FreeTDS Development Group

[martin dempsey <mjd AT digitaleveryware.com>]

I'm having a problem with a program using ctlib that crashes when it
trys to connect to a second database. By adding just three lines to
the "src/ctlib/unittests/t0001.c" test program, I can cause it to
crash in the same fashion.

The "t0001.c" program does a login and logout, nothing more. If you
wrap that in a while loop so it does a couple login/logouts it
segfaults. Shouldn't you be able to login/logout to a database and
some time later be able to login again? Is this a bug or am I
confused?

The problem happens with version 0.53 and 0.51. I am using an x86
linux machine connecting to W2K/SqlServer version 7.0. The same thing
happens with NT/SqlSever 7.0

-------------- stack trace of crash  ---------------------------------

(gdb) run
Starting program: 
/home/mjd/src/acres/ticker/freetds-0.53/src/ctlib/unittests/.libs/t0001
t0001.c: Testing login, logout
Trying login
Trying logout
Trying login

Program received signal SIGSEGV, Segmentation fault.
0x69746e75 in ?? ()
(gdb) bt
#0  0x69746e75 in ?? ()
#1  0x4001ab21 in ctlib_handle_info_message (aStruct=0x804b280) at ctutil.c:38
#2  0x4001d97e in tds_process_msg (tds=0x804b280, marker=171) at token.c:1214
#3  0x4001bdaf in tds_process_default_tokens (tds=0x804b280, marker=171) at 
token.c:101
#4  0x4001bf8d in tds_process_login_tokens (tds=0x804b280) at token.c:209
#5  0x4001effc in tds_connect (login=0x804c9a8, parent=0x804b258) at 
login.c:240
#6  0x40018a61 in ct_connect (con=0x804b258, servername=0x804ace0 "acct", 
snamelen=2) at ct.c:303
#7  0x8048dd4 in try_ctlogin (ctx=0xbffffb90, conn=0xbffffb94, 
cmd=0xbffffb98, verbose=1) at common.c:82
#8  0x8048a5a in main () at t0001.c:24
(gdb)


------------ modified "src/ctlib/unittests/t0001.c" program ------

#include <stdio.h>
#include <ctpublic.h>
/*  only include this if you need access to PWD information  */
/*  #include "common.h"  */

static char  software_version[]   = "$Id: t0001.c,v 1.1.1.1 2001/10/12 
23:29:06 brianb Exp $";
static void *no_unused_var_warn[] = {software_version,
                                     no_unused_var_warn};

int main()
{
   CS_CONTEXT *ctx; 
   CS_CONNECTION *conn; 
   CS_COMMAND *cmd; 
   CS_RETCODE ret;
   int verbose = 0;
   int i = 0;    /////////////// ADDED LINE ///////////////////////

   fprintf(stdout, "%s: Testing login, logout\n", __FILE__);

   while (i++ < 100) { /////////// ADDED LINE //////////////////////

   if (verbose)         { fprintf(stdout, "Trying login\n"); }
   ret = try_ctlogin(&ctx, &conn, &cmd, verbose);
   if (ret != CS_SUCCEED) {
     fprintf(stderr, "Login failed\n");
     return 1;
   }

   if (verbose)         { fprintf(stdout, "Trying logout\n"); }
   ret = try_ctlogout(ctx, conn, cmd, verbose);
   if (ret != CS_SUCCEED) {
     fprintf(stderr, "Logout failed\n");
     return 2;
   }


   } ///////////////////////////// ADDED LINE ///////////////////////

   if (verbose)         { fprintf(stdout, "Test suceeded\n"); }
   return 0;
}

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