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).