Testcase found while fuzzing mozilla-central rev c9041757a18a (built with: --enable-debug --enable-fuzzing).
Testcase can be reproduced using the following commands:
$ pip install fuzzfetch grizzly-framework
$ python -m fuzzfetch --build c9041757a18a --debug --fuzzing -n firefox
$ python -m grizzly.replay ./firefox/firefox testcase.html
Assertion failure: leaf, at /dom/events/EventStateManager.cpp:5778
==184697==ERROR: UndefinedBehaviorSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7f5efb41f9e1 bp 0x7fffe458a920 sp 0x7fffe458a8e0 T184697)
==184697==The signal is caused by a WRITE memory access.
==184697==Hint: address points to the zero page.
#0 0x7f5efb41f9e1 in mozilla::EventStateManager::RemoveNodeFromChainIfNeeded(mozilla::dom::ElementState, nsIContent*, bool) /dom/events/EventStateManager.cpp:5778:3
#1 0x7f5efb41fcd6 in mozilla::EventStateManager::ContentRemoved(mozilla::dom::Document*, nsIContent*) /dom/events/EventStateManager.cpp:5855:3
#2 0x7f5efd09e4ff in mozilla::PresShell::ContentRemoved(nsIContent*, nsIContent*) /layout/base/PresShell.cpp:4603:38
#3 0x7f5ef98a32bb in operator() /dom/base/MutationObservers.cpp:196:3
#4 0x7f5ef98a32bb in Notify<IsRemoval::Yes, ShouldAssert::Yes, (lambda at /dom/base/MutationObservers.cpp:196:3), (lambda at /dom/base/MutationObservers.cpp:196:3)> /dom/base/MutationObservers.cpp:91:5
#5 0x7f5ef98a32bb in mozilla::dom::MutationObservers::NotifyContentRemoved(nsINode*, nsIContent*, nsIContent*) /dom/base/MutationObservers.cpp:197:3
#6 0x7f5ef9a2f40b in nsINode::RemoveChildNode(nsIContent*, bool) /dom/base/nsINode.cpp:2182:5
#7 0x7f5ef9795cda in mozilla::dom::Document::RemoveChildNode(nsIContent*, bool) /dom/base/Document.cpp:7148:12
#8 0x7f5ef9a2ef20 in nsINode::ReplaceChildren(nsINode*, mozilla::ErrorResult&) /dom/base/nsINode.cpp:2150:5
#9 0x7f5ef9a2eba0 in nsINode::ReplaceChildren(mozilla::dom::Sequence<mozilla::dom::OwningNodeOrString> const&, mozilla::ErrorResult&) /dom/base/nsINode.cpp:2132:10
#10 0x7f5efab20321 in mozilla::dom::Document_Binding::replaceChildren(JSContext*, JS::Handle<JSObject*>, void*, JSJitMethodCallArgs const&) /builds/worker/workspace/obj-build/dom/bindings/DocumentBinding.cpp:19319:24
#11 0x7f5efaeb802c in bool mozilla::dom::binding_detail::GenericMethod<mozilla::dom::binding_detail::NormalThisPolicy, mozilla::dom::binding_detail::ThrowExceptions>(JSContext*, unsigned int, JS::Value*) /dom/bindings/BindingUtils.cpp:3287:13
#12 0x7f5f00563cfc in CallJSNative(JSContext*, bool (*)(JSContext*, unsigned int, JS::Value*), js::CallReason, JS::CallArgs const&) /js/src/vm/Interpreter.cpp:458:13
#13 0x7f5f00563621 in js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct, js::CallReason) /js/src/vm/Interpreter.cpp:546:12
#14 0x7f5f0055a958 in CallFromStack /js/src/vm/Interpreter.cpp:618:10
#15 0x7f5f0055a958 in Interpret(JSContext*, js::RunState&) /js/src/vm/Interpreter.cpp:3374:16
#16 0x7f5f005519fd in js::RunScript(JSContext*, js::RunState&) /js/src/vm/Interpreter.cpp:430:13
#17 0x7f5f0056351d in js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct, js::CallReason) /js/src/vm/Interpreter.cpp:578:13
#18 0x7f5f00564a5c in js::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, js::AnyInvokeArgs const&, JS::MutableHandle<JS::Value>, js::CallReason) /js/src/vm/Interpreter.cpp:645:8
#19 0x7f5eff421077 in js::CallSelfHostedFunction(JSContext*, JS::Handle<js::PropertyName*>, JS::Handle<JS::Value>, js::AnyInvokeArgs const&, JS::MutableHandle<JS::Value>) /js/src/vm/SelfHosting.cpp:1498:10
#20 0x7f5eff1b7f69 in AsyncFunctionResume(JSContext*, JS::Handle<js::AsyncFunctionGeneratorObject*>, ResumeKind, JS::Handle<JS::Value>) /js/src/vm/AsyncFunction.cpp:154:8
#21 0x7f5eff3a008f in AsyncFunctionPromiseReactionJob /js/src/builtin/Promise.cpp:2111:12
#22 0x7f5eff3a008f in PromiseReactionJob(JSContext*, unsigned int, JS::Value*) /js/src/builtin/Promise.cpp:2174:12
#23 0x7f5f00563cfc in CallJSNative(JSContext*, bool (*)(JSContext*, unsigned int, JS::Value*), js::CallReason, JS::CallArgs const&) /js/src/vm/Interpreter.cpp:458:13
#24 0x7f5f00563621 in js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct, js::CallReason) /js/src/vm/Interpreter.cpp:546:12
#25 0x7f5f00564a5c in js::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, js::AnyInvokeArgs const&, JS::MutableHandle<JS::Value>, js::CallReason) /js/src/vm/Interpreter.cpp:645:8
#26 0x7f5eff1e391c in JS::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, JS::HandleValueArray const&, JS::MutableHandle<JS::Value>) /js/src/vm/CallAndConstruct.cpp:117:10
#27 0x7f5efa0e692d in mozilla::dom::PromiseJobCallback::Call(mozilla::dom::BindingCallContext&, JS::Handle<JS::Value>, mozilla::ErrorResult&) /builds/worker/workspace/obj-build/dom/bindings/PromiseBinding.cpp:35:8
#28 0x7f5ef7c4d015 in mozilla::dom::PromiseJobCallback::Call(mozilla::ErrorResult&, char const*, mozilla::dom::CallbackObject::ExceptionHandling, JS::Realm*) /builds/worker/workspace/obj-build/dist/include/mozilla/dom/PromiseBinding.h:88:12
#29 0x7f5ef7c4c2d3 in Call /builds/worker/workspace/obj-build/dist/include/mozilla/dom/PromiseBinding.h:101:12
#30 0x7f5ef7c4c2d3 in mozilla::PromiseJobRunnable::Run(mozilla::AutoSlowOperation&) /xpcom/base/CycleCollectedJSContext.cpp:213:18
#31 0x7f5ef7c39f78 in mozilla::CycleCollectedJSContext::PerformMicroTaskCheckPoint(bool) /xpcom/base/CycleCollectedJSContext.cpp:676:17
#32 0x7f5ef7c3adec in mozilla::CycleCollectedJSContext::AfterProcessTask(unsigned int) /xpcom/base/CycleCollectedJSContext.cpp:463:3
#33 0x7f5ef8ae2cb5 in XPCJSContext::AfterProcessTask(unsigned int) /js/xpconnect/src/XPCJSContext.cpp:1480:28
#34 0x7f5ef7d5e0dc in nsThread::ProcessNextEvent(bool, bool*) /xpcom/threads/nsThread.cpp:1242:24
#35 0x7f5ef7d6432d in NS_ProcessNextEvent(nsIThread*, bool) /xpcom/threads/nsThreadUtils.cpp:465:10
#36 0x7f5ef8944716 in mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*) /ipc/glue/MessagePump.cpp:85:21
#37 0x7f5ef8869d77 in MessageLoop::RunInternal() /ipc/chromium/src/base/message_loop.cc:381:10
#38 0x7f5ef8869c82 in RunHandler /ipc/chromium/src/base/message_loop.cc:374:3
#39 0x7f5ef8869c82 in MessageLoop::Run() /ipc/chromium/src/base/message_loop.cc:356:3
#40 0x7f5efcd27708 in nsBaseAppShell::Run() /widget/nsBaseAppShell.cpp:150:27
#41 0x7f5efef1e89b in XRE_RunAppShell() /toolkit/xre/nsEmbedFunctions.cpp:880:20
#42 0x7f5ef894560a in mozilla::ipc::MessagePumpForChildProcess::Run(base::MessagePump::Delegate*) /ipc/glue/MessagePump.cpp:235:9
#43 0x7f5ef8869d77 in MessageLoop::RunInternal() /ipc/chromium/src/base/message_loop.cc:381:10
#44 0x7f5ef8869c82 in RunHandler /ipc/chromium/src/base/message_loop.cc:374:3
#45 0x7f5ef8869c82 in MessageLoop::Run() /ipc/chromium/src/base/message_loop.cc:356:3
#46 0x7f5efef1ddb3 in XRE_InitChildProcess(int, char**, XREChildData const*) /toolkit/xre/nsEmbedFunctions.cpp:739:34
#47 0x55aa0a509b39 in content_process_main /browser/app/../../ipc/contentproc/plugin-container.cpp:57:28
#48 0x55aa0a509b39 in main /browser/app/nsBrowserApp.cpp:359:18
#49 0x7f5f0f07ed8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#50 0x7f5f0f07ee3f in __libc_start_main csu/../csu/libc-start.c:392:3
#51 0x55aa0a4df8dc in _start (/home/jkratzer/builds/mc-debug/firefox-bin+0x168dc) (BuildId: e5b5ca556772264f29159c13c21a77fdcef14354)
UndefinedBehaviorSanitizer can not provide additional info.
SUMMARY: UndefinedBehaviorSanitizer: SEGV /dom/events/EventStateManager.cpp:5778:3 in mozilla::EventStateManager::RemoveNodeFromChainIfNeeded(mozilla::dom::ElementState, nsIContent*, bool)
==184697==ABORTING
Description
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