[issue7494] _lsprof (cProfile): Profiler.clear() keeps references to detroyed nodes

2010-03-21 Thread STINNER Victor 

STINNER Victor victor.stin...@haypocalc.com added the comment:

 Fixed by r78641 (trunk)

Backport done: r79200 (2.6).

--
resolution:  - fixed
status: open - closed

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[issue7494] _lsprof (cProfile): Profiler.clear() keeps references to detroyed nodes

2010-03-03 Thread STINNER Victor 

STINNER Victor victor.stin...@haypocalc.com added the comment:

Sorry, but I'm unable to write a reliable unit test. You have to trust me: the 
patch fixes the issue and the issue does exist :-)

Fixed by r78641 (trunk), r78642 (py3k), r78643 (3.1).

Leave this issue open until the fix can be backported to 2.6 (after 2.6.5 
release).

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[issue7494] _lsprof (cProfile): Profiler.clear() keeps references to detroyed nodes

2010-01-13 Thread Antoine Pitrou 

Changes by Antoine Pitrou pit...@free.fr:


--
nosy: +alexandre.vassalotti

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[issue7494] _lsprof (cProfile): Profiler.clear() keeps references to detroyed nodes

2009-12-13 Thread STINNER Victor 

New submission from STINNER Victor victor.stin...@haypocalc.com:

clearEntries() delete all nodes of the profiler tree, but 
currentProfilerContext keeps a reference to a tree node 
(currentProfilerContext-previous-header attribute).

The patch fixes clearEntries() to delete all references (destroy 
currentProfilerContext and set it to NULL).

--
components: Extension Modules
files: _lsprof.patch
keywords: patch
messages: 96346
nosy: haypo
severity: normal
status: open
title: _lsprof (cProfile): Profiler.clear() keeps references to detroyed nodes
type: crash
versions: Python 2.7
Added file: http://bugs.python.org/file15543/_lsprof.patch

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[issue7494] _lsprof (cProfile): Profiler.clear() keeps references to detroyed nodes

2009-12-13 Thread STINNER Victor 

STINNER Victor victor.stin...@haypocalc.com added the comment:

The crash is an Heisenbug (read object which just has been destroyed, 
sometimes it works, sometimes it crash), so it's not easy the write a 
short example showing the crash.

The code looks like:

   import cProfile
   prof = cProfile.Profile()
   prof.enable()
   prof.clear()

The next instruction will be analyzed by the profiler, but the profiler 
will crash in: ptrace_enter_call()-initContext()-getSubEntry()-
Rotating_Tree_Get(caller-calls, entry), because caller-calls node is 
invalid.

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[issue7494] _lsprof (cProfile): Profiler.clear() keeps references to detroyed nodes

2009-12-13 Thread STINNER Victor 

STINNER Victor victor.stin...@haypocalc.com added the comment:

See also issue #3952.

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