Started here:

https://luci-milo.appspot.com/buildbot/chromium.fyi/Mojo%20Linux/2236

[1834/1834] RenderProcessHostTest.KillProcessZerosAudioStreams (TIMED OUT)
Retrying 1 test (retry #3)
Still waiting for the following processes to finish:
	./content_browsertests --brave-new-test-launcher --data-path=/b/s/w/itq0LAy_/.org.chromium.Chromium.7TKavh/dhzDS3X --enable-network-service --gtest_also_run_disabled_tests --gtest_filter=RenderProcessHostTest.KillProcessZerosAudioStreams --single_process --test-launcher-bot-mode --test-launcher-filter-file=../../testing/buildbot/filters/mojo.fyi.network_content_browsertests.filter --test-launcher-summary-output=/b/s/w/io32KTS8/output.json --use-fake-device-for-media-stream
Still waiting for the following processes to finish:
	./content_browsertests --brave-new-test-launcher --data-path=/b/s/w/itq0LAy_/.org.chromium.Chromium.7TKavh/dhzDS3X --enable-network-service --gtest_also_run_disabled_tests --gtest_filter=RenderProcessHostTest.KillProcessZerosAudioStreams --single_process --test-launcher-bot-mode --test-launcher-filter-file=../../testing/buildbot/filters/mojo.fyi.network_content_browsertests.filter --test-launcher-summary-output=/b/s/w/io32KTS8/output.json --use-fake-device-for-media-stream
[ RUN      ] RenderProcessHostTest.KillProcessZerosAudioStreams
Xlib:  extension "RANDR" missing on display ":99".
Received signal 11 SEGV_MAPERR fffffffffffffb2f
#0 0x000001e8e7d7 base::debug::StackTrace::StackTrace()
#1 0x000001e8e34f base::debug::(anonymous namespace)::StackDumpSignalHandler()
#2 0x7f7eb051b330 <unknown>
#3 0x000002bf1654 content::URLResponseBodyConsumer::OnComplete()
#4 0x000002beaedb content::ResourceDispatcher::ContinueForNavigation()
#5 0x000002beb161 _ZN4base8internal7InvokerINS0_9BindStateIMN7content18ResourceDispatcherEFviN4mojo16ScopedHandleBaseINS5_22DataPipeConsumerHandleEEEEJNS_7WeakPtrIS4_EEiNS0_13PassedWrapperIS8_EEEEEFvvEE7RunImplIRKSA_RKSt5tupleIJSC_iSE_EEJLm0ELm1ELm2EEEEvOT_OT0_NS_13IndexSequenceIJXspT1_EEEE
#6 0x000001f0cb90 base::debug::TaskAnnotator::RunTask()
#7 0x000002f086b8 blink::scheduler::TaskQueueManager::ProcessTaskFromWorkQueue()
#8 0x000002f06b1f blink::scheduler::TaskQueueManager::DoWork()
#9 0x000001f0cb90 base::debug::TaskAnnotator::RunTask()
#10 0x000001ea5afd base::MessageLoop::RunTask()
#11 0x000001ea5e48 base::MessageLoop::DeferOrRunPendingTask()
#12 0x000001ea6221 base::MessageLoop::DoWork()
#13 0x000001ea711a base::MessagePumpDefault::Run()
#14 0x000001ebfb8e base::RunLoop::Run()
#15 0x000003834b7c content::RendererMain()
#16 0x00000163e54a content::RunZygote()
#17 0x00000163f3d8 content::ContentMainRunnerImpl::Run()
#18 0x000002bb0381 service_manager::Main()
#19 0x000000de6d12 content::ContentMain()
#20 0x000001bd5b88 content::LaunchTests()
#21 0x000001bbd423 main
#22 0x7f7eab615f45 __libc_start_main
#23 0x0000004d0acd <unknown>
  r8: 0000000000000003  r9: 000000000000430e r10: 00000000ccccd22b r11: 000000000fccfebd
 r12: 00007ffcfce4a358 r13: 00007ffcfce4a558 r14: 000025a0c222d630 r15: 00007ffcfce4a0f8
  di: fffffffffffffa86  si: 00007ffcfce4a0f8  bp: 000025a0c24441d0  bx: fffffffffffffa86
  dx: 0000000000040b84  ax: 00007ffcfce4a0f8  cx: 00000003ff306b04  sp: 00007ffcfce4a020
  ip: 0000000002bf1654 efl: 0000000000010206 cgf: 0000000000000033 erf: 0000000000000005
 trp: 000000000000000e msk: 0000000000000000 cr2: fffffffffffffb2f
[end of stack trace]
Calling _exit(1). Core file will not be generated.
BrowserTestBase received signal: Terminated. Backtrace:
#0 0x000001e8e7d7 base::debug::StackTrace::StackTrace()
#1 0x000001bc32b6 content::(anonymous namespace)::DumpStackTraceSignalHandler()
#2 0x7f3775e8bcb0 <unknown>
#3 0x7f3775f4584d __poll
#4 0x7f377a24bfe4 <unknown>
#5 0x7f377a24c0ec g_main_context_iteration
#6 0x000001ea7446 base::MessagePumpGlib::Run()
#7 0x000001ebfb8e base::RunLoop::Run()
#8 0x000000872d87 content::(anonymous namespace)::RenderProcessHostTest_KillProcessZerosAudioStreams_Test::RunTestOnMainThread()
#9 0x000001bc3001 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
#10 0x000001c1e645 content::ShellBrowserMainParts::PreMainMessageLoopRun()
#11 0x0000016f425d content::BrowserMainLoop::PreMainMessageLoopRun()
#12 0x0000019f2f27 content::StartupTaskRunner::RunAllTasksNow()
#13 0x0000016f2788 content::BrowserMainLoop::CreateStartupTasks()
#14 0x0000016f6ae0 content::BrowserMainRunnerImpl::Initialize()
#15 0x000001c05c25 ShellBrowserMain()
#16 0x000001bff602 content::ShellMainDelegate::RunProcess()
#17 0x00000163eb3c content::RunNamedProcessTypeMain()
#18 0x00000163f3d8 content::ContentMainRunnerImpl::Run()
#19 0x000002bb0381 service_manager::Main()
#20 0x000000de6d12 content::ContentMain()
#21 0x000001bc2989 content::BrowserTestBase::SetUp()
#22 0x000001bb9e03 content::ContentBrowserTest::SetUp()
#23 0x000001b3210e testing::Test::Run()
#24 0x000001b32bc0 testing::TestInfo::Run()
#25 0x000001b330e7 testing::TestCase::Run()
#26 0x000001b3a157 testing::internal::UnitTestImpl::RunAllTests()
#27 0x000001b39de7 testing::UnitTest::Run()
#28 0x000001be3681 base::TestSuite::Run()
#29 0x000001bbd476 content::ContentTestLauncherDelegate::RunTestSuite()
#30 0x000001bd5b1a content::LaunchTests()
#31 0x000001bbd423 main
#32 0x7f3775e76f45 __libc_start_main
#33 0x0000004d0acd <unknown>
[1835/1835] RenderProcessHostTest.KillProcessZerosAudioStreams (TIMED OUT)
1 test timed out:
    RenderProcessHostTest.KillProcessZerosAudioStreams (../../content/browser/renderer_host/render_process_host_browsertest.cc:273)


Could this be https://chromium.googlesource.com/chromium/src/+/84047549ac37bab70d7306566c912e59131f3e1f?

(No need to revert, this is only the FYI bot)