netdev - Re: [PATCH net] net/sched: Fix mirred deadlock on device recursion

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Message-Id: 
 <171340442675.27861.4405474645584745327.git-patchwork-notify@kernel.org>
Date: Thu, 18 Apr 2024 01:40:26 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Victor Nogueira <victor@...atatu.com>
Cc: edumazet@...gle.com, davem@...emloft.net, kuba@...nel.org,
 pabeni@...hat.com, jhs@...atatu.com, jiri@...nulli.us,
 xiyou.wangcong@...il.com, netdev@...r.kernel.org, renmingshuai@...wei.com,
 pctammela@...atatu.com
Subject: Re: [PATCH net] net/sched: Fix mirred deadlock on device recursion

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Mon, 15 Apr 2024 18:07:28 -0300 you wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> When the mirred action is used on a classful egress qdisc and a packet is
> mirrored or redirected to self we hit a qdisc lock deadlock.
> See trace below.
> 
> [..... other info removed for brevity....]
> [   82.890906]
> [   82.890906] ============================================
> [   82.890906] WARNING: possible recursive locking detected
> [   82.890906] 6.8.0-05205-g77fadd89fe2d-dirty #213 Tainted: G        W
> [   82.890906] --------------------------------------------
> [   82.890906] ping/418 is trying to acquire lock:
> [   82.890906] ffff888006994110 (&sch->q.lock){+.-.}-{3:3}, at:
> __dev_queue_xmit+0x1778/0x3550
> [   82.890906]
> [   82.890906] but task is already holding lock:
> [   82.890906] ffff888006994110 (&sch->q.lock){+.-.}-{3:3}, at:
> __dev_queue_xmit+0x1778/0x3550
> [   82.890906]
> [   82.890906] other info that might help us debug this:
> [   82.890906]  Possible unsafe locking scenario:
> [   82.890906]
> [   82.890906]        CPU0
> [   82.890906]        ----
> [   82.890906]   lock(&sch->q.lock);
> [   82.890906]   lock(&sch->q.lock);
> [   82.890906]
> [   82.890906]  *** DEADLOCK ***
> [   82.890906]
> [..... other info removed for brevity....]
> 
> [...]

Here is the summary with links:
  - [net] net/sched: Fix mirred deadlock on device recursion
    https://git.kernel.org/netdev/net/c/0f022d32c3ec

You are awesome, thank you!
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