test: failure in mining_basic.py AssertionError: not(4.656542373906924E-10 == 4.656542373906925E-10) #32515

1. 
   fanquake commented at 2:33 pm on May 15, 2025: member

   x86_64 Alpine Linux master @ c779ee3a4044df3a263394bbb8b104aeeaa7c727

    0/bitcoin # build/test/functional/test_runner.py mining_basic.py --valgrind --timeout-factor=0
    1Temporary test directory at /tmp/test_runner_₿_🏃_20250515_142647
    2Remaining jobs: [mining_basic.py]
    31/1 - mining_basic.py failed, Duration: 58 s                                                                        
    4
    5stdout:
    62025-05-15T14:26:48.007000Z TestFramework (INFO): PRNG seed is: 1679234749093477821
    72025-05-15T14:26:48.008000Z TestFramework (INFO): Initializing test directory /tmp/test_runner_₿_🏃_20250515_142647/mining_basic_0
    82025-05-15T14:26:57.860000Z TestFramework (INFO): Create some old blocks
    92025-05-15T14:27:19.347000Z TestFramework (INFO): test blockversion
   102025-05-15T14:27:45.954000Z TestFramework (INFO): getmininginfo
   112025-05-15T14:27:46.014000Z TestFramework (ERROR): Assertion failed
   12Traceback (most recent call last):
   13  File "/bitcoin/test/functional/test_framework/test_framework.py", line 183, in main
   14    self.run_test()
   15  File "/bitcoin/build/test/functional/mining_basic.py", line 392, in run_test
   16    assert_equal(mining_info['difficulty'], Decimal('4.656542373906925E-10'))
   17  File "/bitcoin/test/functional/test_framework/util.py", line 77, in assert_equal
   18    raise AssertionError("not(%s)" % " == ".join(str(arg) for arg in (thing1, thing2) + args))
   19AssertionError: not(4.656542373906924E-10 == 4.656542373906925E-10)
   202025-05-15T14:27:46.067000Z TestFramework (INFO): Not stopping nodes as test failed. The dangling processes will be cleaned up later.
   212025-05-15T14:27:46.067000Z TestFramework (WARNING): Not cleaning up dir /tmp/test_runner_₿_🏃_20250515_142647/mining_basic_0
   222025-05-15T14:27:46.067000Z TestFramework (ERROR): Test failed. Test logging available at /tmp/test_runner_₿_🏃_20250515_142647/mining_basic_0/test_framework.log
   232025-05-15T14:27:46.067000Z TestFramework (ERROR): 
   242025-05-15T14:27:46.067000Z TestFramework (ERROR): Hint: Call /bitcoin/test/functional/combine_logs.py '/tmp/test_runner_₿_🏃_20250515_142647/mining_basic_0' to consolidate all logs
   252025-05-15T14:27:46.067000Z TestFramework (ERROR): 
   262025-05-15T14:27:46.067000Z TestFramework (ERROR): If this failure happened unexpectedly or intermittently, please file a bug and provide a link or upload of the combined log.
   272025-05-15T14:27:46.068000Z TestFramework (ERROR): https://github.com/bitcoin/bitcoin/issues
   282025-05-15T14:27:46.068000Z TestFramework (ERROR):
   

   Verbose logs are available here: https://gist.github.com/fanquake/e2f2e4eba103d883e23801b154af45f2

2. fanquake added the label Tests on May 15, 2025
3. 
   maflcko commented at 5:23 pm on May 15, 2025: member

   What are the exact steps to reproduce? It passes for me: https://cirrus-ci.com/task/6221957416353792?logs=functional_test#L92
4. 
   maflcko commented at 5:24 pm on May 15, 2025: member

   Oh, you are saying this only happens under valgrind?
5. 
   fanquake commented at 8:04 am on May 16, 2025: member

   Yea. Have only seen it under Valgrind.

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