[Webkit-unassigned] [Bug 195141] New: New string formatting triggers crashes in compositing logging code
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Wed Feb 27 20:13:46 PST 2019
https://bugs.webkit.org/show_bug.cgi?id=195141
Bug ID: 195141
Summary: New string formatting triggers crashes in compositing
logging code
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: WebKit Misc.
Assignee: webkit-unassigned at lists.webkit.org
Reporter: simon.fraser at apple.com
When compositing logging is enabled (-WebCoreLogging="Compositing") in the iOS simulator in debug, then the web process crashes:
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_platform.dylib 0x00000004e0363d09 _platform_memmove$VARIANT$Haswell + 41
1 com.apple.WebCore 0x00000004e99fa637 void WTF::StringImpl::copyCharacters<unsigned char>(unsigned char*, unsigned char const*, unsigned int) + 71 (StringImpl.h:1089)
2 com.apple.WebCore 0x00000004e9bb46a4 void WTF::StringTypeAdapter<WTF::HexNumberBuffer, void>::writeTo<unsigned char>(unsigned char*) const + 68 (HexNumber.h:104)
3 com.apple.WebCore 0x00000004ecb93e7e void WTF::StringTypeAdapter<WTF::PaddingSpecification<WTF::StringTypeAdapter<WTF::HexNumberBuffer, void> >, void>::writeTo<unsigned char>(unsigned char*) const + 174 (StringConcatenate.h:230)
4 com.apple.WebCore 0x00000004ecb92ba4 void WTF::makeStringAccumulator<unsigned char, WTF::StringTypeAdapter<WTF::PaddingSpecification<WTF::StringTypeAdapter<WTF::HexNumberBuffer, void> >, void>, WTF::StringTypeAdapter<char const*, void>, WTF::StringTypeAdapter<unsigned long long, void>, WTF::StringTypeAdapter<char const*, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char const*, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char const*, void> >(unsigned char*, WTF::StringTypeAdapter<WTF::PaddingSpecification<WTF::StringTypeAdapter<WTF::HexNumberBuffer, void> >, void>, WTF::StringTypeAdapter<char const*, void>, WTF::StringTypeAdapter<unsigned long long, void>, WTF::StringTypeAdapter<char const*, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char const*, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char const*, void>) + 164 (StringConcatenate.h:258)
5 com.apple.WebCore 0x00000004ecb92495 WTF::String WTF::tryMakeStringFromAdapters<WTF::StringTypeAdapter<WTF::PaddingSpecification<WTF::StringTypeAdapter<WTF::HexNumberBuffer, void> >, void>, WTF::StringTypeAdapter<char const*, void>, WTF::StringTypeAdapter<unsigned long long, void>, WTF::StringTypeAdapter<char const*, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char const*, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char const*, void> >(WTF::StringTypeAdapter<WTF::PaddingSpecification<WTF::StringTypeAdapter<WTF::HexNumberBuffer, void> >, void>, WTF::StringTypeAdapter<char const*, void>, WTF::StringTypeAdapter<unsigned long long, void>, WTF::StringTypeAdapter<char const*, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char const*, void>, WTF::StringTypeAdapter<WTF::FormattedNumber, void>, WTF::StringTypeAdapter<char const*, void>) + 1685 (StringConcatenate.h:279)
6 com.apple.WebCore 0x00000004ecb91dd8 WTF::String WTF::tryMakeString<WTF::PaddingSpecification<WTF::StringTypeAdapter<WTF::HexNumberBuffer, void> >, char const*, unsigned long long, char const*, WTF::FormattedNumber, char, WTF::FormattedNumber, char, WTF::FormattedNumber, char, WTF::FormattedNumber, char const*, WTF::FormattedNumber, char const*>(WTF::PaddingSpecification<WTF::StringTypeAdapter<WTF::HexNumberBuffer, void> >, char const*, unsigned long long, char const*, WTF::FormattedNumber, char, WTF::FormattedNumber, char, WTF::FormattedNumber, char, WTF::FormattedNumber, char const*, WTF::FormattedNumber, char const*) + 648 (StringConcatenate.h:295)
7 com.apple.WebCore 0x00000004ecb6da61 WTF::String WTF::makeString<WTF::PaddingSpecification<WTF::StringTypeAdapter<WTF::HexNumberBuffer, void> >, char const*, unsigned long long, char const*, WTF::FormattedNumber, char, WTF::FormattedNumber, char, WTF::FormattedNumber, char, WTF::FormattedNumber, char const*, WTF::FormattedNumber, char const*>(WTF::PaddingSpecification<WTF::StringTypeAdapter<WTF::HexNumberBuffer, void> >, char const*, unsigned long long, char const*, WTF::FormattedNumber, char, WTF::FormattedNumber, char, WTF::FormattedNumber, char, WTF::FormattedNumber, char const*, WTF::FormattedNumber, char const*) + 945 (StringConcatenate.h:302)
8 com.apple.WebCore 0x00000004ecb6d013 WebCore::RenderLayerCompositor::logLayerInfo(WebCore::RenderLayer const&, char const*, int) + 1155 (RenderLayerCompositor.cpp:1327)
9 com.apple.WebCore 0x00000004ecb6a05d WebCore::RenderLayerCompositor::updateBackingAndHierarchy(WebCore::RenderLayer&, WTF::Vector<WTF::Ref<WebCore::GraphicsLayer, WTF::DumbPtrTraits<WebCore::GraphicsLayer> >, 0ul, WTF::CrashOnOverflow, 16ul>&, WebCore::ScrollingTreeState&, WTF::OptionSet<WebCore::RenderLayerCompositor::UpdateLevel>, int) + 765 (RenderLayerCompositor.cpp:1202)
10 com.apple.WebCore 0x00000004ecb6a448 WebCore::RenderLayerCompositor::updateBackingAndHierarchy(WebCore::RenderLayer&, WTF::Vector<WTF::Ref<WebCore::GraphicsLayer, WTF::DumbPtrTraits<WebCore::GraphicsLayer> >, 0ul, WTF::CrashOnOverflow, 16ul>&, WebCore::ScrollingTreeState&, WTF::OptionSet<WebCore::RenderLayerCompositor::UpdateLevel>, int) + 1768 (RenderLayerCompositor.cpp:1236)
11 com.apple.WebCore 0x00000004ecb6a448 WebCore::RenderLayerCompositor::updateBackingAndHierarchy(WebCore::RenderLayer&, WTF::Vector<WTF::Ref<WebCore::GraphicsLayer, WTF::DumbPtrTraits<WebCore::GraphicsLayer> >, 0ul, WTF::CrashOnOverflow, 16ul>&, WebCore::ScrollingTreeState&, WTF::OptionSet<WebCore::RenderLayerCompositor::UpdateLevel>, int) + 1768 (RenderLayerCompositor.cpp:1236)
12 com.apple.WebCore 0x00000004ecb3a55c WebCore::RenderLayerCompositor::updateCompositingLayers(WebCore::CompositingUpdateType, WebCore::RenderLayer*) + 2908 (RenderLayerCompositor.cpp:762)
Somehow HexNumberBuffer ends up with a bad length:
(lldb) fr va m_padding.underlyingAdapter.m_buffer
(const WTF::HexNumberBuffer &) m_padding.underlyingAdapter.m_buffer = 0x00007ffeebc8aa80: {
characters = (__elems_ = "0.000")
length = 631693656
}
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