[Bug python/18655] New: GDB Python FinishBreakpoints are not deleted

[simon.marchi at ericsson dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18655

            Bug ID: 18655
           Summary: GDB Python FinishBreakpoints are not deleted
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: simon.marchi at ericsson dot com
  Target Milestone: ---

I am not completely certain that this is a bug, but here it is anyway. 
FinishBreakpoints are intended to be temporary, once the frame it's attached to
disappears, the breakpoint should vanish.  It is not the case currently.  I
believe this could be a problem when you start having a few thousand
breakpoints...

I will attach the example C and Python code. Here is a transcript showing that
FinishBreakpoints just keep piling up.  I used internal breakpoints to avoid
the verbose output, but it doesn't really matter.


$ gdb -nx -ex "set pagination off" a.out -x test.py
Reading symbols from a.out...done.
(gdb) r
Starting program: /home/emaisin/a.out 
Return value is 0
Return value is 0
Return value is 0
Return value is 0
Return value is 0
Return value is 0
Return value is 0
Return value is 0
Return value is 0
Return value is 0
Return value is 0
Return value is 1
Return value is 2
Return value is 3
Return value is 4
Return value is 5
Return value is 6
Return value is 7
Return value is 8
Return value is 9
Return value is 0
Return value is 2
Return value is 4
Return value is 6
Return value is 8
Return value is 10
Return value is 12
Return value is 14
Return value is 16
Return value is 18
Return value is 0
Return value is 3
Return value is 6
Return value is 9
Return value is 12
Return value is 15
Return value is 18
Return value is 21
Return value is 24
Return value is 27
Return value is 0
Return value is 4
Return value is 8
Return value is 12
Return value is 16
Return value is 20
Return value is 24
Return value is 28
Return value is 32
Return value is 36
Return value is 0
Return value is 5
Return value is 10
Return value is 15
Return value is 20
Return value is 25
Return value is 30
Return value is 35
Return value is 40
Return value is 45

Temporary breakpoint -65, main () at test.c:13
13                      for (j = 0; j < 10; j++)
(gdb) maintenance info breakpoints 
Num     Type           Disp Enb Address            What
-1      breakpoint     keep y   0x00000000004004f7 in fonction at test.c:4 inf
1
-2      shlib events   keep y   0x00007ffff7dea970 <_dl_debug_state> inf 1
-3      longjmp master keep n   0x00007ffff7a4bb30 <siglongjmp> inf 1
-4      longjmp master keep n   0x00007ffff7a4bb30 <siglongjmp> inf 1
-5      longjmp master keep n   0x00007ffff7a4bb30 <siglongjmp> inf 1
-6      breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-7      breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-8      breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-9      breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-10     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-11     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-12     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-13     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-14     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-15     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-16     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-17     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-18     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-19     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-20     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-21     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-22     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-23     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-24     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-25     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-26     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-27     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-28     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-29     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-30     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-31     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-32     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-33     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-34     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-35     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-36     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-37     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-38     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-39     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-40     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-41     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-42     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-43     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-44     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-45     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-46     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-47     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-48     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-49     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-50     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-51     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-52     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-53     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-54     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-55     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-56     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-57     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-58     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-59     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-60     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-61     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-62     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-63     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
-64     breakpoint     del  n   0x0000000000400529 in main at test.c:13 inf 1
thread 1
        stop only in thread 1
(gdb)

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