netdev - Re: [PATCH net v3] net: bridge: fix soft lockup in br_multicast_query

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Message-Id: 
 <175521960625.502863.7225770030306226732.git-patchwork-notify@kernel.org>
Date: Fri, 15 Aug 2025 01:00:06 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Wang Liang <wangliang74@...wei.com>
Cc: razor@...ckwall.org, idosch@...dia.com, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, horms@...nel.org,
 bridge@...ts.linux.dev, netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 yuehaibing@...wei.com, zhangchangzhong@...wei.com
Subject: Re: [PATCH net v3] net: bridge: fix soft lockup in
 br_multicast_query_expired()

Hello:

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

On Wed, 13 Aug 2025 10:10:54 +0800 you wrote:
> When set multicast_query_interval to a large value, the local variable
> 'time' in br_multicast_send_query() may overflow. If the time is smaller
> than jiffies, the timer will expire immediately, and then call mod_timer()
> again, which creates a loop and may trigger the following soft lockup
> issue.
> 
>   watchdog: BUG: soft lockup - CPU#1 stuck for 221s! [rb_consumer:66]
>   CPU: 1 UID: 0 PID: 66 Comm: rb_consumer Not tainted 6.16.0+ #259 PREEMPT(none)
>   Call Trace:
>    <IRQ>
>    __netdev_alloc_skb+0x2e/0x3a0
>    br_ip6_multicast_alloc_query+0x212/0x1b70
>    __br_multicast_send_query+0x376/0xac0
>    br_multicast_send_query+0x299/0x510
>    br_multicast_query_expired.constprop.0+0x16d/0x1b0
>    call_timer_fn+0x3b/0x2a0
>    __run_timers+0x619/0x950
>    run_timer_softirq+0x11c/0x220
>    handle_softirqs+0x18e/0x560
>    __irq_exit_rcu+0x158/0x1a0
>    sysvec_apic_timer_interrupt+0x76/0x90
>    </IRQ>
> 
> [...]

Here is the summary with links:
  - [net,v3] net: bridge: fix soft lockup in br_multicast_query_expired()
    https://git.kernel.org/netdev/net/c/d1547bf460ba

You are awesome, thank you!
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