[New-bugs-announce] [issue5294] pdb "break" command messes up "continue"

[Petr Viktorin]

New submission from Petr Viktorin <encukou at gmail.com>:

Consider this program:

import pdb

pdb.set_trace()

print ("At line 5")
print ("At line 6")
print ("At line 7")
print ("At line 8")
print ("At line 9")

When set_trace starts the debugger, I set a breakpoint at line 8. When I
do that, the continue command starts single-stepping instead of what it
usually does.
Also, the module will appear twice on the call stack (although pdb won't
show this).

Here is the pdb session:

$ python pdbfail.py
> /home/petr/tmp/pdbfail.py(5)<module>()
-> print ("At line 5")
(Pdb) break 8
Breakpoint 1 at /home/petr/tmp/pdbfail.py:8
(Pdb) continue
At line 5
> /home/petr/tmp/pdbfail.py(6)<module>()
-> print ("At line 6")
(Pdb) continue
At line 6
> /home/petr/tmp/pdbfail.py(7)<module>()
-> print ("At line 7")
(Pdb) where
> /home/petr/tmp/pdbfail.py(7)<module>()
-> print ("At line 7")
(Pdb) quit
Traceback (most recent call last):
  File "pdbfail.py", line 7, in <module>
    print ("At line 7")
  File "pdbfail.py", line 7, in <module>
    print ("At line 7")
  File "/usr/lib/python2.5/bdb.py", line 48, in trace_dispatch
    return self.dispatch_line(frame)
  File "/usr/lib/python2.5/bdb.py", line 67, in dispatch_line
    if self.quitting: raise BdbQuit
bdb.BdbQuit

----------
components: Library (Lib)
messages: 82322
nosy: En-Cu-Kou
severity: normal
status: open
title: pdb "break" command messes up "continue"
versions: Python 2.6, Python 3.0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5294>
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