netdev - Re: [RFC] can: can_create_echo_skb(): fix echo skb generation: always use skb

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Date:   Mon, 3 Feb 2020 20:06:28 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        dev.kurt@...dijck-laurijssen.be, Netdev <netdev@...r.kernel.org>,
        lkft-triage@...ts.linaro.org, linux-can@...r.kernel.org,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        wg@...ndegger.com
Subject: Re: [RFC] can: can_create_echo_skb(): fix echo skb generation: always
 use skb_clone()

On Mon, 3 Feb 2020 at 19:22, Marc Kleine-Budde <mkl@...gutronix.de> wrote:
>
> On 2/3/20 2:48 PM, Marc Kleine-Budde wrote:
> >>> WARNING: CPU: 0 PID: 293 at lib/refcount.c:25 refcount_warn_saturate+0x108/0x174
> >>> refcount_t: addition on 0; use-after-free.
> >>
> >> FYI,
> >> This issue noticed in our Linaro test farm
> >> On linux next version 5.5.0-next-20200203 running on beagleboard x15 arm device.
> >>
> >> Thanks for providing fix for this case.
>
> Please look closely at your backtraces, they are totally unrelated. It
> seems the whole culprit in your testcase fails with:
>
> > [    0.000000] OF: ERROR: Bad of_node_put() on /ocp/interconnect@...00000/segment@...arget-module@...0/cm_core@...4per-cm@...0/l4per-clkctrl@28

I have reported on another email regarding this dtb issue.

>
> ...the rest are subsequent faults.
>
> > Can we add your Tested-by to the patch?

We generally test linux mainline, linux-next, LTS 5.4, 4.19, 4.14, 4.9
and 4.4 branches.
When issue like this found and with a proposed fix patch.
I do schedule it for apply patch and test and report it back on email thread.

- Naresh