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Date: Wed, 8 Sep 2021 10:20:50 +0200
From: Florian Westphal <fw@strlen.de>
To: Mat Martineau <mathew.j.martineau@linux.intel.com>
Cc: Florian Westphal <fw@strlen.de>, mptcp@lists.linux.dev
Subject: Re: [mptcp-next 0/2] Fix mptcp connection hangs after link failover
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References: <20210906131045.18513-1-fw@strlen.de>
 <e7135787-ee9c-dcef-d569-ceee8a3298b4@linux.intel.com>
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Mat Martineau <mathew.j.martineau@linux.intel.com> wrote:
> On Mon, 6 Sep 2021, Florian Westphal wrote:
> 
> > First patch is preparation work: tx_pending_data counter is unreliable.
> > Second patch fixes premature stop of the retransmit timer.
> > 
> > Florian Westphal (2):
> >  mptcp: remove tx_pending_data
> >  mptcp: re-set push-pending bit on retransmit failure
> > 
> > net/mptcp/protocol.c | 32 +++++++++++++++++++++++++-------
> > net/mptcp/protocol.h |  1 -
> > 2 files changed, 25 insertions(+), 8 deletions(-)
> > 
> > -- 
> > 2.32.0
> 
> The code changes look ok, and I don't see any copyfd_io_poll errors. But I
> do get consistent failures in the same group of self tests related to stale
> links and recovery:
> 
> 15 multiple flows, signal, link failure syn[ ok ] - synack[ ok ] - ack[ ok ]
>                                         add[ ok ] - echo  [ ok ]
>                                         stale             [fail] got 0
> stale[s] 0 recover[s],   expected stale in range [1..5],  stale-recover
> delta 1

I'm on export, 9c7d1b9a14eba479466423d64f99c8a4e29b66f4, with these two
patches and I don't see this error.

Running mptcp_join -l in a loop now, no luck so far.