[LTP] Question on testcase/kerne/io/ltp-aiodio/fsx-linux !

[Rui D. <di...@cn...>]

Hi,All
 
       Recently,I run LTP test on RHLE4 (2.6.9-5.EL) using the fsx-linux 
case(testcase/kerne/io/ltp-aiodio/fsx-linux).
       This test case fsx-linux ,has draged out a defect with linux 
kernel.
 
       When I run the test case,the mem and swap was eat up gradully.At 
last,the system crashed because of 
       out of memory and killed many other process.In other word ,this 
test case has failed.
 
       But,when I terminated the process of fsx before the system went 
down ,the swap and mem were 
       nerver returned back to normal.And I was sure that there was no 
other process related with fsx-linux. 
       It Looks like kernel never free the memory and swap spaces that 
fsx-linux had ever occupied when it was terminated.

       I diged into the code fsx-linux.c and found a interesing thing 
 
       on fsx-linux.c line 1114
 
                        original_buf = (char *) malloc(maxfilelen);

        and on line 1117
 
                        good_buf = (char *) malloc(maxfilelen);
 
       It seems like to use malloc function to obtain heap memory 
dynamiclly.
       But I also found one more thing is there is no corresponding free 
function in this code.
       I was very curious about this.
 
       I have also did a experiment,I make a liittle change to the code 
,add corresponding free function.
       Make and run.Oops! There is no same phenomenon occured.This case 
has passed!
 
       So can someone give a clear explaination about this ?
       What is the purpose of this case?
       Or give me clue to find out what is going on in the swap and mem on 
earth? 
       Or something else?
       Thaks.
 
       -------------------------------------
       Best Regards & Thanks 
       Rickey 
       2005.11.7