Subject: Re: [PATCH net] net/sched: fix pedit partial COW leading to page cache corruption

From: Jakub Kicinski <[email-masked]>
Date: Thu, 21 May 2026 08:56:02 -0700

On Thu, 21 May 2026 17:51:25 +0200 Davide Caratti wrote:
> >  Do you know of anyone modifying payloads with pedit?  
> 
> yes: MPTCP kselftest does that on purpose, to mimic a middlebox and trigger
> DSS checksum failures [1]

As I said in another reply (looks like the ML is having a significant
lag this morning :() - we would still support it, the shared frag
tracking is just an optimization to avoid a copy. And maintaining that
optimization for an occasional CI test is not the right eng tradeoff.