Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18;
Date:   Thu, 10 Mar 2022 22:09:28 +0000
From:   "Russell King (Oracle)" <linux@armlinux.org.uk>
To:     Ard Biesheuvel <ardb@kernel.org>
Cc:     Naresh Kamboju <naresh.kamboju@linaro.org>,
        open list <linux-kernel@vger.kernel.org>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Corentin Labbe <clabbe.montjoie@gmail.com>,
        Stephen Rothwell <sfr@canb.auug.org.au>
Subject: Re: [next] arm: Internal error: Oops: 5 PC is at
 __read_once_word_nocheck
Message-ID: <Yip3GJDbJIYNeg44@shell.armlinux.org.uk>
References: <CAMj1kXE02HH7vRUjF3iKAL+1idKTy-oOYyGnBd3g90m6eObBxg@mail.gmail.com>
 <YikByJteDEtKi4Xv@shell.armlinux.org.uk>
 <CAMj1kXGnwbe=YYWaRxaXioEfTJOdXg9JYcNddO8iifpWLRZCWg@mail.gmail.com>
 <Yinwq3Z9l0selLLS@shell.armlinux.org.uk>
 <Yin2jQqW+pUWJZ7E@shell.armlinux.org.uk>
 <CAMj1kXGkUJ=-4oA4GvBZNK94A1MrZ7UwKDN_tJRgwq8KF06VmA@mail.gmail.com>
 <CA+G9fYvEANOMekjvtu7agdVYQ_b8OMtxQdyAV2JT_vMdBU3VRA@mail.gmail.com>
 <CAMj1kXEVVZTKX_86bbTfLpFuDriV0-uwCMgSKDP+dzcD1L4XCw@mail.gmail.com>
 <CA+G9fYuO-sy+sZnhSz=A7Xm0LdSp2AT+7jCKLB33tZzK4izj3g@mail.gmail.com>
 <CAMj1kXGb_0FNU7capJEDWTZF2OegmZyBphhH8GuNqL7+YYLjZQ@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAMj1kXGb_0FNU7capJEDWTZF2OegmZyBphhH8GuNqL7+YYLjZQ@mail.gmail.com>
Sender: Russell King (Oracle) <linux@armlinux.org.uk>
Precedence: bulk

On Thu, Mar 10, 2022 at 11:06:17PM +0100, Ard Biesheuvel wrote:
> On Thu, 10 Mar 2022 at 22:50, Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
> >
> > On Fri, 11 Mar 2022 at 02:55, Ard Biesheuvel <ardb@kernel.org> wrote:
> > >
> > > On Thu, 10 Mar 2022 at 22:18, Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
> > > >
> > > > Hi Ard and Russell,
> > > >
> > > > The boot test pass on linux next-20220310 tag with  KASAN=y on BeagleBoard x15
> > > > device. but LTP cve tests reproduced the reported kernel crash  [1].
> > > > From the available historical data I can confirm that this is an
> > > > intermittent issue on
> > > > BeagleBoard x15 devices.
> > > >
> > > > OTOH, the kernel crash is always reproducible on qemu-arm with KASAN=y
> > > > while booting which has been known to fail for a long time.
> > > >
> > > > From the Ardb tree I have boot tested qemu-arm with KASAN=y the reported
> > > > kernel crash is always reproducible.
> > > >
> > > > The build steps [3] and extra Kconfigs.
> > > >
> > > > - Naresh
> > > > [1] https://lkft.validation.linaro.org/scheduler/job/4701310
> > > > [2] https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/log/
> > > > [3] https://builds.tuxbuild.com/2661dIAPUjE2DMJvye91He2gus0/tuxmake_reproducer.sh
> > >
> > > Thanks Naresh. I'm having trouble to make sense of this, though. The
> > > linked output log appears to be from a build that lacks my 'ARM:
> > > entry: fix unwinder problems caused by IRQ stacks' patch, as it
> > > doesn't show any occurrences of call_with_stack() on any of the call
> > > stacks.
> > >
> > > Do you have a link to the vmlinux and zImage files for this build?
> >
> > Yes.
> >
> > vmlinux.xz:  https://builds.tuxbuild.com/26BmIasJnAyCii0SkgbKarkF369/vmlinux.xz
> > zImage: https://builds.tuxbuild.com/26BmIasJnAyCii0SkgbKarkF369/zImage
> > System.map: https://builds.tuxbuild.com/26BmIasJnAyCii0SkgbKarkF369/System.map
> > Build log: https://builds.tuxbuild.com/26BmIasJnAyCii0SkgbKarkF369/
> >
> 
> This kernel does not appear to have
> 
> ARM: unwind: set frame.pc correctly for current-thread unwinding
> ARM: entry: fix unwinder problems caused by IRQ stacks
> ARM: Revert "unwind: dump exception stack from calling frame"
> 
> so it is expected that the same issue is still being observed.
> 
> Could you please try -next with those patches applied?

I concur, from my inspection of the above referenced vmlinux file.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!