Regression: r600 CS checker rejects narrow FBO renderbuffers.

Submitted by Nick Bowler

Assigned to Default DRI bug account

Description

Created attachment 34944
Full kernel log including failure message.

The R600 CS checker recently merged into the mainline kernel breaks rendering
to FBOs with renderbuffers of width <= 48. The height does not matter.
Attempting to run such a program terminates with

drmRadeonCmdBuffer: -22. Kernel failed to parse or rejected command stream.
See dmesg for more info.

and in dmesg:
radeon 0000:03:00.0: r600_cs_track_validate_cb:198 cb pitch (32 x 4 = 128) invalid
radeon 0000:03:00.0: r600_packet3_check:1109 invalid cmd stream 514
[drm:radeon_cs_ioctl] ERROR Invalid command stream !

Please see the test case attached to bug 27590 for a program which triggers
this issue. The program works on Linux 2.6.33 and with the software
rasterizer. The problem is reproducible with both mesa 7.8.1 and git master, against latest Linus git kernel.

Attachment 34944, "Full kernel log including failure message.":
kern.log