On Fri, Feb 11, 2022 at 12:33:36PM +1100, Stephen Rothwell wrote:
> Hi Luis,
>
> On Thu, 10 Feb 2022 15:19:09 -0800 Luis Chamberlain <mcgrof@xxxxxxxxxx> wrote:
> >
> > FWIW Linus merged a more newer version of the regression fix, and only
> > until today did we get that version on linux-next.
> >
> > > So it seems that the parent of "fs/binfmt_misc" is a permanently empty
> > > directory - the is_empty_dir() check in insert_header() succeeds.
> >
> > I am not seeing this issue on x86_64 KVM guest with:
> >
> > CONFIG_BINFMT_MISC=m
> > or
> > CONFIG_BINFMT_MISC=y
> >
> > I think the issue might be that linux-next has Andrew's earlier
> > version of the fix merged, and Linus now has the new version. So
> > linux-next has these extra things below. But I can't understand
> > why this is seen on ppc and not on x86_64.
> >
> > diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> > index 241cfc6bc36f..788b9a34d5ab 100644
> > --- a/kernel/sysctl.c
> > +++ b/kernel/sysctl.c
> > @@ -2735,17 +2735,6 @@ static struct ctl_table vm_table[] = {
> > { }
> > };
> >
> > -static struct ctl_table fs_table[] = {
> > -#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
> > - {
> > - .procname = "binfmt_misc",
> > - .mode = 0555,
> > - .child = sysctl_mount_point,
> > - },
> > -#endif
> > - { }
> > -};
> > -
> > static struct ctl_table debug_table[] = {
> > #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
> > {
> > @@ -2765,7 +2754,6 @@ static struct ctl_table dev_table[] = {
> >
> > DECLARE_SYSCTL_BASE(kernel, kern_table);
> > DECLARE_SYSCTL_BASE(vm, vm_table);
> > -DECLARE_SYSCTL_BASE(fs, fs_table);
> > DECLARE_SYSCTL_BASE(debug, debug_table);
> > DECLARE_SYSCTL_BASE(dev, dev_table);
> >
> > @@ -2773,7 +2761,6 @@ int __init sysctl_init_bases(void)
> > {
> > register_sysctl_base(kernel);
> > register_sysctl_base(vm);
> > - register_sysctl_base(fs);
> > register_sysctl_base(debug);
> > register_sysctl_base(dev);
> >
>
> Thanks for noticing that. I have removed the old version from my copy
> of mmotm today.
And ... does that fix your boot?
Luis
