linux-kernel - Re: [PATCH net v4] netpoll: Fix deadlock in memory allocation under spinlock

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Message-Id: 
 <176231400725.3077655.17370020528592249644.git-patchwork-notify@kernel.org>
Date: Wed, 05 Nov 2025 03:40:07 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Breno Leitao <leitao@...ian.org>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, horms@...nel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH net v4] netpoll: Fix deadlock in memory allocation under
 spinlock

Hello:

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

On Mon, 03 Nov 2025 08:38:17 -0800 you wrote:
> Fix a AA deadlock in refill_skbs() where memory allocation while holding
> skb_pool->lock can trigger a recursive lock acquisition attempt.
> 
> The deadlock scenario occurs when the system is under severe memory
> pressure:
> 
> 1. refill_skbs() acquires skb_pool->lock (spinlock)
> 2. alloc_skb() is called while holding the lock
> 3. Memory allocator fails and calls slab_out_of_memory()
> 4. This triggers printk() for the OOM warning
> 5. The console output path calls netpoll_send_udp()
> 6. netpoll_send_udp() attempts to acquire the same skb_pool->lock
> 7. Deadlock: the lock is already held by the same CPU
> 
> [...]

Here is the summary with links:
  - [net,v4] netpoll: Fix deadlock in memory allocation under spinlock
    https://git.kernel.org/netdev/net/c/327c20c21d80

You are awesome, thank you!
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