Hello I've seen mention a few times that BTF information can be made available from a kernel that wasn't configured with CONFIG_DEBUG_INFO_BTF. Please can someone tell me if this is true and, if so, how I could go about accessing and using it in kernels 4.15 to 5.8? I have built the dwarves package from the github latest and run pahole with '-J' against my kernel image to no avail - it actually seg faults: ~/dwarves/build $ sudo ./pahole /boot/vmlinuz-5.3.0-1022-azure btf_elf__new: cannot get elf header. ctf__new: cannot get elf header. ~/dwarves/build $ sudo ./pahole -J /boot/vmlinuz-5.3.0-1022-azure btf_elf__new: cannot get elf header. ctf__new: cannot get elf header. Segmentation fault ~/dwarves/build $ sudo ./pahole --version v1.17 Judging by the output, I'm guessing that my kernel image isn't the right kind of file. Can someone point me in the right direction? Additionally, if this is possible, is there any documentation on the API so I could incorporate the functionality into my own programs directly? Thanks Kev
