Running the test on its own won't see the crash, because the process exits before it can crash. But when running all tests it will crash, I narrowed it down to this test by disabling tests and when this one is disabled the crash goes away.

Received signal 11 <unknown> 000000000000
#0 0x7ff5ba43745b base::debug::StackTrace::StackTrace()
#1 0x7ff5ba43615c base::debug::StackTrace::StackTrace()
#2 0x7ff5ba436f6f base::debug::(anonymous namespace)::StackDumpSignalHandler()
#3 0x7ff5bad5a330 <unknown>
#4 0x7ff5b47e2cc6 blink::scheduler::WebThreadBase::TaskObserverAdapter::WillProcessTask()
#5 0x7ff5b47ada69 blink::scheduler::TaskQueueManager::ProcessTaskFromWorkQueue()
#6 0x7ff5b47aaced blink::scheduler::TaskQueueManager::DoWork()
#7 0x7ff5b47b6094 _ZN4base8internal13FunctorTraitsIMN5blink9scheduler16TaskQueueManagerEFvbEvE6InvokeIRKNS_7WeakPtrIS4_EEJRKbEEEvS6_OT_DpOT0_
#8 0x7ff5b47b5f9f _ZN4base8internal12InvokeHelperILb1EvE8MakeItSoIRKMN5blink9scheduler16TaskQueueManagerEFvbERKNS_7WeakPtrIS6_EEJRKbEEEvOT_OT0_DpOT1_
#9 0x7ff5b47b5f13 _ZN4base8internal7InvokerINS0_9BindStateIMN5blink9scheduler16TaskQueueManagerEFvbEJNS_7WeakPtrIS5_EEbEEEFvvEE7RunImplIRKS7_RKSt5tupleIJS9_bEEJLm0ELm1EEEEvOT_OT0_NS_13IndexSequenceIJXspT1_EEEE
#10 0x7ff5b47b5e2c _ZN4base8internal7InvokerINS0_9BindStateIMN5blink9scheduler16TaskQueueManagerEFvbEJNS_7WeakPtrIS5_EEbEEEFvvEE3RunEPNS0_13BindStateBaseE
#11 0x7ff5ba43d96e _ZNO4base8CallbackIFvvELNS_8internal8CopyModeE0ELNS2_10RepeatModeE0EE3RunEv
#12 0x7ff5ba43d0ae base::debug::TaskAnnotator::RunTask()
#13 0x7ff5ba4cf4cd base::MessageLoop::RunTask()
#14 0x7ff5ba4cf754 base::MessageLoop::DeferOrRunPendingTask()
#15 0x7ff5ba4cfa44 base::MessageLoop::DoWork()
#16 0x7ff5ba4e7afc base::MessagePumpGlib::HandleDispatch()
#17 0x7ff5ba4e82a1 base::(anonymous namespace)::WorkSourceDispatch()
#18 0x7ff5a8328e04 g_main_context_dispatch
#19 0x7ff5a8329048 <unknown>
#20 0x7ff5a83290ec g_main_context_iteration
#21 0x7ff5ba4e7bff base::MessagePumpGlib::Run()
#22 0x7ff5ba4cf067 base::MessageLoop::RunHandler()
#23 0x7ff5ba576f0a base::RunLoop::Run()
#24 0x7ff5ba577189 base::RunLoop::RunUntilIdle()
#25 0x00000076abc4 (anonymous namespace)::runHelper()
#26 0x0000006efc2a _ZN4base8internal13FunctorTraitsIPFvPN5blink16FrameTestHelpers18TestWebFrameClientEEvE6InvokeIJS5_EEEvS7_DpOT_
#27 0x00000076b318 _ZN4base8internal12InvokeHelperILb0EiE8MakeItSoIRKPFiPNS_9TestSuiteEEJS5_EEEiOT_DpOT0_
#28 0x00000076b2d7 _ZN4base8internal7InvokerINS0_9BindStateIPFiPNS_9TestSuiteEEJNS0_17UnretainedWrapperIS3_EEEEEFivEE7RunImplIRKS6_RKSt5tupleIJS8_EEJLm0EEEEiOT_OT0_NS_13IndexSequenceIJXspT1_EEEE
#29 0x00000076b21c _ZN4base8internal7InvokerINS0_9BindStateIPFiPNS_9TestSuiteEEJNS0_17UnretainedWrapperIS3_EEEEEFivEE3RunEPNS0_13BindStateBaseE
#30 0x000000bf01fd _ZNKR4base8CallbackIFvvELNS_8internal8CopyModeE1ELNS2_10RepeatModeE1EE3RunEv
#31 0x000001b83226 base::(anonymous namespace)::LaunchUnitTestsInternal()
#32 0x000001b83094 base::LaunchUnitTests()
#33 0x00000076aaa4 main
#34 0x7ff5a860af45 __libc_start_main
#35 0x000000653be4 <unknown>
  r8: 0000000000000000  r9: 00007fff68d9eff0 r10: fffffffffffffe20 r11: 00007ff5a8772cf0
 r12: 00000c3a2e1bdb60 r13: 0000000000000000 r14: 00007ff5ba4e8280 r15: 00000c3a2e87dd40
  di: 0000079303bc2908  si: 2c2c2c2c2c2c2c2c  bp: 00007fff68d9f930  bx: 0000000000000000
  dx: 830fe1f653ccf500  ax: 00000c3a2ead5890  cx: 00007ff5b47e2ca0  sp: 00007fff68d9f910
  ip: 00007ff5b47e2cc6 efl: 0000000000010202 cgf: 0000000000000033 erf: 0000000000000000
 trp: 000000000000000d msk: 0000000000000000 cr2: 0000000000000000
[end of stack trace]