mesa: 02b6da1e87ddf333a71b37234c356b3f3f7f58be (master)

$ ./bin/masked-clear -auto
Mesa warning: failed to remap glClampColorARB
Mesa warning: failed to remap glTexBufferARB
Mesa warning: failed to remap glFramebufferTextureARB
Mesa warning: failed to remap glVertexAttribDivisorARB
Mesa warning: failed to remap glProgramParameteriARB
masked-clear: stencil buffer value is 3, expected 2
        GL_STENCIL_WRITEMASK = 0x2
masked-clear: stencil buffer value is 7, expected 4
        GL_STENCIL_WRITEMASK = 0x4
masked-clear: stencil buffer value is 15, expected 8
        GL_STENCIL_WRITEMASK = 0x8
masked-clear: stencil buffer value is 31, expected 16
        GL_STENCIL_WRITEMASK = 0x10
masked-clear: stencil buffer value is 63, expected 32
        GL_STENCIL_WRITEMASK = 0x20
masked-clear: stencil buffer value is 127, expected 64
        GL_STENCIL_WRITEMASK = 0x40
masked-clear: stencil buffer value is 255, expected 128
        GL_STENCIL_WRITEMASK = 0x80
PIGLIT: {'result': 'fail' }


cabe4fbb852f3c335937e3576db85d0143cb6c12 is the first bad commit
commit cabe4fbb852f3c335937e3576db85d0143cb6c12
Author: Marek Olšák <maraeo@gmail.com>
Date:   Mon Jan 14 06:57:28 2013 +0100

    st/mesa: always assume separate depth and stencil clear is supported

    All drivers implement it now.

    Reviewed-by: Brian Paul <brianp@vmware.com>

:040000 040000 dcfc8a78bba351a39a856c95d9ad3cf64021f552 6cd989d9615cbe17dda7c0b46891dcb309579df2 M      src
bisect run success