For example, see https://uberchromegw.corp.google.com/i/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%281%29/builds/36688

Stack traces look like:

BrowserTestBase received signal: Terminated. Backtrace:
#0 0x000003076b57 base::debug::StackTrace::StackTrace()
#1 0x0000035f67b6 content::(anonymous namespace)::DumpStackTraceSignalHandler()
#2 0x7f8968a2fcb0 <unknown>
#3 0x7f8968ae984d __poll
#4 0x7f896cc44fe4 <unknown>
#5 0x7f896cc450ec g_main_context_iteration
#6 0x0000030906d6 base::MessagePumpGlib::Run()
#7 0x00000308e8e8 base::MessageLoop::RunHandler()
#8 0x0000030ae18e base::RunLoop::Run()
#9 0x00000361e3ca content::RunMessageLoop()
#10 0x000006ce6cc3 ExtensionTestMessageListener::WaitUntilSatisfied()
#11 0x00000067ddc4 WebViewTestBase::TestHelper()
#12 0x0000006855d1 WebViewTest_Shim_TestNestedSubframes_Test::RunTestOnMainThread()
#13 0x00000312c907 InProcessBrowserTest::RunTestOnMainThreadLoop()
#14 0x0000035f6533 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
#15 0x0000031665d3 ChromeBrowserMainParts::PreMainMessageLoopRunImpl()
#16 0x0000031656eb ChromeBrowserMainParts::PreMainMessageLoopRun()
#17 0x0000018f1fbf chromeos::ChromeBrowserMainPartsChromeos::PreMainMessageLoopRun()
#18 0x000001fb517f content::BrowserMainLoop::PreMainMessageLoopRun()
#19 0x0000022711b7 content::StartupTaskRunner::RunAllTasksNow()
#20 0x000001fb3455 content::BrowserMainLoop::CreateStartupTasks()
#21 0x000001fb7864 content::BrowserMainRunnerImpl::Initialize()
#22 0x000001fb0c02 content::BrowserMain()
#23 0x00000304b58c content::ContentMainRunnerImpl::Run()
#24 0x00000495edaf service_manager::Main()
#25 0x00000304a632 content::ContentMain()
#26 0x0000035f5e8a content::BrowserTestBase::SetUp()
#27 0x00000312afde InProcessBrowserTest::SetUp()
#28 0x000003bf92ee testing::Test::Run()
#29 0x000003bf9e30 testing::TestInfo::Run()
#30 0x000003bfa357 testing::TestCase::Run()
#31 0x000003c01397 testing::internal::UnitTestImpl::RunAllTests()
#32 0x000003c01017 testing::UnitTest::Run()
#33 0x00000313e011 base::TestSuite::Run()
#34 0x00000306c83b ChromeTestSuiteRunner::RunTestSuite()
#35 0x00000361b477 content::LaunchTests()
#36 0x00000306aaf1 main
#37 0x7f8968a1af45 __libc_start_main
#38 0x0000006485dd <unknown>

wjmaclean@, can you take a peek? Possibly related to issue 674904.