[Bug 48305] llpp gets segfault in r600g_dri.so

[Bug 48305] llpp gets segfault in r600g_dri.so

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=48305

--- Comment #2 from myxol <myxolmyxmyx@yopmail.com> 2012-04-04 13:40:19 UTC ---
Created attachment 59491
  --> https://bugs.freedesktop.org/attachment.cgi?id=59491
gdb output and xorg.log

gdb didn't produce any good backtrace. Could it be because llpp written in
ocaml?

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[Bug 48305] New: llpp gets segfault in r600g_dri.so

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https://bugs.freedesktop.org/show_bug.cgi?id=48305

             Bug #: 48305
           Summary: llpp gets segfault in r600g_dri.so
    Classification: Unclassified
           Product: Mesa
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/R600
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: myxolmyxmyx@yopmail.com


Loading any pdf with llpp produces segfault. 
Message in dmesg:
[115638.669260] llpp[15916] general protection ip:b64f6d84 sp:bfe416dc error:0
in r600g_dri.so[b62d3000+a72000]

mupdf that is used by llpp works flawlessly on r600g. And llpp works on fglrx.
I'm using Radeon 2600 PRO AGPx4.

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[Bug 48305] llpp gets segfault in r600g_dri.so

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=48305

Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Drivers/DRI/R600            |Drivers/Gallium/r600

--- Comment #1 from Alex Deucher <agd5f@yahoo.com> 2012-04-04 11:06:35 PDT ---
Can you get a proper backtrace with gdb?  Can you also include your xorg log
and dmesg output?

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[Bug 48305] llpp gets segfault in r600g_dri.so

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=48305

--- Comment #3 from myxol <myxolmyxmyx@yopmail.com> 2012-04-04 13:42:36 PDT ---
Created attachment 59492
  --> https://bugs.freedesktop.org/attachment.cgi?id=59492
dmesg output

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[Bug 48305] llpp gets segfault in r600g_dri.so

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https://bugs.freedesktop.org/show_bug.cgi?id=48305

--- Comment #4 from Alex Deucher <agd5f@yahoo.com> 2012-04-04 13:45:21 PDT ---
Make sure you install the debugging symbols for the 3D driver/mesa.  Most
distros package these separately.  Then when you hit the crash type "bt" in gdb
to get the backtrace.

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[Bug 48305] llpp gets segfault in r600g_dri.so

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=48305

--- Comment #6 from Michel Dänzer <michel@daenzer.net> 2012-04-05 06:48:04 UTC ---
(In reply to comment #5)
> After playing with compilation flags to get meaningful backtrace I found that
> this segfault happens only with -O3… Dunno if this is considered as a bug.

It's a bug *somewhere*, but it looks like it could be in the compiler... Maybe
you can try isolating which specific option implied by -O3 but not by -O2 makes
the difference.

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[Bug 48305] llpp gets segfault in r600g_dri.so

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=48305

--- Comment #5 from myxol <myxolmyxmyx@yopmail.com> 2012-04-05 05:54:49 PDT ---
Created attachment 59519
  --> https://bugs.freedesktop.org/attachment.cgi?id=59519
mesa backtrace

After playing with compilation flags to get meaningful backtrace I found that
this segfault happens only with -O3… Dunno if this is considered as a bug.
Anyway, bt full attached. Mesa compiled with "-march=native -O3 -ggdb -pipe".

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[Bug 48305] llpp gets segfault in r600g_dri.so

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=48305

--- Comment #7 from myxol <myxol@lavabit.com> 2012-04-05 17:49:05 PDT ---
> Maybe you can try isolating which specific option implied by -O3 but not by -O2 makes the difference.
I tried. It is -ftree-vectorize

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[Bug 48305] llpp gets segfault in r600g_dri.so

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https://bugs.freedesktop.org/show_bug.cgi?id=48305

--- Comment #8 from Michel Dänzer <michel@daenzer.net> 2012-04-06 04:11:52 PDT ---
Smells more like a compiler bug then. Which version of gcc is this? Does it
also happen with an older one?

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[Bug 48305] llpp gets segfault in r600g_dri.so

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=48305

--- Comment #9 from myxol <myxol@lavabit.com> 2012-04-07 07:28:42 PDT ---
I tried 3 gcc versions.
Flags: -march=native -O2 -ftree-vectorize -ggdb -pipe
4.4.7 - build fails
4.5.3 - original bugreport
4.6.2 - same problem as with 4.5.3

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[Bug 48305] llpp gets segfault in r600g_dri.so

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https://bugs.freedesktop.org/show_bug.cgi?id=48305

GitLab Migration User <gitlab-migration@fdo.invalid> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #10 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/407.

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