Re: linux-next: objtool hang/loop?

[Randy Dunlap]

On 8/4/21 11:34 AM, Josh Poimboeuf wrote:
> On Wed, Jul 28, 2021 at 07:25:21PM -0700, Randy Dunlap wrote:
> > Hi Josh & Peter,
> >
> > Yesterday (2021-07-27), one of my x86_64 randconfig build ran for
> > over 2 hours (it's a slow core i5 laptop and spinning rust media).
> > I killed it and reran the .config file today on linux-next-20210728.
> > I killed this one after 30 minutes on its last message:
> >    OBJTOOL vmlinux.o
> >
> > This is a .config with # CONFIG_MODULES is not set.
> > vmlinux.o is 253 MB in size.
> > I see that using verbose make (V=1) won't help me any here.
> >
> > The problematic (if it is a problem: maybe I didn't wait long
> > enough?) .config file is attached.  The gzipped vmlinux.o file is at:
> >    http://www.infradead.org/~rdunlap/vmlinux.o.gz
> >
> > If there is a problem, I can test any patches...
>
> Hi Randy,
>
> I'm guessing your laptop doesn't have a lot of RAM.  I ran

Hey, it has a whopping 6 GB of RAM. :)

>    /usr/bin/time -v tools/objtool/objtool check --noinstr --vmlinux --no-fp --uaccess vmlinux.o
>
> It showed a max RSS of 6.5GB.
>
> Can you try this patch from Peter?  It halves the memory usage.
>
>    https://lkml.kernel.org/r/20210507164925.GC54801@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Yes, that fixes the problem for me. Thanks.

Acked-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Tested-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

--
~Randy