linux-kernel - Re: [LTP] mmstress[1309]: segfault at 7f3d71a36ee8 ip 00007f3d77132bdf sp 00007f3d71a36ee8 error 4 in libc-2.27.so[7f3d77058000+1aa000]

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Date:   Fri, 23 Oct 2020 14:15:53 -0700
From:   Song Liu <song@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Daniel Díaz <daniel.diaz@...aro.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        X86 ML <x86@...nel.org>,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        linux-mm <linux-mm@...ck.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Ingo Molnar <mingo@...hat.com>, LTP List <ltp@...ts.linux.it>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [LTP] mmstress[1309]: segfault at 7f3d71a36ee8 ip
 00007f3d77132bdf sp 00007f3d71a36ee8 error 4 in libc-2.27.so[7f3d77058000+1aa000]

On Fri, Oct 23, 2020 at 10:51 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Fri, Oct 23, 2020 at 10:00 AM Naresh Kamboju
> <naresh.kamboju@...aro.org> wrote:
> >
> > [Old patch from yesterday]
> >
> > After applying your patch on top on linux next tag 20201015
> > there are two observations,
> >   1) i386 build failed. please find build error build
>
> Yes, this was expected. That patch explicitly only works on x86-64,
> because 32-bit needs the double register handling for 64-bit values
> (mainly loff_t).
>
> >   2) x86_64 kasan test PASS and the reported error not found.
>
> Ok, good. That confirms that the problem you reported is indeed the
> register allocation.
>
> The patch I sent an hour ago (the one based on Rasmus' one from
> yesterday) should fix things too, and - unlike yesterday's - work on
> 32-bit.
>
> But I'll wait for confirmation (and hopefully a sign-off from Rasmus
> so that I can give him authorship) before actually committing it.
>
>               Linus

My test vm failed to boot since

commit d55564cfc222326e944893eff0c4118353e349ec
x86: Make __put_user() generate an out-of-line call

The patch also fixed it.

Thanks!
Song