164925 2016-11-18 08:18:04 -0800 [GTK] Crash in WebCore::TextureMapperTiledBackingStore::createOrDestroyTilesIfNeeded allocating too-large vector 2016-11-30 05:53:50 -0800 1 1 1 Unclassified WebKit WebKitGTK WebKit Nightly Build PC Linux NEW https://bugzilla.redhat.com/show_bug.cgi?id=1372908 P2 Normal --- 1 mcatanzaro webkit-unassigned bugs-noreply cgarcia mcatanzaro oldest_to_newest 1252676 0 mcatanzaro 2016-11-18 08:18:04 -0800 Only two reports of this one. Web process crash in WebCore::TextureMapperTiledBackingStore::createOrDestroyTilesIfNeeded inside WTF::Vector<WebCore::FloatRect, 0ul, WTF::CrashOnOverflow, 16ul>::expandCapacity. It's crashing on overflow here: if (newCapacity > std::numeric_limits<unsigned>::max() / sizeof(T)) CRASH(); Curiously, the function accepts a size_t newCapacity parameter, but the limit it's checking is for smaller unsigned int. Long backtrace downstream. Short version: Thread 1 (Thread 0x7fa365b88ac0 (LWP 25221)): #0 0x00007fa36318a67c in WTFCrash() () at /usr/src/debug/webkitgtk-2.12.4/Source/WTF/wtf/Assertions.cpp:322 #1 0x00007fa363a91df6 in WTF::Vector<WebCore::FloatRect, 0ul, WTF::CrashOnOverflow, 16ul>::expandCapacity(unsigned long) (newCapacity=<optimized out>, this=0x7ffdaef91720) at /usr/src/debug/webkitgtk-2.12.4/Source/WTF/wtf/Vector.h:266 sizeToAllocate = <optimized out> this = 0x7ffdaef91720 #2 0x00007fa363a91df6 in WTF::Vector<WebCore::FloatRect, 0ul, WTF::CrashOnOverflow, 16ul>::expandCapacity(unsigned long) (newCapacity=<optimized out>, this=0x7ffdaef91720) at /usr/src/debug/webkitgtk-2.12.4/Source/WTF/wtf/Vector.h:1094 this = 0x7ffdaef91720 #3 0x00007fa363a91df6 in WTF::Vector<WebCore::FloatRect, 0ul, WTF::CrashOnOverflow, 16ul>::expandCapacity(unsigned long) (this=0x7ffdaef91720, newMinCapacity=<optimized out>) at /usr/src/debug/webkitgtk-2.12.4/Source/WTF/wtf/Vector.h:955 #4 0x00007fa364a58100 in WebCore::TextureMapperTiledBackingStore::createOrDestroyTilesIfNeeded(WebCore::FloatSize const&, WebCore::IntSize const&, bool) (ptr=0x7ffdaef91740, newMinCapacity=<optimized out>, this=0x7ffdaef91720) at /usr/src/debug/webkitgtk-2.12.4/Source/WTF/wtf/Vector.h:962 index = <optimized out> tileRect = {m_location = {m_x = 3690000, m_y = 26344000}, m_size = {m_width = 2000, m_height = 2000}} x = <optimized out> y = 26344000 scaledSize = {m_width = 33554432, m_height = 33554432} tileRectsToAdd = {<WTF::VectorBuffer<WebCore::FloatRect, 0ul>> = {<WTF::VectorBufferBase<WebCore::FloatRect>> = {m_buffer = 0x7f9e69800000, m_capacity = 221001661, m_size = 221001661}, <No data fields>}, <No data fields>} tileIndicesToRemove = {<WTF::VectorBuffer<int, 0ul>> = {<WTF::VectorBufferBase<int>> = {m_buffer = 0x0, m_capacity = 0, m_size = 0}, <No data fields>}, <No data fields>} hasAlpha = <optimized out> tileSize = @0x7ffdaef917d0: {m_width = 2000, m_height = 2000} size = <optimized out> this = 0x7fa29e59e780 1254748 1 cgarcia 2016-11-30 05:53:50 -0800 We don't even use TextureMapperTiledBackingStore anymore since 2.14. Well only when building without coord graphics.