Stack trace:
https://ci.chromium.org/p/chromium/builders/luci.chromium.try/mac_chromium_rel_ng/196895

BrowserTestBase received signal: Segmentation fault: 11. Backtrace:
0   headless_browsertests               0x00000001081b289f base::debug::StackTrace::StackTrace(unsigned long) + 31
1   headless_browsertests               0x00000001081d9b75 content::(anonymous namespace)::DumpStackTraceSignalHandler(int) + 229
2   libsystem_platform.dylib            0x00007fff5450cf5a _sigtramp + 26
3   libsystem_malloc.dylib              0x00007fff543bf256 free_tiny + 628
4   headless_browsertests               0x00000001090c50d5 mojo::InterfaceEndpointClient::HandleValidatedMessage(mojo::Message*) + 1285
5   headless_browsertests               0x00000001090c4856 mojo::FilterChain::Accept(mojo::Message*) + 150
6   headless_browsertests               0x00000001090c6385 mojo::InterfaceEndpointClient::HandleIncomingMessage(mojo::Message*) + 117
7   headless_browsertests               0x00000001090cca1b mojo::internal::MultiplexRouter::ProcessIncomingMessage(mojo::internal::MultiplexRouter::MessageWrapper*, mojo::internal::MultiplexRouter::ClientCallBehavior, base::SequencedTaskRunner*) + 1451
8   headless_browsertests               0x00000001090cbe89 mojo::internal::MultiplexRouter::Accept(mojo::Message*) + 377
9   headless_browsertests               0x00000001090c4856 mojo::FilterChain::Accept(mojo::Message*) + 150
10  headless_browsertests               0x00000001090bf7a0 mojo::Connector::ReadSingleMessage(unsigned int*) + 576
11  headless_browsertests               0x00000001090c0331 mojo::Connector::ReadAllAvailableMessages() + 97
12  headless_browsertests               0x00000001090c01e9 mojo::Connector::OnHandleReadyInternal(unsigned int) + 137
13  headless_browsertests               0x000000010678aea7 mojo::SimpleWatcher::DiscardReadyState(base::RepeatingCallback<void (unsigned int)> const&, unsigned int, mojo::HandleSignalsState const&) + 103
14  headless_browsertests               0x00000001090e822d mojo::SimpleWatcher::OnHandleReady(int, unsigned int, mojo::HandleSignalsState const&) + 365
15  headless_browsertests               0x00000001090e8751 void base::internal::Invoker<base::internal::BindState<void (mojo::SimpleWatcher::*)(int, unsigned int, mojo::HandleSignalsState const&), base::WeakPtr<mojo::SimpleWatcher>, int, unsigned int, mojo::HandleSignalsState>, void ()>::RunImpl<void (mojo::SimpleWatcher::* const&)(int, unsigned int, mojo::HandleSignalsState const&), std::__1::tuple<base::WeakPtr<mojo::SimpleWatcher>, int, unsigned int, mojo::HandleSignalsState> const&, 0ul, 1ul, 2ul, 3ul>(void (mojo::SimpleWatcher::* const&&&)(int, unsigned int, mojo::HandleSignalsState const&), std::__1::tuple<base::WeakPtr<mojo::SimpleWatcher>, int, unsigned int, mojo::HandleSignalsState> const&&&, std::__1::integer_sequence<unsigned long, 0ul, 1ul, 2ul, 3ul>) + 193
16  headless_browsertests               0x000000010809c141 base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) + 305
17  headless_browsertests               0x00000001080cc280 base::MessageLoopImpl::RunTask(base::PendingTask*) + 272
18  headless_browsertests               0x00000001080cc8f3 base::MessageLoopImpl::DoWork() + 387
19  headless_browsertests               0x00000001080ce98a base::MessagePumpCFRunLoopBase::RunWork() + 42
20  headless_browsertests               0x00000001080b526a base::mac::CallWithEHFrame(void () block_pointer) + 10
21  headless_browsertests               0x00000001080ce2af base::MessagePumpCFRunLoopBase::RunWorkSource(void*) + 63
22  CoreFoundation                      0x00007fff2c32fd31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
23  CoreFoundation                      0x00007fff2c3e760c __CFRunLoopDoSource0 + 108
24  CoreFoundation                      0x00007fff2c312ce0 __CFRunLoopDoSources0 + 208
25  CoreFoundation                      0x00007fff2c31215d __CFRunLoopRun + 1293
26  CoreFoundation                      0x00007fff2c3119b7 CFRunLoopRunSpecific + 487
27  HIToolbox                           0x00007fff2b5f1d96 RunCurrentEventLoopInMode + 286
28  HIToolbox                           0x00007fff2b5f1b06 ReceiveNextEventCommon + 613
29  HIToolbox                           0x00007fff2b5f1884 _BlockUntilNextEventMatchingListInModeWithFilter + 64
30  AppKit                              0x00007fff298a2a73 _DPSNextEvent + 2085
31  AppKit                              0x00007fff2a038e34 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 3044
32  headless_browsertests               0x00000001080cf9f0 base::MessagePumpNSApplication::DoRun(base::MessagePump::Delegate*) + 288
33  headless_browsertests               0x00000001080cdce7 base::MessagePumpCFRunLoopBase::Run(base::MessagePump::Delegate*) + 119
34  headless_browsertests               0x00000001080cbe28 base::MessageLoopImpl::Run(bool) + 136
35  headless_browsertests               0x0000000108107059 base::RunLoop::Run() + 249
36  headless_browsertests               0x00000001047675de headless::HeadlessBrowserTest::RunAsynchronousTest() + 318
37  headless_browsertests               0x0000000104767c3a headless::HeadlessAsyncDevTooledBrowserTest::RunTest() + 458
38  headless_browsertests               0x00000001081d8f68 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop() + 584
39  headless_browsertests               0x000000010809c141 base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) + 305
40  headless_browsertests               0x00000001080cc280 base::MessageLoopImpl::RunTask(base::PendingTask*) + 272
41  headless_browsertests               0x00000001080cc8f3 base::MessageLoopImpl::DoWork() + 387
42  headless_browsertests               0x00000001080ce98a base::MessagePumpCFRunLoopBase::RunWork() + 42
43  headless_browsertests               0x00000001080b526a base::mac::CallWithEHFrame(void () block_pointer) + 10
44  headless_browsertests               0x00000001080ce2af base::MessagePumpCFRunLoopBase::RunWorkSource(void*) + 63
45  CoreFoundation                      0x00007fff2c32fd31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
46  CoreFoundation                      0x00007fff2c3e760c __CFRunLoopDoSource0 + 108
47  CoreFoundation                      0x00007fff2c312ce0 __CFRunLoopDoSources0 + 208
48  CoreFoundation                      0x00007fff2c31215d __CFRunLoopRun + 1293
49  CoreFoundation                      0x00007fff2c3119b7 CFRunLoopRunSpecific + 487
50  HIToolbox                           0x00007fff2b5f1d96 RunCurrentEventLoopInMode + 286
51  HIToolbox                           0x00007fff2b5f1b06 ReceiveNextEventCommon + 613
52  HIToolbox                           0x00007fff2b5f1884 _BlockUntilNextEventMatchingListInModeWithFilter + 64
53  AppKit                              0x00007fff298a2a73 _DPSNextEvent + 2085
54  AppKit                              0x00007fff2a038e34 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 3044
55  AppKit                              0x00007fff29897885 -[NSApplication run] + 764
56  headless_browsertests               0x00000001080cfa3c base::MessagePumpNSApplication::DoRun(base::MessagePump::Delegate*) + 364
57  headless_browsertests               0x00000001080cdce7 base::MessagePumpCFRunLoopBase::Run(base::MessagePump::Delegate*) + 119
58  headless_browsertests               0x00000001080cbe28 base::MessageLoopImpl::Run(bool) + 136
59  headless_browsertests               0x0000000108107059 base::RunLoop::Run() + 249
60  headless_browsertests               0x0000000106d4ea2d content::BrowserMainLoop::MainMessageLoopRun() + 461
61  headless_browsertests               0x0000000106d4e790 content::BrowserMainLoop::RunMainMessageLoopParts() + 64
62  headless_browsertests               0x0000000106d51436 content::BrowserMainRunnerImpl::Run() + 102
63  headless_browsertests               0x000000010808a8b9 headless::HeadlessContentMainDelegate::RunProcess(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, content::MainFunctionParams const&) + 393
64  headless_browsertests               0x0000000107cf2816 content::ContentMainRunnerImpl::RunServiceManager(content::MainFunctionParams&, bool) + 230
65  headless_browsertests               0x0000000107cf2700 content::ContentMainRunnerImpl::Run(bool) + 464
66  headless_browsertests               0x000000010a79262e service_manager::Main(service_manager::MainParams const&) + 3166
67  headless_browsertests               0x0000000107ce3974 content::ContentMain(content::ContentMainParams const&) + 68
68  headless_browsertests               0x00000001081d8b29 content::BrowserTestBase::SetUp() + 3609
69  headless_browsertests               0x0000000104766daa headless::HeadlessBrowserTest::SetUp() + 202
70  headless_browsertests               0x0000000107cccf60 testing::Test::Run() + 112
71  headless_browsertests               0x0000000107ccdeaf testing::TestInfo::Run() + 463
72  headless_browsertests               0x0000000107cce4f7 testing::TestCase::Run() + 247
73  headless_browsertests               0x0000000107cdbac7 testing::internal::UnitTestImpl::RunAllTests() + 855
74  headless_browsertests               0x0000000107cdb74d testing::UnitTest::Run() + 109
75  headless_browsertests               0x000000010cf7bd56 base::TestSuite::Run() + 166
76  headless_browsertests               0x0000000104784937 headless::(anonymous namespace)::HeadlessTestLauncherDelegate::RunTestSuite(int, char**) + 39
77  headless_browsertests               0x00000001081eef6e content::LaunchTests(content::TestLauncherDelegate*, unsigned long, int, char**) + 622
78  headless_browsertests               0x00000001047848cf main + 319
79  libdyld.dylib                       0x00007fff541fe015 start + 1
80  ???                                 0x0000000000000009 0x0 + 9

 Issue 910189  has been merged into this issue.

 Issue 910188  has been merged into this issue.

 Issue 910186  has been merged into this issue.

 Issue 910187  has been merged into this issue.

 Issue 910185  has been merged into this issue.

 Issue 910184  has been merged into this issue.

 Issue 910183  has been merged into this issue.

 Issue 910182  has been merged into this issue.

All the failures (on this and all merged issues) occur on the three runs:

https://ci.chromium.org/p/chromium/builders/luci.chromium.try/mac_chromium_rel_ng/196482
https://ci.chromium.org/p/chromium/builders/luci.chromium.try/mac_chromium_rel_ng/196639
https://ci.chromium.org/p/chromium/builders/luci.chromium.try/mac_chromium_rel_ng/196895

And all of them ran on "vm291-m4".
Something wrong in "vm291-m4" bot?

 Issue 910180  has been merged into this issue.

 Issue 910179  has been merged into this issue.

 Issue 910178  has been merged into this issue.

 Issue 910177  has been merged into this issue.

 Issue 910176  has been merged into this issue.

 Issue 910175  has been merged into this issue.

 Issue 910174  has been merged into this issue.

 Issue 910173  has been merged into this issue.

 Issue 910170  has been merged into this issue.

 Issue 910169  has been merged into this issue.

 Issue 910168  has been merged into this issue.

 Issue 910167  has been merged into this issue.

 Issue 910166  has been merged into this issue.

 Issue 910165  has been merged into this issue.

 Issue 910162  has been merged into this issue.

 Issue 910163  has been merged into this issue.

 Issue 910164  has been merged into this issue.

 Issue 910171  has been merged into this issue.

 Issue 910172  has been merged into this issue.

 Issue 910181  has been merged into this issue.

 Issue 910448  has been merged into this issue.

Bot looks better now. I clobbered it just to be safe.

If it starts acting up again, we can always reimage the VM.