[Nouveau] [Bug 98506] Pagefault in gf100_vm_flush

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Oct 30 18:06:08 UTC 2016


--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
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.

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