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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Crash in JavaScriptCore GC when using JSC on dispatch queues (thread_get_state returns NULL stack pointer)"
href="https://bugs.webkit.org/show_bug.cgi?id=160337#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Crash in JavaScriptCore GC when using JSC on dispatch queues (thread_get_state returns NULL stack pointer)"
href="https://bugs.webkit.org/show_bug.cgi?id=160337">bug 160337</a>
from <span class="vcard"><a class="email" href="mailto:nham@fb.com" title="Ben Nham <nham@fb.com>"> <span class="fn">Ben Nham</span></a>
</span></b>
<pre>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.</pre>
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