Others have reported that compiling with JIT disabled fixes the issue. Might it be an idea to alter the standard Debian package to patch Webkit/Source/JavaScriptCore/wtf/Platform.h so that ENABLE_CLASSIC_INTERPRETER is always set to 1? Then users encountering crashes can set JavaScriptCoreUseJIT=0 as an environment variable to fall back to the interpreter. This makes it much easier to verify a crash actually is related to the JIT. (See JSGlobalData.cpp for the code that checks JavascriptCoreUseJIT).
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