Reproduction steps:
1. Execute command: iotop -b -n 10 &
2. Execute the command in another session: valgrind /usr/sbin/iotop -b -n 5 > iotop_test

The output information is as follows:
[root@openEuler ~]# valgrind /usr/sbin/iotop -b -n 5 > iotop_test
==13750== Memcheck, a memory error detector
==13750== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==13750== Using Valgrind-3.16.0 and LibVEX; rerun with -h for copyright info
==13750== Command: /usr/sbin/iotop -b -n 5
==13750==
==13750== Conditional jump or move depends on uninitialised value(s)
==13750== at 0x49B2C40: PyUnicode_Decode (unicodeobject.c:3488)
==13750== by 0x49B335B: unicode_new (unicodeobject.c:15465)
==13750== by 0x4982C07: type_call (typeobject.c:1014)
==13750== by 0x492CA17: _PyObject_MakeTpCall (call.c:191)
==13750== by 0x48F1863: _PyObject_VectorcallTstate (abstract.h:116)
==13750== by 0x48F1863: _PyObject_VectorcallTstate (abstract.h:103)
==13750== by 0x48F1863: PyObject_Vectorcall (abstract.h:127)
==13750== by 0x48F1863: call_function (ceval.c:5075)
==13750== by 0x48F1863: _PyEval_EvalFrameDefault (ceval.c:3518)
==13750== by 0x48EAEE7: _PyEval_EvalFrame (pycore_ceval.h:40)
==13750== by 0x48EAEE7: function_code_fastcall (call.c:330)
==13750== by 0x492CBE7: _PyObject_FastCallDictTstate (call.c:118)
==13750== by 0x492CEEB: _PyObject_Call_Prepend (call.c:489)
==13750== by 0x498A007: slot_tp_init (typeobject.c:6964)
==13750== by 0x4982C4F: type_call (typeobject.c:1026)
==13750== by 0x492CA17: _PyObject_MakeTpCall (call.c:191)
==13750== by 0x48F1863: _PyObject_VectorcallTstate (abstract.h:116)
==13750== by 0x48F1863: _PyObject_VectorcallTstate (abstract.h:103)
==13750== by 0x48F1863: PyObject_Vectorcall (abstract.h:127)
==13750== by 0x48F1863: call_function (ceval.c:5075)
==13750== by 0x48F1863: _PyEval_EvalFrameDefault (ceval.c:3518)
==13750==
==13751== Warning: invalid file descriptor 1024 in syscall close()
==13751== Warning: invalid file descriptor 1025 in syscall close()
==13751== Warning: invalid file descriptor 1026 in syscall close()
==13751== Warning: invalid file descriptor 1027 in syscall close()
==13751== Use --log-fd= to select an alternative log fd.
==13751== Warning: invalid file descriptor 1028 in syscall close()
==13751== Warning: invalid file descriptor 1029 in syscall close()
==13752== Warning: invalid file descriptor 1024 in syscall close()
==13752== Warning: invalid file descriptor 1025 in syscall close()
==13752== Warning: invalid file descriptor 1026 in syscall close()
==13752== Warning: invalid file descriptor 1027 in syscall close()
==13752== Use --log-fd= to select an alternative log fd.
==13752== Warning: invalid file descriptor 1028 in syscall close()
==13752== Warning: invalid file descriptor 1029 in syscall close()
==13750==
==13750== HEAP SUMMARY:
==13750== in use at exit: 1,069,715 bytes in 10,017 blocks
==13750== total heap usage: 589,638 allocs, 579,621 frees, 128,672,782 bytes allocated
==13750==
==13750== LEAK SUMMARY:
==13750== definitely lost: 0 bytes in 0 blocks
==13750== indirectly lost: 0 bytes in 0 blocks
==13750== possibly lost: 1,042,483 bytes in 9,894 blocks
==13750== still reachable: 27,232 bytes in 123 blocks
==13750== suppressed: 0 bytes in 0 blocks
==13750== Rerun with --leak-check=full to see details of leaked memory
==13750==
==13750== Use --track-origins=yes to see where uninitialised values come from
==13750== For lists of detected and suppressed errors, rerun with: -s
==13750== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)

Software version: python3-3.9.9 & python3.9.10  iotop-6.0

The above stack information is in Python 3.9.10 and this problem cannot be reproduced in Python 3.7.


So is it a python3  problem or an iotop problem?  How to fix it.