Clist append error (malloc_consolidate)

["sripurna mutalik" <sripurna007 rediffmail com>]

HI,
 I am new to this member. I am having trouble with clist. My program is a multithreaded one and it goes some 
thing like this. I create a thread after the first window comes up. That thread waits for some data to come 
over the network and when any data comes, it appends the data into the clist. 
 But whenever this statement is executed
        ... 
        gtk_clist_append(GTK_CLIST(clist1),list_data);
        ...............
a segementation fault seems to occur inside the append API. After debugging i found out that inside the 
append API, it is faulting at "malloc_consolidate". 

   I dont know what to do, even if i do not use the list_data and use statically assigned array like
           ...........
          char *dd[] = { "dd", "sdf"};
           .........
also it segment faults.

Please any suggestions or solutions are welcome.