[issue28700] test_dbm failure: KeyError: b'0' (regression in 3.6)

[Greg Ward]

Greg Ward added the comment:

As suggested in http://bugs.python.org/issue14120, I installed libgdbm-dev, 
re-configured, and re-compiled. That fixes the problem.

IMHO that's not good enough: if we're missing a dependency, then either 
configuring or building should fail. It's nice that the test failure is now 
rock-solid reliable rather than intermittent, but it's still a test failure due 
to missing dependency. Yuck.

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[issue28700] test_dbm failure: KeyError: b'0' (regression in 3.6)

[Greg Ward]

Greg Ward added the comment:

Forgot to mention: I'm running:

No LSB modules are available.
Distributor ID: Ubuntu
Description:Ubuntu 16.04.1 LTS
Release:16.04
Codename:   xenial

with

$ dpkg-query -W | grep dbm
libgdbm3:amd64  1.8.3-13.1

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[issue28700] test_dbm failure: KeyError: b'0' (regression in 3.6)

[Greg Ward]

New submission from Greg Ward:

test_dbm.py fails reliably for me in 3.6, but in 3.5 it passes ~80% of the 
time. The failure in both cases is KeyError: b'0', which has come up previously 
in http://bugs.python.org/issue20094 and http://bugs.python.org/issue14120.

But since we've switched from 20% failure rate to 100% failure rate, I figured 
something must have changed. I used "hg bisect" to track it down to a recent 
commit: 

changeset:   103360:0bd618fe0639
user:Victor Stinner 
date:Wed Sep 07 17:40:12 2016 -0700
summary: Implement compact dict

Here is how it fails:

$ ./python -m test -v test_dbm 
== CPython 3.6.0a4+ (default:0bd618fe0639, Nov 15 2016, 14:07:07) [GCC 5.4.0 
20160609]
==   Linux-4.4.0-47-generic-x86_64-with-debian-stretch-sid little-endian
==   hash algorithm: siphash24 64bit
==   /home/data/src/cpython/3.6/build/test_python_10093
Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, 
dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=0, 
verbose=0, bytes_warning=0, quiet=0, hash_randomization=1, isolated=0)
Run tests sequentially
0:00:00 [1/1] test_dbm
test_keys (test.test_dbm.WhichDBTestCase) ... ok
test_whichdb (test.test_dbm.WhichDBTestCase) ... ok
test_whichdb_ndbm (test.test_dbm.WhichDBTestCase) ... BDB0004 fop_read_meta: 
@test_10093_tmp_ndbm.db: unexpected file type or format
ok
test_anydbm_access (test.test_dbm.TestCase-dbm.ndbm) ... ok
test_anydbm_creation (test.test_dbm.TestCase-dbm.ndbm) ... ERROR
BDB3028 @test_10093_tmp.db: unable to flush: No such file or directory
test_anydbm_creation_n_file_exists_with_invalid_contents 
(test.test_dbm.TestCase-dbm.ndbm) ... ok
test_anydbm_keys (test.test_dbm.TestCase-dbm.ndbm) ... ok
test_anydbm_modification (test.test_dbm.TestCase-dbm.ndbm) ... ERROR
BDB3028 @test_10093_tmp.db: unable to flush: No such file or directory
test_anydbm_not_existing (test.test_dbm.TestCase-dbm.ndbm) ... ok
test_anydbm_read (test.test_dbm.TestCase-dbm.ndbm) ... ERROR
test_error (test.test_dbm.TestCase-dbm.ndbm) ... ok
test_anydbm_access (test.test_dbm.TestCase-dbm.dumb) ... ok
test_anydbm_creation (test.test_dbm.TestCase-dbm.dumb) ... ok
test_anydbm_creation_n_file_exists_with_invalid_contents 
(test.test_dbm.TestCase-dbm.dumb) ... ok
test_anydbm_keys (test.test_dbm.TestCase-dbm.dumb) ... ok
test_anydbm_modification (test.test_dbm.TestCase-dbm.dumb) ... ok
test_anydbm_not_existing (test.test_dbm.TestCase-dbm.dumb) ... ok
test_anydbm_read (test.test_dbm.TestCase-dbm.dumb) ... ok
test_error (test.test_dbm.TestCase-dbm.dumb) ... ok

==
ERROR: test_anydbm_creation (test.test_dbm.TestCase-dbm.ndbm)
--
Traceback (most recent call last):
  File "/home/data/src/cpython/3.6/Lib/test/test_dbm.py", line 73, in 
test_anydbm_creation
self.read_helper(f)
  File "/home/data/src/cpython/3.6/Lib/test/test_dbm.py", line 114, in 
read_helper
self.assertEqual(self._dict[key], f[key.encode("ascii")])
KeyError: b'0'

==
ERROR: test_anydbm_modification (test.test_dbm.TestCase-dbm.ndbm)
--
Traceback (most recent call last):
  File "/home/data/src/cpython/3.6/Lib/test/test_dbm.py", line 88, in 
test_anydbm_modification
self.read_helper(f)
  File "/home/data/src/cpython/3.6/Lib/test/test_dbm.py", line 114, in 
read_helper
self.assertEqual(self._dict[key], f[key.encode("ascii")])
KeyError: b'0'

==
ERROR: test_anydbm_read (test.test_dbm.TestCase-dbm.ndbm)
--
Traceback (most recent call last):
  File "/home/data/src/cpython/3.6/Lib/test/test_dbm.py", line 94, in 
test_anydbm_read
self.read_helper(f)
  File "/home/data/src/cpython/3.6/Lib/test/test_dbm.py", line 114, in 
read_helper
self.assertEqual(self._dict[key], f[key.encode("ascii")])
KeyError: b'0'

--
Ran 19 tests in 0.052s

FAILED (errors=3)
test test_dbm failed
test_dbm failed

1 test failed:
test_dbm

Total duration: 77 ms
Tests result: FAILURE

--
components: Tests
messages: 280877
nosy: gward
priority: normal
severity: normal
status: open
title: test_dbm failure: KeyError: b'0' (regression in 3.6)
type: behavior
versions: Python 3.6

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