On Sat, 28 Oct 2023 at 13:12, Ard Biesheuvel <ardb@xxxxxxxxxx> wrote: > > On Fri, 27 Oct 2023 at 12:57, Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> wrote: > > > > On Thu, 26 Oct 2023 at 21:09, Ard Biesheuvel <ardb@xxxxxxxxxx> wrote: > > > > > > On Thu, 26 Oct 2023 at 17:30, Mark Rutland <mark.rutland@xxxxxxx> wrote: > > > > > > > > On Thu, Oct 26, 2023 at 08:11:26PM +0530, Naresh Kamboju wrote: > > > > > Following kernel crash noticed on qemu-arm64 while running LTP syscalls > > > > > set_robust_list test case running Linux next 6.6.0-rc7-next-20231026 ... > > > > It looks like this is fallout from the LPA2 enablement. > > > > > > > > According to the latest ARM ARM (ARM DDI 0487J.a), page D19-6475, that "unknown > > > > 43" (0x2b / 0b101011) is the DFSC for a level -1 translation fault: > > > > > > > > 0b101011 When FEAT_LPA2 is implemented: > > > > Translation fault, level -1. > > > > > > > > It's triggered here by an LDTR in a get_user() on a bogus userspace address. > > > > The exception is expected, and it's supposed to be handled via the exception > > > > fixups, but the LPA2 patches didn't update the fault_info table entries for all > > > > the level -1 faults, and so those all get handled by do_bad() and don't call > > > > fixup_exception(), causing them to be fatal. > > > > > > > > It should be relatively simple to update the fault_info table for the level -1 > > > > faults, but given the other issues we're seeing I think it's probably worth > > > > dropping the LPA2 patches for the moment. > > > > > > > > > > Thanks for the analysis Mark. > > > > > > I agree that this should not be difficult to fix, but given the other > > > CI problems and identified loose ends, I am not going to object to > > > dropping this partially or entirely at this point. I'm sure everybody > > > will be thrilled to go over those 60 patches again after I rebase them > > > onto v6.7-rc1 :-) > > > > I am happy to test any proposed fix patch. > > > > Thanks Naresh. Patch attached. This patch did not solve the reported problem. Test log links, - https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/naresh/tests/2XTP1lXcUUscT357YaAm2G1AhpS - Naresh
