[Bug python/34379] New: Self deleting breakpoints crash gdb

https://sourceware.org/bugzilla/show_bug.cgi?id=34379

            Bug ID: 34379
           Summary: Self deleting breakpoints crash gdb
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: nathan.titirangi at gmail dot com
  Target Milestone: ---

Tested on gdb version "GNU gdb (GDB) 18.0.50.20260709-git" and an older gdb
version.

Source the following python script

```py
import gdb

class CrashingBreakpoint(gdb.Breakpoint):
    def __init__(self, *args, **kwargs) -> None:
        super().__init__(*args, **kwargs)

    def stop(self):
        self.delete()
        return False
```

And then place the breakpoint somewhere where it will be hit via `python
CrashingBreakpoint("*main+24")` or similar. When it is hit gdb will immediately
crash with the following backtrace:

Fatal signal: Segmentation fault
----- Backtrace -----
0x631993b4b691 gdb_internal_backtrace_1
      /home/nathan/Documents/code/binutils-gdb/gdb/bt-utils.c:122
0x631993b4b691 _Z22gdb_internal_backtracev
      /home/nathan/Documents/code/binutils-gdb/gdb/bt-utils.c:173
0x631993c9d8d3 handle_fatal_signal
      /home/nathan/Documents/code/binutils-gdb/gdb/event-top.c:1008
0x631993c9de79 handle_sigsegv
      /home/nathan/Documents/code/binutils-gdb/gdb/event-top.c:1085
0x70ac51c4532f ???
0x631993b221a5 _Z22bpstat_explains_signalP6bpstat10gdb_signal
      /home/nathan/Documents/code/binutils-gdb/gdb/breakpoint.c:4731
0x631993d3598b handle_signal_stop
      /home/nathan/Documents/code/binutils-gdb/gdb/infrun.c:7252
0x631993d3699d handle_stop_requested
      /home/nathan/Documents/code/binutils-gdb/gdb/infrun.c:5230
0x631993d3699d handle_stop_requested
      /home/nathan/Documents/code/binutils-gdb/gdb/infrun.c:5225
0x631993d3699d handle_inferior_event
      /home/nathan/Documents/code/binutils-gdb/gdb/infrun.c:6696
0x631993d384af _Z20fetch_inferior_eventv
      /home/nathan/Documents/code/binutils-gdb/gdb/infrun.c:4756
0x631994158185 gdb_wait_for_event
      /home/nathan/Documents/code/binutils-gdb/gdbsupport/event-loop.cc:694
0x631994158966 _Z16gdb_do_one_eventi
      /home/nathan/Documents/code/binutils-gdb/gdbsupport/event-loop.cc:216
0x631993d92379 _ZN6interp12do_one_eventEi
      /home/nathan/Documents/code/binutils-gdb/gdb/interps.h:90
0x631993d92379 start_event_loop
      /home/nathan/Documents/code/binutils-gdb/gdb/main.c:401
0x631993d92379 captured_command_loop
      /home/nathan/Documents/code/binutils-gdb/gdb/main.c:466
0x631993d94804 captured_main
      /home/nathan/Documents/code/binutils-gdb/gdb/main.c:1374
0x631993d94804 _Z8gdb_mainP18captured_main_args
      /home/nathan/Documents/code/binutils-gdb/gdb/main.c:1393
0x631993a78e6b main
      /home/nathan/Documents/code/binutils-gdb/gdb/gdb.c:38
---------------------

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