921] Native Client module will be loaded at base address 0x0000412a00000000
[19942:19942:0317/121311.736475:INFO:CONSOLE(0)] "NativeClient: PnaclCoordinator: Invalid PNaCl bitcode header", source: http://127.0.0.1:51759/pnacl_error_handling.html?pnacl=1 (0)
[19942:19942:0317/121311.747426:INFO:nacl_browsertest_util.cc(130)] |||| [bad_pexe_O0 PASS]
[19942:19942:0317/121311.757351:INFO:nacl_browsertest_util.cc(130)] ||||
[19942:19942:0317/121311.758121:INFO:nacl_browsertest_util.cc(130)] |||| [bad_nonfinal_pexe_O0 BEGIN]
[1,284108928:19:13:11.917122] Native Client module will be loaded at base address 0x00000e5700000000
BrowserTestBase received signal: Terminated. Backtrace:
#0 0x000002e647b7 base::debug::StackTrace::StackTrace()
#1 0x000003555ea6 content::(anonymous namespace)::DumpStackTraceSignalHandler()
#2 0x7f3a3db34cb0 <unknown>
#3 0x7f3a3dbeafdd __poll
#4 0x7f3a43596fe4 <unknown>
#5 0x7f3a435970ec g_main_context_iteration
#6 0x000002e86dd6 base::MessagePumpGlib::Run()
#7 0x000002e844be base::MessageLoop::RunHandler()
#8 0x000002ead26c base::RunLoop::Run()
#9 0x0000035884ec content::RunMessageLoop()
#10 0x0000035634d9 content::JavascriptTestObserver::Run()
#11 0x0000012ea158 NaClBrowserTestBase::RunNaClIntegrationTest()
#12 0x0000012e5d8e (anonymous namespace)::NaClBrowserTestPnacl_PnaclErrorHandling_Test::RunTestOnMainThread()
#13 0x000002f3d00f InProcessBrowserTest::RunTestOnMainThreadLoop()
#14 0x000003555c16 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
#15 0x00000337d2c9 ChromeBrowserMainParts::PreMainMessageLoopRunImpl()
#16 0x00000337c181 ChromeBrowserMainParts::PreMainMessageLoopRun()
#17 0x000001abab35 content::BrowserMainLoop::PreMainMessageLoopRun()
#18 0x000001eab626 content::StartupTaskRunner::RunAllTasksNow()
#19 0x000001ab89cb content::BrowserMainLoop::CreateStartupTasks()
#20 0x000001abe71e content::BrowserMainRunnerImpl::Initialize()
#21 0x000001ab5de8 content::BrowserMain()
#22 0x000002e3ff73 content::RunNamedProcessTypeMain()
#23 0x000002e40c86 content::ContentMainRunnerImpl::Run()
#24 0x000002e3f284 content::ContentMain()
#25 0x000003555520 content::BrowserTestBase::SetUp()
#26 0x000002f3b651 InProcessBrowserTest::SetUp()
#27 0x000003d2a39e testing::Test::Run()
#28 0x000003d2af60 testing::TestInfo::Run()
#29 0x000003d2b2d7 testing::TestCase::Run()
#30 0x000003d32527 testing::internal::UnitTestImpl::RunAllTests()
#31 0x000003d321a7 testing::UnitTest::Run()
#32 0x000002f4e7b1 base::TestSuite::Run()
#33 0x000002e54cc8 ChromeTestSuiteRunner::RunTestSuite()
#34 0x00000358501c content::LaunchTests()
#35 0x000002e54c47 main
#36 0x7f3a3db1ff45 __libc_start_main
#37 0x000000604151 <unknown>

This test always fails in concert with MediaFileValidatorTest.UnsupportedExtension, which may be useful information for tracking down the underlying cause.

MediaFileValidatorTest.UnsupportedExtension was disabled in  bug 704614 .

I don't see an obvious change that would lead this to flake. Assigning bug based on OWNER information.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/44b664eb0800e5367ebb927691fb4a213957e1f6

commit 44b664eb0800e5367ebb927691fb4a213957e1f6
Author: wittman <wittman@chromium.org>
Date: Fri Mar 24 19:12:45 2017

Disable NaClBrowserTestPnaclSubzero.PnaclErrorHandling on Linux

Flaky on linux_chromium_rel_ng.

TBR=mseaborn
BUG=704980

Review-Url: https://codereview.chromium.org/2773793003
Cr-Commit-Position: refs/heads/master@{#459509}

[modify] https://crrev.com/44b664eb0800e5367ebb927691fb4a213957e1f6/chrome/test/nacl/nacl_browsertest.cc

The previous CL actually disabled the NaClBrowserTestPnacl.PnaclErrorHandling test (oops), but this was flaky also under  bug 704979 , so no harm done.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/369b8f475926bbf246b569ffb7d6236b7946f209

commit 369b8f475926bbf246b569ffb7d6236b7946f209
Author: wittman <wittman@chromium.org>
Date: Fri Mar 24 21:44:43 2017

Disable NaClBrowserTestPnaclSubzero.PnaclErrorHandling on Linux for real

Flaky on linux_chromium_rel_ng.

TBR=mseaborn@chromium.org
BUG=704980

Review-Url: https://codereview.chromium.org/2769333005
Cr-Commit-Position: refs/heads/master@{#459563}

[modify] https://crrev.com/369b8f475926bbf246b569ffb7d6236b7946f209/chrome/test/nacl/nacl_browsertest.cc

 Issue 704979  has been merged into this issue.

Detected 5 new flakes for test/step "NaClBrowserTestPnaclSubzero.PnaclErrorHandling". To see the actual flakes, please visit https://chromium-try-flakes.appspot.com/all_flake_occurrences?key=ahVzfmNocm9taXVtLXRyeS1mbGFrZXNyOQsSBUZsYWtlIi5OYUNsQnJvd3NlclRlc3RQbmFjbFN1Ynplcm8uUG5hY2xFcnJvckhhbmRsaW5nDA. This message was posted automatically by the chromium-try-flakes app. Since flakiness is ongoing, the issue was moved back into Sheriff Bug Queue (unless already there).

 Issue 870309  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4fff9d396231ba4b38a77a237717e8e625f7a1d6

commit 4fff9d396231ba4b38a77a237717e8e625f7a1d6
Author: Balazs Engedy <engedy@chromium.org>
Date: Mon Aug 06 15:24:46 2018

Disable NaClBrowserTestPnacl.PnaclErrorHandling on Mac.

The test is flaky on Mac as well.

Bug: 704980
Change-Id: I6d56312bd8ffb8fffe6911535a0029d95a27812a
TBR: mseaborn@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/1163676
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580874}
[modify] https://crrev.com/4fff9d396231ba4b38a77a237717e8e625f7a1d6/chrome/test/nacl/nacl_browsertest.cc