This seems to be happening only when using the pop3c plugin. Any advice?

root@imap01:/etc/dovecot# doveadm -D -o imapc_user=chat_logs@xxxxxx.com -o 'imapc_password=*******' -o pop3c_user=chat_logs@xxxxxx.com -o 'pop3c_password=*****' backup -u chat_logs@xxxxxx.com -R imapc: doveadm(root): Debug: Loading modules from directory: /usr/lib/dovecot/modules doveadm(root): Debug: Module loaded: /usr/lib/dovecot/modules/lib10_quota_plugin.so doveadm(root): Debug: Module loaded: /usr/lib/dovecot/modules/lib20_expire_plugin.so doveadm(root): Debug: Module loaded: /usr/lib/dovecot/modules/lib20_listescape_plugin.so doveadm(root): Debug: Loading modules from directory: /usr/lib/dovecot/modules/doveadm doveadm(root): Debug: Skipping module doveadm_acl_plugin, because dlopen() failed: /usr/lib/dovecot/modules/doveadm/lib10_doveadm_acl_plugin.so: undefined symbol: acl_user_module (this is usually intentional, so just ignore this message) doveadm(root): Debug: Module loaded: /usr/lib/dovecot/modules/doveadm/lib10_doveadm_expire_plugin.so doveadm(root): Debug: Module loaded: /usr/lib/dovecot/modules/doveadm/lib10_doveadm_quota_plugin.so doveadm(root): Debug: Skipping module doveadm_zlib_plugin, because dlopen() failed: /usr/lib/dovecot/modules/doveadm/lib10_doveadm_zlib_plugin.so: undefined symbol: i_stream_create_deflate (this is usually intentional, so just ignore this message) doveadm(root): Debug: Skipping module doveadm_fts_plugin, because dlopen() failed: /usr/lib/dovecot/modules/doveadm/lib20_doveadm_fts_plugin.so: undefined symbol: fts_list_backend (this is usually intentional, so just ignore this message) doveadm(chat_logs@xxxxxx.com): Debug: Added userdb setting: mail=maildir:/stor/real/domains/xxxxxx.com/ch/chat_logs/Maildir doveadm(chat_logs@xxxxxx.com): Debug: Added userdb setting: plugin/quota_rule=*:storage=5120M doveadm(chat_logs@xxxxxx.com): Debug: Effective uid=1001, gid=1001, home=/stor/real/domains/xxxxxx.com/ch/chat_logs doveadm(chat_logs@xxxxxx.com): Debug: Home dir not found: /stor/real/domains/xxxxxx.com/ch/chat_logs doveadm(chat_logs@xxxxxx.com): Debug: Namespace : type=private, prefix=POP3-MIGRATION-NS/, sep=, inbox=no, hidden=yes, list=no, subscriptions=yes location=pop3c: doveadm(chat_logs@xxxxxx.com): Debug: fs: root=, index=, control=, inbox=, alt= doveadm(chat_logs@xxxxxx.com): Debug: Namespace inbox: type=private, prefix=, sep=/, inbox=yes, hidden=no, list=yes, subscriptions=yes location=maildir:/stor/real/domains/xxxxxx.com/ch/chat_logs/Maildir doveadm(chat_logs@xxxxxx.com): Debug: maildir++: root=/stor/real/domains/xxxxxx.com/ch/chat_logs/Maildir, index=, control=, inbox=/stor/real/domains/xxxxxx.com/ch/chat_logs/Maildir, alt= doveadm(chat_logs@xxxxxx.com): Debug: Namespace : /stor/real/domains/xxxxxx.com/ch/chat_logs/Maildir doesn't exist yet, using default permissions doveadm(chat_logs@xxxxxx.com): Debug: Namespace : Using permissions from /stor/real/domains/xxxxxx.com/ch/chat_logs/Maildir: mode=0700 gid=-1 dsync(chat_logs@xxxxxx.com): Debug: Effective uid=1001, gid=1001, home=/stor/real/domains/xxxxxx.com/ch/chat_logs dsync(chat_logs@xxxxxx.com): Debug: Namespace : type=private, prefix=POP3-MIGRATION-NS/, sep=, inbox=no, hidden=yes, list=no, subscriptions=yes location=pop3c: dsync(chat_logs@xxxxxx.com): Debug: fs: root=, index=, control=, inbox=, alt= dsync(chat_logs@xxxxxx.com): Debug: Namespace inbox: type=private, prefix=, sep=/, inbox=yes, hidden=no, list=yes, subscriptions=yes location=imapc: dsync(chat_logs@xxxxxx.com): Debug: imapc: root=, index=, control=, inbox=, alt= dsync(chat_logs@xxxxxx.com): Debug: imapc(mail01.xxxxxx.com:143): Looking up IP address dsync(chat_logs@xxxxxx.com): Debug: imapc(mail01.xxxxxx.com:143): Connecting to 111.111.111.111:143 dsync(chat_logs@xxxxxx.com): Debug: imapc(mail01.xxxxxx.com:143): Server capabilities: IMAP4rev1 NAMESPACE LITERAL+ UIDPLUS IDLE COMPARATOR AUTH=LOGIN AUTH=NTLM AUTH=SCRAM-MD5 AUTH=CRAM-MD5 dsync(chat_logs@xxxxxx.com): Debug: imapc(mail01.xxxxxx.com:143): Authenticating as chat_logs@xxxxxx.com dsync(chat_logs@xxxxxx.com): Debug: imapc(mail01.xxxxxx.com:143): Authenticated successfully dsync(chat_logs@xxxxxx.com): Debug: Namespace : /stor/real/domains/xxxxxx.com/ch/chat_logs/Maildir/.Sent Items doesn't exist yet, using default permissions dsync(chat_logs@xxxxxx.com): Debug: Namespace : Using permissions from /stor/real/domains/xxxxxx.com/ch/chat_logs/Maildir: mode=0700 gid=-1 dsync(chat_logs@xxxxxx.com): Info: Sent Items: only in source (guid=34b8141947b9372e94589bd35a54dac5) dsync(chat_logs@xxxxxx.com): Info: INBOX: only in source (guid=c92f64f79f0d1ed01e6d5b314f04886c) dsync(chat_logs@xxxxxx.com): Debug: imapc(mail01.xxxxxx.com:143): Looking up IP address dsync(chat_logs@xxxxxx.com): Debug: imapc(mail01.xxxxxx.com:143): Connecting to 111.111.111.111:143 dsync(chat_logs@xxxxxx.com): Debug: imapc(mail01.xxxxxx.com:143): Server capabilities: IMAP4rev1 NAMESPACE LITERAL+ UIDPLUS IDLE COMPARATOR AUTH=LOGIN AUTH=NTLM AUTH=SCRAM-MD5 AUTH=CRAM-MD5 dsync(chat_logs@xxxxxx.com): Debug: imapc(mail01.xxxxxx.com:143): Authenticating as chat_logs@xxxxxx.com dsync(chat_logs@xxxxxx.com): Debug: imapc(mail01.xxxxxx.com:143): Authenticated successfully dsync(chat_logs@xxxxxx.com): Debug: pop3c(111.111.111.111): Looking up IP address dsync(chat_logs@xxxxxx.com): Debug: pop3c(111.111.111.111): Connecting to 111.111.111.111:110 dsync(chat_logs@xxxxxx.com): Debug: pop3c(111.111.111.111): Authenticating as chat_logs@xxxxxx.com dsync(chat_logs@xxxxxx.com): Warning: I/O leak: 0xb769a340 (line 1229, fd 14) dsync(chat_logs@xxxxxx.com): Warning: I/O leak: 0xb769a340 (line 1229, fd 10) dsync(chat_logs@xxxxxx.com): Warning: Timeout leak: 0xb769a5a0 (line 1316) dsync(chat_logs@xxxxxx.com): Warning: Timeout leak: 0xb769a5a0 (line 1316)