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From: Breno Leitao <leitao@debian.org>
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Subject: musl segfaulting when compiled with -O2
Date: Tue, 7 Mar 2017 17:32:35 -0300
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Musl package on Debian on ppc64le is broken.

When running any software with it, it segfaults. Doing a little bit of
debugging I found that libc.so is broken.

I got the upstream code, and found that the problme is also
reproducible.

I found that the problem only happen when compiling with -O2 and -O3. If
I compile musl with -O1 or -O0, the problm does not happen.

This is the bt of the code that crashes:

(gdb) bt
#0  0x0000000148b84dc0 in ?? ()
#1  0x0000000048bdb8dc in _dlstart_c (sp=0x3fffc33294b0, dynv=<optimized out>) at ldso/dlstart.c:147
#2  0x0000000048bdebe0 in _dlstart ()

(gdb) up
#1  0x0000000048bdb8dc in _dlstart_c (sp=0x3fffc33294b0, dynv=<optimized out>) at ldso/dlstart.c:147
147		dls2((void *)base, sp);

$ gcc --version
gcc (Debian 6.3.0-5) 6.3.0 20170124

Not sure if this is a GCC issue or a musl issue now.