Em Mon, Oct 29, 2018 at 04:26:27PM +0100, Milian Wolff escreveu: > On Monday, October 29, 2018 3:16:44 PM CET Milian Wolff wrote: > > Libdwfl parses an ELF file itself and creates mappings for the > > individual sections. Perf on the other hand sees raw mmap events which > > represent individual sections. When we encounter an address pointing > > into a mapping with pgoff != 0, we must take that into account and > > report the file at the non-offset base address. > > > > This fixes unwinding with libdwfl in some cases. E.g. for a file like: > > <snip> > > > Note that the backtrace is still stopping too early, when > > compared to the nice results obtained via libunwind. It's > > unclear so far what the reason for that is. > > The remaining issue is due to a bug in elfutils: > > https://sourceware.org/ml/elfutils-devel/2018-q4/msg00089.html > > With both patches applied, libunwind and elfutils produce the same output for > the above scenario.
I'm updating the patch to remove: "It's unclear so far what the reason for that is." Adding: "See https://sourceware.org/ml/elfutils-devel/2018-q4/msg00089.html for a patch fixing that." Ok? Or are you saying that that "unclear" part applies to both libunwind and elfutils? - Arnaldo
