Created attachment 58244 [details] Xorg.0.log Trying to boot the system. When X system becomes loaded screen is flickering and XServer crashes.
Can you install debugging symbols and get a proper backtrace with gdb (http://wiki.x.org/wiki/Development/Documentation/ServerDebugging)? Also please attach your dmesg output.
Created attachment 58249 [details] valgrind output gdb doesn't provide a backtrace. Maybe valgrind output helps.
(In reply to comment #2) > gdb doesn't provide a backtrace. Why not? How exactly did you try to get it? > Maybe valgrind output helps. I'm afraid not; I don't see anything obviously wrong in there. I haven't been able to reproduce such a crash on any of my machines, so we really will need to see a better backtrace.
I recompiled xf86-video-ati via gcc and it works again. So there is sth. wrong in clang compiled code. To gather the backtrace I patched the XServer: https://build.opensuse.org/package/view_file?file=Use-external-tool-for-creating-backtraces-on-crashes.patch&package=xorg-x11-server&project=openSUSE%3A12.1 So it uses xorg-backtrace [and gdb]: https://build.opensuse.org/package/view_file?file=xorg-backtrace&package=xorg-x11-server&project=openSUSE%3A12.1 The output is then also written to /var/log/Xorg.0.log ... But it does not provide a backtrace, too. :(
Created attachment 90030 [details] [review] Fix radeon kms with clang I had the same problem, machine would segfault with Xorg if compiled with clang on a Radeon HD6770. Compiling it with O0 would fix it, as well as using gcc. I went over the two clang warnings and fixed it, now it works fine with clang.
I think this is fixed with http://cgit.freedesktop.org/xorg/xserver/commit/?id=63f83d1b7f496d05b409352749cdb6674d71cf80 Please test!
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