It seems webkit has a JIT that generates assembler code at runtime.  The
crash happens while executing one of those generated blocks of code.

Since there is no debug or unwind information, or even basic symbol
information, available for such generated code, there really is not much
GDB can do here.

In theory, recent GDBs provide an interface for a JIT to register symbol
information for generated code at runtime, but it appears the webkit JIT
does make use of this.

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https://bugs.launchpad.net/bugs/728216

Title:
  GDB fails to get a valid backtrace while debugging a Webkit SIGSEGV

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