Revert "fix(unconfirmed): guard Reader status overwrite during RAC archive transitions"

This reverts commit a79f8a3cca2cf4d72cd060bb607fa088ca848f59.

Author: rophy

UPSTREAM-CHANGES.md

@@ -37,7 +37,6 @@ Multi-thread redo log processing for Oracle RAC.
 | 1a2d316b | LOB INSERT preserved from phantom undo in streaming | Transaction.cpp | [#10](https://github.com/rophy/olr/issues/10) |
 | ddf6bc04 | skip truncated URP null bitmap instead of abort | OpCode0504.cpp | — |
 | 7cbd0580 | decode ROWID column type (type# 69) | Builder.cpp, SysCol.h, BuilderJson.* | [#15](https://github.com/rophy/olr/issues/15) |
-| — | Reader status overwrite race during RAC archive transitions | Reader.cpp | [#14](https://github.com/rophy/olr/issues/14) |
 
 **Upstream PR candidates:** All — these are correctness fixes
 

src/reader/Reader.cpp

@@ -752,8 +752,7 @@ namespace OpenLogReplicator {
                 {
                     contextSet(CONTEXT::MUTEX, REASON::READER_SLEEP2);
                     std::unique_lock const lck(mtx);
-                    if (status == STATUS::READ)
-                        status = STATUS::SLEEPING;
+                    status = STATUS::SLEEPING;
                     condParserSleeping.notify_all();
                 }
                 contextSet(CONTEXT::CPU);

tests/KNOWN-LIMITATIONS.md

@@ -230,14 +230,26 @@ no output for the scenario.
 
 ---
 
-## L10. ~~OLR Crash on RAC LOB + Log Switch~~ (FIXED)
+## L10. OLR Crash on RAC LOB + Log Switch
 
-**Fixed** by guarding Reader status overwrite at `Reader.cpp:755` — only set
-`STATUS::SLEEPING` if status is still `STATUS::READ`, preserving `CHECK`/`UPDATE`
-set by other threads during the READ loop.
+OLR crashes with a null pointer dereference in `Reader.cpp:111` when
+processing heavy LOB operations spanning multiple log switches on RAC.
+
+**Evidence — test output (2026-03-16):**
+
+```
+Reader.cpp:111:21: runtime error: load of null pointer of type 'uint8_t'
+```
+
+Occurs when advancing to a new archive log sequence on thread 2 during
+`rac-lob-log-switch` scenario (40 LOB inserts + 10 updates + 10 deletes
+across both nodes).
 
 **Tracked:** [rophy/olr#14](https://github.com/rophy/olr/issues/14)
 
+**Test handling:** `rac-lob-log-switch` scenario cannot be used until bug is
+fixed.
+
 ---
 
 ## L11. OLR Does Not Support Invisible Columns
@@ -293,6 +305,6 @@ applies at DB creation, not pre-built).
 |----|------------|-------|---------------|
 | L8 | ROWID column (type# 69) not decoded | [#15](https://github.com/rophy/olr/issues/15) | `rowid-column` |
 | L9 | IOT not discovered in metadata | [#16](https://github.com/rophy/olr/issues/16) | `iot-table` |
-| ~~L10~~ | ~~RAC LOB + log switch null pointer crash~~ **(FIXED)** | [#14](https://github.com/rophy/olr/issues/14) | — |
+| L10 | RAC LOB + log switch null pointer crash | [#14](https://github.com/rophy/olr/issues/14) | `rac-lob-log-switch` |
 | L11 | Invisible columns not tracked | — | — |
 | L12 | US7ASCII charset corruption | [#2](https://github.com/rophy/olr/issues/2) | `multibyte-passthrough` (@TAG) |

tests/sql/TEST-COVERAGE.md

@@ -91,7 +91,7 @@ All limitations reference entries in [`KNOWN-LIMITATIONS.md`](KNOWN-LIMITATIONS.
 | US7ASCII charset | OLR charset bug ([#2](https://github.com/rophy/olr/issues/2)) | L12 |
 | Invisible columns | No property flag in SysCol | L11 |
 | IOT | OLR doesn't discover IOTs in metadata | L9 |
-| ~~RAC LOB + log switch~~ | ~~OLR crash~~ **(FIXED)** ([#14](https://github.com/rophy/olr/issues/14)) | ~~L10~~ |
+| RAC LOB + log switch | OLR crash ([#14](https://github.com/rophy/olr/issues/14)) | L10 |
 
 > **Note:** DDL scenarios (`@DDL` marker) are validated in redo-log regression tests (LogMiner comparison)
 > but **not** in Debezium twin-test. The Debezium OLR adapter does not support mid-stream