It happened deterministically yesterday, but I cannot today (just one reproduction I could make).

What I was doing yesterday is
1. run run-blink-httpd to launch layout test servers
2. open a debug build chromium
3. open chrome://serviceworker-internals and check the "Open DevTools window and ..." check box.
4. open some simple layout test which registers a ServiceWorker


[5239:5239:0818/155203:FATAL:worker_devtools_agent_host.cc(74)] Check failed: state_ == WORKER_UNINSPECTED.
#0 0x7fd84e8913de base::debug::StackTrace::StackTrace()
#1 0x7fd84e8f78df logging::LogMessage::~LogMessage()
#2 0x7fd84855f57b content::WorkerDevToolsAgentHost::PauseForDebugOnStart()
#3 0x7fd8485507e7 content::ServiceWorkerDevToolsManager::WorkerCreated()
#4 0x7fd848c7c878 content::(anonymous namespace)::RegisterToWorkerDevToolsManagerOnUI()
#5 0x7fd848c82957 _ZN4base8internal13FunctorTraitsIPFviPKN7content24ServiceWorkerContextCoreERKNS_7WeakPtrIS3_EElRK4GURLSC_bRKNS_8CallbackIFvibELNS0_8CopyModeE1EEEEvE6InvokeIJRKiRKPS3_S9_RKlSC_SC_RKbSI_EEEvSK_DpOT_
#6 0x7fd848c8272b _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoIRKPFviPKN7content24ServiceWorkerContextCoreERKNS_7WeakPtrIS5_EElRK4GURLSE_bRKNS_8CallbackIFvibELNS0_8CopyModeE1EEEEJRKiRKPS5_SB_RKlSE_SE_RKbSK_EEEvOT_DpOT0_
#7 0x7fd848c82634 _ZN4base8internal7InvokerINS0_9BindStateIPFviPKN7content24ServiceWorkerContextCoreERKNS_7WeakPtrIS4_EElRK4GURLSD_bRKNS_8CallbackIFvibELNS0_8CopyModeE1EEEEJiPS4_S8_lSB_SB_bSH_EEEFvvEE7RunImplIRKSL_RKSt5tupleIJiSM_S8_lSB_SB_bSH_EEJLm0ELm1ELm2ELm3ELm4ELm5ELm6ELm7EEEEvOT_OT0_NS_13IndexSequenceIJXspT1_EEEE
#8 0x7fd848c81cfc _ZN4base8internal7InvokerINS0_9BindStateIPFviPKN7content24ServiceWorkerContextCoreERKNS_7WeakPtrIS4_EElRK4GURLSD_bRKNS_8CallbackIFvibELNS0_8CopyModeE1EEEEJiPS4_S8_lSB_SB_bSH_EEEFvvEE3RunEPNS0_13BindStateBaseE
#9 0x7fd84e8632ce base::Callback<>::Run()
#10 0x7fd84e896cdb base::debug::TaskAnnotator::RunTask()
#11 0x7fd84e91555c base::MessageLoop::RunTask()
#12 0x7fd84e9157f4 base::MessageLoop::DeferOrRunPendingTask()
#13 0x7fd84e915abe base::MessageLoop::DoWork()
#14 0x7fd84e92d996 base::MessagePumpGlib::Run()
#15 0x7fd84e914f3f base::MessageLoop::RunHandler()
#16 0x7fd84e9ba444 base::RunLoop::Run()
#17 0x7fd850b2216f ChromeBrowserMainParts::MainMessageLoopRun()
#18 0x7fd8483ec129 content::BrowserMainLoop::RunMainMessageLoopParts()
#19 0x7fd8483f6665 content::BrowserMainRunnerImpl::Run()
#20 0x7fd8483e5d08 content::BrowserMain()
#21 0x7fd849feb7d6 content::RunNamedProcessTypeMain()
#22 0x7fd849fedac2 content::ContentMainRunnerImpl::Run()
#23 0x7fd849fea892 content::ContentMain()
#24 0x7fd84f4b7bf2 ChromeMain
#25 0x7fd84f4b7ba2 main
#26 0x7fd83988df45 __libc_start_main
#27 0x7fd84f4b7aa5 <unknown>

zsh: abort (core dumped)  out/Debug/chrome --ignore-certificate-errors