[Libunwind-devel] Sigsegv while traversing the call-stack in a power8 system

[Harald Servat]

Hello,

  the attached program fails to run with a sigsegv on a IBM 
power8-based system while it works flawlessly on Intel x86-64 and on a 
ARM v7l.

  I compiled the code against libunwind downloaded from git on October 
13th using the following command:

# gcc --version
gcc (Ubuntu 4.9.1-16ubuntu6) 4.9.1

# gcc -g traverse_callers.c -o traverse_callers -L 
$HOME/libunwind/git/lib64/ -lunwind -Wl,-rpath 
-Wl,$HOME/libunwind/git/lib64/ -I $HOME/libunwind/git/include -O0

  The debugger says:

(gdb) run
Starting program: ./traverse_callers

Program received signal SIGSEGV, Segmentation fault.
_ULppc64_step (cursor=0x3fffffffec08) at ppc64/Gstep.c:442
442         if (*inst == (0xE8410000 + 24)) {
(gdb) where
#0  _ULppc64_step (cursor=0x3fffffffec08) at ppc64/Gstep.c:442
#1  0x0000000010000810 in traverse_callstack () at traverse_callers.c:16
#2  0x000000001000089c in main (argc=1, argv=0x3ffffffff928) at 
traverse_callers.c:23

Thank you


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traverse_callers.c
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