abort when jumping out of a loop

[xdegaye]

BPO	23048
Nosy	@rhettinger, @benjaminp, @xdegaye

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/benjaminp'
closed_at = <Date 2014-12-13.21:08:30.513>
created_at = <Date 2014-12-13.11:34:33.197>
labels = ['interpreter-core', 'type-crash']
title = 'abort when jumping out of a loop'
updated_at = <Date 2014-12-14.10:15:18.481>
user = 'https://github.com/xdegaye'

bugs.python.org fields:

activity = <Date 2014-12-14.10:15:18.481>
actor = 'xdegaye'
assignee = 'benjamin.peterson'
closed = True
closed_date = <Date 2014-12-13.21:08:30.513>
closer = 'python-dev'
components = ['Interpreter Core']
creation = <Date 2014-12-13.11:34:33.197>
creator = 'xdegaye'
dependencies = []
files = []
hgrepos = []
issue_num = 23048
keywords = []
message_count = 4.0
messages = ['232604', '232614', '232622', '232635']
nosy_count = 4.0
nosy_names = ['rhettinger', 'benjamin.peterson', 'xdegaye', 'python-dev']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue23048'
versions = ['Python 3.5']

[xdegaye]

With the following jump.py script:
def foo():
import pdb; pdb.set_trace()
while 1:
pass
return # this is line 5

foo()

The following debugging session aborts on Python 3.5.0a0 (default:334c01aa7f93, Dec 3 2014, 16:20:19):
$ python jump.py

/tmp/test/jump.py(3)foo()
-> while 1:
(Pdb) next
/tmp/test/jump.py(4)foo()
-> pass
(Pdb) jump 5
python: Objects/frameobject.c:258: frame_setlineno: Assertion `blockstack_top == 0' failed.
Aborted (core dumped)

[rhettinger]

Building on OS X 10.10 with the head of the code tree (as of today), I cannot reproduce this. Also the disassembly looks fine:

$ python3.5 jump.py 
> /Users/raymond/tmp/jump.py(3)foo()
-> while 1:
(Pdb) next
> /Users/raymond/tmp/jump.py(4)foo()
-> pass
(Pdb) jump 5
> /Users/raymond/tmp/jump.py(5)foo()
-> return # this is line 5
(Pdb) list
  1  	def foo():
  2  	    import pdb; pdb.set_trace()
  3  	    while 1:
  4  	        pass
  5  ->	    return # this is line 5
  6  	
  7  	foo()
  8  	
[EOF]
(Pdb) !from dis import dis
(Pdb) !dis(foo)
  2           0 LOAD_CONST               1 (0)
              3 LOAD_CONST               0 (None)
              6 IMPORT_NAME              0 (pdb)
              9 STORE_FAST               0 (pdb)
             12 LOAD_FAST                0 (pdb)
             15 LOAD_ATTR                1 (set_trace)
             18 CALL_FUNCTION            0 (0 positional, 0 keyword pair)
             21 POP_TOP

3 22 SETUP_LOOP 3 (to 28)

4 >> 25 JUMP_ABSOLUTE 25

5 >> 28 LOAD_CONST 0 (None)
31 RETURN_VALUE
(Pdb) !import sys
(Pdb) p sys.version_info
sys.version_info(major=3, minor=5, micro=0, releaselevel='alpha', serial=0)

[python-dev]

New changeset 09f938915c6f by Benjamin Peterson in branch '3.4':
pop the loop block even for infinite while loops (closes bpo-23048)
https://hg.python.org/cpython/rev/09f938915c6f

New changeset baa5258bef22 by Benjamin Peterson in branch '2.7':
pop the loop block even for infinite while loops (closes bpo-23048)
https://hg.python.org/cpython/rev/baa5258bef22

New changeset ec96ffa6aa95 by Benjamin Peterson in branch 'default':
merge 3.4 (bpo-23048)
https://hg.python.org/cpython/rev/ec96ffa6aa95

[xdegaye]

Building on OS X 10.10 with the head of the code tree (as of today), I cannot reproduce this. Also the disassembly looks fine:

I should have mentionned that I am running a debug build of python.