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A test frequently fails like this:
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10.10 63961a08a6203f4d58363a9321e4cf9c8b07a9fe
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encryption.innodb-redo-nokeys 'cbc,innodb' w2 [ fail ] Found warnings/errors in server log file!
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Test ended at 2022-06-28 18:48:49
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line
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2022-06-28 18:48:45 0 [ERROR] InnoDB: Missing FILE_CHECKPOINT(60709) at 1800619
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2022-06-28 18:48:45 0 [ERROR] InnoDB: Log scan aborted at LSN 1800619
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For the above failure on kvm-asan, data.tar.xz is a copy of the data directory. To my surprise, it recovered fine both when restored to /dev/shm (using mmap(2) based access to the log) and to some other directory (reading the log by pread(2)).
To my surprise, the recovery would start from a much later LSN:
2022-06-29 9:06:07 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=1824911
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The 2 checkpoint blocks contain the following:
001000 00 00 00 00 00 1b d8 8f 00 00 00 00 00 1d c3 81
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001010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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*
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001030 00 00 00 00 00 00 00 00 00 00 00 00 27 3f 7c 88
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001040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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*
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002000 00 00 00 00 00 00 ed 25 00 00 00 00 00 1b 79 13
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002010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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*
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002030 00 00 00 00 00 00 00 00 00 00 00 00 3f 8a 1f cd
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002040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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*
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003000
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That is, the first checkpoint is 0xed25 (60709) and the second one is 0x1bd88f (1824911). Even if I discard the second checkpoint, the recovery will succeed for me:
tar xJf data.tar.xz
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od -Ax -t x1 -j 0x1000 -N 0x2000 data/ib_logfile0
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mariadbd --innodb-log-file-size=10M --datadir $(pwd)/data/
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2022-06-29 9:13:27 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=60709
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2022-06-29 9:13:27 0 [Note] InnoDB: Starting final batch to recover 6 pages from redo log.
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2022-06-29 9:13:27 0 [Note] InnoDB: 128 rollback segments are active.
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2022-06-29 9:13:27 0 [Note] InnoDB: Setting file './ibtmp1' size to 12.000MiB. Physically writing the file full; Please wait ...
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2022-06-29 9:13:27 0 [Note] InnoDB: File './ibtmp1' size is now 12.000MiB.
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2022-06-29 9:13:27 0 [Note] InnoDB: log sequence number 1952036; transaction id 67
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At the indicated LSN 1800619 (0x1b79ab) of the failure message, I see the end of a mini-transaction that the checkpoint pointed to (0x1b7913). In the MDEV-14425 log format, the LSN conveniently is equal to the byte offset in the ib_logfile0 that was created at database initialization and did not wrap around yet. Here is the mini-transaction in question:
od -Ax -t x1 -t a -j 0x1b7913 -N 152 data/ib_logfile0
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1b7913 b0 01 05 00 2e 2f 74 65 73 74 2f 74 31 2e 69 62
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0 soh enq nul . / t e s t / t 1 . i b
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1b7923 64 b0 12 01 00 2e 2f 6d 79 73 71 6c 2f 69 6e 6e
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d 0 dc2 soh nul . / m y s q l / i n n
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1b7933 6f 64 62 5f 74 61 62 6c 65 5f 73 74 61 74 73 2e
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o d b _ t a b l e _ s t a t s .
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1b7943 69 62 64 b0 12 02 00 2e 2f 6d 79 73 71 6c 2f 69
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i b d 0 dc2 stx nul . / m y s q l / i
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1b7953 6e 6e 6f 64 62 5f 69 6e 64 65 78 5f 73 74 61 74
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n n o d b _ i n d e x _ s t a t
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1b7963 73 2e 69 62 64 b0 01 06 00 2e 2f 74 65 73 74 2f
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s . i b d 0 soh ack nul . / t e s t /
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1b7973 74 32 2e 69 62 64 b0 01 07 00 2e 2f 74 65 73 74
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t 2 . i b d 0 soh bel nul . / t e s t
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1b7983 2f 74 33 2e 69 62 64 b0 01 08 00 2e 2f 74 65 73
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/ t 3 . i b d 0 soh bs nul . / t e s
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1b7993 74 2f 74 34 2e 69 62 64 fa 00 00 00 00 00 00 00
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t / t 4 . i b d z nul nul nul nul nul nul nul
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1b79a3 00 ed 25 01 9e 41 cb 2d
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nul m % soh rs A K -
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1b79ab
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This must have been written by fil_names_clear(). We have a number of FILE_MODIFY records of files that were modified since the checkpoint (0xb0, encoded length, encoded tablespace ID, 0, file name), and a FILE_CHECKPOINT record (0xfa, 0, 0, big-endian 64-bit LSN=0xed25), and the end-of-mini-transaction marker (sequence bit=1) and the CRC-32C checksum 0x9e41cb2d. Everything looks perfectly fine.
Most failures occur on FreeBSD, but the above is the first case where a copy of the data directory is available yet. Here are two failures for 10.5:
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10.5 35f2cdcb99f4f8b39895070fde3f825329106361
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encryption.innodb-redo-nokeys 'cbc,innodb' w3 [ fail ] Found warnings/errors in server log file!
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Test ended at 2022-06-23 04:51:11
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line
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2022-06-23 4:51:08 0 [ERROR] InnoDB: Missing FILE_CHECKPOINT at 1381251 between the checkpoint 52621 and the end 1446400.
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^ Found warnings in /tmp/var/3/log/mysqld.1.err
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…
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encryption.innodb-redo-nokeys 'ctr,innodb' w4 [ fail ] Found warnings/errors in server log file!
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Test ended at 2022-06-23 04:53:50
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line
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2022-06-23 4:53:47 0 [ERROR] InnoDB: Missing FILE_CHECKPOINT at 1171764 between the checkpoint 52621 and the end 1236992.
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^ Found warnings in /tmp/var/4/log/mysqld.1.err
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In each case, it seems possible that the latest checkpoint was from the shutdown of the server bootstrap.
serg, to me, this looks like a race condition in mtr. I suspect that the new server process was started while the old one is still being killed by the test (while writing a checkpoint). Before MDEV-24393, such a race would have been prevented by advisory locks on the files. If it is the case, fixing MDEV-28662 should fix this bug.
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data.tar.xz