Current semi-sync slave plugin implementation assumes that MariaDB has only one master and only one slave IO thread. As an example it has global variables semi_sync_need_reply and rpl_semi_sync_slave_status which should be per-master. Also I'd think object repl_semisync_slave should be per-master too.
As general MariaDB design is done for multi-master replication, semi-sync slave plugin should be adjusted for that too.
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MDEV-3793
Multi-source: Semisync replication is not fully supported for multiple masters and can cause replication failure and relay log corruption
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Closed
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This shortcoming is documented here https://kb.askmonty.org/en/multi-source-replication/#todo as a limitation of the current implementation, and is waiting to be fixed as
MDEV-3793.