[Bug 86089] [r600g] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

[Bug 86089] [r600g] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=86089

            Bug ID: 86089
           Summary: [r600g] shader failure -
                    r600_sb::bc_finalizer::cf_peephole() when starting
                    Second Life
           Product: Mesa
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: shawn.starr@rogers.com

Compiling November 10th build of git master for rv6xx:

kernel: 3.18.0-0.rc3.git2.2.fc22.1.x86_64
mesa-dri-drivers-10.4-0.devel.100.20141110.fc21.x86_64 (custom using Fedora's
.spec file)

I am using R600_DEBUG=hyperz

I get the following crash:

Program received signal SIGSEGV, Segmentation fault.
0x00007fffe916bb4e in r600_sb::bc_finalizer::cf_peephole
(this=this@entry=0x7fffffffb350) at sb/sb_bc_finalize.cpp:877
877                             c->jump_target =
static_cast<cf_node*>(c->jump_target->next);


Full stack dump attached

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[Bug 86089] [r600g] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

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https://bugs.freedesktop.org/show_bug.cgi?id=86089

--- Comment #1 from Shawn Starr <shawn.starr@rogers.com> ---
Created attachment 109185
  --> https://bugs.freedesktop.org/attachment.cgi?id=109185&action=edit
Crash from gdb stacktrace

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[Bug 86089] [r600g] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=86089

--- Comment #2 from Shawn Starr <shawn.starr@rogers.com> ---
Bisecting came up with this as bad commit:

73dd50acf6d244979c2a657906aa56d3ac60d550 is the first bad commit
commit 73dd50acf6d244979c2a657906aa56d3ac60d550
Author: Tapani Pälli <tapani.palli@intel.com>
Date:   Wed Aug 6 09:46:54 2014 +0300

    glsl: implement switch flow control using a loop

    Patch removes old variable based logic for handling a break inside
    switch. Switch is put inside a loop so that existing infrastructure
    for loop flow control can be used for the switch, now also dead code
    elimination works properly.

    Possible 'continue' call inside a switch needs now special handling
    which is taken care of by detecting continue, breaking out and calling
    continue for the outside loop.

    v2: remove one unnecessary ir_expression (Curro)

    Fixes following Piglit tests:

       fs-exec-after-break.shader_test
       fs-conditional-break.shader_test

    No Piglit or es3conform regressions.

    Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
    Reviewed-by: Francisco Jerez <currojerez@riseup.net>

:040000 040000 eac8a47066723ff804317ef11bb006dd0bb80d0f
b73ed6cc78a66c54d684635f69a358fd54f65929 M      src

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[Bug 86089] [r600g] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

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https://bugs.freedesktop.org/show_bug.cgi?id=86089

--- Comment #3 from Shawn Starr <shawn.starr@rogers.com> ---
A second bisect, repeated this. So this is the commit that breaks r600 SB
compiler.

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[Bug 86089] [r600g][mesa 10.4.0-dev] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=86089

Shawn Starr <shawn.starr@rogers.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[r600g] shader failure -    |[r600g][mesa 10.4.0-dev]
                   |r600_sb::bc_finalizer::cf_p |shader failure -
                   |eephole() when starting     |r600_sb::bc_finalizer::cf_p
                   |Second Life                 |eephole() when starting
                   |                            |Second Life

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[Bug 86089] [r600g][mesa 10.4.0-dev] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

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https://bugs.freedesktop.org/show_bug.cgi?id=86089

Emil Velikov <emil.l.velikov@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sonichedgehog_hyperblast00@
                   |                            |yahoo.com

--- Comment #4 from Emil Velikov <emil.l.velikov@gmail.com> ---
*** Bug 86418 has been marked as a duplicate of this bug. ***

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[Bug 86089] [r600g][mesa 10.4.0-dev] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

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https://bugs.freedesktop.org/show_bug.cgi?id=86089

--- Comment #5 from Emil Velikov <emil.l.velikov@gmail.com> ---
>From bug 86418:
I tried launching the Second Life viewer (Kokua 3.7.8 x64) using the latest GIT
version of MESA, and noticed the viewer crashes as soon as it's time to render
the world. The crash only happens when Basic Shaders are enabled.

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[Bug 86089] [r600g][mesa 10.4.0-dev] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

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https://bugs.freedesktop.org/show_bug.cgi?id=86089

--- Comment #6 from MirceaKitsune <sonichedgehog_hyperblast00@yahoo.com> ---
As mentioned in the related bug report, I can confirm this. I did a GIT bisect
and the same commit causes this crash for me too. I'm ready to test the fix
once one is in place.

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[Bug 86089] [r600g][mesa 10.4.0-dev] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

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https://bugs.freedesktop.org/show_bug.cgi?id=86089

--- Comment #7 from Dave Airlie <airlied@freedesktop.org> ---
Created attachment 110153
  --> https://bugs.freedesktop.org/attachment.cgi?id=110153&action=edit
fix loops with no repeat.

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[Bug 86089] [r600g][mesa 10.4.0-dev] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

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https://bugs.freedesktop.org/show_bug.cgi?id=86089

--- Comment #8 from Shawn Starr <shawn.starr@rogers.com> ---
Patch causes lockup, discounting the other issues now fixed. This looks to be
missing something else.

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[Bug 86089] [r600g][mesa 10.4.0-dev] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

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https://bugs.freedesktop.org/show_bug.cgi?id=86089

Dave Airlie <airlied@freedesktop.org> changed:

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

--- Comment #9 from Dave Airlie <airlied@freedesktop.org> ---
should be fixed in master a while back.

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[Bug 86089] [r600g][mesa 10.4.0-dev] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

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https://bugs.freedesktop.org/show_bug.cgi?id=86089

--- Comment #10 from MirceaKitsune <sonichedgehog_hyperblast00@yahoo.com> ---
Confirming that it's fixed, the SL viewer works again with latest MESA GIT
master.

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[Bug 86089] [r600g][mesa 10.4.0-dev] shader failure - r600_sb::bc_finalizer::cf_peephole() when starting Second Life

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https://bugs.freedesktop.org/show_bug.cgi?id=86089

Shawn Starr <shawn.starr@rogers.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #11 from Shawn Starr <shawn.starr@rogers.com> ---
+1 here

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