Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Duplicate
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10.5.24
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None
Description
mariabackup based on MariaDB server 10.5.24-MariaDB cant create backup:
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Show all |
mariabackup based on MariaDB server 10.5.24-MariaDB debian-linux-gnu (x86_64)
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[00] 2024-02-19 11:55:43 cd to /backup/mysql/
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[00] 2024-02-19 11:55:43 open files limit requested 0, set to 1048576
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[00] 2024-02-19 11:55:43 This target seems to be already prepared.
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[00] 2024-02-19 11:55:43 mariabackup: using the following InnoDB configuration for recovery:
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[00] 2024-02-19 11:55:43 innodb_data_home_dir = .
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[00] 2024-02-19 11:55:43 innodb_data_file_path = ibdata1:1000M:autoextend
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[00] 2024-02-19 11:55:43 innodb_log_group_home_dir = .
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[00] 2024-02-19 11:55:43 InnoDB: Using Linux native AIO
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[00] 2024-02-19 11:55:43 Starting InnoDB instance for recovery.
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[00] 2024-02-19 11:55:43 mariabackup: Using 2147483648 bytes for buffer pool (set by --use-memory parameter)
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2024-02-19 11:55:43 0 [Note] InnoDB: Uses event mutexes
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2024-02-19 11:55:43 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
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2024-02-19 11:55:43 0 [Note] InnoDB: Number of pools: 1
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2024-02-19 11:55:43 0 [Note] InnoDB: Using crc32 + pclmulqdq instructions
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2024-02-19 11:55:43 0 [Note] InnoDB: Using Linux native AIO
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2024-02-19 11:55:43 0 [Note] InnoDB: Initializing buffer pool, total size = 2147483648, chunk size = 2147483648
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2024-02-19 11:55:43 0 [Note] InnoDB: Completed initialization of buffer pool
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[00] 2024-02-19 11:55:43 Last binlog file , position 0
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace
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2024-02-19 11:55:43 0 [ERROR] [FATAL] InnoDB: Unable to read page [page id: space=0, page number=5] into the buffer pool after 100. The most probable cause of this error may be that the table has been corrupted. See https://mariadb.com/kb/en/library/innodb-recovery-modes/
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240219 11:55:43 [ERROR] mysqld got signal 6 ;
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Sorry, we probably made a mistake, and this is a bug.
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Your assistance in bug reporting will enable us to fix this for the next release.
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To report this bug, see https://mariadb.com/kb/en/reporting-bugs
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We will try our best to scrape up some info that will hopefully help
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diagnose the problem, but since we have already crashed,
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something is definitely wrong and this may fail.
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Server version: 10.5.24-MariaDB-1:10.5.24+maria~ubu2004 source revision: 01f6abd1d4a929ee308f5b9287ac797a2e40d2b0
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key_buffer_size=0
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read_buffer_size=131072
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max_used_connections=0
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max_threads=1
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thread_count=0
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It is possible that mysqld could use up to
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key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 6068 K bytes of memory
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Hope that's ok; if not, decrease some variables in the equation.
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Thread pointer: 0x0
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Attempting backtrace. You can use the following information to find out
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where mysqld died. If you see no messages after this, something went
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terribly wrong...
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stack_bottom = 0x0 thread_stack 0x49000
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Printing to addr2line failed
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mariabackup(my_print_stacktrace+0x32)[0x565305946a02]
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mariabackup(handle_fatal_signal+0x475)[0x5653053f74d5]
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/lib/x86_64-linux-gnu/libpthread.so.0(+0x14420)[0x7f77081dd420]
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/lib/x86_64-linux-gnu/libc.so.6(gsignal+0xcb)[0x7f7707cd400b]
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/lib/x86_64-linux-gnu/libc.so.6(abort+0x12b)[0x7f7707cb3859]
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mariabackup(+0x674ad7)[0x565304fffad7]
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mariabackup(+0x635aac)[0x565304fc0aac]
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mariabackup(+0xd059da)[0x5653056909da]
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mariabackup(+0xeb7819)[0x565305842819]
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mariabackup(_Z20xb_write_galera_infob+0x82)[0x565305064cd2]
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mariabackup(+0x6cf88b)[0x56530505a88b]
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mariabackup(main+0x182)[0x565305012772]
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/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0x7f7707cb5083]
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mariabackup(_start+0x2e)[0x565305045e8e]
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The manual page at https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mariadbd/ contains
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information that should help you find out what is causing the crash.
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Writing a core file...
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Working directory at /backup/mysql
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Resource Limits:
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Limit Soft Limit Hard Limit Units
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Max cpu time unlimited unlimited seconds
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Max file size unlimited unlimited bytes
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Max data size unlimited unlimited bytes
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Max stack size 8388608 unlimited bytes
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Max core file size 0 unlimited bytes
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Max resident set unlimited unlimited bytes
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Max processes unlimited unlimited processes
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Max open files 1048576 1048576 files
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Max locked memory 8388608 8388608 bytes
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Max address space unlimited unlimited bytes
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Max file locks unlimited unlimited locks
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Max pending signals 128551 128551 signals
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Max msgqueue size 819200 819200 bytes
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Max nice priority 0 0
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Max realtime priority 0 0
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Max realtime timeout unlimited unlimited us
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Core pattern: core
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Attachments
Issue Links
- relates to
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MDEV-19534 Make innodb_checksum_algorithm=full_crc32 by default, and remove innodb_checksums
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- Closed
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Activity
Hello Ruslan,
We think you are hitting MDEV-33023 which is fixed in 10.5.25. That is the backed up data is fine and it is an issue with mariabackup throwing spurious error and crashing when --prepare is called more than once on the data directory.
Can you please confirm that the issue gets resolved if you upgrade to 10.5 ?
Thanks,
debarun
I checked the mariabackup code and tried to repeat the scenario in latest 10.5.25+ with combinations of checksum methods. It didn't repeat and the error scenarios were all as expected. Also, mariabackup uses the same code for checksum validation within innodb and also shares the innodb configurations used for specifying checksum i.e. innodb-checksum-algorithm.
mariabackup based on MariaDB server 10.5.24-MariaDB debian-linux-gnu (x86_64)I went back to 10.5.24 and the scenario repeated quite easily. Turns out the issue is not related to checksum and is an old issue related to doing mariabackup --prepare multiple times.
[00] 2024-02-19 11:55:43 This target seems to be already prepared.Following simple steps repeat it in 10.5.24
mariabackup --backup --target-dir=./maria_backup // BACKUP: Successfulmariabackup --prepare --target-dir=./maria_backup // First Prepare: Successfulmariabackup --prepare --target-dir=./maria_backup // Second Prepare: Failsdebanerj@deb-7010:/home/hdd/deb/maria-src5/bld_install$ /home/hdd/deb/maria-src5/bld_rel/extra/mariabackup/mariabackup --prepare --target-dir=./maria_backup/home/hdd/deb/maria-src5/bld_rel/extra/mariabackup/mariabackup based on MariaDB server 10.5.24-MariaDB Linux (x86_64)[00] 2024-05-27 16:20:55 cd to /home/hdd/deb/maria-src5/bld_install/maria_backup/[00] 2024-05-27 16:20:55 open files limit requested 0, set to 1024[00] 2024-05-27 16:20:55 This target seems to be already prepared.[00] 2024-05-27 16:20:55 mariabackup: using the following InnoDB configuration for recovery:[00] 2024-05-27 16:20:55 innodb_data_home_dir = .[00] 2024-05-27 16:20:55 innodb_data_file_path = ibdata1:12M:autoextend[00] 2024-05-27 16:20:55 innodb_log_group_home_dir = .[00] 2024-05-27 16:20:55 InnoDB: Using Linux native AIO[00] 2024-05-27 16:20:55 Starting InnoDB instance for recovery.[00] 2024-05-27 16:20:55 mariabackup: Using 104857600 bytes for buffer pool (set by --use-memory parameter)2024-05-27 16:20:55 0 [Note] InnoDB: Uses event mutexes2024-05-27 16:20:55 0 [Note] InnoDB: Compressed tables use zlib 1.2.112024-05-27 16:20:55 0 [Note] InnoDB: Number of pools: 12024-05-27 16:20:55 0 [Note] InnoDB: Using crc32 + pclmulqdq instructions2024-05-27 16:20:55 0 [Note] InnoDB: Using Linux native AIO2024-05-27 16:20:55 0 [Note] InnoDB: Initializing buffer pool, total size = 104857600, chunk size = 1048576002024-05-27 16:20:55 0 [Note] InnoDB: Completed initialization of buffer pool[00] 2024-05-27 16:20:55 Last binlog file , position 02024-05-27 16:20:55 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace2024-05-27 16:20:55 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace2024-05-27 16:20:55 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace2024-05-27 16:20:55 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace2024-05-27 16:20:55 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace...2024-05-27 16:20:55 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace2024-05-27 16:20:55 0 [Note] InnoDB: trying to read page [page id: space=0, page number=5] in nonexisting or being-dropped tablespace2024-05-27 16:20:55 0 [ERROR] [FATAL] InnoDB: Unable to read page [page id: space=0, page number=5] into the buffer pool after 100. The most probable cause of this error may be that the table has been corrupted. See https://mariadb.com/kb/en/library/innodb-recovery-modes/240527 16:20:55 [ERROR] mysqld got signal 6 ;Sorry, we probably made a mistake, and this is a bug.The issue here is that during second prepare call some paths are skipped and we don't open system tablespaces which eventually causes the failure. This is a already known issue and fixed by
MDEV-33023.The error messages and assert are misleading and there is actually no issue with the backup directory. The backup is already prepared and ignoring the error in "2nd prepare" we could continue with nest step to used the backup.
mariabackup --copy-back --target-dir=To get rid of this annoying error message and crash, please upgrade to 10.5.25 where the issue is fixed.