[Bug gdb/19022] New: Duplicate memory entries in CTF (and maybe tfile?) trace file

["simon.marchi at ericsson dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19022

            Bug ID: 19022
           Summary: Duplicate memory entries in CTF (and maybe tfile?)
                    trace file
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: simon.marchi at ericsson dot com
  Target Milestone: ---

When using this test program:

----
#include <unistd.h>
#include <stdio.h>

volatile int global = 0;

int main()
{
        int i;
        for (i = 0; i < 100; i++) {
                global += i;
                printf("global is now %d\n", global);
                //sleep(1);
        }

        return 0;
}
----

and running this gdb script:

----
tar ext :1234

set default-collect global * 3

trace 11
actions
collect global
collect global * 2
end

break 15
tstart
c
tstop
tsave -ctf allo
quit
----

Using babeltrace on the output trace (directory allo) shows that there are
duplicate memory entries:

$ babeltrace allo
...
0 frame: { tpnum = 1 }, { }
0 memory: { tpnum = 1 }, { address = 0x601044, length = 4, contents = [ [0] =
10, [1] = 0, [2] = 0, [3] = 0 ] }
0 memory: { tpnum = 1 }, { address = 0x601044, length = 4, contents = [ [0] =
10, [1] = 0, [2] = 0, [3] = 0 ] }
0 memory: { tpnum = 1 }, { address = 0x601044, length = 4, contents = [ [0] =
10, [1] = 0, [2] = 0, [3] = 0 ] }
0 frame: { tpnum = 1 }, { }
0 memory: { tpnum = 1 }, { address = 0x601044, length = 4, contents = [ [0] =
15, [1] = 0, [2] = 0, [3] = 0 ] }
0 memory: { tpnum = 1 }, { address = 0x601044, length = 4, contents = [ [0] =
15, [1] = 0, [2] = 0, [3] = 0 ] }
0 memory: { tpnum = 1 }, { address = 0x601044, length = 4, contents = [ [0] =
15, [1] = 0, [2] = 0, [3] = 0 ] }
...

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