<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [gm45] Invalid GTT entry during Command Fetch from CS prefetch crossing page boundary" href="https://bugs.freedesktop.org/show_bug.cgi?id=91133#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [gm45] Invalid GTT entry during Command Fetch from CS prefetch crossing page boundary" href="https://bugs.freedesktop.org/show_bug.cgi?id=91133">bug 91133</a> from <a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> Chris Wilson</a> <pre>(In reply to Vincent Legoll from <a href="show_bug.cgi?id=91133#c3">comment #3</a>) > I'm not reproducing this any more with a new kernel: 4.1.0-11202-g4a10a91 > but I slightly tweaked the config, but not in GFX options though... How reproducible was it before? My hypothesis is that the CS prefetched a page as its PTE was being rewritten (since it crossed the boundary into an idle object) and that somehow corrupted the page address. I just haven't figured out how it can ever see an invalid GTT entry. Anyway, my hypothesis says that it would be very hard to trigger reliably (depends on timing and memory layout).</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>