[Bug 72716] SIGBUS in EVERGREENUploadToScreen after hibernation (Linux 3.12.4-tuxonice)

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Dec 22 13:25:58 PST 2013


--- Comment #7 from txtoxtox285 at googlemail.com ---
Correct me if I’m wrong, but if I understand the driver code correctly, the
SIGBUS is delivered because of the following chain of function calls:

ttm_bo_move_buffer(bo, {fpfn = 0x0, lpfn = 0x10000, num_placement = 1,
num_busy_placement = 1}, 0, 0) = -12
radeon_bo_fault_reserve_notify (as bdev->driver->fault_reserve_notify
ttm_bo_vm_fault (as ttm_vm_ops->fault)

where the return value from ttm_bo_move_buffer (-ENOMEM) is moved up to
ttm_bo_vm_fault, which then returns VM_FAULT_SIGBUS.

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