Unfortunately I don't remember what I was doing when I hit this earlier today, but it's a web process crash in WebCore::StyleResolver::MatchResult::addMatchedProperties. It was a SIGBUS instead of the usual SIGSEGV: #0 0x00007f60a50cb3c2 in WTF::RefCountedBase::ref() const (this=0x3ff0000000000000) at /usr/src/debug/webkitgtk-2.16.5/Source/WTF/wtf/RefCounted.h:46 #1 0x00007f60a50cb3c2 in WTF::refIfNotNull<WebCore::StyleProperties>(WebCore::StyleProperties*) (ptr=0x3ff0000000000000) at /usr/src/debug/webkitgtk-2.16.5/Source/WTF/wtf/PassRefPtr.h:34 #2 0x00007f60a50cb3c2 in WTF::RefPtr<WebCore::StyleProperties>::RefPtr(WebCore::StyleProperties*) (ptr=0x3ff0000000000000, this=<synthetic pointer>) at /usr/src/debug/webkitgtk-2.16.5/Source/WTF/wtf/RefPtr.h:46 #3 0x00007f60a50cb3c2 in WTF::RefPtr<WebCore::StyleProperties>::operator=(WebCore::StyleProperties*) (optr=0x3ff0000000000000, this=0x7fff4eb59a20) at /usr/src/debug/webkitgtk-2.16.5/Source/WTF/wtf/RefPtr.h:144 #4 0x00007f60a50cb3c2 in WebCore::StyleResolver::MatchResult::addMatchedProperties(WebCore::StyleProperties const&, WebCore::StyleRule*, unsigned int, WebCore::PropertyWhitelistType, WebCore::Style::ScopeOrdinal) (this=this@entry=0x7fff4eb597d0, properties=..., rule=<optimized out>, rule@entry=0x0, linkMatchType=linkMatchType@entry=3, propertyWhitelistType=propertyWhitelistType@entry=WebCore::PropertyWhitelistNone, styleScopeOrdinal=styleScopeOrdinal@entry=WebCore::Style::ScopeOrdinal::Element) at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/StyleResolver.cpp:185 #5 0x00007f60a509e17b in WebCore::ElementRuleCollector::addElementStyleProperties(WebCore::StyleProperties const*, bool) (isCacheable=false, propertySet=<optimized out>, this=0x7fff4eb59350) at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/ElementRuleCollector.cpp:134 #6 0x00007f60a509e17b in WebCore::ElementRuleCollector::matchAllRules(bool, bool) (this=this@entry=0x7fff4eb59350, matchAuthorAndUserStyles=<optimized out>, includeSMILProperties=<optimized out>) at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/ElementRuleCollector.cpp:563 #7 0x00007f60a50d0e01 in WebCore::StyleResolver::styleForElement(WebCore::Element const&, WebCore::RenderStyle const*, WebCore::RenderStyle const*, WebCore::RuleMatchingBehavior, WebCore::RenderRegion const*, WebCore::SelectorFilter const*) (this=0x7f5ffaf62000, element= ..., parentStyle=parentStyle@entry=0x7f600fd1a9f8, parentBoxStyle=parentBoxStyle@entry=0x0, matchingBehavior=matchingBehavior@entry=WebCore::MatchAllRules, regionForStyling=<optimized out>, selectorFilter=<optimized out>) at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/css/StyleResolver.cpp:415 state = @0x7f5ffaf62250: {m_element = 0x7f5fd5427ab0, m_style = std::unique_ptr<WebCore::RenderStyle> containing 0x7f600fd1aaa8, m_parentStyle = 0x7f600fd1a9f8, m_ownedParentStyle = std::unique_ptr<WebCore::RenderStyle> containing 0x0, m_rootElementStyle = 0x7f6091938b40, m_regionForStyling = 0x0, m_elementLinkState = WebCore::NotInsideLink, m_applyPropertyToRegularStyle = true, m_applyPropertyToVisitedLinkStyle = false, m_fontDirty = false, m_fontSizeHasViewportUnits = false, m_hasUAAppearance = false, m_borderData = {m_left = {m_width = 3, m_color = {static black = 4278190080, static white = 4294967295, static darkGray = 4286611584, static gray = 4288716960, static lightGray = 4290822336, static transparent = 0, static cyan = 4278255615, static yellow = 4294967040, static compositionFill = 4292992341, static extendedColor = 0, static invalidRGBAColor = 1, static validRGBAColorBit = 2, static validRGBAColor = 3, static deletedHashValue = 18446744073709551613, static emptyHashValue = 18446744073709551611, m_colorData = {rgbaAndFlags = 1, extendedColor = 0x1}}, m_style = 0, m_isAuto = 0}, m_right = {m_width = 3, m_color = {static black = 4278190080, static white = 4294967295, static darkGray = 4286611584, static gray = 4288716960, static lightGray = 4290822336, static transparent = 0, static cyan = 4278255615, static yellow = 4294967040, static compositionFill = 4292992341, static extendedColor = 0, static invalidRGBAColor = 1, static validRGBAColorBit = 2, static validRGBAColor = 3, static deletedHashValue = 18446744073709551613, static emptyHashValue = 18446744073709551611, m_colorData = {rgbaAndFlags = 1, extendedColor = 0x1}}, m_style = 0, m_isAuto = 0}, m_top = {m_width = 3, m_color = {static black = 4278190080, static white = 4294967295, static darkGray = 4286611584, static gray = 4288716960, static lightGray = 4290822336, static transparent = 0, static cyan = 4278255615, static yellow = 4294967040, static compositionFill = 4292992341, static extendedColor = 0, static invalidRGBAColor = 1, static validRGBAColorBit = 2, static validRGBAColor = 3, static deletedHashValue = 18446744073709551613, static emptyHashValue = 18446744073709551611, m_colorData = {rgbaAndFlags = 1, extendedColor = 0x1}}, m_style = 0, m_isAuto = 0}, m_bottom = {m_width = 3, m_color = {static black = 4278190080, static white = 4294967295, static darkGray = 4286611584, static gray = 4288716960, static lightGray = 4290822336, static transparent = 0, static cyan = 4278255615, static yellow = 4294967040, static compositionFill = 4292992341, static extendedColor = 0, static invalidRGBAColor = 1, static validRGBAColorBit = 2, static validRGBAColor = 3, static deletedHashValue = 18446744073709551613, static emptyHashValue = 18446744073709551611, m_colorData = {rgbaAndFlags = 1, extendedColor = 0x1}}, m_style = 0, m_isAuto = 0}, m_image = {m_data = {m_data = {static isRef = <optimized out>, m_ptr = 0x7f60919c90e0}}}, m_topLeft = {width = {{m_intValue = 0, m_floatValue = 0, m_calculationValueHandle = 0}, m_hasQuirk = false, m_type = 3 '\003', m_isFloat = false}, height = {{m_intValue = 0, m_floatValue = 0, m_calculationValueHandle = 0}, m_hasQuirk = false, m_type = 3 '\003', m_isFloat = false}}, m_topRight = {width = {{m_intValue = 0, m_floatValue = 0, m_calculationValueHandle = 0}, m_hasQuirk = false, m_type = 3 '\003', m_isFloat = false}, height = {{m_intValue = 0, m_floatValue = 0, m_calculationValueHandle = 0}, m_hasQuirk = false, m_type = 3 '\003', m_isFloat = false}}, m_bottomLeft = {width = {{m_intValue = 0, m_floatValue = 0, m_calculationValueHandle = 0}, m_hasQuirk = false, m_type = 3 '\003', m_isFloat = false}, height = {{m_intValue = 0, m_floatValue = 0, m_calculationValueHandle = 0}, m_hasQuirk = false, m_type = 3 '\003', m_isFloat = false}}, m_bottomRight = {width = {{m_intValue = 0, m_floatValue = 0, m_calculationValueHandle = 0}, m_hasQuirk = false, m_type = 3 '\003', m_isFloat = false}, height = {{m_intValue = 0, m_floatValue = 0, m_calculationValueHandle = 0}, m_hasQuirk = false, m_type = 3 '\003', m_isFloat = false}}}, m_backgroundData = {m_next = std::unique_ptr<WebCore::FillLayer> containing 0x0, m_image = {static isRefPtr = <optimized out>, m_ptr = 0x0}, m_xPosition = {{m_intValue = 0, m_floatValue = 0, m_calculationValueHandle = 0}, m_hasQuirk = false, m_type = 2 '\002', m_isFloat = true}, m_yPosition = {{m_intValue = 0, m_floatValue = 0, m_calculationValueHandle = 0}, m_hasQuirk = false, m_type = 2 '\002', m_isFloat = true}, m_sizeLength = {width = {{m_intValue = 0, m_floatValue = 0, m_calculationValueHandle = 0}, m_hasQuirk = false, m_type = 0 '\000', m_isFloat = false}, height = {{m_intValue = 0, m_floatValue = 0, m_calculationValueHandle = 0}, m_hasQuirk = false, m_type = 0 '\000', m_isFloat = false}}, m_attachment = 0, m_clip = 0, m_origin = 1, m_repeatX = 0, m_repeatY = 0, m_composite = 2, m_sizeType = 3, m_blendMode = 1, m_maskSourceType = 0, m_imageSet = 0, m_attachmentSet = 0, m_clipSet = 0, m_originSet = 0, m_repeatXSet = 0, m_repeatYSet = 0, m_xPosSet = 0, m_yPosSet = 0, m_backgroundXOriginSet = 0, m_backgroundYOriginSet = 0, m_backgroundXOrigin = 3, m_backgroundYOrigin = 0, m_compositeSet = 0, m_blendModeSet = 0, m_maskSourceTypeSet = 0, m_type = 0, m_clipMax = 0}, m_backgroundColor = {static black = 4278190080, static white = 4294967295, static darkGray = 4286611584, static gray = 4288716960, static lightGray = 4290822336, static transparent = 0, static cyan = 4278255615, static yellow = 4294967040, static compositionFill = 4292992341, static extendedColor = 0, static invalidRGBAColor = 1, static validRGBAColorBit = 2, static validRGBAColor = 3, static deletedHashValue = 18446744073709551613, static emptyHashValue = 18446744073709551611, m_colorData = {rgbaAndFlags = 1, extendedColor = 0x1}}, m_cssToLengthConversionData = {m_style = 0x7f600fd1aaa8, m_rootStyle = 0x7f6091938b40, m_renderView = 0x7f60919d0a00, m_zoom = 1, m_useEffectiveZoom = true, m_computingFontSize = false}, m_cascadeLevel = WebCore::UserAgentLevel, m_styleScopeOrdinal = WebCore::Style::ScopeOrdinal::Element, m_authorRollback = std::unique_ptr<WebCore::StyleResolver::CascadedProperties> containing 0x0, m_userRollback = std::unique_ptr<WebCore::StyleResolver::CascadedProperties> containing 0x0, m_selectorFilter = 0x0} collector = {m_element = @0x7f5fd5427ab0, m_authorStyle = @0x7f603b546340, m_userStyle = 0x0, m_selectorFilter = 0x0, m_isPrintStyle = false, m_regionForStyling = 0x0, m_pseudoStyleRequest = {pseudoId = WebCore::NOPSEUDO, scrollbarPart = WebCore::NoPart, scrollbar = 0x0}, m_sameOriginOnly = false, m_mode = WebCore::SelectorChecker::Mode::ResolvingStyle, m_isMatchingSlottedPseudoElements = false, m_isMatchingHostPseudoClass = false, m_keepAliveSlottedPseudoElementRules = {<WTF::VectorBuffer<std::unique_ptr<WTF::Vector<WebCore::RuleData, 1, WTF::CrashOnOverflow, 16>, std::default_delete<WTF::Vector<WebCore::RuleData, 1, WTF::CrashOnOverflow, 16> > >, 0>> = {<WTF::VectorBufferBase<std::unique_ptr<WTF::Vector<WebCore::RuleData, 1, WTF::CrashOnOverflow, 16>, std::default_delete<WTF::Vector<WebCore::RuleData, 1, WTF::CrashOnOverflow, 16> > > >> = {m_buffer = 0x0, m_capacity = 0, m_size = 0}, <No data fields>}, <No data fields>}, m_matchedRules = {<WTF::VectorBuffer<WebCore::MatchedRule, 64>> = {<WTF::VectorBufferBase<WebCore::MatchedRule>> = {m_buffer = 0x7fff4eb593b8, m_capacity = 64, m_size = 0}, 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/usr/src/debug/webkitgtk-2.16.5/Source/WebCore/dom/Document.cpp:1801 disabler = {<No data fields>} suspendWidgetHierarchyUpdates = {static s_widgetHierarchyUpdateSuspendCount = 1} resolver = {m_document = @0x7f6023df7400, m_documentElementStyle = std::unique_ptr<WebCore::RenderStyle> containing 0x0, m_scopeStack = {<WTF::VectorBuffer<WTF::Ref<WebCore::Style::TreeResolver::Scope>, 4>> = {<WTF::VectorBufferBase<WTF::Ref<WebCore::Style::TreeResolver::Scope> >> = {m_buffer = 0x7fff4eb5c990, m_capacity = 4, m_size = 2}, m_inlineBuffer = {{__data = "\000\060\273\372_\177\000", __align = {<No data fields>}}, {__data = "\000B\273\372_\177\000", __align = {<No data fields>}}, {__data = "\240-\205\032`\177\000", __align = {<No data fields>}}, {__data = "\000\000\000\000\000\000\000", __align = {<No data fields>}}}}, <No data fields>}, m_parentStack = {<WTF::VectorBuffer<WebCore::Style::TreeResolver::Parent, 32>> = {<WTF::VectorBufferBase<WebCore::Style::TreeResolver::Parent>> = {m_buffer = 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{__data = "\000\211\265\246_\177\000\000\370\251\321\017`\177\000\000\003\000\000\000\001\000\000", __align = {<No data fields>}}, {__data = '\000' <repeats 16 times>, "@\332\v\001`\177\000", __align = {<No data fields>}}, {__data = "\220\353\336\004`\177", '\000' <repeats 17 times>, __align = {<No data fields>}}, {__data = "\230˵N\377\177", '\000' <repeats 17 times>, __align = {<No data fields>}}, {__data = "\000<%\346\251V\212\271\000\000\000\000\b\000\000\000\300\301\234\221`\177\000", __align = {<No data fields>}}, {__data = "\a\000\000\000\000\000\000\000\a\000\000\000\000\000\000\000@{\026v_\177\000", __align = {<No data fields>}}, {__data = "N\367\243\244`\177\000\000\000t\337#`\177\000\000\000\300\234\221`\177\000", __align = {<No data fields>}}, {__data = "\321|\271[_\177\000\000iB\026\245`\177\000\000\240B(\030`\177\000", __align = {<No data fields>}}, {__data = "\264B\026\245`\177\000\000\240B(\030`\177\000\000\345\352\061\245`\177\000", __align = {<No data fields>}}, {__data = "x\232\235\221`\177\000\000\240B(\030`\177\000\000\000\000\000\000\000\000\000", __align = {<No data fields>}}, {__data = "\245\201-\245`\177\000\000˻\266N\377\177\000\000\000\260\234\221`\177\000", __align = {<No data fields>}}, {__data = "\210Y\230\221`\177\000\000\325\240,\245`\177\000\000\000\360\235\221`\177\000", __align = {<No data fields>}}, {__data = "\200\362\061\234`\177", '\000' <repeats 14 times>, "a\177\000", __align = {<No data fields>}}, {__data = "\000\000\000\000\000\000\000\000\240̵N\377\177\000\000˻\266N\377\177\000", __align = {<No data fields>}}, {__data = "\320̵N\377\177\000\000\313\020\000\000\001\000\000\000\001\000\000\000\000\000\000", __align = {<No data fields>}}, {__data = "\240\307\330U\027V\000\000\200\362\061\234`\177\000\000\320̵N\377\177\000", __align = {<No data fields>}}, {__data = "h\311e\245`\177\000\000\000@\231\221`\177\000\000\000<%\346\251V\212\271", __align = {<No data fields>}}}}, <No data fields>}, m_update = std::unique_ptr<WebCore::Style::Update> containing 0x7f60050dcd80} styleUpdate = std::unique_ptr<WebCore::Style::Update> containing 0x7f6023df7828 protect = {static isRef = <optimized out>, m_ptr = 0x7f603b5f2480} tracingScope = {m_exitCode = StyleRecalcEnd} repaintRegionAccumulator = {m_rootView = {m_ref = {static isRef = <optimized out>, m_ptr = 0x7f60919f5ab0}}, m_wasAccumulatingRepaintRegion = false} animationUpdateBlock = {m_animationController = 0x7f60919f9100} cookie = {m_instrumentingAgents = {static isRefPtr = <optimized out>, m_ptr = 0x0}, m_timelineAgentId = 0} updatedCompositingLayers = false #15 0x00007f60a565bf8e in WebCore::ThreadTimers::sharedTimerFiredInternal() (this=0x7f6091985988) at /usr/src/debug/webkitgtk-2.16.5/Source/WebCore/platform/ThreadTimers.cpp:121 timer = 0x7f6023df7828 fireTime = 4299.528808 timeToQuit = 4299.5788080000002 this = 0x7f6091985988 #16 0x00007f60a254e2ea in WTF::RunLoop::TimerBase::<lambda(gpointer)>::operator() (__closure=0x0, userData=0x7f60a6cfafe8 <WebCore::MainThreadSharedTimer::singleton()::instance+40>) at /usr/src/debug/webkitgtk-2.16.5/Source/WTF/wtf/glib/RunLoopGLib.cpp:162 timer = 0x7f60a6cfafe8 <WebCore::MainThreadSharedTimer::singleton()::instance+40> #17 0x00007f60a254e2ea in WTF::RunLoop::TimerBase::<lambda(gpointer)>::_FUN(gpointer) () at /usr/src/debug/webkitgtk-2.16.5/Source/WTF/wtf/glib/RunLoopGLib.cpp:166 #18 0x00007f609c058247 in g_main_dispatch (context=0x561755d4c160) at gmain.c:3234 dispatch = 0x7f60a254de20 <WTF::<lambda(GSource*, GSourceFunc, gpointer)>::_FUN(GSource *, GSourceFunc, gpointer)> prev_source = 0x0 was_in_call = 0 user_data = 0x7f60a6cfafe8 <WebCore::MainThreadSharedTimer::singleton()::instance+40> callback = 0x7f60a254e2e0 <WTF::RunLoop::TimerBase::<lambda(gpointer)>::_FUN(gpointer)> cb_funcs = 0x7f609c31f280 <g_source_callback_funcs> cb_data = 0x561755e28b00 need_destroy = <optimized out> source = 0x561755e2a790 current = 0x561755d8c7a0 i = 0 #19 0x00007f609c058247 in g_main_context_dispatch (context=context@entry=0x561755d4c160) at gmain.c:3899 #20 0x00007f609c0585e8 in g_main_context_iterate (context=0x561755d4c160, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3972 max_priority = 120 timeout = 0 some_ready = 1 nfds = <optimized out> allocated_nfds = 5 fds = 0x561755dd0ef0 #21 0x00007f609c058902 in g_main_loop_run (loop=0x561755dc45d0) at gmain.c:4168 __func__ = "g_main_loop_run" #22 0x00007f60a254e690 in WTF::RunLoop::run() () at /usr/src/debug/webkitgtk-2.16.5/Source/WTF/wtf/glib/RunLoopGLib.cpp:94 runLoop = @0x7f60919f8000: {<WTF::FunctionDispatcher> = {<WTF::ThreadSafeRefCounted<WTF::FunctionDispatcher>> = {<WTF::ThreadSafeRefCountedBase> = {m_refCount = {<std::__atomic_base<unsigned int>> = {static _S_alignment = 4, _M_i = 1}, <No data fields>}}, <No data fields>}, _vptr.FunctionDispatcher = 0x7f60a2725e90 <vtable for WTF::RunLoop+16>}, m_functionQueueLock = {m_mutex = {__data = {__lock = 0, __count = 0, __owner = 0, __nusers = 0, __kind = 512, __spins = 0, __elision = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = '\000' <repeats 17 times>, "\002", '\000' <repeats 21 times>, __align = 0}}, m_functionQueue = {m_start = 22, m_end = 22, m_buffer = {<WTF::VectorBufferBase<WTF::Function<void()> >> = {m_buffer = 0x7f601b18e000, m_capacity = 136, m_size = 0}, <No data fields>}}, m_mainContext = {m_ptr = 0x561755d4c160}, m_mainLoops = {<WTF::VectorBuffer<WTF::GRefPtr<_GMainLoop>, 0>> = {<WTF::VectorBufferBase<WTF::GRefPtr<_GMainLoop> >> = {m_buffer = 0x7f60919fa100, m_capacity = 16, m_size = 1}, <No data fields>}, <No data fields>}, m_source = {m_ptr = 0x561755dc45f0}} nestedMainLoop = <optimized out> #23 0x00007f60a4dc7fd8 in WebKit::ChildProcessMain<WebKit::WebProcess, WebKit::WebProcessMain>(int, char**) (argc=<optimized out>, argv=0x7fff4eb5cfe8) at /usr/src/debug/webkitgtk-2.16.5/Source/WebKit2/Shared/unix/ChildProcessMain.h:61 childMain = {<WebKit::ChildProcessMainBase> = {_vptr.ChildProcessMainBase = 0x7f60a6b5ad28 <vtable for WebKit::WebProcessMain+16>, m_parameters = {uiProcessName = {m_impl = {static isRefPtr = <optimized out>, m_ptr = 0x0}}, clientIdentifier = {m_impl = {static isRefPtr = <optimized out>, m_ptr = 0x0}}, connectionIdentifier = 45, extraInitializationData = {m_impl = {static m_maxLoad = <optimized out>, static m_minLoad = <optimized out>, m_table = 0x0, m_tableSize = 0, m_tableSizeMask = 0, m_keyCount = 0, m_deletedCount = 0}}}}, <No data fields>} #24 0x00007f60988464da in __libc_start_main (main= 0x56175536dbb0 <main(int, char**)>, argc=2, argv=0x7fff4eb5cfe8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff4eb5cfd8) at ../csu/libc-start.c:295 result = <optimized out> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -3971698949722033258, 94658213895136, 140734513926112, 0, 0, -7263875332044311658, -7345885854335585386}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7f60a6d18dd3 <_dl_init+259>, 0x7f60a6b52148}, data = {prev = 0x0, cleanup = 0x0, canceltype = -1496216109}}} not_first_call = <optimized out> #25 0x000056175536dc0a in _start ()