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Undo log truncation is still buggy, even after MDEV-26450 was fixed.
while ./mtr --rr=-h --parallel=auto --mysqld=--innodb-purge-threads=1 innodb.undo_truncate_recover,4k,strict_full_crc32{,,,,,,,,,,}; do :; done
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10.6 67f4ba240e5fa5f95ab4f1688bdb18f61e7d4d7f
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innodb.undo_truncate_recover '2,4k,innodb,strict_full_crc32' w4 [ fail ] Found warnings/errors in server log file!
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Test ended at 2022-11-11 09:51:35
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line
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2022-11-11 9:51:34 0 [ERROR] InnoDB: OPT_PAGE_CHECKSUM mismatch on [page id: space=2, page number=74]
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2022-11-11 9:51:34 0 [ERROR] InnoDB: Set innodb_force_recovery=1 to ignore corruption.
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2022-11-11 9:51:34 0 [ERROR] InnoDB: Unable to apply log to corrupted page [page id: space=2, page number=74]; set innodb_force_recovery to ignore
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2022-11-11 9:51:34 0 [ERROR] InnoDB: Plugin initialization aborted at srv0start.cc[1505] with error Data structure corruption
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2022-11-11 9:51:34 0 [ERROR] InnoDB: Failed to read page 74 from file './/undo002': Page read from tablespace is corrupted.
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2022-11-11 9:51:34 0 [ERROR] Plugin 'InnoDB' init function returned error.
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2022-11-11 9:51:34 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
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Crash recovery will read an older version of the page. The checkpoint LSN was equal to the commit LSN of mtr.commit_shrink(space) in trx_purge_truncate_history(). So, the error is only on the recovery side.
Recovery invoked recv_sys_t::trim() on page 640, but in fact all pages in the undo log tablespace will be reinitialized, and hence all redo log records for the tablespace before the truncation LSN need to be discarded.
This failure has also occurred on our CI systems a couple of times:
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10.10 d371e35257c45895318c4efbed20e5bfdcc7cee9
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innodb.undo_truncate_recover '2,4k,innodb,strict_full_crc32' w4 [ fail ] Found warnings/errors in server log file!
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Test ended at 2022-06-18 12:14:25
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line
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2022-06-18 12:14:25 0 [ERROR] InnoDB: OPT_PAGE_CHECKSUM mismatch on [page id: space=2, page number=74]
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2022-06-18 12:14:25 0 [ERROR] InnoDB: Set innodb_force_recovery=1 to ignore corruption.
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2022-06-18 12:14:25 0 [ERROR] InnoDB: Plugin initialization aborted at srv0start.cc[1243] with error Data structure corruption
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2022-06-18 12:14:25 0 [ERROR] InnoDB: Failed to read page 74 from file './/undo002': Page read from tablespace is corrupted.
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2022-06-18 12:14:25 0 [ERROR] Plugin 'InnoDB' init function returned error.
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2022-06-18 12:14:25 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
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^ Found warnings in /buildbot/amd64-ubuntu-2004-msan/build/mysql-test/var/4/log/mysqld.1.err
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ok
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- saving '/buildbot/amd64-ubuntu-2004-msan/build/mysql-test/var/4/log/innodb.undo_truncate_recover-2,4k,innodb,strict_full_crc32/' to '/buildbot/amd64-ubuntu-2004-msan/build/mysql-test/var/log/innodb.undo_truncate_recover-2,4k,innodb,strict_full_crc32/'
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We can thank MDEV-18976 and https://rr-project.org for finding this bug. Before it, the failure looked like this:
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10.6 660cfe4782380bbb10ab844014b82f4d5c2fee50
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innodb.undo_truncate_recover '2,4k,innodb,strict_crc32' w2 [ fail ]
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Test ended at 2021-12-12 18:54:02
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CURRENT_TEST: innodb.undo_truncate_recover
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Server [mysqld.1 - pid: 191888, winpid: 191888, exit: 256] failed during test run
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Server log from this test:
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----------SERVER LOG START-----------
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$ /buildbot/amd64-ubuntu-1804-msan/build/sql/mariadbd --defaults-group-suffix=.1 --defaults-file=/buildbot/amd64-ubuntu-1804-msan/build/mysql-test/var/2/my.cnf --log-output=file --innodb --innodb-cmpmem --innodb-cmp-per-index --innodb-trx --innodb-locks --innodb-lock-waits --innodb-metrics --innodb-buffer-pool-stats --innodb-buffer-page --innodb-buffer-page-lru --innodb-sys-columns --innodb-sys-fields --innodb-sys-foreign --innodb-sys-foreign-cols --innodb-sys-indexes --innodb-sys-tables --innodb-sys-virtual --innodb-page-size=4K --skip-innodb-read-only-compressed --innodb-checksum-algorithm=strict_crc32 --innodb-undo-tablespaces=2 --innodb-purge-threads=1 --core-file --loose-debug-sync-timeout=300
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2021-12-12 18:53:30 0 [Note] /buildbot/amd64-ubuntu-1804-msan/build/sql/mariadbd (server 10.6.6-MariaDB-debug-log) starting as process 190177 ...
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…
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2021-12-12 18:54:01 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=20546035,20621018
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2021-12-12 18:54:01 0 [Note] InnoDB: Opened 2 undo tablespaces
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2021-12-12 18:54:01 0 [Warning] InnoDB: innodb_undo_tablespaces=0 disables dedicated undo log tablespaces
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2021-12-12 18:54:01 0 [Note] InnoDB: Starting final batch to recover 1816 pages from redo log.
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mariadbd: /buildbot/amd64-ubuntu-1804-msan/build/storage/innobase/log/log0recv.cc:275: log_phys_t::apply_status log_phys_t::apply(const buf_block_t &, uint16_t &) const: Assertion `mach_read_from_4(frame + 4U) == block.page.id().page_no()' failed.
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utr4k.tar.xz