Julien Palard added the comment:
Some (most?) of them looks to be unicode strings, and according to the very end
of the main function:
#ifdef __INSURE__
/* Insure++ is a memory analysis tool that aids in discovering
* memory leaks and other memory problems. On Python exit, the
* interned string dictionaries are flagged as being in use at exit
* (which it is). Under normal circumstances, this is fine because
* the memory will be automatically reclaimed by the system. Under
* memory debugging, it's a huge source of useless noise, so we
* trade off slower shutdown for less distraction in the memory
* reports. -baw
*/
_Py_ReleaseInternedUnicodeStrings();
#endif /* __INSURE__ */
So, to ensure everything is as expected, I compiled with the __INSURE__ flag,
and got:
releasing 1894 interned strings
total size of all interned strings: 17945/0 mortal/immortal
ASAN:DEADLYSIGNAL
=================================================================
==23814==ERROR: AddressSanitizer: SEGV on unknown address 0x0000000000a0 (pc
0x5575b1c16904 bp 0x7ffe1c4f1f60 sp 0x7ffe1c4f1f40 T0)
#0 0x5575b1c16903 in list_dealloc
(/home/mdk/Downloads/cpython/python+0x524903)
#1 0x5575b1bf287d in _Py_Dealloc
(/home/mdk/Downloads/cpython/python+0x50087d)
#2 0x5575b1c3daca in _Py_ReleaseInternedUnicodeStrings
(/home/mdk/Downloads/cpython/python+0x54baca)
#3 0x5575b206c0d3 in Py_Main (/home/mdk/Downloads/cpython/python+0x97a0d3)
#4 0x5575b206d1d2 in main (/home/mdk/Downloads/cpython/python+0x97b1d2)
#5 0x7f5ed0b622b0 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x202b0)
#6 0x5575b1b1f8d9 in _start (/home/mdk/Downloads/cpython/python+0x42d8d9)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/home/mdk/Downloads/cpython/python+0x524903)
in list_dealloc
==23814==ABORTING
Which in this case does not looks normal.
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<http://bugs.python.org/issue31200>
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