The flood is caused by:
Commit: 4ac0533abaec2b83a7f2c675010eedd55664bc26

Author: Jerome Glisse <jglisse@redhat.com>  2012-12-13 12:08:11
Committer: Alex Deucher <alexander.deucher@amd.com>  2012-12-14 10:45:24
Parent: 9af20792124850369e764965690b99b20623dfc4 (drm/radeon: fix fence locking
in the pageflip callback)
Branch: remotes/origin/master
Follows: v3.7-rc7
Precedes: v3.8-rc1

    drm/radeon: fix htile buffer size computation for command stream checker

    Fix the size computation of the htile buffer.

    Signed-off-by: Jerome Glisse <jglisse@redhat.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

However, I think this is not related to the lockups/crashes. So, the bug's
description points actually to two different bugs: the flood and the crashes.
Should I open a different bug for the flood of GPU fault detected?