linux-kernel - Re: linux-next: Tree for Apr 10 (lib/test

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Message-ID: <CAFd5g46ZaEVoMb2hO94A41Z=YH6ntTdXstZUhHu67mwOKY+QsA@mail.gmail.com>
Date:   Tue, 14 Apr 2020 12:26:29 -0700
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: Re: linux-next: Tree for Apr 10 (lib/test_printf.ko)

On Sat, Apr 11, 2020 at 11:22 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> On 4/11/20 10:36 PM, Naresh Kamboju wrote:
> > FYI,
> >
> > Is this problem related to,
> >
> > Regression reported on Linux next 5.6.0-rc4-next-20200305 on x86_64,
> > i386, arm and arm64. The steps to reproduce is running kselftests lib
> > printf.sh test case.
> > Which is doing modprobe operations.
> >
> > BUG: kernel NULL pointer dereference, address: 00 - ida_free+0x76/0x140
> >
> > https://lore.kernel.org/linux-kselftest/CAFd5g46Bwd8HS9-xjHLh_rB59Nfw8iAnM6aFe0QPcveewDUT6g@mail.gmail.com/T/
> >
>
> Looks similar. Lots of fwnode, software_node, ida stuff there.

Sorry for the late reply, I was out.

Yeah, I am pretty sure it is the same. Heikki proposed a fix that I am
going to try.

Also, I think I am going to send out a new test case for this that can
live with the fwnode, software_node stuff. It would be nice if the
printf test wasn't the only thing testing this stuff.

Thanks!