Re: vmlinux.o: warning: objtool: do_machine_check()+0x5fa: call to memset() leaves .noinstr.text section

From: Jakub Kicinski
Date: Wed Jan 19 2022 - 13:22:55 EST


On Tue, 26 Oct 2021 10:23:30 +0200 Borislav Petkov wrote:
> On Tue, Oct 26, 2021 at 04:16:21PM +0800, kernel test robot wrote:
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head: 3906fe9bb7f1a2c8667ae54e967dc8690824f4ea
> > commit: 7bb39313cd6239e7eb95198950a02b4ad2a08316 x86/mce: Make mce_timed_out() identify holdout CPUs
> > date: 10 months ago
> > config: x86_64-buildonly-randconfig-r006-20211022 (attached as .config)
> > compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> > reproduce (this is a W=1 build):
> > # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7bb39313cd6239e7eb95198950a02b4ad2a08316
> > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> > git fetch --no-tags linus master
> > git checkout 7bb39313cd6239e7eb95198950a02b4ad2a08316
> > # save the attached .config to linux build tree
> > mkdir build_dir
> > make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@xxxxxxxxx>
> >
> > All warnings (new ones prefixed by >>):
>
> if you have the technical capability to ignore all noinstr warnings
> coming from the mce code, please do so.
>
> I have a patchset to address that but more important work preempts me
> constantly from cleaning it up and sending it out properly. ;-\

Any progress? Anything I can help with?

I was hoping that 5.17 would fix this but I just merged Linus's tree
with netdev today and the warnings are still there :(