mariabackup --backup hangs

The output of mariabackup looks than like

 [rr 1184693 8399][00] 2024-03-13 06:19:02 Acquiring BACKUP LOCKS...

 [rr 1184693 18924]2024-03-13  6:19:10 0 [Note] InnoDB: Read redo log up to LSN=10555392

...

[rr 1184693 242736]2024-03-13  6:22:10 0 [Note] InnoDB: Read redo log up to LSN=10555392

RQG

===

# git clone https://github.com/mleich1/rqg --branch <pick the right branch> RQG

#

# GIT_SHOW: HEAD -> master 26bcf9cae09ec7d53ae8d2c378235f349fb1accd 2023-12-01T16:27:59+01:00

# rqg.pl  : Version 4.5.0 (2023-12)

#

# $RQG_HOME/rqg.pl \

# --grammar=conf/mariadb/partitions_innodb.yy \

# --gendata-advanced \

# --skip-gendata \

# --mysqld=--loose-innodb_lock_schedule_algorithm=fcfs \

# --mysqld=--loose-idle_write_transaction_timeout=0 \

# --mysqld=--loose-idle_transaction_timeout=0 \

# --mysqld=--loose-idle_readonly_transaction_timeout=0 \

# --mysqld=--connect_timeout=60 \

# --mysqld=--interactive_timeout=28800 \

# --mysqld=--slave_net_timeout=60 \

# --mysqld=--net_read_timeout=30 \

# --mysqld=--net_write_timeout=60 \

# --mysqld=--loose-table_lock_wait_timeout=50 \

# --mysqld=--wait_timeout=28800 \

# --no_mask \

# --queries=10000000 \

# --seed=random \

# --reporters=None \

# --reporters=ErrorLog \

# --reporters=Deadlock \

# --validators=None \

# --mysqld=--log_output=none \

# --mysqld=--log_bin_trust_function_creators=1 \

# --mysqld=--loose-debug_assert_on_not_freed_memory=0 \

# --engine=InnoDB \

# --restart_timeout=360 \

# --mysqld=--plugin-load-add=file_key_management.so \

# --mysqld=--loose-file-key-management-filename=$RQG_HOME/conf/mariadb/encryption_keys.txt \

# --mysqld=--plugin-load-add=provider_lzo.so \

# --mysqld=--plugin-load-add=provider_bzip2.so \

# --mysqld=--plugin-load-add=provider_lzma.so \

# --mysqld=--plugin-load-add=provider_snappy.so \

# --mysqld=--plugin-load-add=provider_lz4.so \

# --mysqld=--loose-innodb_compression_level=1 \

# --duration=300 \

# --mysqld=--loose-innodb_fatal_semaphore_wait_threshold=300 \

# --mysqld=--lock-wait-timeout=86400 \

# --mysqld=--innodb-lock-wait-timeout=50 \

# --mysqld=--innodb-lock-wait-timeout=50 \

# --mysqld=--loose-innodb_fast_shutdown=1 \

# --mysqld=--sql_mode=traditional \

# --mysqld=--loose-innodb_read_only_compressed=OFF \

# --reporters=Mariabackup_linux \

# --duration=300 \

# --mysqld=--loose-innodb-log-file-size=200M \

# --mysqld=--loose-innodb-sync-debug \

# --mysqld=--innodb_stats_persistent=off \

# --mysqld=--innodb_adaptive_hash_index=off \

# --mysqld=--innodb_sort_buffer_size=65536 \

# --mysqld=--innodb_random_read_ahead=OFF \

# --mysqld=--loose-innodb_evict_tables_on_commit_debug=on \

# --mysqld=--loose-max-statement-time=30 \

# --threads=33 \

# --mysqld=--innodb-use-native-aio=0 \

# --mysqld=--loose-gdb \

# --mysqld=--loose-debug-gdb \

# --rr=Extended \

# --rr_options=--wait \

# --mysqld=--innodb_undo_log_truncate=OFF \

# --mysqld=--loose_innodb_change_buffering=all \

# --mysqld=--innodb_undo_tablespaces=3 \

# --mysqld=--innodb_rollback_on_timeout=OFF \

# --mysqld=--innodb_page_size=64K \

# --mysqld=--innodb-buffer-pool-size=24M \

# --vardir_type=slow \

# --no_mask \

# <local settings>