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From: "j3.soon777 at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug python/29603] New: Python Watchpoints are not deleted
Date: Fri, 23 Sep 2022 08:02:52 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29603

            Bug ID: 29603
           Summary: Python Watchpoints are not deleted
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: j3.soon777 at gmail dot com
  Target Milestone: ---

In Python, if we register a local software watchpoint and set the
`Breakpoint.stop' function to always return `False', the watchpoint will no=
t be
deleted when going out of scope.

This cause gdb to incorrectly trigger the `Breakpoint.stop' function many m=
ore
times than it should.

This issue is reproduced in:
- GCC 7.5.0 & GDB 10.2 on Ubuntu 18.04,
- GCC 9.3.0 & GDB 9.2 on Ubuntu 20.04 (WSL on Windows),
- GCC 11.2.0 & GDB 12.0.90 on Ubuntu 22.04,
- and on current GDB HEAD (commit 8e037eae6823caf5b9cb5b4feb3de838abb25956).

Please see the attachment for the testing files.

Commands to reproduce:

        gcc -g test.c
        gdb a.out
        (gdb) set can-use-hw-watchpoints 0
        (gdb) b main
        (gdb) r
        (gdb) source test.py
        (gdb) c
        Continuing.
        Watchpoint Hit: 1
        Watchpoint Hit: 2
        Watchpoint Hit: 3

        Watchpoint 2 deleted because the program has left the block in
        which its expression is valid.
        Watchpoint Hit: 4

        Watchpoint 2 deleted because the program has left the block in
        which its expression is valid.
        Watchpoint Hit: 5

        Watchpoint 2 deleted because the program has left the block in
        which its expression is valid.
        Watchpoint Hit: 6

        ...

        Watchpoint 2 deleted because the program has left the block in
        which its expression is valid.
        Watchpoint Hit: 1201

        Watchpoint 2 deleted because the program has left the block in
        which its expression is valid.
        Watchpoint Hit: 1202

        Watchpoint 2 deleted because the program has left the block in
        which its expression is valid.
        Watchpoint Hit: 1203
        [Inferior 1 (process 17119) exited normally]

Please note that the Watchpoint in the test file should only be hit 4 times.

I'm currently working on a patch to fix this bug.

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