Comment # 10 on bug 931309 from Egbert Eich

Some notes for myself (please ignore):

[  4951.534] (EE) 3: /usr/lib64/xorg/modules/drivers/intel_drv.so
(0x7fc5c6a98000+0xd8d48) [0x7fc5c6b70d48]
[  4951.534] (EE) 4: /usr/lib64/xorg/modules/drivers/intel_drv.so
(0x7fc5c6a98000+0x24c80) [0x7fc5c6abcc80]

Backtrace:
/usr/src/debug/xf86-video-intel-2.99.916/src/sna/gen7_render.c:3483
/(discriminator 1)
   d8d48:       0f b7 51 04             movzwl 0x4(%rcx),%edx

/usr/src/debug/xf86-video-intel-2.99.916/src/sna/sna_accel.c:7163
   24c57:       48 8b 54 24 28          mov    0x28(%rsp),%rdx
   24c5c:       48 8b 74 24 38          mov    0x38(%rsp),%rsi
   24c61:       48 8b 7d 00             mov    0x0(%rbp),%rdi
   24c65:       48 8d 44 88 04          lea    0x4(%rax,%rcx,4),%rax
   24c6a:       4c 89 e9                mov    %r13,%rcx
   24c6d:       48 29 d1                sub    %rdx,%rcx
   24c70:       48 89 44 24 20          mov    %rax,0x20(%rsp)
   24c75:       48 c1 f9 03             sar    $0x3,%rcx
   24c79:       ff 94 24 f0 01 00 00    callq  *0x1f0(%rsp)
/usr/src/debug/xf86-video-intel-2.99.916/src/sna/sna_accel.c:7140
   24c80:       8b 44 24 1c             mov    0x1c(%rsp),%eax
   24c84:       85 c0                   test   %eax,%eax
   24c86:       0f 85 fc fe ff ff       jne    24b88
   <drm_intel_bufmgr_gem_init@plt+0x136e8>