etnaviv: *ERROR* relocation N outside object in kernel log

[Wladimir J. van der Laan]

While keeping ioquake3_opengl2 running on a GC2000 (i.mx6q), mesa master as of
322b34e, these messages are semi-randomly logged:

[  355.434762] [drm:etnaviv_ioctl_gem_submit] *ERROR* relocation 95 outside object
[  441.236364] [drm:etnaviv_ioctl_gem_submit] *ERROR* relocation 169 outside object
[  942.108318] [drm:etnaviv_ioctl_gem_submit] *ERROR* relocation 312 outside object
[ 1014.394550] [drm:etnaviv_ioctl_gem_submit] *ERROR* relocation 53 outside object
[ 1458.379389] [drm:etnaviv_ioctl_gem_submit] *ERROR* relocation 167 outside object
[ 1536.887630] [drm:etnaviv_ioctl_gem_submit] *ERROR* relocation 293 outside object

They don't seem to go along with visual corruption, though there seems to be a
single-frame hiccup. It is not clearly reproducible.

On GC3000, trying the same, the GPU occasionally hangs completely, with no
apparent error in the kernel log, just a hangcheck-reset-continue. Not sure
it's related at all, but the hangs don't occur on GC2000.

I don't see these problems with different applications. I'm not sure what could
cause a relocation outside an object to be emitted.

Regards,
Wladimir