https://bugs.freedesktop.org/show_bug.cgi?id=97128

Bug ID: 97128 Summary: Kernel hang when running out of memory Product: DRI Version: XOrg git Hardware: Other OS: All Status: NEW Severity: normal Priority: medium Component: DRM/AMDgpu Assignee: dri-devel@lists.freedesktop.org Reporter: bas@basnieuwenhuizen.nl

If I allocate too much memory I get a kernel hang using the drm-next-4.8 branch from Alex Deucher. SSH stops working too.

This has been tests by allocating GTT buffers in a loop using the winsys for the new radv vulkan driver. Just as radeonsi, the winsys has a 3 step allocation process: 1) allocate the buffer 2) Allocate an address range 3) Map the buffer to address range.

This hang is a regression. Bisection pointed to the following patch as culprit:

commit 089f16c55baacd5e8ae3745625efa82899b4b217 Author: Christian König christian.koenig@amd.com Date: Mon Jun 6 10:17:50 2016 +0200

drm/ttm: cleanup ttm_tt_(unbind|destroy)

ttm_tt_destroy should be the only one unbinding the object.

Reviewed-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Christian König christian.koenig@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com