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.
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