linux-kernel - Re: [PATCH net v4] ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT

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Message-Id: 
 <176709360580.3217338.10030913382633316233.git-patchwork-notify@kernel.org>
Date: Tue, 30 Dec 2025 11:20:05 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Jiayuan Chen <jiayuan.chen@...ux.dev>
Cc: netdev@...r.kernel.org,
 syzbot+9b35e9bc0951140d13e6@...kaller.appspotmail.com, davem@...emloft.net,
 dsahern@...nel.org, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 horms@...nel.org, bigeasy@...utronix.de, clrkwllms@...nel.org,
 rostedt@...dmis.org, tglx@...utronix.de, linux-kernel@...r.kernel.org,
 linux-rt-devel@...ts.linux.dev
Subject: Re: [PATCH net v4] ipv6: fix a BUG in rt6_get_pcpu_route() under
 PREEMPT_RT

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@...hat.com>:

On Tue, 23 Dec 2025 13:14:12 +0800 you wrote:
> On PREEMPT_RT kernels, after rt6_get_pcpu_route() returns NULL, the
> current task can be preempted. Another task running on the same CPU
> may then execute rt6_make_pcpu_route() and successfully install a
> pcpu_rt entry. When the first task resumes execution, its cmpxchg()
> in rt6_make_pcpu_route() will fail because rt6i_pcpu is no longer
> NULL, triggering the BUG_ON(prev). It's easy to reproduce it by adding
> mdelay() after rt6_get_pcpu_route().
> 
> [...]

Here is the summary with links:
  - [net,v4] ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT
    https://git.kernel.org/netdev/net/c/1adaea51c61b

You are awesome, thank you!
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