From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 27141] piglit glean/vertProg1 core dumps with RV790
Date: Thu, 18 Mar 2010 07:47:02 -0700 (PDT)
Message-ID: <20100318144702.9BEC5130107@annarchy.freedesktop.org>
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http://bugs.freedesktop.org/show_bug.cgi?id=27141
--- Comment #2 from Chris Rankin 2010-03-18 07:47:02 PST ---
The problem happens when destroying the GLContext:
- we call _mesa_free_context_data(), which sets ctx->DrawBuffer = NULL
- _mesa_free_context_data() then calls _mesa_free_texture_data()
- _mesa_free_texture_data() calls r600DeleteTexture()
- r600DeleteTexture() calls radeonFlush() via radeon_firevertices()
- radeonFlush() tries to dereference ctx->DrawBuffer, which has just been set
to NULL
- BANG!
Adding a simple (ctx->DrawBuffer != NULL) check to radeonFlush() makes 43 of
the vertProg1 piglit tests pass, with 2 failures:
Program: RSQ test 2 (reciprocal square root of negative value)
Expected color: -1, 0.1, 0.447, 1
Observed color: 0, 0, 0, 0
Program: LIT test 2 (degenerate case: 0 ^ 0 -> 1)
Expected color: 1, 0.65, 1, 1
Observed color: 1, 0.65098, 0, 1
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