[Bug 94512] X segfaults on launching in x32 environment

[Bug 94512] X segfaults on launching in x32 environment

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https://bugs.freedesktop.org/show_bug.cgi?id=94512

            Bug ID: 94512
           Summary: X segfaults on launching in x32 environment
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: EoD@xmw.de
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 122253
  --> https://bugs.freedesktop.org/attachment.cgi?id=122253&action=edit
backtrace of the segfault

When I try launching X (via startx e.g.), X segfaults with the following
backtrace.

The segfault does not happen when I use a software rasterizer.

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[Bug 94512] X segfaults on launching in x32 environment

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https://bugs.freedesktop.org/show_bug.cgi?id=94512

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Looks like maybe libglapi.so.0 should be picked up from somewhere other than
/usr/libx32/libglapi.so.0? It should be from the same build as the rest of the
Mesa binaries. If that's not the problem, please get a backtrace with debugging
symbols available for /usr/libx32/libglapi.so.0 as well.

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[Bug 94512] X segfaults on launching in x32 environment

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https://bugs.freedesktop.org/show_bug.cgi?id=94512

--- Comment #2 from EoD <EoD@xmw.de> ---
(In reply to Michel Dänzer from comment #1)
> Looks like maybe libglapi.so.0 should be picked up from somewhere other than
> /usr/libx32/libglapi.so.0? It should be from the same build as the rest of
> the Mesa binaries. If that's not the problem, please get a backtrace with
> debugging symbols available for /usr/libx32/libglapi.so.0 as well.

I am not sure where it should be picked up from. How would I figure that out?

The library is from the same build as the rest of the Mesa binaries and the
library has debugging symbols available.

/usr/libx32/libglapi.so:           symbolic link to libglapi.so.0.0.0
/usr/libx32/libglapi.so.0:         symbolic link to libglapi.so.0.0.0
/usr/libx32/libglapi.so.0.0.0:     ELF 32-bit LSB shared object, x86-64,
version 1 (SYSV), dynamically linked, not stripped

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[Bug 94512] X segfaults with glx-tls enabled in a x32 environment

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https://bugs.freedesktop.org/show_bug.cgi?id=94512

EoD <EoD@xmw.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|X segfaults on launching in |X segfaults with glx-tls
                   |x32 environment             |enabled in a x32
                   |                            |environment

--- Comment #3 from EoD <EoD@xmw.de> ---
This segfault is not restricted to starting X, but also happen with glxgears
and glxinfo in a multilib environment.


I also figured out those segfaults only happen if glx-tls is enabled. If
glx-tls is disabled X, glxinfo and glxgears work fine again.

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[Bug 94512] X segfaults with glx-tls enabled in a x32 environment

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https://bugs.freedesktop.org/show_bug.cgi?id=94512

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         QA Contact|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
                   |.org                        |org
           Assignee|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
                   |.org                        |org
          Component|Drivers/Gallium/radeonsi    |GLX

--- Comment #4 from Michel Dänzer <michel@daenzer.net> ---
Sounds like it's not a driver specific issue then but a general one with
GLX-TLS on x32.

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