Re: Dwarf unwind test failures on various arches

[Kurt Roeckx <kurt at roeckx dot be>]

On Tue, Apr 22, 2014 at 01:45:43PM +0200, Mark Wielaard wrote:
> On Mon, 2014-04-21 at 23:40 +0200, Kurt Roeckx wrote:
> > I'm seeing various test suite failures in the 0.158 on various
> > arches.  I'm currently looing at powerpc since that's the only
> > Debian release architecture that's having the problem, but I see
> > it on various non-release arches too.
> 
> Thanks for the report. It would be nice if you could always output the
> test-suite.log file if the tests fail so they are available in the
> build.log. I did that in the fedora package:
>  make -s %{?_smp_mflags} check || (cat tests/test-suite.log; %{nocheck})

I'll add something like that, if I don't forget.

> One question, is this traditional big endian ppc or the new ELFv2 ABI
> ppc64-le architecture? elfutils currently doesn't have a backend for the
> new ELFv2 ABI. It will detect that the ELF files are little endian, but
> it won't know about the other ELFv2 changes (no function descriptors,
> different calling conventions, etc.)

It's the a 32 bit big endian powerpc, I assume it's the ABI that
has existed for over 10 years.

> > FAIL: run-backtrace-native.sh
> > =============================
> > 
> > 0x100000        0x103000        [vdso: 14111]
> > 0x20474000      0x20601000      /lib/powerpc-linux-gnu/libc-2.18.so
> > 0x20614000      0x2063d000      /lib/powerpc-linux-gnu/libpthread-2.18.so
> > 0x2064f000      0x20662000      /home/kroeckx/elfutils-0.158/tests/backtrace-child
> > 0x40000000      0x40033000      /lib/powerpc-linux-gnu/ld-2.18.so
> > TID 14111:
> > # 0 0x20626810          raise
> > TID 14112:
> > # 0 0x20626810          raise
> > /home/kroeckx/elfutils-0.158/tests/backtrace: dwfl_thread_getframes: No DWARF information found
> > /home/kroeckx/elfutils-0.158/tests/backtrace: dwfl_thread_getframes: No DWARF information found
> > backtrace: backtrace.c:68: callback_verify: Assertion `seen_main' failed.
> > ./test-subr.sh: line 84: 14110 Aborted                 (core dumped) LD_LIBRARY_PATH="${built_library_path}${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH" $VALGRIND_CMD "$@"
> > backtrace-child: no main
> 
> That is strange. It is as if libpthread-2.18.so doesn't have .eh_frame
> available. Could you check?

It does have an .eh_frame

> > FAIL: run-backtrace-dwarf.sh
> > ============================
> > 
> > 0xfdf8e08       raise
> > /home/kroeckx/elfutils-0.158/tests/backtrace-dwarf: dwfl_thread_getframes: No DWARF information found
> > dwarf: no main
> > rmdir: failed to remove 'test-14137': Directory not empty
> 
> This is probably similar.
> 
> Note that Mathias Klose did find a test issues right after 0.158 was
> released that improved the tests in some cases detecting support wasn't
> really available. See commit e922ec.

I know about it, he talked to me to find out what the problem was.
The patch has been applied.


Kurt