Testcase found while fuzzing mozilla-central rev 7d4944635684 (built with: --enable-debug --enable-fuzzing).

Testcase can be reproduced using the following commands:

$ pip install fuzzfetch grizzly-framework
$ python -m fuzzfetch --build 7d4944635684 --debug --fuzzing -n firefox
$ python -m grizzly.replay ./firefox/firefox testcase.html

Assertion failure: aNewFrame->GetParent() == outOfFlowFrameList->mContainingBlock (Parent of the frame is not the containing block?), at /layout/base/nsCSSFrameConstructor.cpp:1143

    ==752596==ERROR: UndefinedBehaviorSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7fc94c1cb725 bp 0x7ffcb0084b20 sp 0x7ffcb0084ac0 T752596)
    ==752596==The signal is caused by a WRITE memory access.
    ==752596==Hint: address points to the zero page.
    ==752596==WARNING: Symbolizer buffer too small
    ==752596==WARNING: Symbolizer buffer too small
        #0 0x7fc94c1cb725 in nsFrameConstructorState::AddChild(nsIFrame*, nsFrameList&, nsIContent*, nsContainerFrame*, bool, bool, bool, bool, nsIFrame*) /layout/base/nsCSSFrameConstructor.cpp:1142:5
        #1 0x7fc94c1d9598 in nsCSSFrameConstructor::ConstructScrollableBlock(nsFrameConstructorState&, nsCSSFrameConstructor::FrameConstructionItem&, nsContainerFrame*, nsStyleDisplay const*, nsFrameList&) /layout/base/nsCSSFrameConstructor.cpp:4547:10
        #2 0x7fc94c1da783 in nsCSSFrameConstructor::ConstructFrameFromItemInternal(nsCSSFrameConstructor::FrameConstructionItem&, nsFrameConstructorState&, nsContainerFrame*, nsFrameList&) /layout/base/nsCSSFrameConstructor.cpp:3674:16
        #3 0x7fc94c1df003 in nsCSSFrameConstructor::ConstructFramesFromItem(nsFrameConstructorState&, nsCSSFrameConstructor::FrameConstructionItemList::Iterator&, nsContainerFrame*, nsFrameList&) /layout/base/nsCSSFrameConstructor.cpp:5582:3
        #4 0x7fc94c1d01c9 in nsCSSFrameConstructor::ConstructFramesFromItemList(nsFrameConstructorState&, nsCSSFrameConstructor::FrameConstructionItemList&, nsContainerFrame*, bool, nsFrameList&) /layout/base/nsCSSFrameConstructor.cpp:9471:5
        #5 0x7fc94c1d1967 in nsCSSFrameConstructor::ProcessChildren(nsFrameConstructorState&, nsIContent*, mozilla::ComputedStyle*, nsContainerFrame*, bool, nsFrameList&, bool, nsIFrame*) /layout/base/nsCSSFrameConstructor.cpp:9755:3
        #6 0x7fc94c1d527d in nsCSSFrameConstructor::ConstructBlock(nsFrameConstructorState&, nsIContent*, nsContainerFrame*, nsContainerFrame*, mozilla::ComputedStyle*, nsContainerFrame**, nsFrameList&, nsIFrame*) /layout/base/nsCSSFrameConstructor.cpp:10607:3
        #7 0x7fc94c1d39a6 in nsCSSFrameConstructor::ConstructDocElementFrame(mozilla::dom::Element*) /layout/base/nsCSSFrameConstructor.cpp:2483:5
        #8 0x7fc94c1e38c7 in nsCSSFrameConstructor::ContentRangeInserted(nsIContent*, nsIContent*, nsCSSFrameConstructor::InsertionKind) /layout/base/nsCSSFrameConstructor.cpp:6883:9
        #9 0x7fc94c177f32 in mozilla::PresShell::Initialize() /layout/base/PresShell.cpp:1898:26
        #10 0x7fc9489fa146 in nsContentSink::StartLayout(bool) /dom/base/nsContentSink.cpp:562:30
        #11 0x7fc947dd1b58 in nsHtml5TreeOpExecutor::StartLayout(bool*) /parser/html/nsHtml5TreeOpExecutor.cpp:881:18
        #12 0x7fc947dd0591  (/home/jkratzer/builds/m-c-20221028044355-fuzzing-debug/libxul.so+0x4cd5591) (BuildId: da39803629e113a3f61ca95cec24c51ef2b91ae1)
        #13 0x7fc947dcee34  (/home/jkratzer/builds/m-c-20221028044355-fuzzing-debug/libxul.so+0x4cd3e34) (BuildId: da39803629e113a3f61ca95cec24c51ef2b91ae1)
        #14 0x7fc947dd55e3 in StyleLineNumber, opSetScriptLineNumberAndFreeze, opSvgLoad, opMaybeComplainAboutCharset, opMaybeComplainAboutDeepTree, opAddClass, opAddViewSourceHref, opAddViewSourceBase, opAddErrorType, opAddLineNumberId, opStartLayout, opEnableEncodingMenu> &> /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:279:14
        #15 0x7fc947dd55e3 in match<TreeOperationMatcher, mozilla::Variant<uninitialized, opAppend, opDetach, opAppendChildrenToNewParent, opFosterParent, opAppendToDocument, opAddAttributes, nsHtml5DocumentMode, opCreateHTMLElement, opCreateSVGElement, opCreateMathMLElement, opSetFormElement, opAppendText, opFosterParentText, opAppendComment, opAppendCommentToDocument, opAppendDoctypeToDocument, opGetDocumentFragmentForTemplate, opGetFosterParent, opMarkAsBroken, opRunScript, opRunScriptAsyncDefer, opPreventScriptExecution, opDoneAddingChildren, opDoneCreatingElement, opUpdateCharsetSource, opCharsetSwitchTo, opUpdateStyleSheet, opProcessOfflineManifest, opMarkMalformedIfScript, opStreamEnded, opSetStyleLineNumber, opSetScriptLineNumberAndFreeze, opSvgLoad, opMaybeComplainAboutCharset, opMaybeComplainAboutDeepTree, opAddClass, opAddViewSourceHref, opAddViewSourceBase, opAddErrorType, opAddLineNumberId, opStartLayout, opEnableEncodingMenu> &> /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:279:14
        #16 0x7fc947dd55e3 in match<TreeOperationMatcher, mozilla::Variant<uninitialized, opAppend, opDetach, opAppendChildrenToNewParent, opFosterParent, opAppendToDocument, opAddAttributes, nsHtml5DocumentMode, opCreateHTMLElement, opCreateSVGElement, opCreateMathMLElement, opSetFormElement, opAppendText, opFosterParentText, opAppendComment, opAppendCommentToDocument, opAppendDoctypeToDocument, opGetDocumentFragmentForTemplate, opGetFosterParent, opMarkAsBroken, opRunScript, opRunScriptAsyncDefer, opPreventScriptExecution, opDoneAddingChildren, opDoneCreatingElement, opUpdateCharsetSource, opCharsetSwitchTo, opUpdateStyleSheet, opProcessOfflineManifest, opMarkMalformedIfScript, opStreamEnded, opSetStyleLineNumber, opSetScriptLineNumberAndFreeze, opSvgLoad, opMaybeComplainAboutCharset, opMaybeComplainAboutDeepTree, opAddClass, opAddViewSourceHref, opAddViewSourceBase, opAddErrorType, opAddLineNumberId, opStartLayout, opEnableEncodingMenu> &> /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:279:14
        #17 0x7fc947dd55e3 in match<TreeOperationMatcher, mozilla::Variant<uninitialized, opAppend, opDetach, opAppendChildrenToNewParent, opFosterParent, opAppendToDocument, opAddAttributes, nsHtml5DocumentMode, opCreateHTMLElement, opCreateSVGElement, opCreateMathMLElement, opSetFormElement, opAppendText, opFosterParentText, opAppendComment, opAppendCommentToDocument, opAppendDoctypeToDocument, opGetDocumentFragmentForTemplate, opGetFosterParent, opMarkAsBroken, opRunScript, opRunScriptAsyncDefer, opPreventScriptExecution, opDoneAddingChildren, opDoneCreatingElement, opUpdateCharsetSource, opCharsetSwitchTo, opUpdateStyleSheet, opProcessOfflineManifest, opMarkMalformedIfScript, opStreamEnded, opSetStyleLineNumber, opSetScriptLineNumberAndFreeze, opSvgLoad, opMaybeComplainAboutCharset, opMaybeComplainAboutDeepTree, opAddClass, opAddViewSourceHref, opAddViewSourceBase, opAddErrorType, opAddLineNumberId, opStartLayout, opEnableEncodingMenu> &> /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:279:14
        #18 0x7fc947dd55e3 in match<TreeOperationMatcher, mozilla::Variant<uninitialized, opAppend, opDetach, opAppendChildrenToNewParent, opFosterParent, opAppendToDocument, opAddAttributes, nsHtml5DocumentMode, opCreateHTMLElement, opCreateSVGElement, opCreateMathMLElement, opSetFormElement, opAppendText, opFosterParentText, opAppendComment, opAppendCommentToDocument, opAppendDoctypeToDocument, opGetDocumentFragmentForTemplate, opGetFosterParent, opMarkAsBroken, opRunScript, opRunScriptAsyncDefer, opPreventScriptExecution, opDoneAddingChildren, opDoneCreatingElement, opUpdateCharsetSource, opCharsetSwitchTo, opUpdateStyleSheet, opProcessOfflineManifest, opMarkMalformedIfScript, opStreamEnded, opSetStyleLineNumber, opSetScriptLineNumberAndFreeze, opSvgLoad, opMaybeComplainAboutCharset, opMaybeComplainAboutDeepTree, opAddClass, opAddViewSourceHref, opAddViewSourceBase, opAddErrorType, opAddLineNumberId, opStartLayout, opEnableEncodingMenu> &> /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:279:14
        #19 0x7fc947dd55e3 in match<TreeOperationMatcher, mozilla::Variant<uninitialized, opAppend, opDetach, opAppendChildrenToNewParent, opFosterParent, opAppendToDocument, opAddAttributes, nsHtml5DocumentMode, opCreateHTMLElement, opCreateSVGElement, opCreateMathMLElement, opSetFormElement, opAppendText, opFosterParentText, opAppendComment, opAppendCommentToDocument, opAppendDoctypeToDocument, opGetDocumentFragmentForTemplate, opGetFosterParent, opMarkAsBroken, opRunScript, opRunScriptAsyncDefer, opPreventScriptExecution, opDoneAddingChildren, opDoneCreatingElement, opUpdateCharsetSource, opCharsetSwitchTo, opUpdateStyleSheet, opProcessOfflineManifest, opMarkMalformedIfScript, opStreamEnded, opSetStyleLineNumber, opSetScriptLineNumberAndFreeze, opSvgLoad, opMaybeComplainAboutCharset, opMaybeComplainAboutDeepTree, opAddClass, opAddViewSourceHref, opAddViewSourceBase, opAddErrorType, opAddLineNumberId, opStartLayout, opEnableEncodingMenu> &> /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:279:14
        #20 0x7fc947dd55e3 in match<TreeOperationMatcher, mozilla::Variant<uninitialized, opAppend, opDetach, opAppendChildrenToNewParent, opFosterParent, opAppendToDocument, opAddAttributes, nsHtml5DocumentMode, opCreateHTMLElement, opCreateSVGElement, opCreateMathMLElement, opSetFormElement, opAppendText, opFosterParentText, opAppendComment, opAppendCommentToDocument, opAppendDoctypeToDocument, opGetDocumentFragmentForTemplate, opGetFosterParent, opMarkAsBroken, opRunScript, opRunScriptAsyncDefer, opPreventScriptExecution, opDoneAddingChildren, opDoneCreatingElement, opUpdateCharsetSource, opCharsetSwitchTo, opUpdateStyleSheet, opProcessOfflineManifest, opMarkMalformedIfScript, opStreamEnded, opSetStyleLineNumber, opSetScriptLineNumberAndFreeze, opSvgLoad, opMaybeComplainAboutCharset, opMaybeComplainAboutDeepTree, opAddClass, opAddViewSourceHref, opAddViewSourceBase, opAddErrorType, opAddLineNumberId, opStartLayout, opEnableEncodingMenu> &> /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:279:14
        #21 0x7fc947dd55e3 in match<TreeOperationMatcher, mozilla::Variant<uninitialized, opAppend, opDetach, opAppendChildrenToNewParent, opFosterParent, opAppendToDocument, opAddAttributes, nsHtml5DocumentMode, opCreateHTMLElement, opCreateSVGElement, opCreateMathMLElement, opSetFormElement, opAppendText, opFosterParentText, opAppendComment, opAppendCommentToDocument, opAppendDoctypeToDocument, opGetDocumentFragmentForTemplate, opGetFosterParent, opMarkAsBroken, opRunScript, opRunScriptAsyncDefer, opPreventScriptExecution, opDoneAddingChildren, opDoneCreatingElement, opUpdateCharsetSource, opCharsetSwitchTo, opUpdateStyleSheet, opProcessOfflineManifest, opMarkMalformedIfScript, opStreamEnded, opSetStyleLineNumber, opSetScriptLineNumberAndFreeze, opSvgLoad, opMaybeComplainAboutCharset, opMaybeComplainAboutDeepTree, opAddClass, opAddViewSourceHref, opAddViewSourceBase, opAddErrorType, opAddLineNumberId, opStartLayout, opEnableEncodingMenu> &> /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:279:14
        #22 0x7fc947dd55e3 in match<TreeOperationMatcher, mozilla::Variant<uninitialized, opAppend, opDetach, opAppendChildrenToNewParent, opFosterParent, opAppendToDocument, opAddAttributes, nsHtml5DocumentMode, opCreateHTMLElement, opCreateSVGElement, opCreateMathMLElement, opSetFormElement, opAppendText, opFosterParentText, opAppendComment, opAppendCommentToDocument, opAppendDoctypeToDocument, opGetDocumentFragmentForTemplate, opGetFosterParent, opMarkAsBroken, opRunScript, opRunScriptAsyncDefer, opPreventScriptExecution, opDoneAddingChildren, opDoneCreatingElement, opUpdateCharsetSource, opCharsetSwitchTo, opUpdateStyleSheet, opProcessOfflineManifest, opMarkMalformedIfScript, opStreamEnded, opSetStyleLineNumber, opSetScriptLineNumberAndFreeze, opSvgLoad, opMaybeComplainAboutCharset, opMaybeComplainAboutDeepTree, opAddClass, opAddViewSourceHref, opAddViewSourceBase, opAddErrorType, opAddLineNumberId, opStartLayout, opEnableEncodingMenu> &> /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:279:14
        #23 0x7fc947dd55e3 in match<TreeOperationMatcher, mozilla::Variant<uninitialized, opAppend, opDetach, opAppendChildrenToNewParent, opFosterParent, opAppendToDocument, opAddAttributes, nsHtml5DocumentMode, opCreateHTMLElement, opCreateSVGElement, opCreateMathMLElement, opSetFormElement, opAppendText, opFosterParentText, opAppendComment, opAppendCommentToDocument, opAppendDoctypeToDocument, opGetDocumentFragmentForTemplate, opGetFosterParent, opMarkAsBroken, opRunScript, opRunScriptAsyncDefer, opPreventScriptExecution, opDoneAddingChildren, opDoneCreatingElement, opUpdateCharsetSource, opCharsetSwitchTo, opUpdateStyleSheet, opProcessOfflineManifest, opMarkMalformedIfScript, opStreamEnded, opSetStyleLineNumber, opSetScriptLineNumberAndFreeze, opSvgLoad, opMaybeComplainAboutCharset, opMaybeComplainAboutDeepTree, opAddClass, opAddViewSourceHref, opAddViewSourceBase, opAddErrorType, opAddLineNumberId, opStartLayout, opEnableEncodingMenu> &> /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:279:14
        #24 0x7fc947dd55e3 in match<TreeOperationMatcher> /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:852:12
        #25 0x7fc947dd55e3 in nsHtml5TreeOperation::Perform(nsHtml5TreeOpExecutor*, nsIContent**, bool*, bool*) /parser/html/nsHtml5TreeOperation.cpp:1207:21
        #26 0x7fc946d7bed2 in nsHtml5ExecutorFlusher::Run() /parser/html/nsHtml5StreamParser.cpp:174:18
        #27 0x7fc946d86234 in mozilla::SchedulerGroup::Runnable::Run() /xpcom/threads/SchedulerGroup.cpp:140:20
        #28 0x7fc946d81831 in mozilla::TaskController::DoExecuteNextTaskOnlyMainThreadInternal(mozilla::detail::BaseAutoLock<mozilla::Mutex&> const&) /xpcom/threads/TaskController.cpp:851:26
        #29 0x7fc946d8038a in mozilla::TaskController::ExecuteNextTaskOnlyMainThreadInternal(mozilla::detail::BaseAutoLock<mozilla::Mutex&> const&) /xpcom/threads/TaskController.cpp:683:15
        #30 0x7fc946d806e5 in mozilla::TaskController::ProcessPendingMTTask(bool) /xpcom/threads/TaskController.cpp:461:36
        #31 0x7fc946d89b86 in operator() /xpcom/threads/TaskController.cpp:187:37
        #32 0x7fc946d89b86 in mozilla::detail::RunnableFunction<mozilla::TaskController::InitializeInternal()::$_2>::Run() /builds/worker/workspace/obj-build/dist/include/nsThreadUtils.h:531:5
        #33 0x7fc946d9f487 in nsThread::ProcessNextEvent(bool, bool*) /xpcom/threads/nsThread.cpp:1204:16
        #34 0x7fc946da5c8d in NS_ProcessNextEvent(nsIThread*, bool) /xpcom/threads/nsThreadUtils.cpp:465:10
        #35 0x7fc947997356 in mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*) /ipc/glue/MessagePump.cpp:85:21
        #36 0x7fc9478bb0c7 in MessageLoop::RunInternal() /ipc/chromium/src/base/message_loop.cc:381:10
        #37 0x7fc9478bafd2 in RunHandler /ipc/chromium/src/base/message_loop.cc:374:3
        #38 0x7fc9478bafd2 in MessageLoop::Run() /ipc/chromium/src/base/message_loop.cc:356:3
        #39 0x7fc94bdfd258 in nsBaseAppShell::Run() /widget/nsBaseAppShell.cpp:150:27
        #40 0x7fc94e03076b in XRE_RunAppShell() /toolkit/xre/nsEmbedFunctions.cpp:884:20
        #41 0x7fc94799824a in mozilla::ipc::MessagePumpForChildProcess::Run(base::MessagePump::Delegate*) /ipc/glue/MessagePump.cpp:235:9
        #42 0x7fc9478bb0c7 in MessageLoop::RunInternal() /ipc/chromium/src/base/message_loop.cc:381:10
        #43 0x7fc9478bafd2 in RunHandler /ipc/chromium/src/base/message_loop.cc:374:3
        #44 0x7fc9478bafd2 in MessageLoop::Run() /ipc/chromium/src/base/message_loop.cc:356:3
        #45 0x7fc94e02fd70 in XRE_InitChildProcess(int, char**, XREChildData const*) /toolkit/xre/nsEmbedFunctions.cpp:743:34
        #46 0x5631a44aec19 in content_process_main /browser/app/../../ipc/contentproc/plugin-container.cpp:57:28
        #47 0x5631a44aec19 in main /browser/app/nsBrowserApp.cpp:357:18
        #48 0x7fc95db06d8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
        #49 0x7fc95db06e3f in __libc_start_main csu/../csu/libc-start.c:392:3
        #50 0x5631a44848dc in _start (/home/jkratzer/builds/m-c-20221028044355-fuzzing-debug/firefox-bin+0x168dc) (BuildId: 1def38b84386732da1b99f3310f4fe0b61bb9400)
    
    UndefinedBehaviorSanitizer can not provide additional info.
    SUMMARY: UndefinedBehaviorSanitizer: SEGV /layout/base/nsCSSFrameConstructor.cpp:1142:5 in nsFrameConstructorState::AddChild(nsIFrame*, nsFrameList&, nsIContent*, nsContainerFrame*, bool, bool, bool, bool, nsIFrame*)
    ==752596==ABORTING

Testcase crashes using the initial build (mozilla-central 20221028044355-7d4944635684) but not with tip (mozilla-central 20221031155647-dc344f30a13a.)

The bug appears to have been fixed in the following build range:

Start: efff883fd5acc1f334dbf6734c3a0eb2d3742b91 (20221028094453)
End: 5bd477e565175cf9e1fe55931462e2393df9c61f (20221028085519)
Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=efff883fd5acc1f334dbf6734c3a0eb2d3742b91&tochange=5bd477e565175cf9e1fe55931462e2393df9c61f

jkratzer, can you confirm that the above bisection range is responsible for fixing this issue?
Removing bugmon keyword as no further action possible. Please review the bug and re-add the keyword for further analysis.

https://hg.mozilla.org/mozilla-central/rev/5bb04ea9ed21

:emilio, could this have been fixed via bug 1797703?

Yes, indeed.