42 lines
1.8 KiB
Markdown
42 lines
1.8 KiB
Markdown
---
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id: "bug-1871"
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status: "investigating"
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status_updated: "2026-09-27"
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status_note: "found while soak-verifying the HA group; logs in /home/claude/tmp/xce-ha-final-force-snapshot"
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component: "lib"
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severity: "unknown"
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timestamp: "2026-09-27T07:03:48Z"
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last_seen: "2026-09-27T07:03:48Z"
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occurrences: 1
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files: ["src/lib/netio.c (endpoint_block_tasks/unblock", "handle_input)", "src/controller/ha.c ha_handle_snapshot_chunk"]
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tags: ["netio", "epoll", "snapshot", "latency", "ha", "soak"]
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related: ["bug-1870"]
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legacy: true
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gitea_issue: 297
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gitea_synced_status: "investigating"
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gitea_synced_hash: "e0ba41ca7ee9"
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---
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# bug-1871: HA snapshot transfer to a rejoining standby stalls mid-stream: primary queues all chunks at once…
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## Description
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HA snapshot transfer to a rejoining standby stalls mid-stream: primary queues all chunks at once (528KB, 9 chunks); the standby reads a few (1 or 5 of 9 in two runs), its endpoint is unblocked after the last processed chunk, and then no further input event arrives on that connection for 3s+ although the primary has more chunks queued -- --force-snapshot soak's single post-convergence check saw no install (2 of 4 runs, 2026-09-27)
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## Environment
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_Not recorded (migrated from buglog.json)._
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## Reproduction
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_Not recorded (migrated from buglog.json)._
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## Root cause
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Not root-caused. Suspect: edge-triggered epoll input + per-endpoint task blocking (netio endpoint_block_tasks): data that arrives while the endpoint is blocked is not re-signalled after endpoint_unblock_tasks, so reading resumes only on the next write from the peer (e.g. the next heartbeat). Likely delays, not loses, the transfer; the soak check was changed to poll 30s.
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## Fix
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_Not recorded (migrated from buglog.json)._
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## Verification
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_Not recorded (migrated from buglog.json)._
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## References
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- Related: bug-1870
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- Gitea: #297
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