Created attachment 2154428 [details]
dmesg log

1. Please describe the problem:
sched_ext BPF schedulers (scx_bpfland, scx_lavd, etc.) fail to load
with "func_proto incompatible with vmlinux" error. The kernel's vmlinux
BTF has malformed sched_ext kfunc prototypes — KF_IMPLICIT_ARGS kfuncs
still carry the implicit 'struct bpf_prog_aux *' (aux) argument in their
public BTF prototype.

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2. What is the Version-Release number of the kernel:
This affects both Fedora 44 (kernel 7.1.8-200.fc44) and Fedora 45
Rawhide (kernel 7.2.0-0.rc6.260807gf9a2394a2348.52.fc45), confirmed
by testing both.

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3. Did it work previously in Fedora? If so, what kernel version did the issue
   *first* appear?  Old kernels are available for download at
   https://koji.fedoraproject.org/koji/packageinfo?packageID=8 :
Last time I checked I was on kernel 6.19 and it worked then. I checked now after a while and I am on 7.1.8. The KF_IMPLICIT_ARGS kfunc issue was introduced in Linux 7.0.

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4. Can you reproduce this issue? If so, please provide the steps to reproduce
   the issue below:

When running on 7.1.8 (stable Fedora 44 kernel) or when using the Linux 7.2.0-0.rc6.260807gf9a2394a2348.52.fc45.x86_64 kernel from Koji while testing. 

Terminal command:
sudo scx_bpfland -m auto

Ouput:
17:25:44 [INFO] NUMA nodes: 1
17:25:44 [INFO] Disabling NUMA optimizations
17:25:44 [INFO] scx_bpfland 1.1.2 x86_64-unknown-linux-gnu SMT on
17:25:44 [INFO] scheduler options: scx_bpfland -m auto
17:25:44 [INFO] scheduler flags: 0x36
Error: the running kernel's BTF has malformed scx kfunc prototype(s): __scx_bpf_dsq_insert_vtime, __scx_bpf_select_cpu_and, scx_bpf_cid_override, scx_bpf_cid_to_cpu, scx_bpf_cidperf_set, scx_bpf_cpu_curr, scx_bpf_cpuperf_cap, scx_bpf_cpuperf_cur, scx_bpf_dispatch_cancel, scx_bpf_dispatch_nr_slots, scx_bpf_dsq_insert___v2, scx_bpf_dsq_move_to_local___v2, scx_bpf_dsq_nr_queued, scx_bpf_dsq_peek, scx_bpf_error_bstr, scx_bpf_exit_bstr, scx_bpf_get_idle_cpumask, scx_bpf_kick_cid, scx_bpf_pick_any_cpu_node, scx_bpf_pick_idle_cpu, scx_bpf_select_cpu_dfl, scx_bpf_test_and_clear_cpu_idle.

These kfuncs are KF_IMPLICIT_ARGS but their public BTF prototype
still carries the implicit 'struct bpf_prog_aux *' argument, which
makes BPF programs fail to load with 'func_proto incompatible with
vmlinux'. This happens when the kernel was built with pahole < 1.26.

Fix: boot a kernel whose BTF was generated with pahole >= 1.26.
Affected distros include Ubuntu 24.04 LTS. See kernel commit
9edd04c4189e ("docs: Raise minimum pahole version to 1.26 for
KF_IMPLICIT_ARGS kfuncs").

Caused by:
    0: Failed to load BPF program
    1: Invalid argument (os error 22)

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5. Does this problem occur with the latest Rawhide kernel? To install the
   Rawhide kernel, run ``sudo dnf install fedora-repos-rawhide`` followed by
   ``sudo dnf update --enablerepo=rawhide kernel``:
Yes, see above.

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6. Are you running any modules that not shipped with directly Fedora's kernel?:
No out-of-tree modules.

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7. Please attach the kernel logs. You can get the complete kernel log
   for a boot with ``journalctl --no-hostname -k > dmesg.txt``. If the
   issue occurred on a previous boot, use the journalctl ``-b`` flag.

Attached.