Created attachment 246652 [details] Test case Load this with debug WK: <!DOCTYPE html> <style> * { letter-spacing: 2821vmin; zoom: 7823; } </style> <form> <small> <abbr> <mark> <rp> <label> <q></q> </label> </rp> </mark> </abbr> </small> </form> Backtrace: SHOULD NEVER BE REACHED ../../Source/WebCore/platform/text/Hyphenation.cpp(41) : size_t WebCore::lastHyphenLocation(WTF::StringView, size_t, const WTF::AtomicString&) Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fff94ed1700 (LWP 13064)] 0x00007fffed74709f in WTFCrash () at ../../Source/WTF/wtf/Assertions.cpp:321 321 *(int *)(uintptr_t)0xbbadbeef = 0; #0 0x00007fffed74709f in WTFCrash () at ../../Source/WTF/wtf/Assertions.cpp:321 #1 0x00007ffff3754eb5 in WebCore::lastHyphenLocation () at ../../Source/WebCore/platform/text/Hyphenation.cpp:41 #2 0x00007ffff39a91d6 in WebCore::maxWordFragmentWidth (renderer=0x7fffd9fa8500, style=..., font=..., word=..., minimumPrefixLength=0, minimumSuffixLength=0, suffixStart=@0x7fffffff9e4c: 0, fallbackFonts=..., glyphOverflow=...) at ../../Source/WebCore/rendering/RenderText.cpp:654 #3 0x00007ffff39aa059 in WebCore::RenderText::computePreferredLogicalWidths (this=0x7fffd9fa8500, leadWidth=0, fallbackFonts=..., glyphOverflow=...) at ../../Source/WebCore/rendering/RenderText.cpp:820 #4 0x00007ffff39abad8 in WebCore::RenderText::width (this=0x7fffd9fa8500, from=0, len=1, f=..., xPos=0, fallbackFonts=0x7fffffffa858, glyphOverflow=0x7fffffffa060) at ../../Source/WebCore/rendering/RenderText.cpp:1234 #5 0x00007ffff39ff26d in WebCore::textWidth (text=0x7fffd9fa8500, from=0, len=1, font=..., xPos=0, isFixedPitch=false, collapseWhiteSpace=true, fallbackFonts=..., layout=0x0) at ../../Source/WebCore/rendering/line/BreakingContextInlineHeaders.h:505 #6 0x00007ffff3a02041 in WebCore::BreakingContext::handleText (this=0x7fffffffa3b0, wordMeasurements=..., hyphenated=@0x7fffffffa718: false, consecutiveHyphenatedLines=@0x7fffffffa510: 0) at ../../Source/WebCore/rendering/line/BreakingContextInlineHeaders.h:903 #7 0x00007ffff39fc401 in WebCore::LineBreaker::nextSegmentBreak (this=0x7fffffffa710, resolver=..., lineInfo=..., renderTextInfo=..., lastFloatFromPreviousLine=0x0, consecutiveHyphenatedLines=0, wordMeasurements=...) at ../../Source/WebCore/rendering/line/LineBreaker.cpp:115 #8 0x00007ffff39fc09f in WebCore::LineBreaker::nextLineBreak (this=0x7fffffffa710, resolver=..., lineInfo=..., renderTextInfo=..., lastFloatFromPreviousLine=0x0, consecutiveHyphenatedLines=0, wordMeasurements=...) at ../../Source/WebCore/rendering/line/LineBreaker.cpp:82 #9 0x00007ffff3812e5c in WebCore::RenderBlockFlow::layoutRunsAndFloatsInRange (this=0x7fffd9fcfb80, layoutState=..., resolver=..., cleanLineStart=..., cleanLineBidiStatus=..., consecutiveHyphenatedLines=0) at ../../Source/WebCore/rendering/RenderBlockLineLayout.cpp:1180 #10 0x00007ffff38129cf in WebCore::RenderBlockFlow::layoutRunsAndFloats (this=0x7fffd9fcfb80, layoutState=..., hasInlineChild=true) at ../../Source/WebCore/rendering/RenderBlockLineLayout.cpp:1124 #11 0x00007ffff381526f in WebCore::RenderBlockFlow::layoutLineBoxes (this=0x7fffd9fcfb80, relayoutChildren=false, repaintLogicalTop=..., repaintLogicalBottom=...) at ../../Source/WebCore/rendering/RenderBlockLineLayout.cpp:1542 #12 0x00007ffff37f477d in WebCore::RenderBlockFlow::layoutInlineChildren (this=0x7fffd9fcfb80, relayoutChildren=false, repaintLogicalTop=..., repaintLogicalBottom=...) at ../../Source/WebCore/rendering/RenderBlockFlow.cpp:647 #13 0x00007ffff37f3a94 in WebCore::RenderBlockFlow::layoutBlock (this=0x7fffd9fcfb80, relayoutChildren=false, pageLogicalHeight=...) at ../../Source/WebCore/rendering/RenderBlockFlow.cpp:479 #14 0x00007ffff37c9623 in WebCore::RenderBlock::layout (this=0x7fffd9fcfb80) at ../../Source/WebCore/rendering/RenderBlock.cpp:926 #15 0x00007ffff37f4b44 in WebCore::RenderBlockFlow::layoutBlockChild (this=0x7fffd9fcf958, child=..., marginInfo=..., previousFloatLogicalBottom=..., maxFloatLogicalBottom=...) at ../../Source/WebCore/rendering/RenderBlockFlow.cpp:705 #16 0x00007ffff37f468b in WebCore::RenderBlockFlow::layoutBlockChildren (this=0x7fffd9fcf958, relayoutChildren=false, maxFloatLogicalBottom=...) at ../../Source/WebCore/rendering/RenderBlockFlow.cpp:628 #17 0x00007ffff37f3ab8 in WebCore::RenderBlockFlow::layoutBlock (this=0x7fffd9fcf958, relayoutChildren=false, pageLogicalHeight=...) at ../../Source/WebCore/rendering/RenderBlockFlow.cpp:481 #18 0x00007ffff37c9623 in WebCore::RenderBlock::layout (this=0x7fffd9fcf958) at ../../Source/WebCore/rendering/RenderBlock.cpp:926 #19 0x00007ffff37f4b44 in WebCore::RenderBlockFlow::layoutBlockChild (this=0x7fffd9fcf8a0, child=..., marginInfo=..., previousFloatLogicalBottom=..., maxFloatLogicalBottom=...) at ../../Source/WebCore/rendering/RenderBlockFlow.cpp:705 #20 0x00007ffff37f468b in WebCore::RenderBlockFlow::layoutBlockChildren (this=0x7fffd9fcf8a0, relayoutChildren=true, maxFloatLogicalBottom=...) at ../../Source/WebCore/rendering/RenderBlockFlow.cpp:628 #21 0x00007ffff37f3ab8 in WebCore::RenderBlockFlow::layoutBlock (this=0x7fffd9fcf8a0, relayoutChildren=true, pageLogicalHeight=...) at ../../Source/WebCore/rendering/RenderBlockFlow.cpp:481 #22 0x00007ffff37c9623 in WebCore::RenderBlock::layout (this=0x7fffd9fcf8a0) at ../../Source/WebCore/rendering/RenderBlock.cpp:926 #23 0x00007ffff37f4b44 in WebCore::RenderBlockFlow::layoutBlockChild (this=0x7fffd97ea218, child=..., marginInfo=..., previousFloatLogicalBottom=..., maxFloatLogicalBottom=...) at ../../Source/WebCore/rendering/RenderBlockFlow.cpp:705 #24 0x00007ffff37f468b in WebCore::RenderBlockFlow::layoutBlockChildren (this=0x7fffd97ea218, relayoutChildren=true, maxFloatLogicalBottom=...) at ../../Source/WebCore/rendering/RenderBlockFlow.cpp:628 #25 0x00007ffff37f3ab8 in WebCore::RenderBlockFlow::layoutBlock (this=0x7fffd97ea218, relayoutChildren=true, pageLogicalHeight=...) at ../../Source/WebCore/rendering/RenderBlockFlow.cpp:481 #26 0x00007ffff37c9623 in WebCore::RenderBlock::layout (this=0x7fffd97ea218) at ../../Source/WebCore/rendering/RenderBlock.cpp:926 #27 0x00007ffff39c894f in WebCore::RenderView::layoutContent (this=0x7fffd97ea218, state=...) at ../../Source/WebCore/rendering/RenderView.cpp:232 #28 0x00007ffff39c901f in WebCore::RenderView::layout (this=0x7fffd97ea218) at ../../Source/WebCore/rendering/RenderView.cpp:357 #29 0x00007ffff352cda2 in WebCore::FrameView::layout (this=0x7fffd8017800, allowSubtree=true) at ../../Source/WebCore/page/FrameView.cpp:1317 #30 0x00007ffff2ed1413 in WebCore::Document::implicitClose (this=0x7fffd8040fc0) at ../../Source/WebCore/dom/Document.cpp:2498 #31 0x00007ffff33d148b in WebCore::FrameLoader::checkCallImplicitClose (this=0x7fffd97f1098) at ../../Source/WebCore/loader/FrameLoader.cpp:895 #32 0x00007ffff33d11f7 in WebCore::FrameLoader::checkCompleted (this=0x7fffd97f1098) at ../../Source/WebCore/loader/FrameLoader.cpp:841 #33 0x00007ffff33d0f60 in WebCore::FrameLoader::finishedParsing (this=0x7fffd97f1098) at ../../Source/WebCore/loader/FrameLoader.cpp:761 #34 0x00007ffff2eda3ba in WebCore::Document::finishedParsing (this=0x7fffd8040fc0) at ../../Source/WebCore/dom/Document.cpp:4638 #35 0x00007ffff324cd45 in WebCore::HTMLConstructionSite::finishedParsing (this=0x7fffd97e74a0) at ../../Source/WebCore/html/parser/HTMLConstructionSite.cpp:404 #36 0x00007ffff3289862 in WebCore::HTMLTreeBuilder::finished (this=0x7fffd97e7480) at ../../Source/WebCore/html/parser/HTMLTreeBuilder.cpp:2940 #37 0x00007ffff32556e0 in WebCore::HTMLDocumentParser::end (this=0x7fffd8017c80) at ../../Source/WebCore/html/parser/HTMLDocumentParser.cpp:402 #38 0x00007ffff32557ae in WebCore::HTMLDocumentParser::attemptToRunDeferredScriptsAndEnd (this=0x7fffd8017c80) at ../../Source/WebCore/html/parser/HTMLDocumentParser.cpp:411 #39 0x00007ffff325445e in WebCore::HTMLDocumentParser::prepareToStopParsing (this=0x7fffd8017c80) at ../../Source/WebCore/html/parser/HTMLDocumentParser.cpp:132 #40 0x00007ffff32557e5 in WebCore::HTMLDocumentParser::attemptToEnd (this=0x7fffd8017c80) at ../../Source/WebCore/html/parser/HTMLDocumentParser.cpp:423 #41 0x00007ffff3255893 in WebCore::HTMLDocumentParser::finish (this=0x7fffd8017c80) at ../../Source/WebCore/html/parser/HTMLDocumentParser.cpp:451 #42 0x00007ffff33c1571 in WebCore::DocumentWriter::end (this=0x7fffd801ac20) at ../../Source/WebCore/loader/DocumentWriter.cpp:247 #43 0x00007ffff33acbd1 in WebCore::DocumentLoader::finishedLoading (this=0x7fffd801ab80, finishTime=0) at ../../Source/WebCore/loader/DocumentLoader.cpp:441 #44 0x00007ffff33ac93a in WebCore::DocumentLoader::notifyFinished (this=0x7fffd801ab80, resource=0x7fffd803ca40) at ../../Source/WebCore/loader/DocumentLoader.cpp:375 #45 0x00007ffff3461090 in WebCore::CachedResource::checkNotify (this=0x7fffd803ca40) at ../../Source/WebCore/loader/cache/CachedResource.cpp:293 #46 0x00007ffff346118e in WebCore::CachedResource::finishLoading (this=0x7fffd803ca40) at ../../Source/WebCore/loader/cache/CachedResource.cpp:309 #47 0x00007ffff345d6f5 in WebCore::CachedRawResource::finishLoading (this=0x7fffd803ca40, data=0x7fffd9fc8330) at ../../Source/WebCore/loader/cache/CachedRawResource.cpp:104 #48 0x00007ffff340feb9 in WebCore::SubresourceLoader::didFinishLoading (this=0x7fffd8011000, finishTime=0) at ../../Source/WebCore/loader/SubresourceLoader.cpp:364 #49 0x00007ffff340b7f3 in WebCore::ResourceLoader::didFinishLoading (this=0x7fffd8011000, finishTime=0) at ../../Source/WebCore/loader/ResourceLoader.cpp:542 #50 0x00007ffff3dbe10f in WebCore::readCallback (asyncResult=0x7901f0, data=0x7fffd9fc4000) at ../../Source/WebCore/platform/network/soup/ResourceHandleSoup.cpp:1295 #51 0x00007fffeb27c7e6 in async_ready_callback_wrapper (source_object=0x7c72d0, res=0x7901f0, user_data=user_data@entry=0x7fffd9fc4000) at ginputstream.c:523 #52 0x00007fffeb2a20e5 in g_task_return_now (task=0x7901f0) at gtask.c:1077 #53 0x00007fffeb2a2109 in complete_in_idle_cb (task=0x7901f0) at gtask.c:1086 #54 0x00007fffea55aa1d in g_main_dispatch (context=0x478b00) at gmain.c:3064 #55 g_main_context_dispatch (context=context@entry=0x478b00) at gmain.c:3663 #56 0x00007fffea55ad88 in g_main_context_iterate (context=0x478b00, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3734 #57 0x00007fffea55b04a in g_main_loop_run (loop=0x901c90) at gmain.c:3928 #58 0x00007ffff44b7750 in WTF::RunLoop::run () at ../../Source/WTF/wtf/gtk/RunLoopGtk.cpp:59 #59 0x00007ffff29a854c in WebKit::ChildProcessMain<WebKit::WebProcess, WebKit::WebProcessMain> (argc=2, argv=0x7fffffffd948) at ../../Source/WebKit2/Shared/unix/ChildProcessMain.h:61 #60 0x00007ffff29a83b1 in WebKit::WebProcessMainUnix (argc=2, argv=0x7fffffffd948) at ../../Source/WebKit2/WebProcess/gtk/WebProcessMainGtk.cpp:77 #61 0x00000000004008d1 in main (argc=2, argv=0x7fffffffd948) at ../../Source/WebKit2/WebProcess/EntryPoint/unix/WebProcessMain.cpp:44
I don't see an assertion with this test case, but it does seem to enter an endless loop in r204307.
We seem to enter an endless loop in WebCore::maxWordFragmentWidth, in the following code: while ((hyphenLocation = lastHyphenLocation(word, hyphenLocation, style.locale())) >= minimumPrefixLength) hyphenLocations.append(hyphenLocation); The 'lastHyphenLocation' keeps returning 0, which is >= minimumPrefixLength (which is also zero), and we never get out of the loop. This problem seems like it's been around for a few years.
<rdar://problem/27710431>
This appears to no longer happen in r226920