netdev - Re: net/sched - kernel crashes when replacing a qdisc node.

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Message-ID: <20240103180426.2db116ea@kernel.org>
Date: Wed, 3 Jan 2024 18:04:26 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Kui-Feng Lee <sinquersw@...il.com>
Cc: netdev@...r.kernel.org, victor@...atatu.com, jhs@...atatu.com,
 xiyou.wangcong@...il.com, jiri@...nulli.us, pctammela@...atatu.com, "David
 S. Miller" <davem@...emloft.net>, Andrii Nakryiko <andrii@...nel.org>,
 Alexei Starovoitov <ast@...nel.org>, Martin KaFai Lau
 <martin.lau@...ux.dev>, Kernel Team <kernel-team@...a.com>
Subject: Re: net/sched - kernel crashes when replacing a qdisc node.

On Wed, 3 Jan 2024 17:41:54 -0800 Kui-Feng Lee wrote:
> The kernel crashes when running selftests/bpf/prog_tests/lwt_reroute.c. 
> We got the error message at end of this post.
> 
> It happens when lwt_reroute.c running the shell command
> 
>    tc qdisc replace dev tun0 root fq limit 5 flow_limit 5
> 
> The kernel crashes at the line
> 
>    block = cl_ops->tcf_block(sch, TC_H_MIN_INGRESS, NULL);

This is the same as
https://lore.kernel.org/all/20231231172320.245375-1-victor@mojatatu.com/#r
right?