Thread (7 messages) flat view 7 messages, 4 authors, 8d ago

Re: [PATCH net repost 1/2] net/sched: codel: bound the dropping loop per dequeue call

From: patchwork-bot+netdevbpf@kernel.org
Date: 2026-09-17 00:31:10
Also in: linux-wireless, stable

Hello:

This series was applied to netdev/net.git (main)
by Jakub Kicinski [off-list ref]:

On Sat, 12 Sep 2026 14:08:30 -0400 you wrote:
The CoDel control law schedules the next drop one interval/sqrt(count)
after the previous drop, using the configured interval
(codel_params.interval). For very small intervals the scheduled step
rounds down to zero, so the dropping loop in codel_dequeue() never
advances and drains the entire backlog under the qdisc lock in one
call - an unprivileged user can trigger a soft lockup this way.

[...]
Here is the summary with links:
  - [net,repost,1/2] net/sched: codel: bound the dropping loop per dequeue call
    https://git.kernel.org/netdev/net/c/7f4a5ec6258f
  - [net,repost,2/2] selftests/tc-testing: add codel/fq_codel interval boundary cases
    https://git.kernel.org/netdev/net/c/f6fb2ac5e19a

You are awesome, thank you!
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