WebKit crash (WebContent)

Question

roee84 OP

Created Dec ’21

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I've developed a system-extension for macOS (Packet Tunnel Provider, Developer ID, distribution outside the App Store).

There's a scenario where I want to present some webpages with the WebKit. It works fine, but on of my testing Macs the webpage display the page for a split second, and then becomes white. I saw that the WebKit crashed, but I'm not sure why. I attached the crash report.

Also, at the crash report, I saw this: "is_first_party":1,"bug_type":"309"

Did my application cause this crash? Any advise on how to debug it or on how can I prevent if from happening?

com.apple.WebKit.WebContent-2021-12-12-063048.txt

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Answer 1

DTS Engineer OP

Apple

Dec ’21

Well, that’s an interesting crash. Consider this:

Exception Type:        EXC_BAD_ACCESS (SIGKILL (Code Signature Invalid))

The web content process crashed due to a code signing problem. Now look at this backtrace:

Thread 0  Dispatch queue: com.apple.main-thread
0   libGLProgrammability.dylib … glvmOperationMOV + 116 …
1   libGLProgrammability.dylib … glvmInterpretFPTransformFourInner + 3086 …
2   libGLProgrammability.dylib … glvmInterpretFPTransformFour + 3782 …
3   GLRendererFloat            … gldLLVMFPTransform + 638 …
4   GLRendererFloat            … gldLLVMVecPolyRender + 23252 …
5   GLEngine                   … gleLLVMVecPrimMultiRender + 10752 …
6   GLEngine                   … glDrawArrays_GL3Exec + 1016 …
7   libANGLE-shared.dylib      … rx::ContextGL::drawArrays(gl::Context con…
8   libANGLE-shared.dylib      … gl::DrawArrays(unsigned int, int, int) + …
9   com.apple.WebCore          … WebCore::GraphicsContextGLOpenGL::drawArr…
10  com.apple.WebCore          … WebCore::WebGLRenderingContextBase::drawA…
11  com.apple.WebCore          … WebCore::jsWebGLRenderingContextPrototype…
12                             …
13  com.apple.JavaScriptCore   … llint_entry + 116352
…
84  com.apple.JavaScriptCore   … llint_entry + 116352
85  com.apple.JavaScriptCore   … vmEntryToJavaScript + 216
86  com.apple.JavaScriptCore   … JSC::Interpreter::executeCall(JSC::JSGlob…
…

This isn’t the usual code signing crash, where the process crashes on launch. Rather, the process has been running for a while and has then crashed. There’s a couple of standard reasons for this:

Something invalidate a page of existing code.
The process generates code, like with a JIT, and has problems with that.

Frames 85 through 13 suggest that this is the latter but, honestly, I don’t know enough about WebKit to say for sure.

Regardless, I can’t come up with any theories as to how your NE sysex packet tunnel provider could have caused this.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

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Answer 2

roee84 OP

Dec ’21

Thanks eskimo!

Two more questions:

Should I submit a bug report?
I guess I have nothing to do with "The process generates code, like with a JIT, and has problems with that.",

but if it's the first reason - "Something invalidate a page of existing code" - is this 'something' can be my application? Or again, it's a case where I can't do anything like the first option?

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