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From: Bernt Hansson <bah@bananmonarki.se>
Subject: Kernel or program error?
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Date: Sun, 23 Jul 2017 09:26:04 +0200
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Hello list!

FreeBSD 10.3-RELEASE-p11 #0 AMD64

Sometimes I get this error when running pycam and the preview window is 
all messed up:

radeon: The kernel rejected CS, see dmesg for more information.

dmesg:

error: [drm:pid4089:radeon_cs_parser_relocs] *ERROR* gem object lookup 
failed 0x4
error: [drm:pid4089:radeon_cs_ioctl] *ERROR* Failed to parse relocation -2!

Maybe there is a better list for this question?