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Outgoing mail is not working when SMTP inspection is enabled for Anti-Spam, and disabled for DLP Technical Level
Symptoms
  • Outgoing mail is not working when SMTP inspection is enabled for Anti-Spam, and disabled for DLP.

  • Running emaild debug (fw_debug in.emaild.smtp on), in.emaild.smtp has lock_producers_hash twice without unlocking, for example:
    lock_producers_hash: kiss_stat_server.c:1318
    kiss_stat_server_connection_handler: Producer dlp doesn't exist
    fwasync_do_mux_in: 23: rc=-1, next: 2a9cf0 with 1, req: 0r, 0w
    fwasync_do_mux_in: 23: handler returned with error
    fwasync_end_conn: scheduling the end of connection 23
    T_event_do_del: marking for deletion socket/type: 23/0
    T_event_do_del: marking for deletion socket/type: 23/1
    T_event_do_del: marking for deletion socket/type: 23/2
    fwasync_do_end_conn: closing connection 23 (conn=af1a528)
    kiss_stat_server_end_handler: connection 23, state 1
    fwasync_do_end_conn: 23: calling 0x2a9880 to free opaque 0xac1bf60
    lock_producers_hash: kiss_stat_server.c:1072.

  • No packet drops can be found when running kernel debud with:
    #fw ctl zdebug + drop | grep ":25"

  • Telnet to port 25 is stuck, for example: working telnet
    server@admin:~$ telnet 192.168.152.202 25
    Trying 192.168.152.202...
    Connected to 192.168.152.202.
    Escape character is '^]'.


    For non-working telnet
    server@admin:~$ telnet 192.168.152.202 25
    Trying 192.168.152.202....

Cause

The issue happens due to unreleased "lock-in" in.emaild.smtp process.


Solution
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