[Bug 95026] Alien Isolation segfault after initial loading screen/video

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95026

            Bug ID: 95026
           Summary: Alien Isolation segfault after initial loading
                    screen/video
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: haagch at frickel.club
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 123069
  --> https://bugs.freedesktop.org/attachment.cgi?id=123069&action=edit
layout asm, segfault is in the first line

I've had this for a while during playing around with the compute shader
patches, but I do not know whether they are at fault.

Running on
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Wimbledon XT [Radeon HD 7970M] (rev ff)
with mesa git and very recent llvm 3.9.

On the first start of Alien Isolation the game shows the initial loading screen
and then the 20th century logo video - while playing this video, Alien
Isolation segfaults. With subsequent starts of the game, it segfaults while
displaying the loading screen and before getting to the 20th century logo
video.

Unfortunately I can only provide this backtrace:

Thread 31 "WinMain" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffc816d700 (LWP 18766)]
0x00007fffe98a4387 in ?? () from /usr/lib/xorg/modules/dri/radeonsi_dri.so
(gdb) bt
#0  0x00007fffe98a4387 in ?? () from /usr/lib/xorg/modules/dri/radeonsi_dri.so
#1  0x0000000000000000 in ?? ()
(gdb)

because when I compile mesa with empty CFLAGS, it segfaults, but when mesa is
compiled with CFLAGS="-g", then the segfault does NOT happen and the game works
nicely. So there's only the assembly gdb shows with layout asm in the
attachment...

When I use the same mesa build that crashes on radeonsi with intel graphics, it
also does not crash, so it's something in the radeonsi driver.

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