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pack_row() and unpack_row() both used record_buffer. After unpack_row(), blob field pointers in record[0] reference data stored in record_buffer. When pack_row() then writes the new packed row into the same record_buffer, it overwrites the blob data that those pointers still reference. Subsequent Field_blob::pack() calls follow the stale pointers and read corrupted data. This only matters in the optimize/repair loop where the same handler reads then writes each row. Normal INSERT has no prior unpack_row() on the same handler. Fix: in the optimize loop, before writing, copy blob data out of record_buffer (the same approach already used by get_row_version2),so that blob pointers no longer reference record_buffer when pack_row() overwrites it. Free the temporary blob buffer after the loop.
13 lines
284 B
Plaintext
13 lines
284 B
Plaintext
CREATE TABLE t1(
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t TEXT NULL DEFAULT NULL
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) COLLATE='utf8_general_ci' ENGINE=archive;
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INSERT INTO t1(t) VALUES ('Testtext');
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REPAIR TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 repair status OK
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SELECT t = 'Testtext' as Expect_1 from t1;
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Expect_1
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1
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DROP TABLE t1;
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# End of 10.6 tests
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