[Bug 107655] X segfaults on startup in r300_dri.so, making system unusable

[Bug 107655] X segfaults on startup in r300_dri.so, making system unusable

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107655

            Bug ID: 107655
           Summary: X segfaults on startup in r300_dri.so, making system
                    unusable
           Product: Mesa
           Version: 18.1
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: Drivers/Gallium/r300
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: virtuousfox@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 141236
  --> https://bugs.freedesktop.org/attachment.cgi?id=141236&action=edit
Xorg.pid-1154.gdb.log

I have updated my old Asus F3Ke notebook with "ATI Mobility Radeon X2300
(ChipID = 0x718a)" after neglecting it for 1-2 years and now I can't launch
desktop session because X immediately segfaults. This is what I was able to get
after installing debug data and launching Xgdb script.

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[Bug 107655] X segfaults on startup in r300_dri.so, making system unusable

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https://bugs.freedesktop.org/show_bug.cgi?id=107655

--- Comment #1 from Sergey Kondakov <virtuousfox@gmail.com> ---
Created attachment 141237
  --> https://bugs.freedesktop.org/attachment.cgi?id=141237&action=edit
Xorg.0.log

Normal X log.

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[Bug 107655] X segfaults on startup in r300_dri.so, making system unusable

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107655

--- Comment #2 from Sergey Kondakov <virtuousfox@gmail.com> ---
Created attachment 141238
  --> https://bugs.freedesktop.org/attachment.cgi?id=141238&action=edit
Asus_F3Ke.dmesg

dmesg from affected machine.

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[Bug 107655] X segfaults on startup in r300_dri.so, making system unusable

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107655

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #141237|text/x-log                  |text/plain
          mime type|                            |

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[Bug 107655] X segfaults on startup in r300_dri.so, making system unusable

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107655

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #141236|text/x-log                  |text/plain
          mime type|                            |

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[Bug 107655] X segfaults on startup in r300_dri.so, making system unusable

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107655

Michel Dänzer <michel@daenzer.net> changed:

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

--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
GCC's libstdc++ code crashes trying to use an instruction not supported by your
CPU. You need to report this to your distro.

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[Bug 107655] X segfaults on startup in r300_dri.so, making system unusable

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107655

Sergey Kondakov <virtuousfox@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                URL|                            |https://bugzilla.opensuse.o
                   |                            |rg/show_bug.cgi?id=1105608

--- Comment #4 from Sergey Kondakov <virtuousfox@gmail.com> ---
(In reply to Michel Dänzer from comment #3)
> GCC's libstdc++ code crashes trying to use an instruction not supported by
> your CPU. You need to report this to your distro.

So, I've bothered my distro's bugzilla, and gcc's, then figured out why it was
crashing: Mesa doesn't like being built with clang/gold and ThinLTO (Mesa
doesn't build via gcc with LTO and openSUSE's OBS can't handle gcc's LTO
implementation even if it would). I don't know the actual reason of the crash
but the guys there figured out that the crash was coming from AVX instruction
in Mesa's SWR code. The affected machine does not support any kind of AVX, so
it threw out the error. But it's unclear why SWR even been trying to initialize
during the load of r300_dri. If built without any {C,LD}FLAGS and with gcc,
nothing crashes even with SWR built and installed. And there is no trace of SWR
doing things at boot on AVX-capable amdgpu/radeonsi machine even with clang's
build.

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[Bug 107655] X segfaults on startup in r300_dri.so, making system unusable

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107655

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
                   |.org                        |org
             Status|RESOLVED                    |REOPENED
         QA Contact|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
                   |.org                        |org
          Component|Drivers/Gallium/r300        |Drivers/Gallium/swr
         Resolution|NOTOURBUG                   |---

--- Comment #5 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Sergey Kondakov from comment #4)
> I don't know the actual reason of the crash but the guys there figured out that
> the crash was coming from AVX instruction in Mesa's SWR code. The affected
> machine does not support any kind of AVX, so it threw out the error. But it's
> unclear why SWR even been trying to initialize during the load of r300_dri.

I think it's the combination of two things:

* All Gallium drivers are linked into a single binary (so-called mega-driver)

* SWR is compiled with AVX support and has initializers which are automatically
executed when the above binary is dlopen()ed.

Until there's a solution for this, SWR cannot be enabled in a build which has
to run on non-AVX capable CPUs.

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