langgraph

mirror of https://github.com/langchain-ai/langgraph.git synced 2026-08-23 16:12:25 +02:00

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T

Sydney RunkleandClaude Sonnet 4.6 d5507cb53c fix(checkpoint/postgres): pass cursor to avoid deadlock in diff chain traversal

Fixes a critical deadlock that occurs when _load_diff_chains calls self._cursor()
from within _load_blobs while the outer _load_checkpoint_tuple already holds
self._cursor(). On bare (non-pool) connections, the threading.Lock is not
reentrant, causing a deadlock.

Solution: Pass the cursor as a parameter to _load_diff_chains and _load_blobs
instead of acquiring a new cursor within those methods. Updated _load_checkpoint_tuple
to acquire a cursor once at the top level and pass it through the call chain.

Changes:
- Updated _load_blobs signature to accept optional cur parameter
- Updated _load_diff_chains signature (base and implementations) to accept optional cur parameter
- Modified _load_checkpoint_tuple in PostgresSaver to acquire cursor and pass it
- Modified _load_checkpoint_tuple_async to acquire cursor only when diff_payloads exist
- Removed nested self._cursor() calls in _load_diff_chains and _load_diff_chains_async

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-04-30 14:44:39 -04:00

checkpoint

feat(checkpoint/postgres): diff chain reconstruction in _load_blobs (sync)

2026-04-30 14:44:39 -04:00

checkpoint-conformance

chore(deps): bump langsmith from 0.7.3 to 0.7.31 in /libs/checkpoint-conformance (#7523 )

2026-04-15 19:36:27 -07:00

checkpoint-postgres

fix(checkpoint/postgres): pass cursor to avoid deadlock in diff chain traversal

2026-04-30 14:44:39 -04:00

checkpoint-sqlite

chore(deps): bump langsmith from 0.6.4 to 0.7.31 in /libs/checkpoint-sqlite (#7524 )