[exim-dev] [Bug 2907] New: TCP bogus retries after TFO

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Autor: admin
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Para: exim-dev
Asunto: [exim-dev] [Bug 2907] New: TCP bogus retries after TFO
https://bugs.exim.org/show_bug.cgi?id=2907

            Bug ID: 2907
           Summary: TCP bogus retries after TFO
           Product: Exim
           Version: N/A
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: bug
          Priority: medium
         Component: Transports
          Assignee: unallocated@???
          Reporter: jgh146exb@???
                CC: exim-dev@???


Multiple people are reporting intermittent delivery failures to Google.

The syndrome is, for a fairly large message, a hang at the end of data
transmission. Exim never gets an SMTP-level ack for the data. This can
be either DATA or BDAT.

A packet capture obtained is implying a Linux kernel bug, either in the TCP
implementation or transmit-offload to the NIC. I'm treating this as a tracking
bug at this time.

Disabling use of TFO (in the smtp transport) seems to be a sufficient
workaround. It happens that Google is the major SMTP peer supporting TFO,
but I would expect the issue to affect any such peer.

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