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Re: Exceeded maximum lock level

From: alexander lunyov <lan(at)zato(dot)ru>
To: pgsql-interfaces(at)postgresql(dot)org
Cc: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
Subject: Re: Exceeded maximum lock level
Date: 2008-04-24 05:34:19
Message-ID: 48101BDB.6080501@zato.ru (view raw or flat)
Thread:
Lists: pgsql-interfaces
Alvaro Herrera wrote:
>>  Fatal error 'Exceeded maximum lock level' at line 519 in file  
>> /usr/src/lib/libpthread/thread/thr_mutex.c (errno = 844913743)
> 
> This is clearly not a PG problem -- I'd think there's a bug in your own
> code.

This is very helpful :)

My code is just this:

int SQLLog( PGconn *conn,
         struct auth *a,
         struct client *c,
         struct request *r,
         struct data *d )
{
     char * str;
     char log[256];

     char *request;
     unsigned char *esc_bytea;
     size_t      length;
     PGresult   *res;


     if ((esc_bytea = PQescapeByteaConn(conn,d->data,d->len,&length)) == 
NULL)
     {
         snprintf(log,256, "Error: %s",PQerrorMessage(conn));
         logging(log);
         return 0;
     }

     request = malloc ( sizeof(a->user) + sizeof(c->src) +
             sizeof(r->dst) + sizeof(esc_bytea) + 110);

     sprintf(request, "INSERT INTO raw 
(username,from_addr,to_addr,rawdata,direction) VALUES 
('%s','%s','%s',E'%s',%d)", a->user,c->src,r->dst,esc_bytea,d->dir);

     res = PQexec(conn, request);

     if (PQresultStatus(res) != PGRES_COMMAND_OK)
     {
         snprintf(log,256,"failed: %s", PQerrorMessage(conn));
         logging(log);
     }

     free(request);
     PQfreemem(esc_bytea);
     PQclear(res);

     return 0;
}

int OpenSQL( PGconn **conn )
{
     char log[256];
     char *conninfo;
     conninfo = "host=localhost dbname=db user=user password=password";

     *conn = PQconnectdb(conninfo);
     if (PQstatus(*conn) != CONNECTION_OK)
     {
         snprintf(log,256, "Connection to database failed: %s",
                 PQerrorMessage(*conn));
         logging(log);
         return 1;
     } else
         return 0;
}

int CloseSQL( PGconn *conn )
{
     PQfinish(conn);
     return 0;
}


I didn't touch any mutex (i don't even sure about what is mutex). While 
not calling any of sql functions, application works just fine. In 
non-threaded mode it is working with sql functions. Where did i go wrong?

-- 
wbr, alexander

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Subject: Re: Exceeded maximum lock level
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