291322 2025-04-09 09:29:41 -0700 Web Inspector: InspectorCanvasAgent::didChangeCanvasMemory violates assertion 2025-04-16 09:30:13 -0700 1 1 1 Unclassified WebKit Web Inspector Other All All NEW https://bugs.webkit.org/show_bug.cgi?id=290042 InRadar P2 Normal --- 1 deleted_user webkit-unassigned inspector-bugzilla-changes webkit-bug-importer oldest_to_newest 2109958 0 deleted_user 2025-04-09 09:29:41 -0700 STR: 1. Download https://github.com/WebKit/WebKit/pull/42688/files#diff-569aa52dd7b76b7c6aa31cc120f8ec75356e60777ab397ea10aca371cde4b597. 2. Open it with GTK's MiniBrowser with a debug build. 3. Open the Graphics tab of Web Inspector. 4. Attach gdb to the WebKitWebProcess. 5. Reload the MiniBrowsers tab. 6. Click on the canvas in the Graphics tab of Web inspector. Backtrace: ``` Thread 1 "WebKitWebProces" received signal SIGSEGV, Segmentation fault. WTFCrash () at /host/home/mirko/work/code/WebKit/Source/WTF/wtf/Assertions.cpp:367 367 *(int *)(uintptr_t)0xbbadbeef = 0; (gdb) bt #0 WTFCrash () at /host/home/mirko/work/code/WebKit/Source/WTF/wtf/Assertions.cpp:367 #1 0x0000736c4970967f in WTFCrashWithInfo () at /host/home/mirko/work/code/WebKit/WebKitBuild/GTK/Debug/WTF/Headers/wtf/Assertions.h:931 #2 0x0000736c506d3fbd in WebCore::InspectorCanvasAgent::didChangeCanvasMemory (this=0x736c1a0e4340, context=...) at /host/home/mirko/work/code/WebKit/Source/WebCore/inspector/agents/InspectorCanvasAgent.cpp:376 #3 0x0000736c5062496a in WebCore::InspectorInstrumentation::didChangeCanvasMemoryImpl (instrumentingAgents=..., context=...) at /host/home/mirko/work/code/WebKit/Source/WebCore/inspector/InspectorInstrumentation.cpp:1118 #4 0x0000736c5016b01b in WebCore::InspectorInstrumentation::didChangeCanvasMemory (context=...) at /host/home/mirko/work/code/WebKit/Source/WebCore/inspector/InspectorInstrumentation.h:1494 #5 0x0000736c5016c9b9 in WebCore::CanvasBase::setImageBuffer (this=0x736b8a008ef8, buffer=...) at /host/home/mirko/work/code/WebKit/Source/WebCore/html/CanvasBase.cpp:274 #6 0x0000736c501d86e6 in WebCore::HTMLCanvasElement::setImageBufferAndMarkDirty (this=0x736b8a008e30, buffer=...) at /host/home/mirko/work/code/WebKit/Source/WebCore/html/HTMLCanvasElement.cpp:902 #7 0x0000736c5042788b in WebCore::PlaceholderRenderingContext::setPlaceholderBuffer (this=0x736b8a006050, buffer=...) at /host/home/mirko/work/code/WebKit/Source/WebCore/html/canvas/PlaceholderRenderingContext.cpp:114 #8 0x0000736c5042731b in operator() (__closure=0x736c1a372d48) at /host/home/mirko/work/code/WebKit/Source/WebCore/html/canvas/PlaceholderRenderingContext.cpp:73 #9 0x0000736c504640a2 in WTF::Detail::CallableWrapper<WebCore::PlaceholderRenderingContextSource::setPlaceholderBuffer(WebCore::ImageBuffer&)::<lambda()>, void>::call(void) ``` Violated assertion: https://searchfox.org/wubkat/rev/95b8a67e3715e5f442cadaf3532e007c8c7d2603/Source/WebCore/inspector/agents/InspectorCanvasAgent.cpp#376 2111312 1 webkit-bug-importer 2025-04-16 09:30:13 -0700 <rdar://problem/149393969>