linux: Add version 6.12.23

[donald]

No description provided.

[pmenzel]

Yout beat me to it. ;-) I already checked out the branch this morning.

Now that pahole is in MarIuX, it’d be great, if you could built the BTF (BPF Type Format) encoded debug information, so that we can use ptcpdump.

[donald]

With CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y, CONFIG_DEBUG_INFO_BTF=y:

 LD      vmlinux.o
  OBJCOPY modules.builtin.modinfo
  GEN     modules.builtin
  GEN     .vmlinux.objs
  MODPOST Module.symvers
  CC      .vmlinux.export.o
  UPD     include/generated/utsversion.h
  CC      init/version-timestamp.o
  KSYMS   .tmp_vmlinux0.kallsyms.S
  AS      .tmp_vmlinux0.kallsyms.o
  LD      .tmp_vmlinux1
  BTF     .tmp_vmlinux1.btf.o
die__process: DW_TAG_compile_unit, DW_TAG_type_unit, DW_TAG_partial_unit or DW_TAG_skeleton_unit expected got INVALID (0x0) @ 115a59b!
error decoding cu 
pahole: .tmp_vmlinux1: Invalid argument
  NM      .tmp_vmlinux1.syms
  KSYMS   .tmp_vmlinux1.kallsyms.S
  AS      .tmp_vmlinux1.kallsyms.o
  LD      .tmp_vmlinux2
  NM      .tmp_vmlinux2.syms
  KSYMS   .tmp_vmlinux2.kallsyms.S
  AS      .tmp_vmlinux2.kallsyms.o
  LD      vmlinux
  BTFIDS  vmlinux
libbpf: failed to find '.BTF' ELF section in vmlinux
FAILED: load BTF from vmlinux: No data available
make[2]: *** [scripts/Makefile.vmlinux:34: vmlinux] Error 255
make[2]: *** Deleting file 'vmlinux'
make[1]: *** [/scratch/local/linux/Makefile:1179: vmlinux] Error 2
make: *** [Makefile:224: __sub-make] Error 2

Just tried, no time for debugging right now. Any idea?

[pmenzel]

Just tried, no time for debugging right now. Any idea?

Unfortunately, I do not. Sorry for wasting your time. I am going to do more tests next week.

[pmenzel]

For next week from Reddit:

You need BTF debug info enabled for BTF to be found correctly but debug needs to be setup correctly.
Debug compressed needs to be disabled, split debugging disabled, struct randomization for gcc disabled ect.
There are other options that will block or interfere with debugging for btf.

[donald]

What exactly do we need this for?

[pmenzel]

What exactly do we need this for?

To fully use eBPF. For example, ptcpdump is able to also show the process ids. I do not know the details, but it needs the BTF symbols.