| Summary: | [SNB] Crash in brw_begin_transform_feedback | ||
|---|---|---|---|
| Product: | Mesa | Reporter: | nmcveity |
| Component: | Drivers/DRI/i965 | Assignee: | Ian Romanick <idr> |
| Status: | RESOLVED FIXED | QA Contact: | Intel 3D Bugs Mailing List <intel-3d-bugs> |
| Severity: | normal | ||
| Priority: | medium | CC: | itoral, nmcveity, siglesias |
| Version: | git | ||
| Hardware: | x86-64 (AMD64) | ||
| OS: | Linux (All) | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: |
Makefile for demo program
Demo program Details about crash from GDB |
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Created attachment 111312 [details]
Demo program
Created attachment 111313 [details]
Details about crash from GDB
This seems to be a gen6 specific crash, updated summary to reflect that. I'll look into it later this week when I am back in the office where I have gen6 hardware available. Sent a patch for review to the mailing list: http://lists.freedesktop.org/archives/mesa-dev/2015-January/073847.html Fixed in master with: 6367ca8b41 i965/gen6: Fix crash with VS+TF after rendering with GS |
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Created attachment 111311 [details] Makefile for demo program I have found a crash in the i965 gen6 code path on trunk. The crash occurs if you attempt to perform transform feedback after you have rendered using a geometry shader. The work around is to draw something without a geometry shader before attempting to do any transform feedback. The attached files contains a simplified demonstration program using glut. > make Will hopefully generate 'will_crash' and 'workaround' executables. I ran 'will_crash' in gdb with debug versions of mesa trunk @b3057f8 installed on my system. I have attached the backtrace and other info gleaned from gdb. They are in the attached CRASH.txt file.