Hi, developers, thank you for your checking. Does it seem the lock ctrl_mutex is not released correctly when writing to the destination stream fails and writing to the destination stream fails in the compress_write?

This is similar to the lock data_mutex, which is acquired in a nearby place. It is not released when writing to the destination stream fails and writing to the destination stream fails in the compress_write.

https://github.com/MariaDB/server/blob/10.9/extra/mariabackup/ds_compress.cc#L234-L261

Thank you for your checking!