Logs: https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.linux%2FLinux_Tests%2F53910%2F%2B%2Frecipes%2Fsteps%2Fsite_per_process_content_browsertests%2F0%2Flogs%2FTouchAccessibilityBrowserTest.TouchExplorationInCrossSiteIframe%2F0


TouchAccessibilityBrowserTest.TouchExplorationInCrossSiteIframe (run #1):
[ RUN      ] TouchAccessibilityBrowserTest.TouchExplorationInCrossSiteIframe
[15002:15002:0328/135742.262806:11931378001:WARNING:audio_manager.cc(295)] Multiple instances of AudioManager detected
[15002:15002:0328/135742.262877:11931378052:WARNING:audio_manager.cc(254)] Multiple instances of AudioManager detected
Xlib:  extension "RANDR" missing on display ":99".
[15002:15002:0328/135742.520234:11931635414:WARNING:render_frame_host_impl.cc(2325)] OnDidStopLoading was called twice.
[15002:15002:0328/135742.521679:11931636856:WARNING:render_frame_host_impl.cc(2325)] OnDidStopLoading was called twice.
BrowserTestBase received signal: Terminated. Backtrace:
#0 0x000001e54de7 base::debug::StackTrace::StackTrace()
#1 0x000001b77f86 content::(anonymous namespace)::DumpStackTraceSignalHandler()
#2 0x7fea861dfcb0 <unknown>
#3 0x7fea86295fdd __poll
#4 0x7fea8a599fe4 <unknown>
#5 0x7fea8a59a0ec g_main_context_iteration
#6 0x000001e6d5f6 base::MessagePumpGlib::Run()
#7 0x000001e6b7c7 base::MessageLoop::RunHandler()
#8 0x000001e8540e base::RunLoop::Run()
#9 0x000001b8c2e1 content::MessageLoopRunner::Run()
#10 0x000001b8d451 content::AccessibilityNotificationWaiter::WaitForNotification()
#11 0x0000004f36ca content::TouchAccessibilityBrowserTest_TouchExplorationInCrossSiteIframe_Test::RunTestOnMainThread()
#12 0x000001b6f4f6 content::ContentBrowserTest::RunTestOnMainThreadLoop()
#13 0x000001b77ce8 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
#14 0x000001bd06b4 content::ShellBrowserMainParts::PreMainMessageLoopRun()
#15 0x000001720755 content::BrowserMainLoop::PreMainMessageLoopRun()
#16 0x0000019f9046 content::StartupTaskRunner::RunAllTasksNow()
#17 0x00000171e93b content::BrowserMainLoop::CreateStartupTasks()
#18 0x000001723a8c content::BrowserMainRunnerImpl::Initialize()
#19 0x000001bb9795 ShellBrowserMain()
#20 0x000001bb1802 content::ShellMainDelegate::RunProcess()
#21 0x000001670fdc content::RunNamedProcessTypeMain()
#22 0x00000167179c content::ContentMainRunnerImpl::Run()
#23 0x000002936bb5 service_manager::Main()
#24 0x000000d4f0c2 content::ContentMain()
#25 0x000001b77629 content::BrowserTestBase::SetUp()
#26 0x000001b6f3e3 content::ContentBrowserTest::SetUp()
#27 0x000001ce501e testing::Test::Run()
#28 0x000001ce5be0 testing::TestInfo::Run()
#29 0x000001ce5f57 testing::TestCase::Run()
#30 0x000001ced177 testing::internal::UnitTestImpl::RunAllTests()
#31 0x000001cecdf7 testing::UnitTest::Run()
#32 0x000001b95e41 base::TestSuite::Run()
#33 0x000001b72b96 content::ContentTestLauncherDelegate::RunTestSuite()
#34 0x000001b88bea content::LaunchTests()
#35 0x000001b72b43 main
#36 0x7fea861caf45 __libc_start_main
#37 0x0000004c9f2d <unknown>

Suspecting https://chromium.googlesource.com/chromium/src/+/e2da63fad40fc329932c04030bca51f366ed721c

Assigning to kenrb@ for a fix.