test_bitcoin and caddrdb_read failures #8069

issue paveljanik openend this issue on May 18, 2016
  1. paveljanik commented at 7:35 am on May 18, 2016: contributor

    Current master:

    0Running 194 test cases...
    1test/net_tests.cpp:94: error in "caddrdb_read": check addrman1.size() == 3 failed
    2test/net_tests.cpp:105: error in "caddrdb_read": check addrman2.size() == 3 failed
    3
    4*** 2 failures detected in test suite "Bitcoin Test Suite"
    

    @EthanHeilman ?

    I extended a debugging:

     0diff --git a/src/test/net_tests.cpp b/src/test/net_tests.cpp
     1index 6debf6a..64afbad 100644
     2--- a/src/test/net_tests.cpp
     3+++ b/src/test/net_tests.cpp
     4@@ -57,6 +57,8 @@ CDataStream AddrmanToStream(CAddrManSerializationMock& addrman)
     5     ssPeersIn << addrman;
     6     std::string str = ssPeersIn.str();
     7     vector<unsigned char> vchData(str.begin(), str.end());
     8+    cerr << "DBG: vchData.size() = " << vchData.size();
     9+    cerr << ", vchData = " << HexStr(vchData) << "\n";
    10     return CDataStream(vchData, SER_DISK, CLIENT_VERSION);
    11 }
    12
    13@@ -89,6 +91,10 @@ BOOST_AUTO_TEST_CASE(caddrdb_read)
    14         exceptionThrown = true;
    15     }
    16
    17+    if (addrman1.size() != 3)
    18+        cerr << "addrman1.size() == " << addrman1.size() << "\n";
    19+    if (exceptionThrown)
    20+        cerr << "exceptionThrown!\n";
    21     BOOST_CHECK(addrman1.size() == 3);
    22     BOOST_CHECK(exceptionThrown == false);
    23
    24@@ -99,6 +105,8 @@ BOOST_AUTO_TEST_CASE(caddrdb_read)
    25     CAddrDB adb;
    26     BOOST_CHECK(addrman2.size() == 0);
    27     adb.Read(addrman2, ssPeers2);
    28+    if (addrman2.size() != 3)
    29+        cerr << "addrman2.size() == " << addrman2.size();
    30     BOOST_CHECK(addrman2.size() == 3);
    31 }
    

    And to reproduce the problem:

    0for i in {1..100}; do ./test_bitcoin --run_test=net_tests || break ; done
    

    It looks like the serialization of CAddrMan is fragile…

  2. paveljanik commented at 7:45 am on May 18, 2016: contributor
    The nNew inside serialized format is 3 vs 2 in such simple case. Why?
  3. paveljanik commented at 8:01 am on May 18, 2016: contributor
    Hmm, in the fail case, after the third entry added to the addrmanUncorrupted (https://github.com/bitcoin/bitcoin/blob/master/src/test/net_tests.cpp#L76), the size of addrmanUncorrupted is still two! So it is not serialization related!
  4. paveljanik commented at 8:03 am on May 18, 2016: contributor
    This is new test added in the last merge commit #7696.
  5. paveljanik commented at 8:22 am on May 18, 2016: contributor

    I can reproduce the problem in plain master with addrman_simple:

    0for i in {1..100}; do ./test_bitcoin --run_test=addrman_tests || break; done
    1...
    2Running 11 test cases...
    3test/addrman_tests.cpp:87: error in "addrman_simple": check addrman.size() == 2 failed
    4
    5*** 1 failure detected in test suite "Bitcoin Test Suite"
    
  6. EthanHeilman commented at 2:40 pm on May 18, 2016: contributor
    @paveljanik Looking at this now.
  7. MarcoFalke added the label Tests on May 18, 2016
  8. EthanHeilman commented at 4:15 pm on May 18, 2016: contributor

    In regards to the net_tests failing: Addrman will evict an existing addr if it is in the same position as an existing addr. This position is determined via a hash function and a randomly picked seed (nKey). This seed is serialized and deserialized so if the Addrman which is serialized to the disk has a randomly chosen seed this will cause non-determinism down the road when it is deserialized and tested.

    For testing purposes I created a deterministic subclass of Addrman to prevent exactly these problems but it was not used in this test. I have created a pull request which resolves this issue: #8070

    In regards to the addrman_tests failing: Unlike the net_tests failure I’m unable to replicate addrman_tests failures and addrman_tests does not have the same issue as net_tests. I ran your script several times without a failure.

    0for i in {1..100}; do ./test_bitcoin --run_test=addrman_tests || break; done
    1Running 11 test cases...
    2...
    3*** No errors detected
    

    Now testing for i in {1..10000}; will post results when it finished. What system are you running?

  9. EthanHeilman commented at 7:35 pm on May 18, 2016: contributor

    Ran addrman_tests 10000 times no failures on my side:

    0for i in {1..10000}; do echo $i;./test_bitcoin --run_test=addrman_tests || break; done
    1...
    2*** No errors detected
    39999
    4Running 11 test cases...
    5*** No errors detected
    610000
    7Running 11 test cases...
    8*** No errors detected
    
  10. paveljanik commented at 7:45 pm on May 18, 2016: contributor

    @EthanHeilman The same for me now. Strange. Will investigate.

    Maybe it was a false alarm when I was debugging the net_tests problem - I could have removed MakeDeterministic() calls there…

    I can’t reproduce addrman_tests issue on plain master.

    But anyway, the original problem is fixed by #8070. Thanks!

  11. laanwj referenced this in commit 7771aa57bd on May 19, 2016
  12. paveljanik commented at 7:58 am on May 19, 2016: contributor
    Fixed by #8070, closing.
  13. paveljanik closed this on May 19, 2016

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