Re: PostgreSQL client hangs sometimes on 'EXEC SQL PREPARE sid_sisisinst FROM :select_anw;'

[Matthias Apitz]

I've added the proposed log line to the server code in 
src/backend/libpq/pqcomm.c
and restarted the server with this. In the log file 
/data/postgresql11/data/serverlog
are other messages about length of packages, like:

2020-04-28 09:49:49.877 CEST [16229] LOG:  invalid length of startup packet
2020-04-28 09:49:50.117 CEST [16231] LOG:  invalid length of startup packet

They're coming from:

grep 'invalid length of startup packet' src/backend/*/*.c
src/backend/postmaster/postmaster.c:                             
errmsg("invalid length of startup packet")));

I will change the code there to to get the 'len' printed with the
message

...
        if (len < (int32) sizeof(ProtocolVersion) ||
                len > MAX_STARTUP_PACKET_LENGTH)
        {
                ereport(COMMERROR,
                                (errcode(ERRCODE_PROTOCOL_VIOLATION),
                                 errmsg("invalid length %d of startup packet", 
len)));
                return STATUS_ERROR;
        }

-- 
Matthias Apitz, ✉ g...@unixarea.de, http://www.unixarea.de/ +49-176-38902045
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