From: Erhard Furtner <erhard_f@mailbox.org>
To: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: Several kmemleak reports + "refcount_t: underflow; use-after-free" at boot when OF_UNITTEST + OF_OVERLAY is set (Kernel v6.6-rc6, PowerMac G5 11,2)
Date: Tue, 31 Oct 2023 17:46:46 +0100 [thread overview]
Message-ID: <20231031174646.3d4e1447@yea> (raw)
In-Reply-To: <CAL_Jsq+qcc7ERmGAywp=7oGT=XGoBsMO839_jtzxeNcCN-dS_A@mail.gmail.com>
On Mon, 30 Oct 2023 11:26:48 -0500
Rob Herring <robh@kernel.org> wrote:
> The test tells you to expect a use-after-free...
>
> > ---[ end trace <<int>> ]--- ### dt-test ### pass of_unittest_lifecycle():3209
> > ------------[ cut here ]------------
> > refcount_t: underflow; use-after-free.
>
> Then you get a use-after-free. Looks like it is working as designed.
>
> I believe it's the same with kmemleak.
>
> Note that running DT unittests also taints the kernel. That's because
> they are not meant to be run on a production system.
>
> Rob
My bad, did not realize this is actually intended behaviour... Sorry for the noise!
Regards,
Erhard
WARNING: multiple messages have this Message-ID (diff)
From: Erhard Furtner <erhard_f@mailbox.org>
To: Rob Herring <robh@kernel.org>
Cc: linuxppc-dev@lists.ozlabs.org, devicetree@vger.kernel.org
Subject: Re: Several kmemleak reports + "refcount_t: underflow; use-after-free" at boot when OF_UNITTEST + OF_OVERLAY is set (Kernel v6.6-rc6, PowerMac G5 11,2)
Date: Tue, 31 Oct 2023 17:46:46 +0100 [thread overview]
Message-ID: <20231031174646.3d4e1447@yea> (raw)
In-Reply-To: <CAL_Jsq+qcc7ERmGAywp=7oGT=XGoBsMO839_jtzxeNcCN-dS_A@mail.gmail.com>
On Mon, 30 Oct 2023 11:26:48 -0500
Rob Herring <robh@kernel.org> wrote:
> The test tells you to expect a use-after-free...
>
> > ---[ end trace <<int>> ]--- ### dt-test ### pass of_unittest_lifecycle():3209
> > ------------[ cut here ]------------
> > refcount_t: underflow; use-after-free.
>
> Then you get a use-after-free. Looks like it is working as designed.
>
> I believe it's the same with kmemleak.
>
> Note that running DT unittests also taints the kernel. That's because
> they are not meant to be run on a production system.
>
> Rob
My bad, did not realize this is actually intended behaviour... Sorry for the noise!
Regards,
Erhard
next prev parent reply other threads:[~2023-10-31 16:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-18 21:38 Several kmemleak reports + "refcount_t: underflow; use-after-free" at boot when OF_UNITTEST + OF_OVERLAY is set (Kernel v6.6-rc6, PowerMac G5 11,2) Erhard Furtner
2023-10-29 15:40 ` Erhard Furtner
2023-10-30 16:26 ` Rob Herring
2023-10-30 16:26 ` Rob Herring
2023-10-31 16:46 ` Erhard Furtner [this message]
2023-10-31 16:46 ` Erhard Furtner
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