fixed possible memory travel

[nshestakov]

Changelog entry

Fixed possible memory travel when balancing a topic reading session
#16017
...

Changelog category

• Bugfix

Description for reviewers

...

[github-actions]

🟢 2025-03-20 13:23:20 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-03-20 13:23:33 UTC Pre-commit check linux-x86_64-release-asan for a974122 has started.
⚪ 2025-03-20 13:23:47 UTC Artifacts will be uploaded here
⚪ 2025-03-20 13:26:33 UTC ya make is running...
🟡 2025-03-20 14:37:29 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
12122	11942	0	119	24	37

⚪ 2025-03-20 14:38:35 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-03-20 14:57:22 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
235 (only retried tests)	188	0	1	12	34

⚪ 2025-03-20 14:57:33 UTC ya make is running... (failed tests rerun, try 3)
🟡 2025-03-20 15:16:03 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Test history | Ya make output | Test bloat | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
75 (only retried tests)	38	0	1	2	34

🟢 2025-03-20 15:16:11 UTC Build successful.
🟢 2025-03-20 15:16:42 UTC ydbd size 3.8 GiB changed* by -779.1 KiB, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 15dc990	merge: a974122	diff	diff %
ydbd size	4 072 757 096 Bytes	4 071 959 248 Bytes	-779.1 KiB	-0.020%
ydbd stripped size	1 408 839 176 Bytes	1 408 718 472 Bytes	-117.9 KiB	-0.009%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-03-20 16:19:08 UTC Pre-commit check linux-x86_64-relwithdebinfo for a974122 has started.
⚪ 2025-03-20 16:19:24 UTC Artifacts will be uploaded here
⚪ 2025-03-20 16:22:14 UTC ya make is running...
🟡 2025-03-20 17:21:25 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
19625	18245	0	3	1259	118

⚪ 2025-03-20 17:23:22 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-03-20 17:59:26 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
198 (only retried tests)	60	0	3	26	109

⚪ 2025-03-20 17:59:36 UTC ya make is running... (failed tests rerun, try 3)
🟢 2025-03-20 18:12:48 UTC Tests successful.

Test history | Ya make output | Test bloat | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
179 (only retried tests)	74	0	0	0	105

🟢 2025-03-20 18:13:00 UTC Build successful.
🟢 2025-03-20 18:13:25 UTC ydbd size 2.2 GiB changed* by -272 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 00995cf	merge: a974122	diff	diff %
ydbd size	2 313 317 144 Bytes	2 313 316 872 Bytes	-272 Bytes	-0.000%
ydbd stripped size	484 266 592 Bytes	484 266 592 Bytes	0 Bytes	0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}