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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Pagefault in gf100_vm_flush"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98506#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Pagefault in gf100_vm_flush"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98506">bug 98506</a>
from <span class="vcard"><a class="email" href="mailto:imirkin@alum.mit.edu" title="Ilia Mirkin <imirkin@alum.mit.edu>"> <span class="fn">Ilia Mirkin</span></a>
</span></b>
<pre>OK, so it's very clearly this line:
nvkm_wr32(device, 0x100cb8, vpgd->obj->addr >> 8);
(note the shift by 8 that comes right after in the decoded code sequence), and
the issue is that vpgd->obj is bad:
RAX: 000000041ad09000
CR2: 000000041ad09090
where the faulting instruction is "mov 0x90(%rax),%rdi". It seems like obj
is a nvkm_gpuobj, which in turn is just a regular object that should come out
of kernel memory. However the RAX value doesn't seem like a usual kernel memory
address, which means it's uninitialized.</pre>
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