On Mon, May 22, 2023 at 05:41:17PM +0100, Will Deacon wrote:
On Tue, May 16, 2023 at 02:44:49PM +0100, Will Deacon wrote:
On Tue, May 16, 2023 at 11:58:40AM +0530, Naresh Kamboju wrote:
Following kernel BUG noticed while running selftests arm64 fp-stress running stable rc kernel versions 6.1.29-rc1 and 6.3.3-rc1.
Is there a known-good build so that we could attempt a bisection?
FWIW, I've been trying (and failing) all day to reproduce this in QEMU. I matched the same VL configuration as you have in the fastmodel and tried enabling additional memory debugging options too, but I'm yet to see a kfence splat (or any other splat fwiw).
How often do you see this?
As I said in another mail I've also been unable to reproduce this. FWIW I *suspect* that it might need to be run in the context of a full kselftest run to manifest rather than just running fp-stress in isolation, that's mostly a guess but given that the kfence trap appeared to be happening on free at a point where the test program shouldn't be exiting any tasks and should not be changing vector lengths on tasks that have used either of the vector extensions.