Testcase found while fuzzing mozilla-central rev 75cc42919ab2. ==11466==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000330 (pc 0x7f038463cc42 bp 0x7ffe31b35dd0 sp 0x7ffe31b35c00 T0) ==11466==The signal is caused by a READ memory access. ==11466==Hint: address points to the zero page. #0 0x7f038463cc41 in Length /builds/worker/workspace/build/src/obj-firefox/dist/include/nsTArray.h #1 0x7f038463cc41 in nsGridContainerFrame::GridReflowInput::InitializeForContinuation(nsGridContainerFrame*, int) /builds/worker/workspace/build/src/layout/generic/nsGridContainerFrame.cpp:1840 #2 0x7f038462f4ec in nsGridContainerFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/workspace/build/src/layout/generic/nsGridContainerFrame.cpp:6010:21 #3 0x7f03844702eb in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, unsigned int, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/workspace/build/src/layout/generic/nsContainerFrame.cpp:951:14 #4 0x7f0384620b36 in nsGridContainerFrame::ReflowInFlowChild(nsIFrame*, nsGridContainerFrame::GridItemInfo const*, nsSize, mozilla::Maybe<int> const&, nsGridContainerFrame::Fragmentainer const*, nsGridContainerFrame::GridReflowInput const&, mozilla::LogicalRect const&, mozilla::ReflowOutput&, nsReflowStatus&) /builds/worker/workspace/build/src/layout/generic/nsGridContainerFrame.cpp:5153:3 #5 0x7f038462666c in nsGridContainerFrame::ReflowRowsInFragmentainer(nsGridContainerFrame::GridReflowInput&, mozilla::LogicalRect const&, mozilla::ReflowOutput&, nsReflowStatus&, nsGridContainerFrame::Fragmentainer&, nsSize const&, nsTArray<nsGridContainerFrame::GridItemInfo const*> const&, unsigned int, unsigned int, int, int) /builds/worker/workspace/build/src/layout/generic/nsGridContainerFrame.cpp:5497:5 #6 0x7f0384624d7e in nsGridContainerFrame::ReflowInFragmentainer(nsGridContainerFrame::GridReflowInput&, mozilla::LogicalRect const&, mozilla::ReflowOutput&, nsReflowStatus&, nsGridContainerFrame::Fragmentainer&, nsSize const&) /builds/worker/workspace/build/src/layout/generic/nsGridContainerFrame.cpp:5399:10 #7 0x7f038462bb96 in nsGridContainerFrame::ReflowChildren(nsGridContainerFrame::GridReflowInput&, mozilla::LogicalRect const&, mozilla::ReflowOutput&, nsReflowStatus&) /builds/worker/workspace/build/src/layout/generic/nsGridContainerFrame.cpp:5715:13 #8 0x7f03846302a5 in nsGridContainerFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/workspace/build/src/layout/generic/nsGridContainerFrame.cpp:6038:11 #9 0x7f038441dd0b in nsBlockReflowContext::ReflowBlock(mozilla::LogicalRect const&, bool, nsCollapsingMargin&, int, bool, nsLineBox*, mozilla::ReflowInput&, nsReflowStatus&, mozilla::BlockReflowInput&) /builds/worker/workspace/build/src/layout/generic/nsBlockReflowContext.cpp:309:11 #10 0x7f038440f91b in nsBlockFrame::ReflowBlockFrame(mozilla::BlockReflowInput&, nsLineList_iterator, bool*) /builds/worker/workspace/build/src/layout/generic/nsBlockFrame.cpp:3571:11 #11 0x7f038440c74f in nsBlockFrame::ReflowLine(mozilla::BlockReflowInput&, nsLineList_iterator, bool*) /builds/worker/workspace/build/src/layout/generic/nsBlockFrame.cpp:2921:5 #12 0x7f03843fe87d in nsBlockFrame::ReflowDirtyLines(mozilla::BlockReflowInput&) /builds/worker/workspace/build/src/layout/generic/nsBlockFrame.cpp:2458:7 #13 0x7f03843f28b9 in nsBlockFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/workspace/build/src/layout/generic/nsBlockFrame.cpp:1292:3 #14 0x7f03844702eb in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, unsigned int, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/workspace/build/src/layout/generic/nsContainerFrame.cpp:951:14 #15 0x7f038447696a in nsColumnSetFrame::ReflowChildren(mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&, nsColumnSetFrame::ReflowConfig const&, bool, nsCollapsingMargin*, nsColumnSetFrame::ColumnBalanceData&) /builds/worker/workspace/build/src/layout/generic/nsColumnSetFrame.cpp:783:7 #16 0x7f038447cc5d in ReflowColumns /builds/worker/workspace/build/src/layout/generic/nsColumnSetFrame.cpp:473:19 #17 0x7f038447cc5d in nsColumnSetFrame::FindBestBalanceBSize(mozilla::ReflowInput const&, nsPresContext*, nsColumnSetFrame::ReflowConfig&, nsColumnSetFrame::ColumnBalanceData&, mozilla::ReflowOutput&, nsCollapsingMargin&, bool&, bool&, nsReflowStatus&) /builds/worker/workspace/build/src/layout/generic/nsColumnSetFrame.cpp:1124 #18 0x7f038447e04c in nsColumnSetFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/workspace/build/src/layout/generic/nsColumnSetFrame.cpp:1231:5 #19 0x7f03844702eb in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, unsigned int, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/workspace/build/src/layout/generic/nsContainerFrame.cpp:951:14 #20 0x7f038446daee in nsCanvasFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/workspace/build/src/layout/generic/nsCanvasFrame.cpp:803:5 #21 0x7f03844702eb in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, unsigned int, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/workspace/build/src/layout/generic/nsContainerFrame.cpp:951:14 #22 0x7f03845a349b in nsHTMLScrollFrame::ReflowScrolledFrame(mozilla::ScrollReflowInput*, bool, bool, mozilla::ReflowOutput*, bool) /builds/worker/workspace/build/src/layout/generic/nsGfxScrollFrame.cpp:606:3 #23 0x7f03845a4fec in nsHTMLScrollFrame::ReflowContents(mozilla::ScrollReflowInput*, mozilla::ReflowOutput const&) /builds/worker/workspace/build/src/layout/generic/nsGfxScrollFrame.cpp:730:3 #24 0x7f03845aa3d7 in nsHTMLScrollFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/workspace/build/src/layout/generic/nsGfxScrollFrame.cpp:1120:3 #25 0x7f03843cdd28 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, int, int, unsigned int, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/workspace/build/src/layout/generic/nsContainerFrame.cpp:995:14 #26 0x7f03843cc44b in mozilla::ViewportFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/workspace/build/src/layout/generic/ViewportFrame.cpp:338:7 #27 0x7f0384122ce1 in mozilla::PresShell::DoReflow(nsIFrame*, bool) /builds/worker/workspace/build/src/layout/base/PresShell.cpp:9020:11 #28 0x7f038413d958 in mozilla::PresShell::ProcessReflowCommands(bool) /builds/worker/workspace/build/src/layout/base/PresShell.cpp:9193:24 #29 0x7f038413bace in mozilla::PresShell::DoFlushPendingNotifications(mozilla::ChangesToFlush) /builds/worker/workspace/build/src/layout/base/PresShell.cpp:4351:11 #30 0x7f03840b02da in FlushPendingNotifications /builds/worker/workspace/build/src/layout/base/nsIPresShell.h:577:5 #31 0x7f03840b02da in nsRefreshDriver::Tick(mozilla::TimeStamp) /builds/worker/workspace/build/src/layout/base/nsRefreshDriver.cpp:1930 #32 0x7f03840c3072 in TickDriver /builds/worker/workspace/build/src/layout/base/nsRefreshDriver.cpp:325:13 #33 0x7f03840c3072 in mozilla::RefreshDriverTimer::TickRefreshDrivers(mozilla::TimeStamp, nsTArray<RefPtr<nsRefreshDriver> >&) /builds/worker/workspace/build/src/layout/base/nsRefreshDriver.cpp:300 #34 0x7f03840c2ba1 in mozilla::RefreshDriverTimer::Tick(mozilla::TimeStamp) /builds/worker/workspace/build/src/layout/base/nsRefreshDriver.cpp:318:5 #35 0x7f03840c5e41 in RunRefreshDrivers /builds/worker/workspace/build/src/layout/base/nsRefreshDriver.cpp:756:5 #36 0x7f03840c5e41 in mozilla::VsyncRefreshDriverTimer::RefreshDriverVsyncObserver::TickRefreshDriver(mozilla::TimeStamp) /builds/worker/workspace/build/src/layout/base/nsRefreshDriver.cpp:672 #37 0x7f03840c591b in mozilla::VsyncRefreshDriverTimer::RefreshDriverVsyncObserver::NotifyVsync(mozilla::TimeStamp) /builds/worker/workspace/build/src/layout/base/nsRefreshDriver.cpp:572:9 #38 0x7f0384b80c66 in mozilla::layout::VsyncChild::RecvNotify(mozilla::TimeStamp const&) /builds/worker/workspace/build/src/layout/ipc/VsyncChild.cpp:78:16 #39 0x7f037b9392fd in mozilla::layout::PVsyncChild::OnMessageReceived(IPC::Message const&) /builds/worker/workspace/build/src/obj-firefox/ipc/ipdl/PVsyncChild.cpp:167:20 #40 0x7f037b6c6ae8 in mozilla::ipc::PBackgroundChild::OnMessageReceived(IPC::Message const&) /builds/worker/workspace/build/src/obj-firefox/ipc/ipdl/PBackgroundChild.cpp:2280:28 #41 0x7f037af1d69e in mozilla::ipc::MessageChannel::DispatchAsyncMessage(IPC::Message const&) /builds/worker/workspace/build/src/ipc/glue/MessageChannel.cpp:2248:25 #42 0x7f037af18f8a in mozilla::ipc::MessageChannel::DispatchMessage(IPC::Message&&) /builds/worker/workspace/build/src/ipc/glue/MessageChannel.cpp:2175:17 #43 0x7f037af1b3ed in mozilla::ipc::MessageChannel::RunMessage(mozilla::ipc::MessageChannel::MessageTask&) /builds/worker/workspace/build/src/ipc/glue/MessageChannel.cpp:2012:5 #44 0x7f037af1c147 in mozilla::ipc::MessageChannel::MessageTask::Run() /builds/worker/workspace/build/src/ipc/glue/MessageChannel.cpp:2045:15 #45 0x7f0379d101a0 in nsThread::ProcessNextEvent(bool, bool*) /builds/worker/workspace/build/src/xpcom/threads/nsThread.cpp:1161:14 #46 0x7f0379d18f45 in NS_ProcessNextEvent(nsIThread*, bool) /builds/worker/workspace/build/src/xpcom/threads/nsThreadUtils.cpp:519:10 #47 0x7f037af2775e in mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*) /builds/worker/workspace/build/src/ipc/glue/MessagePump.cpp:97:21 #48 0x7f037ae2848c in RunInternal /builds/worker/workspace/build/src/ipc/chromium/src/base/message_loop.cc:325:10 #49 0x7f037ae2848c in RunHandler /builds/worker/workspace/build/src/ipc/chromium/src/base/message_loop.cc:318 #50 0x7f037ae2848c in MessageLoop::Run() /builds/worker/workspace/build/src/ipc/chromium/src/base/message_loop.cc:298 #51 0x7f03839da966 in nsBaseAppShell::Run() /builds/worker/workspace/build/src/widget/nsBaseAppShell.cpp:158:27 #52 0x7f0387e68dbe in XRE_RunAppShell() /builds/worker/workspace/build/src/toolkit/xre/nsEmbedFunctions.cpp:944:22 #53 0x7f037ae2848c in RunInternal /builds/worker/workspace/build/src/ipc/chromium/src/base/message_loop.cc:325:10 #54 0x7f037ae2848c in RunHandler /builds/worker/workspace/build/src/ipc/chromium/src/base/message_loop.cc:318 #55 0x7f037ae2848c in MessageLoop::Run() /builds/worker/workspace/build/src/ipc/chromium/src/base/message_loop.cc:298 #56 0x7f0387e67e75 in XRE_InitChildProcess(int, char**, XREChildData const*) /builds/worker/workspace/build/src/toolkit/xre/nsEmbedFunctions.cpp:770:34 #57 0x55a764063ba1 in content_process_main /builds/worker/workspace/build/src/browser/app/../../ipc/contentproc/plugin-container.cpp:50:30 #58 0x55a764063ba1 in main /builds/worker/workspace/build/src/browser/app/nsBrowserApp.cpp:287 #59 0x7f039b8dab96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310