Em Mon, Nov 09, 2020 at 11:32:13AM +0100, Jiri Olsa escreveu: > On Mon, Nov 09, 2020 at 05:57:37PM +0800, Ming Lei wrote: > > On Thu, Nov 5, 2020 at 12:58 PM Amy Parker <enbyamy@xxxxxxxxx> wrote: > > > > > > On all attempts to build the 5.10 tree (from either release candidate, > > > Linus's tree, Greg's tree, etc), the build crashes on the BTFID vmlinux > > > stage. I've tested this on several different devices with completely > > > different hardware and kernel configs. The symbol for vfs_getattr > > > appears to be missing. Compiles for all of these work on any compile > > > on any 5.9 tree. I've tested all 4 5.9 dot-releases as well as the first > > > two and last two release candidates and Greg's staging tree. > > > The specific error is: > > > BTFIDS vmlinux > > > FAILED unresolved symbol vfs_getattr > > > make: *** [Makefile:1164: vmlinux] Error 255 > > > Any thoughts as to what's causing this? The main machine I'm > > > compiling with is running kernel 5.8.17 with dwarves 1.17. My > > > kernel config is attached as `kernel_config`. > > Turns out the issue is introduced in the following commit: > > commit 6e22ab9da79343532cd3cde39df25e5a5478c692 > > Author: Jiri Olsa <jolsa@xxxxxxxxxx> > > Date: Tue Aug 25 21:21:20 2020 +0200 > > bpf: Add d_path helper > > The issue can be observed reliably when building kernel in Fedora 33 with > > F33's kernel config. > > GCC: gcc version 10.2.1 20200826 (Red Hat 10.2.1-3) (GCC) > hi, > it's gcc dwarf issue tracked in here: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97060 > it's introduced by the gcc version 10.2.1 and we > were told it will take some time to fix > so we took steps to workaround that, the patchset > just got acked and it's on its way to get merged: > https://lore.kernel.org/bpf/20201106222512.52454-1-jolsa@xxxxxxxxxx/ > it's change for both dwarves/pahole and kernel > the quick workaround is to disable CONFIG_DEBUG_INFO_BTF > option I've applied the series and I'm now testing it, will tag v1.19 then. - Arnaldo
