netdev - Re: 5.15-rc3+ crash in fq-codel?

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Date:   Wed, 29 Sep 2021 16:42:56 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Ben Greear <greearb@...delatech.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: 5.15-rc3+ crash in fq-codel?



On 9/29/21 4:28 PM, Eric Dumazet wrote:
> 

> 
> Actually the bug seems to be in pktgen, vs NET_XMIT_CN
> 
> You probably would hit the same issues with other qdisc also using NET_XMIT_CN
> 

I would try the following patch :

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index a3d74e2704c42e3bec1aa502b911c1b952a56cf1..0a2d9534f8d08d1da5dfc68c631f3a07f95c6f77 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3567,6 +3567,7 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
        case NET_XMIT_DROP:
        case NET_XMIT_CN:
                /* skb has been consumed */
+               pkt_dev->last_ok = 1;
                pkt_dev->errors++;
                break;
        default: /* Drivers are not supposed to return other values! */