[Bug 97894] Crash in u_transfer_unmap_vtbl when unmapping a buffer mapped in different context - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 97894] Crash in u_transfer_unmap_vtbl when unmapping a buffer mapped in different context
Date: Thu, 22 Sep 2016 09:26:57 +0000	[thread overview]
Message-ID: <bug-97894-502@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=97894

            Bug ID: 97894
           Summary: Crash in u_transfer_unmap_vtbl when unmapping a buffer
                    mapped in different context
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: jlegg@feralinteractive.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 126724
  --> https://bugs.freedesktop.org/attachment.cgi?id=126724&action=edit
Apitrace reproducing issue

The following sequence of events cause a crash on radeonsi:
1. Create two contexts in the same share group
2. In one of the contexts, create and map a buffer. Then delete that context.
3. Create another context in the share group
4. Cause the buffer to be unmapped in the new context (either explicitly with
glUnmapBuffer/glUnmapNamedBuffer or implicitly via glDeleteBuffers).

The attached apitrace reproduces the issue when using an AMD R9 270, unless
environment variable LIBGL_ALWAYS_SOFTWARE is set to 1.

I reproduced this using Mesa git 36f0f0318275f65f8744ec6f9471702e2f58e6d5 and
the 12.0.3 release on x86_64 Fedora 24.
My OpenGL renderer string is Gallium 0.4 on AMD PITCAIRN (DRM 2.45.0 /
4.7.2-201.fc24.x86_64, LLVM 3.9.0).

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