[lldb-dev] [PATCH] Fix NULL unwinder dereference in StackFrameList

Jason Molenda jmolenda at apple.com
Fri Nov 22 15:56:02 PST 2013

For what it's worth, the unwinder is picked in Thread::GetStackFrameStatus() - we have a "last resort" unwinder for Apple triples that tries to walk the stack by following a frame chain for i386 or x86_64.  Might be good to fall back to that even if the triple isn't -apple-.

(wouldn't have helped in this case where you didn't even have an architecture, let alone an OS, defined, but fwiw.)

On Nov 22, 2013, at 12:37 PM, Todd Fiala <tfiala at google.com> wrote:

> Hi all,
> I'm attaching a proposed patch to fix an issue where lldb will seg fault if for some reason there is no unwinder when StackFrameList::GetFramesUpTo() is called.
> The scenario where I'm hitting it is more fundamentally broken (the triple is unknown) - this small patch is just to stop lldb from crashing.
> Thanks!
> Sincerely,
> Todd Fiala
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