[Bug 86974] New: fs_generator::generate_code(const cfg_t*, int): Assertion `inst->force_writemask_all' failed in Witcher2 with INTEL_DEBUG=shader_time

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86974

            Bug ID: 86974
           Summary: fs_generator::generate_code(const cfg_t*, int):
                    Assertion `inst->force_writemask_all' failed in
                    Witcher2 with INTEL_DEBUG=shader_time
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 110411
  --> https://bugs.freedesktop.org/attachment.cgi?id=110411&action=edit
Gdb output on the assert

Setup:
- HSW GT3e
- Ubuntu 14.10
- Latest Mesa (ef7e0b39a24966526b102643523feac765771842),
  built with --enable-debug

Steps:
- export following environment variable:
  INTEL_DEBUG=shader_time
- run Witcher2 with above env variable and latest Mesa

Result:
- Game crashes to an assert

More info:
- Crash happens only with "shader_time".
- If Mesa isn't compiled with --enable-debug, one needs to select "Arena" from
the game main menu and only then it will crash

---------------
Mesa: User error: GL_INVALID_OPERATION in
glRenderbufferStorageMultisample(samples)
Mesa: User error: GL_INVALID_OPERATION in
glRenderbufferStorageMultisample(samples)
Mesa: User error: GL_INVALID_OPERATION in
glRenderbufferStorageMultisample(samples)
Mesa: User error: GL_INVALID_OPERATION in
glRenderbufferStorageMultisample(samples)
Mesa: User error: GL_INVALID_OPERATION in
glRenderbufferStorageMultisample(samples)
Mesa: User error: GL_INVALID_OPERATION in
glRenderbufferStorageMultisample(samples)
Mesa: User error: GL_INVALID_OPERATION in
glRenderbufferStorageMultisample(samples)
Mesa: User error: GL_INVALID_OPERATION in
glRenderbufferStorageMultisample(samples)
glCreateShader is no-op
glShaderSource is no-op
glCompileShader is no-op
glCreateShader is no-op
...
glCreateShader is no-op
glShaderSource is no-op
glCompileShader is no-op
witcher2:
../../../../../../src/mesa/drivers/dri/i965/brw_fs_generator.cpp:1567: int
fs_generator::generate_code(const cfg_t*, int): Assertion
`inst->force_writemask_all' failed.
---------------

Gdb output is attached.

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