[Bug 81379] New: invalid reads from brw::vec4_visitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81379

          Priority: medium
            Bug ID: 81379
          Assignee: idr at freedesktop.org
           Summary: invalid reads from brw::vec4_visitor
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: All
          Reporter: lemody at gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/DRI/i965
           Product: Mesa

==20519== Invalid read of size 4
==20519==    at 0x5B7F704: brw::vec4_visitor::opt_cse_local(bblock_t*,
exec_list*) (brw_vec4_cse.cpp:229)
==20519==    by 0x5B7FA15: brw::vec4_visitor::opt_cse() (brw_vec4_cse.cpp:265)
==20519==    by 0x5B7E6E3: brw::vec4_visitor::run() (brw_vec4.cpp:1681)
==20519==    by 0x5B7E8A6: brw_vs_emit (brw_vec4.cpp:1757)
==20519==    by 0x5B97088: do_vs_prog (brw_vs.c:293)
==20519==    by 0x5B979AD: brw_vs_precompile (brw_vs.c:542)
==20519==    by 0x5B76E84: brw_link_shader (brw_shader.cpp:79)
==20519==    by 0x5A65045: _mesa_glsl_link_shader (ir_to_mesa.cpp:3082)
==20519==    by 0x596EE49: link_program (shaderapi.c:915)
==20519==    by 0x4047E5: init(gfxinfo_t*, void*) (in
/home/tpalli/test_animation)
==20519==    by 0x403A8A: TestApplication::exec(unsigned int) (in
/home/tpalli/test_animation)
==20519==    by 0x404B88: main (in /home/tpalli/test_animation)
==20519==  Address 0x69c2408 is 16 bytes after a block of size 40 alloc'd
==20519==    at 0x4A081D4: calloc (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==20519==    by 0x5B07781: ralloc_size (ralloc.c:113)
==20519==    by 0x5B27AB5: cfg_t::cfg_t(exec_list*) (brw_cfg.cpp:89)
==20519==    by 0x5B84A80: brw::vec4_visitor::calculate_live_intervals()
(brw_vec4_live_variables.cpp:251)
==20519==    by 0x5B7C51A: brw::vec4_visitor::dead_code_eliminate()
(brw_vec4.cpp:366)
==20519==    by 0x5B7E6AF: brw::vec4_visitor::run() (brw_vec4.cpp:1677)
==20519==    by 0x5B7E8A6: brw_vs_emit (brw_vec4.cpp:1757)
==20519==    by 0x5B97088: do_vs_prog (brw_vs.c:293)
==20519==    by 0x5B979AD: brw_vs_precompile (brw_vs.c:542)
==20519==    by 0x5B76E84: brw_link_shader (brw_shader.cpp:79)
==20519==    by 0x5A65045: _mesa_glsl_link_shader (ir_to_mesa.cpp:3082)
==20519==    by 0x596EE49: link_program (shaderapi.c:915)

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