Hi Arnaldo, On Tue, Jan 02, 2024 at 01:30:02PM -0300, Arnaldo Carvalho de Melo wrote: > Em Thu, Dec 28, 2023 at 10:34:04AM -0700, Nathan Chancellor escreveu: > > On Thu, Dec 28, 2023 at 11:21:06AM -0300, Arnaldo Carvalho de Melo wrote: > > > Em Wed, Dec 27, 2023 at 03:43:38PM -0700, Nathan Chancellor escreveu: > > > > I do not get a segfault personally but there are definitely a lot of > > > > errors from pahole at the end. Arnaldo, is pahole not handling something > > > > that it should with regards to clang's debug info? > > > > Possibly, would it be possible to provide the vmlinux file where pahole > > > is segfaulting when trying to encode BTF from DWARF? > > > > These two files: > > > > vmlinux drivers/misc/eeprom/at24.ko > > > > So that I can run: > > > LLVM_OBJCOPY="llvm-objcopy" pahole -J --btf_gen_floats -j --lang_exclude=rust --skip_encoding_btf_inconsistent_proto --btf_gen_optimized --btf_base vmlinux drivers/misc/eeprom/at24.ko > > > Sure, here you go: > > > https://1drv.ms/u/s!AsQNYeB-IEbqqAilUuGHOU8BMLbf > > > If you need more objects, just let me know. That series of commands in > > the previous email should also get them for you locally if you need all > > of them or want to investigate more. > > llvm-dwarfdump is the only that is managing to process this file on a > fedora:39 system, more work needed to figure out if this is something > elfutils is planning to support, what amount of work would be necessary, > etc. > > Mark, do you know about work on elfutils to support: > > ⬢[acme@toolbox hexagon-randconfig-r005-20220913-pahole-crash]$ llvm-dwarfdump at24.ko | head -22 > at24.ko: file format elf32-hexagon That seems to identify itself as an EM_QDSP6 (QUALCOMM DSP6) 32bit ELF file. Neither binutils not elfutils seems to know how to resolve EM_QDSP6 specific relocations. Normally that wouldn't be necessary, but sadly kernel modules are still ET_REL files, so eu-readelf/readelf needs relocations resolved to process the DWARF .debug sections. This seems to need Qualcomm to upstream support for this processor type to bintuils and elfutils. Cheers, Mark
