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 at lists.freedesktop.org
Reporter: jlegg at feralinteractive.com
QA Contact: dri-devel at 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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