On Fri, Jul 11, 2014 at 12:31:12PM +0100, Tvrtko Ursulin wrote: > > On 07/11/2014 12:06 PM, Chris Wilson wrote: > >On Fri, Jul 11, 2014 at 12:00:26PM +0100, Tvrtko Ursulin wrote: > >>But it will be interesting to know what code managed to trigger this > >>race, because as we discussed on IRC it would indicate some pretty > >>wild userspace behaviour. Or lack of imagination on our part? > > > >A threaded client. One thread using userptr, the other doing munmap or > >free. Given enough embarrassment, it will happen every time. > > Yes fine, but I struggle to imagine what would be the intention of > such code or how did it manage to fail in such way. I hope the only > difference is not that userptr "upgraded" the failure mode for heap > corruption or memory management races in general. The mmu notifier is called everytime a process sneezes. It does not imply that our object is being invalidated, just that some portion of the current->mm is being modified. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
