STINNER Victor added the comment:
I added debug traces to _PyDict_Pop(). It looks like the assertion failed after
dictresize() converts a splitted table into a combined table. After the resize,
the key '_columns_plus_names' cannot be found anymore, whereas it was found
before.
The string thing about the key '_columns_plus_names' is that I cannot see it in
the output of repr(dict).
The length of the dictionary is 7, but it looks like it contains 8 items...
Something is wrong, no?
Note: I'm not sure that my debug traces are correct, especially the number of
entries may be larger. I don't understand yet exactly the internal structure of
dictionaries.
@@ delete memoized
{'_auto_correlate': True,
'_from_obj': OrderedSet([]), '_raw_columns': [Table('t1', MetaData(bind=None),
Column('c1', Integer(), table=<t1>, primary_key=True, nullable=False),
Column('c2', String(length=30), table=<t1>), schema=None)],
'_whereclause': <sqlalchemy.sql.elements.BinaryExpression object at
0x7fffe93d1190>,
'_having': None,
'use_labels': False,
'_bind': None}
_PyDict_Pop(): ix=7, resize!
before resize:
<splitted dict 0x7fffe93cda30 used=7 keys->dk_size=16 keys->dk_nentries=8
keys->dk_usable=2 || usable=10>
index[0]=-1
index[1]=4
index[2]=-1
index[3]=-1
index[4]=0
index[5]=3
index[6]=-1
index[7]=7 <----- it looks like the entry #7 is referenced, no?
index[8]=1
index[9]=2
index[10]=-1
index[11]=-1
index[12]=-1
index[13]=-1
index[14]=5
index[15]=6
entry[0]: key='_auto_correlate', hash=-4930419206435490684
entry[1]: key='_from_obj', hash=-717737569259548376
entry[2]: key='_raw_columns', hash=6382956110151689156
entry[3]: key='_whereclause', hash=-7105285138948878507
entry[4]: key='_having', hash=-8328824464742262616
entry[5]: key='use_labels', hash=8687253172181039710
entry[6]: key='_bind', hash=-5556925267210855474
entry[7]: key='_columns_plus_names', hash=-7771762227888271625
entry[8]: key='NULL', hash=0
entry[9]: key='NULL', hash=0
object : {'_auto_correlate': True, '_from_obj': OrderedSet([]),
'_raw_columns': [Table('t1', MetaData(bind=None), Column('c1', Integer(),
table=<t1>, primary_key=True, nullable=False), Column('c2', String(length=30),
table=<t1>), schema=None)], '_whereclause':
<sqlalchemy.sql.elements.BinaryExpression object at 0x7fffe93d1190>, '_having':
None, 'use_labels': False, '_bind': None}
type : dict
***
after resize:
<combined dict 0x7fffe93cda30 used=7 keys->dk_size=32 keys->dk_nentries=7
keys->dk_usable=14 || usable=21>
index[0]=-1
index[1]=-1
index[2]=-1
index[3]=-1
index[4]=0
index[5]=-1
index[6]=-1
index[7]=-1
index[8]=1
index[9]=-1
index[10]=-1
index[11]=-1
index[12]=-1
index[13]=-1
index[14]=6
index[15]=-1
index[16]=-1
index[17]=4
index[18]=-1
index[19]=-1
index[20]=-1
index[21]=3
index[22]=-1
index[23]=-1
index[24]=-1
index[25]=2
index[26]=-1
index[27]=-1
index[28]=-1
index[29]=-1
index[30]=5
index[31]=-1 <------ no more entry #7 ???
entry[0]: key='_auto_correlate', value=True, hash=-4930419206435490684
entry[1]: key='_from_obj', value=OrderedSet([]), hash=-717737569259548376
entry[2]: key='_raw_columns', value=[Table('t1', MetaData(bind=None),
Column('c1', Integer(), table=<t1>, primary_key=True, nullable=False),
Column('c2', String(length=30), table=<t1>), schema=None)],
hash=6382956110151689156
entry[3]: key='_whereclause', value=<sqlalchemy.sql.elements.BinaryExpression
object at 0x7fffe93d1190>, hash=-7105285138948878507
entry[4]: key='_having', value=None, hash=-8328824464742262616
entry[5]: key='use_labels', value=False, hash=8687253172181039710
entry[6]: key='_bind', value=None, hash=-5556925267210855474
entry[7]: key='NULL', value='NULL', hash=0
entry[8]: key='NULL', value='NULL', hash=0
entry[9]: key='NULL', value='NULL', hash=0
entry[10]: key='NULL', value='NULL', hash=0
entry[11]: key='NULL', value='NULL', hash=0
entry[12]: key='NULL', value='NULL', hash=0
entry[13]: key='NULL', value='NULL', hash=0
entry[14]: key='NULL', value='NULL', hash=0
entry[15]: key='NULL', value='NULL', hash=0
entry[16]: key='NULL', value='NULL', hash=0
entry[17]: key='NULL', value='NULL', hash=0
entry[18]: key='NULL', value='NULL', hash=0
entry[19]: key='NULL', value='NULL', hash=0
entry[20]: key='NULL', value='NULL', hash=0
object : {'_auto_correlate': True, '_from_obj': OrderedSet([]),
'_raw_columns': [Table('t1', MetaData(bind=None), Column('c1', Integer(),
table=<t1>, primary_key=True, nullable=False), Column('c2', String(length=30),
table=<t1>), schema=None)], '_whereclause':
<sqlalchemy.sql.elements.BinaryExpression object at 0x7fffe93d1190>, '_having':
None, 'use_labels': False, '_bind': None}
type : dict
refcount: 3
python: Objects/dictobject.c:1810: _PyDict_Pop: Assertion `ix >= 0' failed.
Program received signal SIGABRT, Aborted.
0x00007ffff711f6f5 in raise () from /lib64/libc.so.6
Missing separate debuginfos, use: dnf debuginfo-install
bzip2-libs-1.0.6-20.fc24.x86_64 keyutils-libs-1.5.9-8.fc24.x86_64
krb5-libs-1.14.3-8.fc24.x86_64 libcom_err-1.42.13-4.fc24.x86_64
libselinux-2.5-9.fc24.x86_64 openssl-libs-1.0.2h-3.fc24.x86_64
pcre-8.39-3.fc24.x86_64 sqlite-libs-3.13.0-1.fc24.x86_64
xz-libs-5.2.2-2.fc24.x86_64 zlib-1.2.8-10.fc24.x86_64
(gdb) up
#1 0x00007ffff71212fa in abort () from /lib64/libc.so.6
(gdb)
#2 0x00007ffff7117f97 in __assert_fail_base () from /lib64/libc.so.6
(gdb)
#3 0x00007ffff7118042 in __assert_fail () from /lib64/libc.so.6
(gdb)
#4 0x00000000004bdfd7 in _PyDict_Pop (mp=0x7fffe93cda30,
key='_columns_plus_names', deflt=None) at Objects/dictobject.c:1810
1810 assert(ix >= 0);
(gdb) p key
$1 = '_columns_plus_names'
(gdb) l
1805 fprintf(stderr, "after resize:\n");
1806 dict_dump_key_value_table(mp);
1807 _PyObject_Dump((PyObject *)mp);
1808
1809 ix = (mp->ma_keys->dk_lookup)(mp, key, hash, &value_addr,
&hashpos);
1810 assert(ix >= 0);
1811 }
1812
1813 old_value = *value_addr;
1814 assert(old_value != NULL);
(gdb) p hash
$2 = -7771762227888271625
(gdb) print value_addr
$3 = (PyObject **) 0x0
(gdb) print value_addr
$4 = (PyObject **) 0x0
(gdb) print hashpos
$5 = 23
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28120>
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