Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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10.2.16
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None
Description
I have a my.cnf like so:
[mysqld]
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skip-slave-start
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bind-address=0.0.0.0
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datadir=/home/ubuntu/data-mariadb-10.2
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plugin-dir=/home/ubuntu/mariadb-10.2/storage/rocksdb
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plugin-load=ha_rocksdb.so
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log-error
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lc_messages_dir=/home/ubuntu/mariadb-10.2/sql/share
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default-storage-engine=rocksdb
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default-tmp-storage-engine=MyISAM
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log-bin=pslp
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binlog-format=row
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tmpdir=/tmp
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port=3306
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socket=/tmp/mysql.sock
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gdb
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server-id=12
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I ran mariabackup --backup to create a backup:
./mariadb-10.2/extra/mariabackup/mariabackup --defaults-file=~/my-mariadb-10.2.cnf --user=root --socket=/tmp/mysql.sock --backup
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Then I run mariabackup --prepare
./mariadb-10.2/extra/mariabackup/mariabackup --defaults-file=~/my-mariadb-10.2.cnf --user=root --socket=/tmp/mysql.sock --prepare
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and it crashes:
Program received signal SIGSEGV, Segmentation fault.
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0x0000000000000000 in ?? ()
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(gdb) wher
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#0 0x0000000000000000 in ?? ()
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#1 0x00005555564fe40e in my_hash_insert (info=0x5555570ed4a0 <ignore_db_dirs_hash>, record=0x555557ba0180 "\220\001\272WUU") at /home/ubuntu/mariadb-10.2/mysys/hash.c:391
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#2 0x0000555555c7ce0f in ignore_db_dirs_append (dirname_arg=0x7ffff50a1904 "#rocksdb") at /home/ubuntu/mariadb-10.2/sql/sql_show.cc:813
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#3 0x00007ffff4bdef1d in myrocks::rocksdb_init_func (p=0x555557bd39c0) at /home/ubuntu/mariadb-10.2/storage/rocksdb/ha_rocksdb.cc:4437
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#4 0x0000555555e57b2d in ha_initialize_handlerton (plugin=0x55555799f1f8) at /home/ubuntu/mariadb-10.2/sql/handler.cc:520
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#5 0x0000555555c06b38 in plugin_initialize (tmp_root=0x7fffffffd460, plugin=0x55555799f1f8, argc=0x7fffffffd7bc, argv=0x5555579990a0, options_only=false)
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at /home/ubuntu/mariadb-10.2/sql/sql_plugin.cc:1416
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#6 0x0000555555c07765 in plugin_init (argc=0x7fffffffd7bc, argv=0x5555579990a0, flags=2) at /home/ubuntu/mariadb-10.2/sql/sql_plugin.cc:1697
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#7 0x0000555555a5d577 in encryption_plugin_init (argc=15, argv=0x5555579990a0) at /home/ubuntu/mariadb-10.2/extra/mariabackup/encryption_plugin.cc:155
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#8 0x0000555555a5d4c8 in encryption_plugin_prepare_init (argc=14, argv=0x55555799f018) at /home/ubuntu/mariadb-10.2/extra/mariabackup/encryption_plugin.cc:143
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#9 0x0000555555a408a8 in xtrabackup_prepare_func (argv=0x55555799f018) at /home/ubuntu/mariadb-10.2/extra/mariabackup/xtrabackup.cc:4976
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#10 0x0000555555a42a8d in main_low (argv=0x55555799f018) at /home/ubuntu/mariadb-10.2/extra/mariabackup/xtrabackup.cc:5793
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#11 0x0000555555a4229f in main (argc=5, argv=0x7fffffffe4f8) at /home/ubuntu/mariadb-10.2/extra/mariabackup/xtrabackup.cc:5586
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Attachments
Activity
Takeaways from discussion with wlad:
- mariabackup --prepare starts a haf-featured server in order to apply InnoDB's redo log.
- It may need to load encryption plugins
- However it does not need to load other kinds of plugins (e.g. MyRocks plugin).
- Starting MyRocks on a partially-initialized server causes a crash.
I could run mariabackup -prepare without -defaults-file and it worked:
./mariadb-10.2/extra/mariabackup/mariabackup --user=root --socket=/tmp/mysql.sock --prepare
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It crashes because ignore_db_dirs_hash is not initialized:
(gdb) p ignore_db_dirs_hash$3 = {key_offset = 0, key_length = 0, blength = 0, records = 0, flags = 0, array = {buffer = 0x0, elements = 0, max_element = 0, alloc_increment = 0, size_of_element = 0,malloc_flags = 0}, get_key = 0x0, hash_function = 0x0, free = 0x0, charset = 0x0}