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Date:   Wed, 26 Aug 2020 15:49:36 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] mptcp: free acked data before waiting for more

From: Florian Westphal <>
Date: Wed, 26 Aug 2020 01:31:05 +0200

> After subflow lock is dropped, more wmem might have been made available.
> This fixes a deadlock in 'mmap' mode: wmem is exhausted.
> But as the mptcp socket holds on to already-acked data (for retransmit)
> no wakeup will occur.
> Using 'goto restart' calls mptcp_clean_una(sk) which will free pages
> that have been acked completely in the mean time.
> Fixes: fb529e62d3f3 ("mptcp: break and restart in case mptcp sndbuf is full")
> Signed-off-by: Florian Westphal <>

Applied and queued up for -stable, thanks.

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