netdev - Re: [PATCH] igb: revert rtnl_lock() that causes deadlock

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Date:   Tue, 7 Mar 2023 14:17:56 +0100
From:   "Linux regression tracking (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
To:     Lin Ma <linma@....edu.cn>, jesse.brandeburg@...el.com,
        anthony.l.nguyen@...el.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        richardcochran@...il.com, ast@...nel.org, daniel@...earbox.net,
        hawk@...nel.org, john.fastabend@...il.com
Cc:     intel-wired-lan@...ts.osuosl.org, pmenzel@...gen.mpg.de,
        regressions@...ts.linux.dev, vinschen@...hat.com,
        stable@...r.kernel.org
Subject: Re: [PATCH] igb: revert rtnl_lock() that causes deadlock

On 07.03.23 14:05, Lin Ma wrote:
> The commit 6faee3d4ee8b ("igb: Add lock to avoid data race") adds
> rtnl_lock to eliminate a false data race shown below
> 
>  (FREE from device detaching)      |   (USE from netdev core)
> igb_remove                         |  igb_ndo_get_vf_config
>  igb_disable_sriov                 |  vf >= adapter->vfs_allocated_count?
>   kfree(adapter->vf_data)          |
>   adapter->vfs_allocated_count = 0 |
>                                    |    memcpy(... adapter->vf_data[vf]
> 
> [...]
> CC: stable@...r.kernel.org
> Fixes: 6faee3d4ee8b ("igb: Add lock to avoid data race")
> Reported-by: Corinna <vinschen@...hat.com>
> Link: https://lore.kernel.org/regressions/3ef31c0b-ce40-20d0-7740-5dc0cca278ca@molgen.mpg.de/

FWIW, that afaics should be:

Link:
https://lore.kernel.org/intel-wired-lan/ZAcJvkEPqWeJHO2r@calimero.vinschen.de/

(that's the parent of the mail above)

> Signed-off-by: Lin Ma <linma@....edu.cn>

Ciao, Thorsten