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Date:   Thu, 22 Jul 2021 15:16:06 -0700
From:   Stephen Hemminger <>
Subject: Fw: [Bug 213827] New: Stall In TCP/IP

Begin forwarded message:

Date: Thu, 22 Jul 2021 22:03:50 +0000
Subject: [Bug 213827] New: Stall In TCP/IP

            Bug ID: 213827
           Summary: Stall In TCP/IP
           Product: Networking
           Version: 2.5
    Kernel Version: Observed 5.9.2. Confirmed on 5.12 and 5.13
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
        Regression: No

Created attachment 298007
A basic repro of the observed issue.

We see an unexpected pause of 3-60 seconds where the test no longer receives
data, recv() is blocking, netstat shows data is sitting in the 7777 server's
send queue and 0 bytes are in the test's receive queue.

Setting net.core.rmem_max seems to be a key factor. For our testing we used

See attached README and repro.

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