Travis: failed to bind to port 11211 #10869

1. 
   jnewbery commented at 5:16 pm on July 18, 2017: member

   Looks like a spurious Travis failure in p2p-segwit.py here: https://travis-ci.org/bitcoin/bitcoin/jobs/254520908#L5356

   02017-07-17 19:06:34.660901 Unable to bind to 0.0.0.0:11211 on this computer. Bitcoin Core is probably already running.
   

   test_runner.py and test_framework.py are very careful to not re-use ports for p2p and rpc interfaces on different nodes/tests, so perhaps another process was bound to 11211. Googling for port 11211 shows that it’s memcached’s default port.

   Should be easy to test whether port 11211 causes problems by pushing a branch with port_seed() changed.

2. fanquake added the label Tests on Jul 21, 2017
3. 
   laanwj commented at 12:11 pm on July 27, 2017: member

   Most intermittent failures with ports could be avoided by using UNIX sockets for testing, too bad that that didn’t make it.
4. MarcoFalke added the label Priority Low on Nov 10, 2017
5. 
   MarcoFalke commented at 9:55 pm on November 10, 2017: member

   The most simple work around would be to stop picking 11211:

    0diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
    1index acca72aa8..43f689df5 100644
    2--- a/test/functional/test_framework/util.py
    3+++ b/test/functional/test_framework/util.py
    4@@ -164,5 +164,5 @@ def satoshi_round(amount):
    5 MAX_NODES = 8
    6 # Don't assign rpc or p2p ports lower than this
    7-PORT_MIN = 11000
    8+PORT_MIN = 11222
    9 # The number of ports to "reserve" for p2p and rpc, each
   10 PORT_RANGE = 5000
   

6. laanwj removed the label Priority Low on Dec 6, 2017
7. 
   MarcoFalke commented at 8:04 pm on April 11, 2018: member

   @jnewbery Do you think this issue is worth to tackle/keep open?
8. jnewbery added the label Up for grabs on Apr 11, 2018
9. 
   jnewbery commented at 8:14 pm on April 11, 2018: member

   Setting ‘Up for grabs’. Next steps, for anyone who wants this:

   • confirm that it really is port 11211 that causes problems.
   • fix using Marco’s workaround or some other way.
10. jnewbery closed this on Apr 11, 2018

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11. MarcoFalke removed the label Up for grabs on Jun 3, 2018
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Contributors
jnewbery laanwj MarcoFalke

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