On 23.01.2023 12:35:41, Chris Ward wrote: > The 5.15.0 kernel (built by 'git checkout v5.15' from the kernel.org > torvalds tree) fails in the same way that the 6.2.0-rc5+ kernel fails. > So it seems that something Canonical did for the Ubuntu 20.04 kernel > causes eBPF to work correctly. > > On Mon, 23 Jan 2023 at 11:06, Chris Ward <tjcw01@xxxxxxxxx> wrote: > > > > I am trying to use the 'bleeding edge' kernel to determine whether a > > problem I see has already been fixed, but with this kernel the eBPF > > verifier will not load the dispatcher program that is contained within > > libxdp. I am testing kernel commit hash 2475bf0 which fails, and the > > kernel in Ubuntu 22.04 (5.15.0-58-generic) works properly. I am > > running the test case from > > https://github.com/tjcw/bpf-examples/tree/tjcw-explore-sameeth ; to > > build it go to the AF_XDP-filter directory and type 'make', and to run > > it go to the AF_XDP-filter/runscripts/iperf3-namespace directory and > > type 'sudo FILTER=af_xdp_kern PORT=50000 ./run.sh' . > > The lines from the run output indicating the failure are > > libbpf: prog 'xdp_dispatcher': BPF program load failed: Invalid argument > > libbpf: prog 'xdp_dispatcher': -- BEGIN PROG LOAD LOG -- > > Func#11 is safe for any args that match its prototype > > btf_vmlinux is malformed > > reg type unsupported for arg#0 function xdp_dispatcher#29 > > 0: R1=ctx(off=0,imm=0) R10=fp0 > > ; int xdp_dispatcher(struct xdp_md *ctx) > > 0: (bf) r6 = r1 ; R1=ctx(off=0,imm=0) > > R6_w=ctx(off=0,imm=0) > > 1: (b7) r0 = 2 ; R0_w=2 > > ; __u8 num_progs_enabled = conf.num_progs_enabled; > > 2: (18) r8 = 0xffffb2f6c06d8000 ; R8_w=map_value(off=0,ks=4,vs=84,imm=0) > > 4: (71) r7 = *(u8 *)(r8 +0) ; R7=1 > > R8=map_value(off=0,ks=4,vs=84,imm=0) > > ; if (num_progs_enabled < 1) > > 5: (15) if r7 == 0x0 goto pc+141 ; R7=1 > > ; ret = prog0(ctx); > > 6: (bf) r1 = r6 ; R1_w=ctx(off=0,imm=0) > > R6=ctx(off=0,imm=0) > > 7: (85) call pc+140 > > btf_vmlinux is malformed > > R1 type=ctx expected=fp > > Caller passes invalid args into func#1 > > processed 84 insns (limit 1000000) max_states_per_insn 0 total_states > > 9 peak_states 9 mark_read 1 > > -- END PROG LOAD LOG -- > > libbpf: prog 'xdp_dispatcher': failed to load: -22 > > libbpf: failed to load object 'xdp-dispatcher.o' > > libxdp: Failed to load dispatcher: Invalid argument > > libxdp: Falling back to loading single prog without dispatcher > > > > Can this regression be fixed before kernel 6.2 ships ? I'm seeing the same failure on 32 bit ARM on v6.13. Have you found a solution? regards, Marc -- Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung Nürnberg | Phone: +49-5121-206917-129 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-9 |
Attachment:
signature.asc
Description: PGP signature
