mash_browser_tests (browser_tests --mash) started crashing around https://ci.chromium.org/buildbot/chromium.fyi/Mojo%20ChromiumOS/26694

I don't see any obvious culprit CLs. Maybe danakj's https://chromium.googlesource.com/chromium/src/+/bd63605c0b5cbcd45dd8320143b2d511f3112995 ?

[24651:24722:0207/093620.315899:ERROR:crash_handler_host_linux.cc(437)] Failed to write crash dump for pid 24995
Cannot upload crash dump: failed to open
Failed to save crash dump: failed to open
BrowserTestBase received signal: Segmentation fault. Backtrace:
#0 0x000003ec0c3c base::debug::StackTrace::StackTrace()
#1 0x000004512282 content::(anonymous namespace)::DumpStackTraceSignalHandler()
#2 0x7f321a945cb0 <unknown>
#3 0x000005c01331 cc::(anonymous namespace)::ZeroCopyGpuBacking::SharedMemoryGuid()
#4 0x000005c09b3a cc::ResourcePool::PoolResource::OnMemoryDump()
#5 0x000005c098c6 cc::ResourcePool::OnMemoryDump()
#6 0x000003f43553 base::trace_event::MemoryDumpManager::InvokeOnMemoryDump()
#7 0x000003f43112 base::trace_event::MemoryDumpManager::ContinueAsyncProcessDump()
#8 0x000003ec13f5 base::debug::TaskAnnotator::RunTask()
#9 0x000003f79329 base::internal::IncomingTaskQueue::RunTask()
#10 0x000003ee280b base::MessageLoop::RunTask()
#11 0x000003ee2ba3 base::MessageLoop::DeferOrRunPendingTask()
#12 0x000003ee2e36 base::MessageLoop::DoWork()
#13 0x000003ee4ef9 base::MessagePumpLibevent::Run()
#14 0x000003ee2109 base::MessageLoop::Run()
#15 0x000003f0d3a9 base::RunLoop::Run()
#16 0x00000454b186 content::MessageLoopRunner::Run()
#17 0x000004549af9 content::TestNavigationObserver::Wait()
#18 0x000003fb035c ui_test_utils::NavigateToURLWithDispositionBlockUntilNavigationsComplete()
#19 0x000000e7972e (anonymous namespace)::MemoryTracingBrowserTest::PerformDumpMemoryTestActions()
#20 0x000000e7a5a6 (anonymous namespace)::MemoryTracingBrowserTest_TestHeapProfilingPseudo_Test::RunTestOnMainThread()
#21 0x000004511fd5 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
#22 0x000003ff476c ChromeBrowserMainParts::PreMainMessageLoopRunImpl()
#23 0x000003ff350d ChromeBrowserMainParts::PreMainMessageLoopRun()
#24 0x000001995a38 chromeos::ChromeBrowserMainPartsChromeos::PreMainMessageLoopRun()
#25 0x000002749f01 content::BrowserMainLoop::PreMainMessageLoopRun()
#26 0x000002b89115 content::StartupTaskRunner::RunAllTasksNow()
#27 0x0000027484bd content::BrowserMainLoop::CreateStartupTasks()
#28 0x00000274c9d3 content::BrowserMainRunnerImpl::Initialize()
#29 0x000002746092 content::BrowserMain()
#30 0x000003e8d9c2 content::ContentMainRunnerImpl::Run()
#31 0x00000618579b service_manager::Main()
#32 0x000003e8bfa4 content::ContentMain()
#33 0x000004511c3f content::BrowserTestBase::SetUp()
#34 0x000003fad1ec InProcessBrowserTest::SetUp()
#35 0x000001d16951 testing::Test::Run()
#36 0x000001d17520 testing::TestInfo::Run()
#37 0x000001d17a07 testing::TestCase::Run()
#38 0x000001d1ef37 testing::internal::UnitTestImpl::RunAllTests()
#39 0x000001d1eb87 testing::UnitTest::Run()
#40 0x000003fc1842 base::TestSuite::Run()
#41 0x000003eb4af9 ChromeTestSuiteRunner::RunTestSuite()
#42 0x000003eb4a70 (anonymous namespace)::MusTestLauncherDelegate::RunTestSuite()
#43 0x000004546d6d content::LaunchTests()
#44 0x000003eb4fc4 LaunchChromeTests()
#45 0x000003eb4806 RunMashBrowserTests()
#46 0x000003eb46b7 main