linux-kernel - Re: Regression: Failed boots bisected to 4cd13c21b207 "softirq: Let ksoftirqd do its job"

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Date:   Wed, 23 Nov 2016 12:03:28 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Brian Starkey <brian.starkey@....com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Potapenko <glider@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: Regression: Failed boots bisected to 4cd13c21b207 "softirq: Let
 ksoftirqd do its job"

On Wed, Nov 23, 2016 at 10:21 AM, Brian Starkey <brian.starkey@....com> wrote:

> This patch didn't help.
>
> I did get some new traces though - I've attached the diff for the
> trace_printks I added.
>
> Before 4cd13c21b207:
> https://drive.google.com/open?id=0B8siaK6ZjvEwcEtOeFQzTmY0Nnc
> After 4cd13c21b207:
> https://drive.google.com/open?id=0B8siaK6ZjvEwZnQ4MVg1d3d1Tm8
>
> It looks like the difference is that after 4cd13c21b207 the RX softirq
> isn't running, and RX interrupts don't call softirq_raise anymore -
> presumably because there's one pending, but I didn't have time to
> track that down to a code-path.
>
> Cheers,
> -Brian
>

Hi Brian

Looks like netif_rx() drops the incoming packets then ?

Maybe netif_running() is not happy :(

Could you trace netif_rx() return value (NET_RX_SUCCESS or NET_RX_DROP)

Thanks !