From: Corinna Vinschen <vinschen@redhat.com>
To: Lin Ma <linma@zju.edu.cn>
Cc: pmenzel@molgen.mpg.de, ast@kernel.org, hawk@kernel.org,
daniel@iogearbox.net, netdev@vger.kernel.org,
richardcochran@gmail.com, john.fastabend@gmail.com,
jesse.brandeburg@intel.com, stable@vger.kernel.org,
linux-kernel@vger.kernel.org, edumazet@google.com,
anthony.l.nguyen@intel.com, intel-wired-lan@lists.osuosl.org,
kuba@kernel.org, pabeni@redhat.com, davem@davemloft.net,
regressions@lists.linux.dev
Subject: Re: [Intel-wired-lan] [PATCH] igb: revert rtnl_lock() that causes deadlock
Date: Tue, 7 Mar 2023 14:45:02 +0100 [thread overview]
Message-ID: <ZAc/3oVos9DBx3iR@calimero.vinschen.de> (raw)
In-Reply-To: <20230307130547.31446-1-linma@zju.edu.cn>
On Mar 7 21:05, 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]
>
> The above race will never happen and the extra rtnl_lock causes deadlock
> below
> [...]
> CC: stable@vger.kernel.org
> Fixes: 6faee3d4ee8b ("igb: Add lock to avoid data race")
> Reported-by: Corinna <vinschen@redhat.com>
Thank you, but "Corinna Vinschen", please.
Thanks,
Corinna
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next prev parent reply other threads:[~2023-03-07 13:45 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-07 9:54 [Intel-wired-lan] Deadlock since commit 6faee3d4ee8b ("igb: Add lock to avoid data race") Corinna Vinschen
2023-03-07 10:12 ` [Intel-wired-lan] [REGRESSION] " Paul Menzel
2023-03-07 10:19 ` Paul Menzel
2023-03-07 10:36 ` Lin Ma
2023-03-07 12:11 ` Corinna Vinschen
2023-03-07 12:37 ` Lin Ma
2023-03-07 12:55 ` Corinna Vinschen
2023-03-07 11:48 ` Lin Ma
2023-03-07 13:05 ` [Intel-wired-lan] [PATCH] igb: revert rtnl_lock() that causes deadlock Lin Ma
2023-03-07 13:17 ` Linux regression tracking (Thorsten Leemhuis)
2023-03-07 13:45 ` Corinna Vinschen [this message]
2023-03-07 15:29 ` [Intel-wired-lan] [PATCH v2] " Lin Ma
2023-03-07 16:27 ` Corinna Vinschen
2023-03-07 23:22 ` Jacob Keller
2023-03-08 12:04 ` Simon Horman
2023-03-16 9:10 ` Romanowski, Rafal
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