Hi, Christian, On 4/8/20 1:53 PM, Thomas Hellström (VMware) wrote:
From: "Thomas Hellstrom (VMware)" <thomas_os@xxxxxxxxxxxx> With amdgpu and CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y, there are errors like: BUG: non-zero pgtables_bytes on freeing mm and: BUG: Bad rss-counter state with TTM transparent huge-pages. Until we've figured out what other TTM drivers do differently compared to vmwgfx, disable the huge_fault() callback, eliminating transhuge page-table entries. Cc: Christian König <christian.koenig@xxxxxxx> Signed-off-by: Thomas Hellstrom (VMware) <thomas_os@xxxxxxxxxxxx> Reported-by: Alex Xu (Hello71) <alex_y_xu@xxxxxxxx> Tested-by: Alex Xu (Hello71) <alex_y_xu@xxxxxxxx> ---
Without being able to test and track this down on amdgpu there's little more than this I can do at the moment. Hopefully I'll be able to test on nouveau/ttm after getting back from vacation to see if I can reproduce.
It looks like some part of the kernel mistakes a huge page-table entry for a page directory, and that would be a path that is not hit with vmwgfx.
/Thomas _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
