[webkit-dev] jsc bus error EXC_BAD_ACCESS with jsc-only build on Mac

Laurence Rowe l at lrowe.co.uk
Mon Mar 27 23:11:57 PDT 2023 

Hi, I’m trying to build jsc on my M1 Mac following the instructions at
https://trac.webkit.org/wiki/JSCOnly and https://webkit.org/getting-started/ .
However when I run the built binary it exits immediately with a bus error
which lldb shows to be EXC_BAD_ACCESS.

lrowe at Laurences-MacBook-Air WebKit % git reset --hard origin/main
HEAD is now at b2362a5d6b [UI-side compositing] Safari occasionally crashes
when scrolling underneath `NSScrollerImpPair`
https://bugs.webkit.org/show_bug.cgi?id=254484 rdar://107139674
lrowe at Laurences-MacBook-Air WebKit % git clean -Xf
lrowe at Laurences-MacBook-Air WebKit % sudo xcode-select -s
/Applications/Xcode.app/Contents/Developer
lrowe at Laurences-MacBook-Air WebKit % Tools/Scripts/build-jsc --jsc-only
# build log below
lrowe at Laurences-MacBook-Air WebKit % ./WebKitBuild/Release/bin/jsc
zsh: bus error  ./WebKitBuild/Release/bin/jsc

lrowe at Laurences-MacBook-Air WebKit % lldb ./WebKitBuild/Release/bin/jsc
(lldb) target create "./WebKitBuild/Release/bin/jsc"
Current executable set to
'/Users/lrowe/scratch/WebKit/WebKitBuild/Release/bin/jsc' (arm64).
(lldb) run
Process 73062 launched:
'/Users/lrowe/scratch/WebKit/WebKitBuild/Release/bin/jsc' (arm64)
Process 73062 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
(code=2, address=0x10d5ac000)
    frame #0: 0x00000001a1b43f78 libsystem_platform.dylib`_platform_memmove
+ 168
libsystem_platform.dylib`:
->  0x1a1b43f78 <+168>: stp    q2, q3, [x0]
    0x1a1b43f7c <+172>: subs   x2, x2, #0x40
    0x1a1b43f80 <+176>: b.ls   0x1a1b43f9c               ; <+204>
    0x1a1b43f84 <+180>: stp    q0, q1, [x3]
Target 0: (jsc) stopped.

Versions:

   - WebKit main (b2362a5d6b)
   - Xcode 14.2 (14C18)
   - macOS 13.2.1
   - CMake.app 3.26.1 (not mentioned at https://webkit.org/build-tools/ but
   required)


I’ve also tried variously with Xcode command line tools, homebrew cmake,
WebKit tag WebKit-7615.1.26.10.23, and adding the —debug flag to the build
but I see the same error.

Is there anything else I should be doing to build jsc?

Thanks,

Laurence Rowe


# build log
+  cmake --build /Users/lrowe/scratch/WebKit/WebKitBuild/Release --config
Release -- jsc testb3 testair testapi testmasm testdfg -j8
[  0%] Built target JavaScriptCore_CopyHeaders
[  1%] Built target JavaScriptCoreSharedScripts
[  1%] Built target JSCBuiltins
[  1%] Built target Bytecodes
[ 35%] Built target WTF_CopyHeaders
[ 38%] Built target bmalloc_CopyHeaders
[ 46%] Built target bmalloc
[ 53%] Built target WTF
[ 53%] Built target LLIntSettingsExtractor
[ 53%] Building CXX object
Source/JavaScriptCore/CMakeFiles/LLIntOffsetsExtractor.dir/llint/LLIntOffsetsExtractor.cpp.o
[ 53%] Linking CXX executable ../../bin/LLIntOffsetsExtractor
[ 53%] Built target LLIntOffsetsExtractor
[ 53%] Generating ../../JavaScriptCore/DerivedSources/LLIntAssembly.h
[ 53%] Building CXX object
Source/JavaScriptCore/CMakeFiles/LowLevelInterpreterLib.dir/llint/LowLevelInterpreter.cpp.o
[ 53%] Built target LowLevelInterpreterLib
[ 53%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-f0a787a9-7.cpp.o
[ 53%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-f0a787a9-11.cpp.o
[ 53%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-bfc896e1-4.cpp.o
[ 53%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-bfc896e1-3.cpp.o
[ 53%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-bfc896e1-9.cpp.o
[ 53%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/dfg/DFGSpeculativeJIT.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/dfg/DFGSpeculativeJIT32_64.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/dfg/DFGSpeculativeJIT64.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-bfc896e1-14.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-02aa2997-1.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/ftl/FTLLowerDFGToB3.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-ee8a7a7a-3.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-0e543b66-1.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-3a3c4ec0-1.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-f2e18ffc-21.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-f2e18ffc-34.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-f2e18ffc-42.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/wasm/WasmAirIRGenerator32_64.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/wasm/WasmAirIRGenerator64.cpp.o
[ 54%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-0284c6ac-1.cpp.o
[ 55%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/wasm/WasmBBQJIT.cpp.o
[ 55%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-15db4ad9-1.cpp.o
[ 55%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-15db4ad9-2.cpp.o
[ 55%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-15db4ad9-3.cpp.o
[ 55%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-15db4ad9-4.cpp.o
[ 55%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-15db4ad9-5.cpp.o
[ 55%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-15db4ad9-6.cpp.o
[ 55%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-15db4ad9-7.cpp.o
[ 55%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-15db4ad9-8.cpp.o
[ 55%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-15db4ad9-9.cpp.o
[ 55%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-15db4ad9-10.cpp.o
[ 55%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-15db4ad9-11.cpp.o
[ 55%] Building CXX object
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-15db4ad9-12.cpp.o
[ 55%] Linking CXX shared library
../../lib/JavaScriptCore.framework/JavaScriptCore
[ 66%] Built target JavaScriptCore
[ 66%] Generating
../../JavaScriptCore/PrivateHeaders/JavaScriptCore/WasmCallee.h
[100%] Built target JavaScriptCore_CopyPrivateHeaders
[100%] Building CXX object
Source/JavaScriptCore/shell/CMakeFiles/jsc.dir/__/jsc.cpp.o
[100%] Linking CXX executable ../../../bin/jsc
[100%] Built target jsc
[  0%] Built target Bytecodes
[  1%] Built target JavaScriptCoreSharedScripts
[  1%] Built target JavaScriptCore_CopyHeaders
[  1%] Built target JSCBuiltins
[ 21%] Built target WTF_CopyHeaders
[ 38%] Built target bmalloc_CopyHeaders
[ 46%] Built target bmalloc
[ 53%] Built target WTF
[ 53%] Built target LLIntSettingsExtractor
[ 53%] Built target LLIntOffsetsExtractor
[ 53%] Built target LowLevelInterpreterLib
[ 66%] Built target JavaScriptCore
[100%] Built target JavaScriptCore_CopyPrivateHeaders
[100%] Linking CXX executable ../../../bin/testb3
[100%] Built target testb3
[  1%] Built target JavaScriptCoreSharedScripts
[  1%] Built target JavaScriptCore_CopyHeaders
[  1%] Built target Bytecodes
[ 18%] Built target WTF_CopyHeaders
[ 18%] Built target JSCBuiltins
[ 38%] Built target bmalloc_CopyHeaders
[ 46%] Built target bmalloc
[ 53%] Built target WTF
[ 53%] Built target LLIntSettingsExtractor
[ 53%] Built target LLIntOffsetsExtractor
[ 53%] Built target LowLevelInterpreterLib
[ 66%] Built target JavaScriptCore
[100%] Built target JavaScriptCore_CopyPrivateHeaders
[100%] Linking CXX executable ../../../bin/testair
[100%] Built target testair
[  0%] Built target Bytecodes
[  0%] Built target JavaScriptCore_CopyHeaders
[  1%] Built target JavaScriptCoreSharedScripts
[  1%] Built target JSCBuiltins
[ 37%] Built target WTF_CopyHeaders
[ 38%] Built target bmalloc_CopyHeaders
[ 45%] Built target bmalloc
[ 53%] Built target WTF
[ 53%] Built target LLIntSettingsExtractor
[ 53%] Built target LLIntOffsetsExtractor
[ 53%] Built target LowLevelInterpreterLib
[ 65%] Built target JavaScriptCore
[ 98%] Built target JavaScriptCore_CopyPrivateHeaders
[ 98%] Linking CXX executable ../../../bin/testapi
[100%] Built target testapi
[  1%] Built target JavaScriptCoreSharedScripts
[  1%] Built target JavaScriptCore_CopyHeaders
[  1%] Built target JSCBuiltins
[  1%] Built target Bytecodes
[ 21%] Built target bmalloc_CopyHeaders
[ 38%] Built target WTF_CopyHeaders
[ 45%] Built target bmalloc
[ 53%] Built target WTF
[ 53%] Built target LLIntSettingsExtractor
[ 53%] Built target LLIntOffsetsExtractor
[ 53%] Built target LowLevelInterpreterLib
[ 65%] Built target JavaScriptCore
[ 98%] Built target JavaScriptCore_CopyPrivateHeaders
[100%] Linking CXX executable ../../../bin/testmasm
[100%] Built target testmasm
[  1%] Built target JavaScriptCoreSharedScripts
[  1%] Built target JavaScriptCore_CopyHeaders
[  1%] Built target JSCBuiltins
[  1%] Built target Bytecodes
[ 36%] Built target WTF_CopyHeaders
[ 38%] Built target bmalloc_CopyHeaders
[ 46%] Built target bmalloc
[ 53%] Built target WTF
[ 53%] Built target LLIntSettingsExtractor
[ 53%] Built target LLIntOffsetsExtractor
[ 53%] Built target LowLevelInterpreterLib
[ 66%] Built target JavaScriptCore
[100%] Built target JavaScriptCore_CopyPrivateHeaders
[100%] Linking CXX executable ../../../bin/testdfg
[100%] Built target testdfg

====================================================================
 JavaScriptCore is now built (01m:00s).
====================================================================
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