Dear Mark, Mark Wielaard wrote on 03.08.2015 21:47: > On Mon, Aug 03, 2015 at 08:31:12PM +0200, Kai Wasserbäch wrote: >> Steps to reproduce: > > This is going to be a bit hard for me to reproduce since I don't > actually use Debian for development (sorry). I do work on upstream > elfutils though. > >> - you need a AMD GPU powered by the radeonsi driver > > I don't have one of those.
If you want to see anything beyond what's in the backtrace and register dump (<https://bugs.freedesktop.org/attachment.cgi?id=117480>), let me know, I can run these tests as often as needed. I might just have to switch between good and bad versions. >> - build Mesa with the radeonsi driver (it uses LLVM as a backend to generate >> machine instructions, the compiled result is returned as an ELF, hence the >> dependency on libelf) linked against a current libelf1 (or take my build, >> if you wish) > > A build would be helpful I think. Ok, her you go: <http://dev.carbon-project.org/debian/bts/794488/bts794488_mesa.tar.xz> (password for access sent to you in private; this is just there to limit traffic, feel free to share these files wherever you want) A few notes on that file: - the bad folder contains a Mesa build, which crashes/is linked against libelf1 - the good folder contains a Mesa build, which runs the test fine/is linked against libelfg0 - each folder contains a full set of all binary packages for amd64/x86_64 and the source package, which was used to generate them. - I didn't include the i386 build - radeonsi_dri.so is in libgl1-mesa-dri - both packages were linked against libLLVM-3.8.so.1 from <http://llvm.org/apt/unstable/pool/main/l/llvm-toolchain-snapshot/libllvm3.8_3.8~svn243678-1~exp1_amd64.deb> (this link might go dead, when a new version is built, but I have a local copy I can send you). > Could you point me to the source code that does the libelf calls to create > the ELF file? Maybe reading the source helps to figure out what might go > wrong. The stacktrace from the test doesn't immediately seem to give a > direct clue. I think all the ELF stuff is encapsulated in <http://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/drivers/radeon/radeon_elf_util.c> (and the header for that). The functions defined therein are called from <http://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/drivers/radeonsi/si_shader.c> and <http://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/drivers/radeonsi/si_compute.c> if I haven't missed something. Michel can probably spot any mistakes in this, therefore I CCed him on this message. Let me know, if you need something else. Cheers, Kai
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