Recently around 20 tex-miplevel-selection test regressed on my RV530.

Specifically this concerns the tex-miplevel-selection {1D,2D,2DRect}Shadow tests eg.
tex-miplevel-selection *GradARB 1DShadow -auto -fbo
tex-miplevel-selection *GradARB 2DRectShadow -auto -fbo
tex-miplevel-selection GL2:texture() 2DRectShadow -auto -fbo 
and others.

It used to work approximately one month ago and I tried to bisect mesa, however I was unable to find a good commit, so the regression must have happened in some other component. My best guess at this moment is some piglit change. Those tests are the only crashing piglits on my RV530 at the moment.

Backtrace from one selected test:
/bin/tex-miplevel-selection *GradARB 1DShadow -auto -fbo
r300: DRM version: 2.40.0, Name: ATI RV530, ID: 0x71c5, GB: 1, Z: 2
r300: GART size: 509 MB, VRAM size: 256 MB
r300: AA compression RAM: YES, Z compression RAM: YES, HiZ RAM: YES
u_blitter:494: Caught recursion. This is a driver bug.

Program received signal SIGSEGV, Segmentation fault.
r300_emit_gpu_flush (r300=0x8090ca0, size=9, state=0x807e7d0)
    at r300_emit.c:349
349	        height = surf->cbzb_height;
(gdb) bt full
#0  r300_emit_gpu_flush (r300=0x8090ca0, size=9, state=0x807e7d0)
    at r300_emit.c:349
        gpuflush = 0x807e7d0
        fb = 0x807e798
        height = 1
        width = 1
        cs_copy = 0xb4b3b008
        cs_winsys = 0x807e238
        cs_count = 0
        __func__ = "r300_emit_gpu_flush"
#1  0xb738cf2e in r300_emit_dirty_state (r300=0x8090ca0) at r300_emit.c:1450
        atom = 0x8090e38
#2  0xb739017e in r300_emit_states (instance_id=-1, index_bias=0, 
    buffer_offset=0, index_buffer=0x0, flags=<optimized out>, r300=0x8090ca0)
    at r300_render.c:259
        indexed = 0 '\000'
        validate_vbos = <optimized out>
        emit_states = <optimized out>
        emit_vertex_arrays = 0 '\000'
        emit_vertex_arrays_swtcl = 0 '\000'
#3  r300_prepare_for_rendering (r300=r300@entry=0x8090ca0, 
    flags=<optimized out>, flags@entry=PREP_EMIT_STATES, index_buffer=0x0, 
    cs_dwords=21, buffer_offset=0, index_bias=0, instance_id=-1)
    at r300_render.c:311
No locals.
#4  0xb7391775 in r300_blitter_draw_rectangle (blitter=0x8062750, x1=0, y1=0, 
    x2=1, y2=1, depth=0, type=UTIL_BLITTER_ATTRIB_COLOR, 
    attrib=0xb76437c0 <color>) at r300_render.c:1141
        last_sprite_coord_enable = 0
        width = 1
        height = 1
        vertex_size = <optimized out>
        dwords = 21
        zeros = {f = {0, 0, 0, 0}, i = {0, 0, 0, 0}, ui = {0, 0, 0, 0}}
        cs_copy = 0xb4b3b008
        cs_winsys = <optimized out>
        cs_count = 0
        __func__ = "r300_blitter_draw_rectangle"
#5  0xb72da0c4 in util_blitter_clear_custom (blitter=blitter@entry=0x8062750, 
    width=width@entry=1, height=1, num_layers=0, clear_buffers=0, 
    color=0xb76437c0 <color>, depth=0, stencil=0, custom_dsa=0x8064f20, 
    custom_blend=0x0) at util/u_blitter.c:1247
        ctx = 0x8062750
        pipe = 0x8090ca0
        sr = {ref_value = "\000"}
#6  0xb72db349 in util_blitter_custom_clear_depth (blitter=0x8062750, width=1, 
    height=1, depth=0, custom_dsa=0x8064f20) at util/u_blitter.c:1273
        color = {f = {0, 0, 0, 0}, i = {0, 0, 0, 0}, ui = {0, 0, 0, 0}}
#7  0xb73847c7 in r300_decompress_zmask (r300=0x8090ca0) at r300_blit.c:481
        fb = 0x807e798
#8  0xb7384eb1 in r300_decompress_zmask_locked_unsafe (r300=0x8090ca0)
    at r300_blit.c:500
        fb = {width = 1, height = 1, nr_cbufs = 0, cbufs = {0x0, 0x0, 0x0, 
            0x0, 0x0, 0x0, 0x0, 0x0}, zsbuf = 0x81ce978}
#9  0xb7384f00 in r300_decompress_zmask_locked (r300=0x8090ca0)
    at r300_blit.c:509
        saved_fb = {width = 900, height = 600, nr_cbufs = 1, cbufs = {
            0x81cbde0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, zsbuf = 0x0}
#10 0xb739b128 in r300_decompress_depth_textures (r300=0x8090ca0)
    at r300_state_derived.c:1033
        state = 0x8096518
        tex = <optimized out>
        count = 2
        i = <optimized out>
#11 r300_update_derived_state (r300=0x8090ca0) at r300_state_derived.c:1071
No locals.
#12 0xb7391751 in r300_blitter_draw_rectangle (blitter=0x8062750, x1=0, y1=0, 
    x2=960, y2=304, depth=0.600000024, type=UTIL_BLITTER_ATTRIB_COLOR, 
    attrib=0x815ee98) at r300_render.c:1136
        last_sprite_coord_enable = 0
        width = 960
        height = 304
        vertex_size = <optimized out>
        dwords = 21
        zeros = {f = {0, 0, 0, 0}, i = {0, 0, 0, 0}, ui = {0, 0, 0, 0}}
        cs_copy = 0xb4b3b008
        cs_winsys = <optimized out>
        cs_count = 0
        __func__ = "r300_blitter_draw_rectangle"
#13 0xb72da0c4 in util_blitter_clear_custom (blitter=0x8062750, 
    width=<optimized out>, height=304, num_layers=1, clear_buffers=4, 
    color=0x815ee98, depth=0.60000002384185791, stencil=0, custom_dsa=0x0, 
    custom_blend=0x0) at util/u_blitter.c:1247
        ctx = 0x8062750
        pipe = 0x8090ca0
        sr = {ref_value = "\000"}
#14 0xb72db307 in util_blitter_clear (blitter=<optimized out>, 
    width=<optimized out>, height=<optimized out>, num_layers=<optimized out>, 
    clear_buffers=<optimized out>, color=<optimized out>, 
    depth=<optimized out>, stencil=0) at util/u_blitter.c:1263
No locals.
#15 0xb7383458 in r300_clear (pipe=0x8090ca0, buffers=4, color=0x815ee98, 
    depth=0.60000002384185791, stencil=0) at r300_blit.c:368
        fb = <optimized out>
        hyperz = 0x80819c0
        width = 960
        height = 304
        hyperz_dcv = 2576980224
        __func__ = "r300_clear"
#16 0xb71952fb in st_Clear (ctx=0x815dd38, mask=256)
    at ../../src/mesa/state_tracker/st_cb_clear.c:532
        depthRb = <optimized out>
        stencilRb = <optimized out>
        quad_buffers = <optimized out>
        clear_buffers = <optimized out>
        i = <optimized out>
#17 0xb7042fb2 in _mesa_Clear (mask=16384) at ../../src/mesa/main/clear.c:222
        bufferMask = 256
        ctx = <optimized out>
        __func__ = "_mesa_Clear"
        __PRETTY_FUNCTION__ = "_mesa_Clear"
#18 0x0804c879 in piglit_display ()
    at /home/Paulie/piglit/tests/texturing/tex-miplevel-selection.c:1429
        fetch_level = -1208610337
        baselevel = -1073745544
        maxlevel = 0
        minlod = -1208152064
        maxlod = 3
        bias = 6
        mipfilter = 1
        expected_level = 134534584
        x = 134533911
        y = 33190
        total = 0
        failed = 1
        start_bias = -5
        end_bias = 5
        end_min_lod = 5
        end_max_lod = 5
        end_mipfilter = 1
        end_fetch_level = 5
#19 0xb7f611f8 in run_test (gl_fw=0x8051008, argc=3, argv=0xbffff2a4)
    at /home/Paulie/piglit/tests/util/piglit-framework-gl/piglit_fbo_framework.c:52
        result = PIGLIT_PASS
#20 0xb7f48e5a in piglit_gl_test_run (argc=3, argv=0xbffff2a4, 
    config=0xbffff1b8)
    at /home/Paulie/piglit/tests/util/piglit-framework-gl.c:151
        __PRETTY_FUNCTION__ = "piglit_gl_test_run"
#21 0x08049612 in main (argc=3, argv=0xbffff2a4)
    at /home/Paulie/piglit/tests/texturing/tex-miplevel-selection.c:67
        config = {supports_gl_es_version = 0, supports_gl_core_version = 0, 
          supports_gl_compat_version = 10, 
          require_forward_compatible_context = false, 
          require_debug_context = false, window_width = 900, 
          window_height = 600, window_samples = 0, window_visual = 5, 
          requires_displayed_window = false, init = 0x8049667 <piglit_init>, 
          display = 0x804c780 <piglit_display>, subtests = 0x0, 
          selected_subtests = 0x0, num_selected_subtests = 0}
        __PRETTY_FUNCTION__ = "main"


GPU:RV530
Kernel: 3.17.8-300.fc21.i686
Mesa: 5b01512df3328711968dea7240ae817721c79774
Libdrm: eca91cf163d50090db36d0b2abbffcff813a2adf
piglit: 25ac42dbd654daee3d5a0cf09a4212c5144eb74b