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Subject: Re: [PATCH net] net: Fix rcu_tasks stall in threaded busypoll
From: patchwork-bot+netdevbpf@kernel.org
Message-Id: 
 <177254220530.856851.6609682429987870648.git-patchwork-notify@kernel.org>
Date: Tue, 03 Mar 2026 12:50:05 +0000
References: <20260227221937.1060857-1-zhuyifei@google.com>
In-Reply-To: <20260227221937.1060857-1-zhuyifei@google.com>
To: YiFei Zhu <zhuyifei@google.com>
Cc: kuba@kernel.org, davem@davemloft.net, edumazet@google.com,
 pabeni@redhat.com, skhawaja@google.com, netdev@vger.kernel.org,
 almasrymina@google.com, willemb@google.com, joe@dama.to,
 stable@vger.kernel.org

Hello:

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

On Fri, 27 Feb 2026 22:19:37 +0000 you wrote:
> I was debugging a NIC driver when I noticed that when I enable
> threaded busypoll, bpftrace hangs when starting up. dmesg showed:
> 
>   rcu_tasks_wait_gp: rcu_tasks grace period number 85 (since boot) is 10658 jiffies old.
>   rcu_tasks_wait_gp: rcu_tasks grace period number 85 (since boot) is 40793 jiffies old.
>   rcu_tasks_wait_gp: rcu_tasks grace period number 85 (since boot) is 131273 jiffies old.
>   rcu_tasks_wait_gp: rcu_tasks grace period number 85 (since boot) is 402058 jiffies old.
>   INFO: rcu_tasks detected stalls on tasks:
>   00000000769f52cd: .N nvcsw: 2/2 holdout: 1 idle_cpu: -1/64
>   task:napi/eth2-8265  state:R  running task     stack:0     pid:48300 tgid:48300 ppid:2      task_flags:0x208040 flags:0x00004000
>   Call Trace:
>    <TASK>
>    ? napi_threaded_poll_loop+0x27c/0x2c0
>    ? __pfx_napi_threaded_poll+0x10/0x10
>    ? napi_threaded_poll+0x26/0x80
>    ? kthread+0xfa/0x240
>    ? __pfx_kthread+0x10/0x10
>    ? ret_from_fork+0x31/0x50
>    ? __pfx_kthread+0x10/0x10
>    ? ret_from_fork_asm+0x1a/0x30
>    </TASK>
> 
> [...]

Here is the summary with links:
  - [net] net: Fix rcu_tasks stall in threaded busypoll
    https://git.kernel.org/netdev/net/c/1a86a1f7d889

You are awesome, thank you!
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