Есть ужасная по своей ужасности проблема! Решил проверить как работает связка freebsd+mpd по сравнению с linux+poptop. Поднял сервер, погонял сам, начал понемногу клиентов пересаживать, 2 недели безупречной работы и вдруг MPD начал падать. Упорно и безудержно. Через несколько минут стало ясно, что он падает только от того что один из клиентов пытается к нему подключиться! Клиента закинули обратно на poptop, где он нормально заработал. Логи mpd вот такие:

Sep 22 14:19:43 vip-m mpd: pptp8: attached to connection with 10.0.5.51:3193
Sep 22 14:19:43 vip-m mpd: [pptp8] IFACE: Open event
Sep 22 14:19:43 vip-m mpd: [pptp8] IPCP: Open event
Sep 22 14:19:43 vip-m mpd: [pptp8] IPCP: state change Initial --> Starting
Sep 22 14:19:43 vip-m mpd: [pptp8] IPCP: LayerStart
Sep 22 14:19:43 vip-m mpd: [pptp8] IPCP: Open event
Sep 22 14:19:43 vip-m mpd: [pptp8] bundle: OPEN event in state CLOSED
Sep 22 14:19:43 vip-m mpd: [pptp8] opening link "pptp8"...
Sep 22 14:19:43 vip-m mpd: [pptp8] link: OPEN event
Sep 22 14:19:43 vip-m mpd: [pptp8] LCP: Open event
Sep 22 14:19:43 vip-m mpd: [pptp8] LCP: state change Initial --> Starting
Sep 22 14:19:43 vip-m mpd: [pptp8] LCP: LayerStart
Sep 22 14:19:43 vip-m mpd: [pptp8] device: OPEN event in state DOWN
Sep 22 14:19:43 vip-m mpd: [pptp8] attaching to peer's outgoing call
Sep 22 14:19:43 vip-m mpd: [pptp8] device is now in state OPENING
Sep 22 14:19:43 vip-m mpd: [pptp8] device: UP event in state OPENING
Sep 22 14:19:43 vip-m mpd: [pptp8] device is now in state UP
Sep 22 14:19:43 vip-m mpd: [pptp8] link: UP event
Sep 22 14:19:43 vip-m mpd: [pptp8] link: origination is remote
Sep 22 14:19:43 vip-m mpd: [pptp8] LCP: Up event
Sep 22 14:19:43 vip-m mpd: [pptp8] LCP: state change Starting --> Req-Sent
Sep 22 14:19:43 vip-m mpd: [pptp8] LCP: phase shift DEAD --> ESTABLISH
Sep 22 14:19:43 vip-m mpd: [pptp8] LCP: SendConfigReq #1
Sep 22 14:19:43 vip-m mpd:  ACFCOMP
Sep 22 14:19:43 vip-m mpd:  PROTOCOMP
Sep 22 14:19:43 vip-m mpd:  MRU 1500
Sep 22 14:19:43 vip-m mpd:  MAGICNUM 2d3f5282
Sep 22 14:19:43 vip-m mpd:  AUTHPROTO CHAP MD5
Sep 22 14:19:43 vip-m mpd:  MP MRRU 1600
Sep 22 14:19:43 vip-m mpd:  MP SHORTSEQ
Sep 22 14:19:43 vip-m mpd:  ENDPOINTDISC [802.1] 00 10 4b 93 65 10
Sep 22 14:19:43 vip-m mpd: pptp8-0: ignoring SetLinkInfo
Sep 22 14:19:43 vip-m mpd: [pptp8] LCP: rec'd Configure Request #0 link 0 (Req-Sent)
Sep 22 14:19:43 vip-m mpd:  MRU 1400
Sep 22 14:19:43 vip-m mpd:  MAGICNUM 53a12345
Sep 22 14:19:43 vip-m mpd:  PROTOCOMP
Sep 22 14:19:43 vip-m mpd:  ACFCOMP
Sep 22 14:19:43 vip-m mpd:  CALLBACK
Sep 22 14:19:43 vip-m mpd:    Not supported

Sep 22 14:19:43 vip-m mpd: [pptp8] LCP: SendConfigRej #0
Sep 22 14:19:43 vip-m mpd:  CALLBACK
Sep 22 14:19:43 vip-m mpd: [pptp8] LCP: rec'd Configure Request #1 link 0 (Req-Sent)
Sep 22 14:19:43 vip-m mpd:  MRU 1400
Sep 22 14:19:43 vip-m mpd:  MAGICNUM 53a12345
Sep 22 14:19:43 vip-m mpd:  PROTOCOMP
Sep 22 14:19:43 vip-m mpd:  ACFCOMP
Sep 22 14:19:43 vip-m mpd: [pptp8] LCP: SendConfigAck #1
Sep 22 14:19:43 vip-m mpd:  MRU 1400
Sep 22 14:19:43 vip-m mpd:  MAGICNUM 53a12345
Sep 22 14:19:43 vip-m mpd:  PROTOCOMP
Sep 22 14:19:43 vip-m mpd:  ACFCOMP
Sep 22 14:19:43 vip-m mpd: [pptp8] LCP: state change Req-Sent --> Ack-Sent
Sep 22 14:19:45 vip-m mpd: [pptp8] LCP: SendConfigReq #2
Sep 22 14:19:45 vip-m mpd:  ACFCOMP
Sep 22 14:19:45 vip-m mpd:  PROTOCOMP
Sep 22 14:19:45 vip-m mpd:  MRU 1500
Sep 22 14:19:45 vip-m mpd:  MAGICNUM 2d3f5282
Sep 22 14:19:45 vip-m mpd:  AUTHPROTO CHAP MD5
Sep 22 14:19:45 vip-m mpd:  MP MRRU 1600
Sep 22 14:19:45 vip-m mpd:  MP SHORTSEQ
Sep 22 14:19:45 vip-m mpd:  ENDPOINTDISC [802.1] 00 10 4b 93 65 10
Sep 22 14:19:45 vip-m mpd: [pptp8] LCP: rec'd Configure Reject #2 link 0 (Ack-Sent)
Sep 22 14:19:45 vip-m mpd:  MP MRRU 1600
Sep 22 14:19:45 vip-m mpd:  MP SHORTSEQ
Sep 22 14:19:45 vip-m mpd:  ENDPOINTDISC [802.1] 00 10 4b 93 65 10
Sep 22 14:19:45 vip-m mpd: [pptp8] LCP: SendConfigReq #3
Sep 22 14:19:45 vip-m mpd:  ACFCOMP
Sep 22 14:19:45 vip-m mpd:  PROTOCOMP
Sep 22 14:19:45 vip-m mpd:  MRU 1500
Sep 22 14:19:45 vip-m mpd:  MAGICNUM 2d3f5282
Sep 22 14:19:45 vip-m mpd:  AUTHPROTO CHAP MD5
Sep 22 14:19:45 vip-m mpd: [pptp8] LCP: rec'd Configure Ack #3 link 0 (Ack-Sent)
Sep 22 14:19:45 vip-m mpd:  ACFCOMP
Sep 22 14:19:45 vip-m mpd:  PROTOCOMP
Sep 22 14:19:45 vip-m mpd:  MRU 1500
Sep 22 14:19:45 vip-m mpd:  MAGICNUM 2d3f5282
Sep 22 14:19:45 vip-m mpd:  AUTHPROTO CHAP MD5
Sep 22 14:19:45 vip-m mpd: [pptp8] LCP: state change Ack-Sent --> Opened
Sep 22 14:19:45 vip-m mpd: [pptp8] LCP: phase shift ESTABLISH --> AUTHENTICATE
Sep 22 14:19:45 vip-m mpd: [pptp8] LCP: auth: peer wants nothing, I want CHAP
Sep 22 14:19:45 vip-m mpd: [pptp8] CHAP: sending CHALLENGE
Sep 22 14:19:45 vip-m mpd: [pptp8] LCP: LayerUp
Sep 22 14:19:45 vip-m mpd: [pptp8] LCP: rec'd Ident #2 link 0 (Opened)
Sep 22 14:19:45 vip-m mpd:  MESG: MSRASV5.10
Sep 22 14:19:45 vip-m mpd: pptp8-0: ignoring SetLinkInfo
Sep 22 14:19:45 vip-m mpd: [pptp8] LCP: rec'd Ident #3 link 0 (Opened)
Sep 22 14:19:45 vip-m mpd:  MESG: MSRAS-1-LINGVA-4OBTKQIG
Sep 22 14:19:45 vip-m mpd: [pptp8] CHAP: rec'd RESPONSE #1
Sep 22 14:19:45 vip-m mpd:  Name: ""
Sep 22 14:19:45 vip-m mpd: [pptp8] RADIUS: using /etc/radius.conf
Sep 22 14:19:45 vip-m mpd: [pptp8] RADIUS: RadiusAddServer Adding 80.91.192.55
Sep 22 14:19:45 vip-m mpd: [pptp8] RADIUS: RadiusPutAuth: RADIUS_CHAP (MD5) peer name:
Sep 22 14:20:26 vip-m mpd: [pptp8] RADIUS: RadiusSendRequest: rad_send_request failed No valid RADIUS responses r
eceived
Sep 22 14:20:26 vip-m mpd: [pptp8] CHAP: sending FAILURE
Sep 22 14:20:26 vip-m mpd: [pptp8] LCP: authorization failed
Sep 22 14:20:26 vip-m mpd: [pptp8] device: CLOSE event in state UP
Sep 22 14:20:26 vip-m mpd: pptp8-0: clearing call
Sep 22 14:20:26 vip-m mpd: pptp8-0: killing channel
Sep 22 14:20:26 vip-m mpd: [pptp8] PPTP call terminated
Sep 22 14:20:26 vip-m mpd: [pptp8] IFACE: Close event
Sep 22 14:20:26 vip-m mpd: [pptp8] IPCP: Close event
Sep 22 14:20:26 vip-m mpd: [pptp8] IPCP: state change Starting --> Initial
Sep 22 14:20:26 vip-m mpd: [pptp8] IPCP: LayerFinish
Sep 22 14:20:26 vip-m mpd: [pptp8] IFACE: Close event
Sep 22 14:20:26 vip-m mpd: pptp8: closing connection with 10.0.5.51:3193
Sep 22 14:20:26 vip-m mpd: pptp8: write: Broken pipe
Sep 22 14:20:26 vip-m mpd: pptp8: killing connection with 10.0.5.51:3193
Sep 22 14:20:26 vip-m mpd: pptp208: write: Bad file descriptor
Sep 22 14:20:26 vip-m mpd: pptp208: killing connection with 208.208.208.208:53456
Sep 22 14:20:26 vip-m mpd: [pptp8] EVENT: EventUnRegister: event not found
Sep 22 14:20:26 vip-m last message repeated 2 times
Sep 22 14:20:26 vip-m mpd: mpd: caught fatal signal bus
Sep 22 14:20:26 vip-m mpd: mpd: fatal error, exiting
Sep 22 14:20:26 vip-m mpd: [pptp0] IPCP: Down event
Sep 22 14:20:26 vip-m mpd: [pptp0] IPCP: state change Opened --> Starting
Sep 22 14:20:26 vip-m mpd: [pptp0] IPCP: LayerDown
Sep 22 14:20:26 vip-m mpd: [pptp0] IFACE: Down event
Sep 22 14:20:26 vip-m mpd: [pptp0] exec: /sbin/route delete 80.91.193.29 -iface lo0
Sep 22 14:20:26 vip-m mpd: [pptp0] exec: /sbin/ifconfig ng0 down delete -link0
Sep 22 14:20:26 vip-m mpd: [pptp0] IFACE: Close event
Sep 22 14:20:26 vip-m mpd: [pptp0] IPCP: Close event
Sep 22 14:20:26 vip-m mpd: [pptp0] IPCP: state change Starting --> Initial
Sep 22 14:20:26 vip-m mpd: [pptp0] IPCP: LayerFinish
Sep 22 14:20:26 vip-m mpd: [pptp1] IPCP: Down event
Sep 22 14:20:26 vip-m mpd: [pptp1] IPCP: state change Opened --> Starting
Sep 22 14:20:26 vip-m mpd: [pptp1] IPCP: LayerDown
Sep 22 14:20:26 vip-m mpd: [pptp1] IFACE: Down event
Sep 22 14:20:26 vip-m mpd: [pptp1] exec: /sbin/route delete 80.91.193.29 -iface lo0
Sep 22 14:20:26 vip-m mpd: [pptp1] exec: command returned 256