Testcase found while fuzzing mozilla-central rev fb9c01b719fa (built with --enable-debug).

Assertion failure: !mFlags.mSpecialBSizeReflow || !aFrame->IsSubtreeDirty() (frame should be clean when getting special bsize reflow), at /builds/worker/checkouts/gecko/layout/generic/ReflowInput.cpp:192

    #0 0x7fc0692b4f58 in mozilla::ReflowInput::ReflowInput(nsPresContext*, mozilla::ReflowInput const&, nsIFrame*, mozilla::LogicalSize const&, mozilla::Maybe<mozilla::LogicalSize> const&, unsigned int) /builds/worker/checkouts/gecko/layout/generic/ReflowInput.cpp:191:3
    #1 0x7fc06948b776 in nsTableFrame::ReflowChildren(mozilla::TableReflowInput&, nsReflowStatus&, nsIFrame*&, nsOverflowAreas&) /builds/worker/checkouts/gecko/layout/tables/nsTableFrame.cpp:2946:19
    #2 0x7fc069489b07 in nsTableFrame::ReflowTable(mozilla::ReflowOutput&, mozilla::ReflowInput const&, int, nsIFrame*&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/tables/nsTableFrame.cpp:2035:3
    #3 0x7fc069488ed7 in nsTableFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/tables/nsTableFrame.cpp:1859:7
    #4 0x7fc069302380 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1075:14
    #5 0x7fc0694a9b98 in nsTableWrapperFrame::OuterDoReflowChild(nsPresContext*, nsIFrame*, mozilla::ReflowInput const&, mozilla::ReflowOutput&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/tables/nsTableWrapperFrame.cpp:783:3
    #6 0x7fc0694aad67 in nsTableWrapperFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/tables/nsTableWrapperFrame.cpp:936:3
    #7 0x7fc0692e9aca in nsBlockReflowContext::ReflowBlock(mozilla::LogicalRect const&, bool, nsCollapsingMargin&, int, bool, nsLineBox*, mozilla::ReflowInput&, nsReflowStatus&, mozilla::BlockReflowInput&) /builds/worker/checkouts/gecko/layout/generic/nsBlockReflowContext.cpp:294:11
    #8 0x7fc0692e5898 in nsBlockFrame::ReflowBlockFrame(mozilla::BlockReflowInput&, nsLineList_iterator, bool*) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:3833:11
    #9 0x7fc0692e36e6 in nsBlockFrame::ReflowLine(mozilla::BlockReflowInput&, nsLineList_iterator, bool*) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:3169:5
    #10 0x7fc0692de453 in nsBlockFrame::ReflowDirtyLines(mozilla::BlockReflowInput&) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:2707:7
    #11 0x7fc0692da5d9 in nsBlockFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:1368:3
    #12 0x7fc069302380 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1075:14
    #13 0x7fc0693016e8 in nsCanvasFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsCanvasFrame.cpp:749:5
    #14 0x7fc0692cfd68 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, int, int, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1115:14
    #15 0x7fc0693f6eb3 in nsPageContentFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsPageContentFrame.cpp:63:5
    #16 0x7fc0692cfd68 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, int, int, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1115:14
    #17 0x7fc0693f7807 in nsPageFrame::ReflowPageContent(nsPresContext*, mozilla::ReflowInput const&) /builds/worker/checkouts/gecko/layout/generic/nsPageFrame.cpp:136:3
    #18 0x7fc0693f7a11 in nsPageFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsPageFrame.cpp:163:13
    #19 0x7fc069302380 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1075:14
    #20 0x7fc0692b3159 in mozilla::PrintedSheetFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/PrintedSheetFrame.cpp:130:5
    #21 0x7fc0692cfd68 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, int, int, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1115:14
    #22 0x7fc0693fb712 in nsPageSequenceFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsPageSequenceFrame.cpp:287:5
    #23 0x7fc069302380 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1075:14
    #24 0x7fc069341259 in nsHTMLScrollFrame::ReflowScrolledFrame(mozilla::ScrollReflowInput*, bool, bool, mozilla::ReflowOutput*) /builds/worker/checkouts/gecko/layout/generic/nsGfxScrollFrame.cpp:755:3
    #25 0x7fc069341d55 in nsHTMLScrollFrame::ReflowContents(mozilla::ScrollReflowInput*, mozilla::ReflowOutput const&) /builds/worker/checkouts/gecko/layout/generic/nsGfxScrollFrame.cpp:879:3
    #26 0x7fc069345aff in nsHTMLScrollFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsGfxScrollFrame.cpp:1277:3
    #27 0x7fc0692cfd68 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, int, int, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1115:14
    #28 0x7fc0692cf8c0 in mozilla::ViewportFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/ViewportFrame.cpp:297:7
    #29 0x7fc0691daab4 in mozilla::PresShell::DoReflow(nsIFrame*, bool, mozilla::OverflowChangedTracker*) /builds/worker/checkouts/gecko/layout/base/PresShell.cpp:9643:11
    #30 0x7fc0691e416e in mozilla::PresShell::ProcessReflowCommands(bool) /builds/worker/checkouts/gecko/layout/base/PresShell.cpp:9816:24
    #31 0x7fc0691e3868 in mozilla::PresShell::DoFlushPendingNotifications(mozilla::ChangesToFlush) /builds/worker/checkouts/gecko/layout/base/PresShell.cpp:4239:11
    #32 0x7fc069658126 in nsPrintJob::ReflowPrintObject(mozilla::UniquePtr<nsPrintObject, mozilla::DefaultDelete<nsPrintObject> > const&) /builds/worker/checkouts/gecko/layout/printing/nsPrintJob.cpp:1888:14
    #33 0x7fc06965717d in nsPrintJob::ReflowDocList(mozilla::UniquePtr<nsPrintObject, mozilla::DefaultDelete<nsPrintObject> > const&, bool) /builds/worker/checkouts/gecko/layout/printing/nsPrintJob.cpp:1478:3
    #34 0x7fc069653868 in nsPrintJob::InitPrintDocConstruction(bool) /builds/worker/checkouts/gecko/layout/printing/nsPrintJob.cpp:1510:3
    #35 0x7fc06965a282 in nsPrintJob::Observe(nsISupports*, char const*, char16_t const*) /builds/worker/checkouts/gecko/layout/printing/nsPrintJob.cpp:2646:17
    #36 0x7fc06a6b7968 in mozilla::embedding::PrintProgressDialogChild::RecvDialogOpened() /builds/worker/checkouts/gecko/toolkit/components/printingui/ipc/PrintProgressDialogChild.cpp:37:18
    #37 0x7fc065733e3b in mozilla::embedding::PPrintProgressDialogChild::OnMessageReceived(IPC::Message const&) /builds/worker/workspace/obj-build/ipc/ipdl/PPrintProgressDialogChild.cpp:228:28
    #38 0x7fc065486e8d in mozilla::dom::PContentChild::OnMessageReceived(IPC::Message const&) /builds/worker/workspace/obj-build/ipc/ipdl/PContentChild.cpp:8797:32
    #39 0x7fc06530e6fe in mozilla::ipc::MessageChannel::DispatchAsyncMessage(mozilla::ipc::ActorLifecycleProxy*, IPC::Message const&) /builds/worker/checkouts/gecko/ipc/glue/MessageChannel.cpp:2150:25
    #40 0x7fc06530aebf in mozilla::ipc::MessageChannel::DispatchMessage(IPC::Message&&) /builds/worker/checkouts/gecko/ipc/glue/MessageChannel.cpp:2074:9
    #41 0x7fc06530c2c6 in mozilla::ipc::MessageChannel::RunMessage(mozilla::ipc::MessageChannel::MessageTask&) /builds/worker/checkouts/gecko/ipc/glue/MessageChannel.cpp:1922:3
    #42 0x7fc06530ceeb in mozilla::ipc::MessageChannel::MessageTask::Run() /builds/worker/checkouts/gecko/ipc/glue/MessageChannel.cpp:1953:13
    #43 0x7fc0649fe4df in mozilla::RunnableTask::Run() /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:242:16
    #44 0x7fc0649fc55a in mozilla::TaskController::DoExecuteNextTaskOnlyMainThreadInternal(mozilla::detail::BaseAutoLock<mozilla::Mutex&> const&) /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:512:26
    #45 0x7fc0649fb6b4 in mozilla::TaskController::ExecuteNextTaskOnlyMainThreadInternal(mozilla::detail::BaseAutoLock<mozilla::Mutex&> const&) /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:371:15
    #46 0x7fc0649fb867 in mozilla::TaskController::ProcessPendingMTTask(bool) /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:168:36
    #47 0x7fc064a03216 in operator() /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:83:37
    #48 0x7fc064a03216 in mozilla::detail::RunnableFunction<mozilla::TaskController::InitializeInternal()::$_4>::Run() /builds/worker/workspace/obj-build/dist/include/nsThreadUtils.h:577:5
    #49 0x7fc064a1661f in nsThread::ProcessNextEvent(bool, bool*) /builds/worker/checkouts/gecko/xpcom/threads/nsThread.cpp:1234:14
    #50 0x7fc064a1bfca in NS_ProcessNextEvent(nsIThread*, bool) /builds/worker/checkouts/gecko/xpcom/threads/nsThreadUtils.cpp:513:10
    #51 0x7fc065313ff6 in mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*) /builds/worker/checkouts/gecko/ipc/glue/MessagePump.cpp:87:21
    #52 0x7fc065286c13 in MessageLoop::RunInternal() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:334:10
    #53 0x7fc065286b2d in RunHandler /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:327:3
    #54 0x7fc065286b2d in MessageLoop::Run() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:309:3
    #55 0x7fc068f18338 in nsBaseAppShell::Run() /builds/worker/checkouts/gecko/widget/nsBaseAppShell.cpp:137:27
    #56 0x7fc06a6f0373 in XRE_RunAppShell() /builds/worker/checkouts/gecko/toolkit/xre/nsEmbedFunctions.cpp:913:20
    #57 0x7fc065314db9 in mozilla::ipc::MessagePumpForChildProcess::Run(base::MessagePump::Delegate*) /builds/worker/checkouts/gecko/ipc/glue/MessagePump.cpp:237:9
    #58 0x7fc065286c13 in MessageLoop::RunInternal() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:334:10
    #59 0x7fc065286b2d in RunHandler /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:327:3
    #60 0x7fc065286b2d in MessageLoop::Run() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:309:3
    #61 0x7fc06a6eff58 in XRE_InitChildProcess(int, char**, XREChildData const*) /builds/worker/checkouts/gecko/toolkit/xre/nsEmbedFunctions.cpp:744:34
    #62 0x555d403db957 in content_process_main /builds/worker/checkouts/gecko/browser/app/../../ipc/contentproc/plugin-container.cpp:56:28
    #63 0x555d403db957 in main /builds/worker/checkouts/gecko/browser/app/nsBrowserApp.cpp:303:18
    #64 0x7fc0790cc0b2 in __libc_start_main /build/glibc-YYA7BZ/glibc-2.31/csu/../csu/libc-start.c:308:16
    #65 0x555d403b9709 in _start (/home/worker/builds/m-c-20200906094118-fuzzing-debug/firefox-bin+0x17709)

I am able to reproduce this locally. Let's try bugmon one more time, since it has been a while.

Oh I wonder if bugmon failed because of the call to self.printPreview() which requires a fuzzing build. I've replaced that with a call to self.print().

Unable to reproduce bug 1663685 using build mozilla-central 20211229092739-153a98aa1de7. Without a baseline, bugmon is unable to analyze this bug.
Removing bugmon keyword as no further action possible. Please review the bug and re-add the keyword for further analysis.

The testcase in comment 3 doesn't reproduce for me. This testcase however does, and doesn't require a call to self.print().

Verified bug as reproducible on mozilla-central 20221229092636-c5ddc463e9f8.
The bug appears to have been introduced in the following build range:

Start: 71eb757374eb3bf875ad164016051ee8a4463644 (20221130221357)
End: 47c3acb30de24f5e38cab7daa67e9bb0cd56cafc (20221130233108)
Pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=71eb757374eb3bf875ad164016051ee8a4463644&tochange=47c3acb30de24f5e38cab7daa67e9bb0cd56cafc

:mrobinson, since you are the author of the regressor, bug 1791759, could you take a look?

For more information, please visit auto_nag documentation.

I'm investigating this assertion failure and hope to have a fix soon.

The code for determining this is now shared with that for contain: size,
since the specification says that content-visibility follows contain: size in determining applicability.

https://hg.mozilla.org/mozilla-central/rev/228f4a8ccf96

Verified bug as fixed on rev mozilla-central 20230113213947-963d01420434.
Removing bugmon keyword as no further action possible. Please review the bug and re-add the keyword for further analysis.