MDEV-25580: rpl.rpl_semi_sync_slave_compressed_protocol crashes because of wrong packet

Problem: ======== When both semi-sync and slave compression are enabled, the numbering on packet headers can become out of sync between the primary and replica servers. More specifically, after the master flushes its write, it should increment the counters that track packets. The bug is such that the master only updates the normal packet counter and leaves the compressed packet counter alone. Solution: ======== After the master flushes, additionally increment the compressed packet counter. Reviewed By: ============ Andrei Elkin: <andrei.elkin@mariadb.com>

Author: bnestere

sql/semisync_master.cc

@@ -1229,6 +1229,7 @@ int Repl_semi_sync_master::flush_net(THD *thd,
 
  net_clear(net, 0);
  net->pkt_nr++;
+ net->compress_pkt_nr++;
  result = 0;
  rpl_semi_sync_master_net_wait_num++;