Issue where logfile is not created when running dmalloc.

[YJHcc]

• User Information :
  ubuntu ver : 20.04
  gcc ver : gcc (Ubuntu 10.5.0-1ubuntu1~20.04) 10.5.0
  target : jetson board (aarch64 architecture)
  system info. : 5.10.104-tegra

hello.
I have a question regarding the use of dmalloc.

The desired task is to compile the test.c source code and check memory usage(or memory leakage) using dmalloc. At this time, the dmalloc-related git clone process I applied is explained as follows.

• git clone https://github.com/j256/dmalloc.git
• ./configure
• make && make install

• dmalloc settings

  • dmalloc -l ./logfile -i 100 high > dmalloc_setup (or dmalloc -l /home/jetson/profile_test1/dmalloc/logfile -i 100 high > dmalloc_setup)
  • source dmalloc_setup
  • echo $DMALLOC_OPTIONS

• run

  • gcc -g -DDMALLOC -o test test.c -ldmalloc
  • ./test
  • cat logfile

The code in my test.c is as follows:

#include <stdio.h>
#include <stdlib.h>
#ifdef DMALLOC
#include <dmalloc.h>
#endif

int main() {
   char *ch_p = (char *)malloc(10);

  for (int j = 0; j < 2; j++)
      malloc(100);            // no free

  calloc(16, 16);             // no free
  return 0;
}

But, at this time, the logfile is not created. Any problem?

[j256]

Huh this works for me. Some things to try. First, after you source the settings, you should be able to run dmalloc again to make sure that the high debug flags and the logpath are set:

$ ./dmalloc
Debug-Flags`` 0x4f4ed03 (83160323) (internal token: high)
...
Logpath      './logfile'

Or print out the DMALLOC env variable:

$ env | grep DMALLOC
DMALLOC_OPTIONS=debug=0x4f4ed03,inter=100,log=./logfile

Next, do a nm test on your utility to make sure that it linked with libdmalloc.a correctly. You should see a bunch of _dmalloc symbols:

$ nm test | grep dmalloc
00000000000f11c0 B _dmalloc_aborting_b
00000000000f11f0 B _dmalloc_address
...

Lastly, make sure you are running your test and not the shell built in. Maybe use ./test.

$ rm -f logfile
$ ./test
$ ls -l logfile
-rw-r----- 1 j256 staff 2114 Jun 21 18:04 logfile

[matthewluckie]

I've been trying to use dmalloc on a debian trixie system. I first tried a docker container and then a virtual machine. Unfortunately, I'm not getting a logfile.

Using the same test.c and testing procedure as above on an ubuntu 24.04 system works. On both systems, I installed dmalloc (5.5.2) from apt.

$ dmalloc
Debug-Flags 0x4e48503 (82085123) (internal token: low)
Address      not-set
Interval     10000000000
Lock-On      not-set
Logpath      'logfile'
Mem-Limit    not-set
Start        not-set

Debug Malloc Utility: http://dmalloc.com/
  For a list of the command-line options enter: dmalloc --usage
$ ldd testx
        linux-vdso.so.1 (0x00007f5e7ad4d000)
        libdmalloc.so.5 => /lib/x86_64-linux-gnu/libdmalloc.so.5 (0x00007f5e7ac49000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f5e7aa53000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f5e7ad4f000)
$ nm testx | grep dmalloc
                 U dmalloc_malloc
$ ./testx 
$ ls -l
-rw-rw-r--  1 mjl mjl   260 Aug 18 13:31 test.c
-rwxrwxr-x  1 mjl mjl 17344 Aug 18 13:31 testx