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Type: Bug
Resolution: Fixed
Priority: Major - P3
Fix Version/s: WT12.0.0, 9.0.0-rc0
Affects Version/s: None
Component/s: Reconciliation
Labels:
- elegant-stepdown

Assigned Teams:

Storage Engines - Transactions
Total Hours with Assigned Team:
432.281
Epic Link:
Disagg Bugs
Sprint:
SE Transactions - 2026-07-03
Story Points:
5

Context

This bug was discovered during testing on the dedicated elegant step-down feature branch https://github.com/wiredtiger/wiredtiger/compare/develop...wt-17785-enable-elegant-stepdown-mainine. Currently, step-down restarts for test/format. In this branch, we are replacing the restart with a synchronous, elegant step-down triggered via reconfigure(role=follower). This ticket captures one of the bugs as a result of elegant stepdown.

Evergreen Task / Link

https://spruce.mongodb.com/version/6a28f82d40102300072af7f8/tasks

Logs & Stack Trace

file:T00001.wt_stable, eviction-server: [WT_VERB_DEFAULT][ERROR]: __wt_reconcile, 72: WiredTiger assertion failed: '!((((btree)->flags) & (0x0200000u)) != 0)'. Attempting reconciliation on a read-only page
file:T00001.wt_stable, eviction-server: [WT_VERB_DEFAULT][ERROR]: __wt_abort, 29: aborting WiredTiger library

is duplicated by

WT-17816 test/format (mode=switch) [Elegant stepdown bugs] Evicting dirty internal pages for disaggregated storage is not allowed

Closed

WT-17818 test/format (mode=switch) [Elegant stepdown bugs] Follower evicts page with disagg_info (ref->page->disagg_info == NULL || leader)

Closed

is related to

WT-17819 test/format (mode=switch) [Elegant stepdown bugs] No corresponding value exists on the stable table to delete

Open

WT-17844 test/format (mode=switch) [Elegant stepdown bugs] The stable btree should not contain inserts prior to draining

Open

WT-17817 test/format (mode=switch) [Elegant stepdown bugs] Ingest drain finds stable btree in unexpected state (preserved prepared updates / inserts before drain)

In Progress

WT-17820 test/format (mode=switch) [Elegant stepdown bugs] SIGSEGV in __split_internal_unlock during eviction from layered drain worker

In Progress

WT-17816 test/format (mode=switch) [Elegant stepdown bugs] Evicting dirty internal pages for disaggregated storage is not allowed

Closed

WT-17818 test/format (mode=switch) [Elegant stepdown bugs] Follower evicts page with disagg_info (ref->page->disagg_info == NULL || leader)

Closed

WT-16879 Fix the potential data race between open btree or open dhandle and primary step down

Open

(4 is related to)

Assignee:: Shoufu Du
Reporter:: Sid Mahajan
Votes:: 0 Vote for this issue
Watchers:: 4 Start watching this issue

Created:: Jun 10 2026 06:20:11 AM UTC
Updated:: Jul 01 2026 01:32:32 PM UTC
Resolved:: Jun 29 2026 05:41:39 AM UTC

Details

Description

Context

Evergreen Task / Link

Logs & Stack Trace

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