[Backport stable-26-2-1] PR #49452: [issue-#49169] (-) Make prev-node tracing state lock-free in TExecutionContext

[ydbot]

Changelog entry

[issue-#49169] (-) Make prev-node tracing state lock-free in TExecutionContext

Description for reviewers

Original PR(s)

• PR [issue-#49169] (-) Make prev-node tracing state lock-free in TExecutionContext #49452

Metadata

• Original PR author(s): @lberserq
• Cherry-picked by: @lberserq
• Related issues: OLAP: SIGSEGV ExtractFetcherOptional (source.cpp:405) on Tpcds1 #49169 Fix trace verify #49129

Conflicts Require Manual Resolution

This PR contains merge conflicts that require manual resolution.

Files with conflicts:

• ydb/tests/stability/tests/tsan.supp

How to resolve conflicts:

git fetch origin
git checkout --track origin/cherry-pick-stable-26-2-1-260819-115457
# Resolve conflicts in files
git add .
git commit -m "Resolved merge conflicts"
git push

After resolving conflicts:

1. Fix the PR title (remove [CONFLICT] if conflicts are resolved)
2. Mark PR as ready for review

Git Cherry-Pick Log

=== Cherry-picking 709ca02 ===
Auto-merging ydb/core/tx/columnshard/engines/reader/common_reader/iterator/fetching.cpp
Auto-merging ydb/core/tx/columnshard/engines/reader/common_reader/iterator/source.cpp
Auto-merging ydb/core/tx/columnshard/engines/reader/common_reader/iterator/source.h
CONFLICT (modify/delete): ydb/tests/stability/tests/tsan.supp deleted in HEAD and modified in 709ca02856d ([issue-#49169] (-) Make prev-node tracing state lock-free in TExecutionContext (#49452)).  Version 709ca02856d ([issue-#49169] (-) Make prev-node tracing state lock-free in TExecutionContext (#49452)) of ydb/tests/stability/tests/tsan.supp left in tree.

error: could not apply 709ca02856d... [issue-#49169] (-) Make prev-node tracing state lock-free in TExecutionContext (#49452)
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

---

PR was created by cherry-pick workflow run

[github-actions]

⚪ 2026-08-19 11:56:49 UTC Pre-commit check linux-x86_64-relwithdebinfo for fd74182 has started.
⚪ 2026-08-19 11:57:31 UTC Artifacts will be uploaded here
⚪ 2026-08-19 11:59:29 UTC ya make is running...
⚫ 2026-08-19 12:14:36 UTC Check cancelled

[ydbot]

Run Extra Tests

Run additional tests for this PR. You can customize:

• Test Size: small, medium, large (default: small, medium)
• Test Targets: any directory path (default: ydb/)
• Sanitizers: ASAN, MSAN, TSAN
• Coredumps: enable for debugging (default: off)
• Additional args: custom ya make arguments

[github-actions]

⚪ 2026-08-19 12:00:30 UTC Pre-commit check linux-x86_64-release-asan for fd74182 has started.
⚪ 2026-08-19 12:00:50 UTC Artifacts will be uploaded here
⚪ 2026-08-19 12:02:09 UTC ya make is running...
⚫ 2026-08-19 12:14:39 UTC Check cancelled

[lberserq]

Conflict resolved: dropped the ydb/tests/stability/tests/tsan.supp hunk. That file does not exist on this stable branch (it is main-only and unreferenced by ydb/tests/stability/tests/ya.make), and the original PR only removed the now-obsolete race:SetPrevCategoryName suppression from it — there is nothing to backport.

The C++ part of the backport is byte-identical to the original commit 709ca02; all APIs it relies on (TCompiledGraph::GetNodes, IResourceProcessor::GetSignalCategoryName, TFetchingScriptCursor::GetPrevName returning by value) are unchanged on this branch.

[github-actions]

⚪ 2026-08-19 12:16:09 UTC Pre-commit check linux-x86_64-release-asan for 8b56039 has started.
⚪ 2026-08-19 12:16:26 UTC Artifacts will be uploaded here
⚪ 2026-08-19 12:17:48 UTC ya make is running...
🟡 2026-08-19 14:09:50 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
19487	19420	0	36	30	1

🟢 2026-08-19 14:09:58 UTC Build successful.
🟢 2026-08-19 14:10:26 UTC ydbd size 4.1 GiB changed* by +11.2 KiB, which is < 100.0 KiB vs stable-26-2-1: OK

ydbd size dash	stable-26-2-1: afd34b4	merge: 8b56039	diff	diff %
ydbd size	4 409 097 504 Bytes	4 409 108 968 Bytes	+11.2 KiB	+0.000%
ydbd stripped size	1 655 598 688 Bytes	1 655 605 600 Bytes	+6.8 KiB	+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}

[github-actions]

⚪ 2026-08-19 12:16:12 UTC Pre-commit check linux-x86_64-relwithdebinfo for 8b56039 has started.
⚪ 2026-08-19 12:16:31 UTC Artifacts will be uploaded here
⚪ 2026-08-19 12:17:58 UTC ya make is running...
🟡 2026-08-19 14:44:11 UTC Some tests failed, follow the links below. Going to retry failed tests...

Details

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
50698	47237	0	3	3443	15

⚪ 2026-08-19 14:44:44 UTC ya make is running... (failed tests rerun, try 2)
🟢 2026-08-19 14:48:15 UTC Tests successful.

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
683 (only retried tests)	677	0	0	0	6

🟢 2026-08-19 14:48:38 UTC Build successful.
🟢 2026-08-19 14:49:00 UTC ydbd size 2.5 GiB changed* by +5.1 KiB, which is < 100.0 KiB vs stable-26-2-1: OK

ydbd size dash	stable-26-2-1: afd34b4	merge: 8b56039	diff	diff %
ydbd size	2 705 331 936 Bytes	2 705 337 168 Bytes	+5.1 KiB	+0.000%
ydbd stripped size	570 920 856 Bytes	570 923 480 Bytes	+2.6 KiB	+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}