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From: Rich Felker <dalias@libc.org>
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Subject: Re: _Unwind_Backtrace crashes
Date: Thu, 27 Aug 2015 15:14:30 -0400
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On Thu, Aug 27, 2015 at 11:55:24AM -0700, Andy Lutomirski wrote:
> This works on glibc.  It aborts on musl on i386 using the latest git version.
> 
> I suspect it's because whatever calls main isn't properly annotated,
> but I don't know how to debug this without rebuilding gcc, which is
> kind of a mess.

I can't reproduce the crash. The program runs and produces the output:

Unwind directly
Unwind from signal handler
In signal handler.  Trying to unwind.
OK

I tried pre-CFI-patch and post-CFI-patch musl git, static and dynamic
linking. Perhaps it's GCC version-specific? I'm using 4.7.3 on my i386
system.

Rich