STR:

1. set dom.disable_open_during_load=false
2. set dom.allow_scripts_to_close_windows=true
3. serve testcase.html via http sever

Assertion failure: !mHadOriginalOpener (Probably too late to call ComputeIsSecureContext again), at src/dom/base/nsGlobalWindowOuter.cpp:2547

rax = 0x000056150bf31e40   rdx = 0x0000000000000000
rcx = 0x00007fb4c7644a69   rbx = 0x00007fb4b9acb2e0
rsi = 0x00007fb4d28aa8b0   rdi = 0x00007fb4d28a9680
rbp = 0x00007fff5b6f9b40   rsp = 0x00007fff5b6f9ae0
r8 = 0x00007fb4d28aa8b0    r9 = 0x00007fb4d3a2c740
r10 = 0x0000000000000000   r11 = 0x0000000000000000
r12 = 0x00007fb4b8aba220   r13 = 0x00007fff5b6f9af8
r14 = 0x0000000000000001   r15 = 0x00007fb4b9ab4640
rip = 0x00007fb4c2a2bc05
OS|Linux|0.0.0 Linux 4.19.13-coreos #1 SMP Mon Jan 7 23:51:04 -00 2019 x86_64
CPU|amd64|family 6 model 79 stepping 1|8
GPU|||
Crash|SIGSEGV|0x0|0
0|0|libxul.so|nsGlobalWindowOuter::SetOpenerWindow(nsPIDOMWindowOuter*, bool)|hg:hg.mozilla.org/mozilla-central:dom/base/nsGlobalWindowOuter.cpp:90234f4c094dcc794df28fdd464793dfe065f943|2514|0x3
0|1|libxul.so|nsWindowWatcher::ReadyOpenedDocShellItem(nsIDocShellTreeItem*, nsPIDOMWindowOuter*, bool, bool, mozIDOMWindowProxy**)|hg:hg.mozilla.org/mozilla-central:toolkit/components/windowwatcher/nsWindowWatcher.cpp:90234f4c094dcc794df28fdd464793dfe065f943|2032|0x1b
0|2|libxul.so|nsWindowWatcher::OpenWindowInternal(mozIDOMWindowProxy*, char const*, char const*, char const*, bool, bool, bool, nsIArray*, bool, bool, bool, nsDocShellLoadState*, mozIDOMWindowProxy**)|hg:hg.mozilla.org/mozilla-central:toolkit/components/windowwatcher/nsWindowWatcher.cpp:90234f4c094dcc794df28fdd464793dfe065f943|941|0x20
0|3|libxul.so|nsWindowWatcher::OpenWindow2(mozIDOMWindowProxy*, char const*, char const*, char const*, bool, bool, bool, nsISupports*, bool, bool, bool, nsDocShellLoadState*, mozIDOMWindowProxy**)|hg:hg.mozilla.org/mozilla-central:toolkit/components/windowwatcher/nsWindowWatcher.cpp:90234f4c094dcc794df28fdd464793dfe065f943|372|0xa
0|4|libxul.so|nsGlobalWindowOuter::OpenInternal(nsTSubstring<char16_t> const&, nsTSubstring<char16_t> const&, nsTSubstring<char16_t> const&, bool, bool, bool, bool, bool, nsIArray*, nsISupports*, nsDocShellLoadState*, bool, nsPIDOMWindowOuter**)|hg:hg.mozilla.org/mozilla-central:dom/base/nsGlobalWindowOuter.cpp:90234f4c094dcc794df28fdd464793dfe065f943|7194|0x5f
0|5|libxul.so|nsGlobalWindowOuter::OpenJS(nsTSubstring<char16_t> const&, nsTSubstring<char16_t> const&, nsTSubstring<char16_t> const&, nsPIDOMWindowOuter**)|hg:hg.mozilla.org/mozilla-central:dom/base/nsGlobalWindowOuter.cpp:90234f4c094dcc794df28fdd464793dfe065f943|5720|0x18
0|6|libxul.so|nsGlobalWindowOuter::OpenOuter(nsTSubstring<char16_t> const&, nsTSubstring<char16_t> const&, nsTSubstring<char16_t> const&, mozilla::ErrorResult&)|hg:hg.mozilla.org/mozilla-central:dom/base/nsGlobalWindowOuter.cpp:90234f4c094dcc794df28fdd464793dfe065f943|5683|0x26
0|7|libxul.so|nsGlobalWindowInner::Open(nsTSubstring<char16_t> const&, nsTSubstring<char16_t> const&, nsTSubstring<char16_t> const&, mozilla::ErrorResult&)|hg:hg.mozilla.org/mozilla-central:dom/base/nsGlobalWindowInner.cpp:90234f4c094dcc794df28fdd464793dfe065f943|3678|0x29
0|8|libxul.so|mozilla::dom::Window_Binding::open|s3:gecko-generated-sources:487b4004d7f8cc0f65bee78feba3bf49629683abdb84c8b2e35913e35996d77efd84ac62ee67283dd3b2c18d581827b6b9a51f855a5090070ce48a34ecb8bf35/dom/bindings/WindowBinding.cpp:|2868|0x2d
0|9|libxul.so|bool mozilla::dom::binding_detail::GenericMethod<mozilla::dom::binding_detail::MaybeGlobalThisPolicy, mozilla::dom::binding_detail::ThrowExceptions>(JSContext*, unsigned int, JS::Value*)|hg:hg.mozilla.org/mozilla-central:dom/bindings/BindingUtils.cpp:90234f4c094dcc794df28fdd464793dfe065f943|3153|0x24
0|10|libxul.so|CallJSNative(JSContext*, bool (*)(JSContext*, unsigned int, JS::Value*), JS::CallArgs const&)|hg:hg.mozilla.org/mozilla-central:js/src/vm/Interpreter.cpp:90234f4c094dcc794df28fdd464793dfe065f943|443|0x13
0|11|libxul.so|js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct)|hg:hg.mozilla.org/mozilla-central:js/src/vm/Interpreter.cpp:90234f4c094dcc794df28fdd464793dfe065f943|535|0x12
0|12|libxul.so|InternalCall|hg:hg.mozilla.org/mozilla-central:js/src/vm/Interpreter.cpp:90234f4c094dcc794df28fdd464793dfe065f943|590|0xd
0|13|libxul.so|Interpret|hg:hg.mozilla.org/mozilla-central:js/src/vm/Interpreter.cpp:90234f4c094dcc794df28fdd464793dfe065f943|594|0xf
0|14|libxul.so|js::RunScript(JSContext*, js::RunState&)|hg:hg.mozilla.org/mozilla-central:js/src/vm/Interpreter.cpp:90234f4c094dcc794df28fdd464793dfe065f943|423|0xb
0|15|libxul.so|js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct)|hg:hg.mozilla.org/mozilla-central:js/src/vm/Interpreter.cpp:90234f4c094dcc794df28fdd464793dfe065f943|563|0xf
0|16|libxul.so|InternalCall|hg:hg.mozilla.org/mozilla-central:js/src/vm/Interpreter.cpp:90234f4c094dcc794df28fdd464793dfe065f943|590|0xd
0|17|libxul.so|js::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, js::AnyInvokeArgs const&, JS::MutableHandle<JS::Value>)|hg:hg.mozilla.org/mozilla-central:js/src/vm/Interpreter.cpp:90234f4c094dcc794df28fdd464793dfe065f943|606|0x5
0|18|libxul.so|JS::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, JS::HandleValueArray const&, JS::MutableHandle<JS::Value>)|hg:hg.mozilla.org/mozilla-central:js/src/jsapi.cpp:90234f4c094dcc794df28fdd464793dfe065f943|2636|0x1c
0|19|libxul.so|mozilla::dom::EventListener::HandleEvent(JSContext*, JS::Handle<JS::Value>, mozilla::dom::Event&, mozilla::ErrorResult&)|s3:gecko-generated-sources:9ca8646d8042e9b4b76d2e1b358b984be17743b71b832c0897d61bb500e0fecbe38fa54273dc522878c87fcb2c9bfd274a8190c7bc56fbbb58cb3ca68462e527/dom/bindings/EventListenerBinding.cpp:|52|0x5
0|20|libxul.so|void mozilla::dom::EventListener::HandleEvent<mozilla::dom::EventTarget*>(mozilla::dom::EventTarget* const&, mozilla::dom::Event&, mozilla::ErrorResult&, char const*, mozilla::dom::CallbackObject::ExceptionHandling, JS::Realm*)|s3:gecko-generated-sources:f3d9c01258576daaac3afc4fb3b283652e7f1168abb5287eff6775451ebd0ab6a0e4c8d88d3a67f7147042501bc091c6dfed25b4b8ccf4e4f420897b8d0ba906/dist/include/mozilla/dom/EventListenerBinding.h:|66|0x1c
0|21|libxul.so|mozilla::EventListenerManager::HandleEventSubType(mozilla::EventListenerManager::Listener*, mozilla::dom::Event*, mozilla::dom::EventTarget*)|hg:hg.mozilla.org/mozilla-central:dom/events/EventListenerManager.cpp:90234f4c094dcc794df28fdd464793dfe065f943|1040|0x1e
0|22|libxul.so|mozilla::EventListenerManager::HandleEventInternal(nsPresContext*, mozilla::WidgetEvent*, mozilla::dom::Event**, mozilla::dom::EventTarget*, nsEventStatus*, bool)|hg:hg.mozilla.org/mozilla-central:dom/events/EventListenerManager.cpp:90234f4c094dcc794df28fdd464793dfe065f943|1240|0x19
0|23|libxul.so|mozilla::EventTargetChainItem::HandleEvent(mozilla::EventChainPostVisitor&, mozilla::ELMCreationDetector&)|hg:hg.mozilla.org/mozilla-central:dom/events/EventDispatcher.cpp:90234f4c094dcc794df28fdd464793dfe065f943|351|0x6
0|24|libxul.so|mozilla::EventTargetChainItem::HandleEventTargetChain(nsTArray<mozilla::EventTargetChainItem>&, mozilla::EventChainPostVisitor&, mozilla::EventDispatchingCallback*, mozilla::ELMCreationDetector&)|hg:hg.mozilla.org/mozilla-central:dom/events/EventDispatcher.cpp:90234f4c094dcc794df28fdd464793dfe065f943|551|0x12
0|25|libxul.so|mozilla::EventDispatcher::Dispatch(nsISupports*, nsPresContext*, mozilla::WidgetEvent*, mozilla::dom::Event*, nsEventStatus*, mozilla::EventDispatchingCallback*, nsTArray<mozilla::dom::EventTarget*>*)|hg:hg.mozilla.org/mozilla-central:dom/events/EventDispatcher.cpp:90234f4c094dcc794df28fdd464793dfe065f943|1047|0x1a
0|26|libxul.so|mozilla::EventDispatcher::DispatchDOMEvent(nsISupports*, mozilla::WidgetEvent*, mozilla::dom::Event*, nsPresContext*, nsEventStatus*)|hg:hg.mozilla.org/mozilla-central:dom/events/EventDispatcher.cpp:90234f4c094dcc794df28fdd464793dfe065f943|1147|0x19
0|27|libxul.so|nsINode::DispatchEvent(mozilla::dom::Event&, mozilla::dom::CallerType, mozilla::ErrorResult&)|hg:hg.mozilla.org/mozilla-central:dom/base/nsINode.cpp:90234f4c094dcc794df28fdd464793dfe065f943|1025|0x5
0|28|libxul.so|nsContentUtils::DispatchEvent(mozilla::dom::Document*, nsISupports*, nsTSubstring<char16_t> const&, mozilla::CanBubble, mozilla::Cancelable, mozilla::Composed, mozilla::Trusted, bool*, mozilla::ChromeOnlyDispatch)|hg:hg.mozilla.org/mozilla-central:dom/base/nsContentUtils.cpp:90234f4c094dcc794df28fdd464793dfe065f943|4055|0x30
0|29|libxul.so|nsContentUtils::DispatchTrustedEvent(mozilla::dom::Document*, nsISupports*, nsTSubstring<char16_t> const&, mozilla::CanBubble, mozilla::Cancelable, mozilla::Composed, bool*)|hg:hg.mozilla.org/mozilla-central:dom/base/nsContentUtils.cpp:90234f4c094dcc794df28fdd464793dfe065f943|4026|0x19
0|30|libxul.so|mozilla::dom::Document::DispatchContentLoadedEvents()|hg:hg.mozilla.org/mozilla-central:dom/base/Document.cpp:90234f4c094dcc794df28fdd464793dfe065f943|4997|0x40
0|31|libxul.so|mozilla::detail::RunnableMethodImpl<mozilla::dom::Document*, void (mozilla::dom::Document::*)(), true, (mozilla::RunnableKind)0>::Run()|hg:hg.mozilla.org/mozilla-central:xpcom/threads/nsThreadUtils.h:90234f4c094dcc794df28fdd464793dfe065f943|1174|0x13
0|32|libxul.so|mozilla::SchedulerGroup::Runnable::Run()|hg:hg.mozilla.org/mozilla-central:xpcom/threads/SchedulerGroup.cpp:90234f4c094dcc794df28fdd464793dfe065f943|295|0x15
0|33|libxul.so|nsThread::ProcessNextEvent(bool, bool*)|hg:hg.mozilla.org/mozilla-central:xpcom/threads/nsThread.cpp:90234f4c094dcc794df28fdd464793dfe065f943|1180|0x15
0|34|libxul.so|NS_ProcessNextEvent(nsIThread*, bool)|hg:hg.mozilla.org/mozilla-central:xpcom/threads/nsThreadUtils.cpp:90234f4c094dcc794df28fdd464793dfe065f943|486|0x11
0|35|libxul.so|mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*)|hg:hg.mozilla.org/mozilla-central:ipc/glue/MessagePump.cpp:90234f4c094dcc794df28fdd464793dfe065f943|88|0xa
0|36|libxul.so|MessageLoop::RunInternal()|hg:hg.mozilla.org/mozilla-central:ipc/chromium/src/base/message_loop.cc:90234f4c094dcc794df28fdd464793dfe065f943|315|0x17
0|37|libxul.so|MessageLoop::Run()|hg:hg.mozilla.org/mozilla-central:ipc/chromium/src/base/message_loop.cc:90234f4c094dcc794df28fdd464793dfe065f943|290|0x8
0|38|libxul.so|nsBaseAppShell::Run()|hg:hg.mozilla.org/mozilla-central:widget/nsBaseAppShell.cpp:90234f4c094dcc794df28fdd464793dfe065f943|137|0xd
0|39|libxul.so|XRE_RunAppShell()|hg:hg.mozilla.org/mozilla-central:toolkit/xre/nsEmbedFunctions.cpp:90234f4c094dcc794df28fdd464793dfe065f943|919|0x11
0|40|libxul.so|mozilla::ipc::MessagePumpForChildProcess::Run(base::MessagePump::Delegate*)|hg:hg.mozilla.org/mozilla-central:ipc/glue/MessagePump.cpp:90234f4c094dcc794df28fdd464793dfe065f943|238|0x5
0|41|libxul.so|MessageLoop::RunInternal()|hg:hg.mozilla.org/mozilla-central:ipc/chromium/src/base/message_loop.cc:90234f4c094dcc794df28fdd464793dfe065f943|315|0x17
0|42|libxul.so|MessageLoop::Run()|hg:hg.mozilla.org/mozilla-central:ipc/chromium/src/base/message_loop.cc:90234f4c094dcc794df28fdd464793dfe065f943|290|0x8
0|43|libxul.so|XRE_InitChildProcess(int, char**, XREChildData const*)|hg:hg.mozilla.org/mozilla-central:toolkit/xre/nsEmbedFunctions.cpp:90234f4c094dcc794df28fdd464793dfe065f943|757|0xc
0|44|firefox-bin|content_process_main(mozilla::Bootstrap*, int, char**)|hg:hg.mozilla.org/mozilla-central:ipc/contentproc/plugin-container.cpp:90234f4c094dcc794df28fdd464793dfe065f943|56|0x14
0|45|firefox-bin|main|hg:hg.mozilla.org/mozilla-central:browser/app/nsBrowserApp.cpp:90234f4c094dcc794df28fdd464793dfe065f943|263|0x11
0|46|libc-2.27.so||||0x21b97
0|47|firefox-bin|MOZ_ReportCrash|hg:hg.mozilla.org/mozilla-central:mfbt/Assertions.h:90234f4c094dcc794df28fdd464793dfe065f943|184|0x5

nika: Could you take a look for redirect the needinfo?

So it looks like the cause of this is related to the call to SetOpenerWindow in ReallyOpenedDocShellItem. If I remember correctly this particular call is usually not necessary (because we've set our opener before somewhere else), but is done redunantly because at the time I didn't understand how this mechanism works well enough to find the problem with it.

All of this was neatly documented & summed up by me in my elegant comment:

    if (!aForceNoOpener) {
      piOpenedWindow->SetOpenerWindow(aParent, aWindowIsNew);  // damnit
    } else if (aParent && aParent != piOpenedWindow) {

What's interesting here is that we apparently have a disagreement as to what the exact opener for this window should be. I'm not super confident about what the cause is, but I wouldn't be surprised at all if it's triggered by another document taking priority during the nested event loop and confusing some form of subject-principal-based opener calculation.

I'll try to reproduce this under rr to see if I can figure out what exactly is going on here later today.

This code doesn't exist anymore.