在下面的崩溃日志中，没有与我的代码相关的库，看起来它们都是系统库，因此无法理解导致崩溃的确切原因，我只想知道如何找出该崩溃原因因为所有这些库都是系统库，所以发生了哪个文件崩溃。将不胜感激。
Thread 6 name: WebThread
Thread 6 Crashed:
0 QuartzCore 0x000000019468b240 CA::CG::ContextDelegate::draw_path_direct_() + 368
1 QuartzCore 0x000000019468b240 CA::CG::ContextDelegate::draw_path_direct_() + 368
2 CoreGraphics 0x0000000191e837ec CGContextDrawPathDirect + 220
3 WebCore 0x0000000199ea38bc WebCore::RenderSVGResourceSolidColor::postApplyResource() + 84
4 WebCore 0x0000000199eac85c WebCore::RenderSVGShape::fillShape() + 124
5 WebCore 0x0000000199eacb88 WebCore::RenderSVGShape::fillStrokeMarkers() + 116
6 WebCore 0x0000000199eace54 WebCore::RenderSVGShape::paint() + 280
7 WebCore 0x0000000199e8d62c WebCore::RenderSVGContainer::paint() + 324
8 WebCore 0x0000000199e8d62c WebCore::RenderSVGContainer::paint() + 324
9 WebCore 0x0000000199eab3dc WebCore::RenderSVGRoot::paintReplaced() + 1016
10 WebCore 0x0000000199dcfcf8 WebCore::RenderReplaced::paint() + 1152
11 WebCore 0x0000000199d38d18 WebCore::RenderElement::paintAsInlineBlock() + 184
12 WebCore 0x0000000199cb569c WebCore::InlineElementBox::paint() + 128
13 WebCore 0x0000000199cbb9b4 WebCore::InlineFlowBox::paint() + 1092
14 WebCore 0x0000000199e2bef8 WebCore::RootInlineBox::paint() + 52
15 WebCore 0x0000000199daf2d8 WebCore::RenderLineBoxList::paint() + 844
16 WebCore 0x0000000199cce320 WebCore::RenderBlock::paintObject() + 692
17 WebCore 0x0000000199ccdb60 WebCore::RenderBlock::paint() + 264
18 WebCore 0x0000000199d8a2b8 WebCore::RenderLayer::paintForegroundForFragmentsWithPhase() + 424
19 WebCore 0x0000000199d87e74 WebCore::RenderLayer::paintForegroundForFragments() + 444
20 WebCore 0x0000000199d855bc WebCore::RenderLayer::paintLayerContents() + 2556
21 WebCore 0x0000000199d9af28 WebCore::RenderLayerBacking::paintIntoLayer() + 604
22 WebCore 0x0000000199d9b24c WebCore::RenderLayerBacking::paintContents() + 564
23 WebCore 0x0000000199b95464 WebCore::GraphicsLayer::paintGraphicsLayerContents() + 124
24 WebCore 0x0000000199bbd704 WebCore::GraphicsLayerCA::platformCALayerPaintContents() + 320
25 WebCore 0x0000000198d43068 WebCore::PlatformCALayer::drawLayerContents() + 368
26 WebCore 0x0000000199bd13f0 WebCore::TileGrid::platformCALayerPaintContents() + 208
27 WebCore 0x00000001989d9d5c -[WebSimpleLayer drawInContext:] + 200
28 QuartzCore 0x000000019459ad60 CABackingStoreUpdate_ + 464
29 QuartzCore 0x00000001946bf11c ___ZN2CA5Layer8display_Ev_block_invoke + 52
30 QuartzCore 0x00000001946b7e7c -[CALayer _display] + 1540
31 WebCore 0x00000001989d934c -[WebSimpleLayer display] + 60
32 QuartzCore 0x000000019461caa4 CA::Context::commit_transaction() + 548
33 QuartzCore 0x000000019464b2f4 CA::Transaction::commit() + 608
34 QuartzCore 0x000000019464c15c CA::Transaction::observer_callback() + 92
35 CoreFoundation 0x0000000190064b94 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
36 CoreFoundation 0x000000019005f828 __CFRunLoopDoObservers + 412
37 CoreFoundation 0x000000019005fdc8 __CFRunLoopRun + 1264
38 CoreFoundation 0x000000019005f5b8 CFRunLoopRunSpecific + 436
39 WebCore 0x0000000198e86ba4 RunWebThread() + 592
40 libsystem_pthread.dylib 0x000000018fcf02fc _pthread_body + 128
41 libsystem_pthread.dylib 0x000000018fcf025c _pthread_start + 48
42 libsystem_pthread.dylib 0x000000018fcf3d08 thread_start + 4