[Webkit-unassigned] [Bug 160337] Crash in JavaScriptCore GC when using JSC on dispatch queues (thread_get_state returns NULL stack pointer)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160337

--- Comment #4 from Ben Nham <nham at fb.com> ---
Actually looking at this a bit more, I still don't think thread_get_register_pointer_values will do the right thing. For instance, on x86_64, it returns SP - 128 (taking in to account the red zone underneath the stack pointer):

#elif defined(__x86_64__)
    if (sp) *sp = state.__rsp - 128 /* redzone */;

This means that thread_get_register_pointer_values would actually return -128 when state.__rsp is 0x0, which is also an invalid stack pointer.

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