linux-kernel - Re: [PATCH net v2 1/1] xdp: fix xdp_return_frame() kernel BUG throw for page

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Date:   Wed, 31 Mar 2021 22:20:14 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Ong Boon Leong <boon.leong.ong@...el.com>
Cc:     ast@...nel.org, daniel@...earbox.net, davem@...emloft.net,
        kuba@...nel.org, hawk@...nel.org, john.fastabend@...il.com,
        makita.toshiaki@....ntt.co.jp, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2 1/1] xdp: fix xdp_return_frame() kernel BUG throw for
 page_pool memory model

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Wed, 31 Mar 2021 21:25:03 +0800 you wrote:
> xdp_return_frame() may be called outside of NAPI context to return
> xdpf back to page_pool. xdp_return_frame() calls __xdp_return() with
> napi_direct = false. For page_pool memory model, __xdp_return() calls
> xdp_return_frame_no_direct() unconditionally and below false negative
> kernel BUG throw happened under preempt-rt build:
> 
> [  430.450355] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/3884
> [  430.451678] caller is __xdp_return+0x1ff/0x2e0
> [  430.452111] CPU: 0 PID: 3884 Comm: modprobe Tainted: G     U      E     5.12.0-rc2+ #45
> 
> [...]

Here is the summary with links:
  - [net,v2,1/1] xdp: fix xdp_return_frame() kernel BUG throw for page_pool memory model
    https://git.kernel.org/netdev/net/c/622d13694b5f

You are awesome, thank you!
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