Comment # 9
on bug 96271
from Julien Isorce
Hi Stephen, if you still have the same machine/setup maybe worth to try the apitrace 1) that I mentioned here https://bugs.freedesktop.org/show_bug.cgi?id=100712#c7 . I wonder if it is the same issue. About "dmesg_after_hard_hang.txt" / "kernel_log_during_gdm_restart.txt" all these exact same backtraces are happening because the ring 0(GFX) is still stuck after gpu reset. So acceleration is marked as disabled. But then mesa clear some buffers being cached before reset and it hits WARN_ON in radeon_ttm_bo_destroy, see https://cgit.freedesktop.org/~agd5f/linux/tree/drivers/gpu/drm/radeon/radeon_object.c?h=amd-staging-4.9#n72. I recently submitted a patch to change it to a WARN_ON_ONCE. But the real problem is the ring 0 stalled in the first place. For me I found that setting R600_DEBUG=nowc workarounds the problem. Also I have not found any full dmesg log in the attachments, especially infos generated at startup.
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