Ubuntu
python2.7 package

pydoc2.7 crashed with SIGSEGV in __find_specmb()

Bug #974807 reported by Taylor "Ripps" LeMasurier-Wren on 2012-04-06

This bug affects 11 people

Affects		Status	Importance	Assigned to	Milestone
	pygobject (Ubuntu)	Invalid	Undecided	Unassigned
	python2.7 (Ubuntu)	New	Medium	Unassigned

Bug Description

Was looking up some stuff in the graphical pydoc interface when it crashed.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: python2.7 2.7.3~rc2-1ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-22.35-generic 3.2.14
Uname: Linux 3.2.0-22-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0-0ubuntu4
Architecture: amd64
Date: Thu Apr 5 21:48:18 2012
ExecutablePath: /usr/bin/pydoc2.7
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
InterpreterPath: /usr/bin/python2.7
ProcCmdline: /usr/bin/python2.7 /usr/bin/pydoc -g
SegvReason: writing VMA None
Signal: 11
SourcePackage: python2.7
Title: pydoc2.7 crashed with SIGSEGV in g_type_get_qdata()
UpgradeStatus: Upgraded to precise on 2012-01-05 (91 days ago)
UserGroups: adm admin audio cdrom dialout kvm libvirtd lpadmin mythtv plugdev sambashare vboxusers video

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Taylor "Ripps" LeMasurier-Wren (ripps818) wrote on 2012-04-06:

Dependencies.txt Edit (692 bytes, text/plain; charset="utf-8")
Disassembly.txt Edit (914 bytes, text/plain; charset="utf-8")
ProcEnviron.txt Edit (150 bytes, text/plain; charset="utf-8")
ProcMaps.txt Edit (56.7 KiB, text/plain; charset="utf-8")
ProcStatus.txt Edit (836 bytes, text/plain; charset="utf-8")
Registers.txt Edit (843 bytes, text/plain; charset="utf-8")
SegvAnalysis.txt Edit (307 bytes, text/plain; charset="utf-8")
Stacktrace.txt Edit (241.1 KiB, text/plain; charset="utf-8")
StacktraceTop.txt Edit (326 bytes, text/plain; charset="utf-8")
ThreadStacktrace.txt Edit (244.6 KiB, text/plain; charset="utf-8")

Revision history for this message

Apport retracing service (apport) wrote on 2012-04-06: Stacktrace.txt

Stacktrace.txt Edit (3.9 KiB, text/plain)

Revision history for this message

Apport retracing service (apport) wrote on 2012-04-06: StacktraceTop.txt

StacktraceTop.txt Edit (413 bytes, text/plain)

Revision history for this message

Apport retracing service (apport) wrote on 2012-04-06: ThreadStacktrace.txt

ThreadStacktrace.txt Edit (8.9 KiB, text/plain)

Changed in python2.7 (Ubuntu):
importance:	Undecided → Medium
summary:	- pydoc2.7 crashed with SIGSEGV in g_type_get_qdata() + pydoc2.7 crashed with SIGSEGV in __find_specmb()
tags:	removed: need-amd64-retrace

Matthias Klose (doko) on 2012-04-20

visibility:

private → public

Revision history for this message

Launchpad Janitor (janitor) wrote on 2012-04-20:

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in python2.7 (Ubuntu):
status:	New → Confirmed

Revision history for this message

Matthias Klose (doko) wrote on 2012-04-20:

while pydoc shouldn't crash, there seems to be an issue importing some pygtk/pygobject module.

Revision history for this message

Launchpad Janitor (janitor) wrote on 2012-04-20:

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in pygobject (Ubuntu):
status:	New → Confirmed

Revision history for this message

Martin Pitt (pitti) wrote on 2012-09-17:

pydoc -g uses python-tk, not pygobject.

affects:	pygobject (Ubuntu) → python-stdlib-extensions (Ubuntu)
Changed in python-stdlib-extensions (Ubuntu):
status:	Confirmed → New

Revision history for this message

Launchpad Janitor (janitor) wrote on 2012-09-19:

#10

Status changed to 'Confirmed' because the bug affects multiple users.

Revision history for this message

Matthias Klose (doko) wrote on 2012-09-19:

#11

Martin, the reassignment is incorrect. There's no tk function showing up.

pydoc probably shouldn't blindly import any module, but by doing so it crashes somewhere in the pygobject extension modules. maybe mark it as invalid for pygobject. I don't want to track this down either.

affects:

python-stdlib-extensions (Ubuntu) → pygobject (Ubuntu)

Launchpad Janitor (janitor) on 2012-09-19

Changed in pygobject (Ubuntu):
status:	New → Confirmed

Revision history for this message

Martin Pitt (pitti) wrote on 2012-09-20:

#12

Ah, I see. Taylor, can you please describe the steps to reproduce this crash? The stack trace is absolutely useless, so I need a reproducer. Thanks!

Changed in pygobject (Ubuntu):
status:	New → Incomplete
Changed in python2.7 (Ubuntu):
status:	Confirmed → Invalid

Revision history for this message

Martin Pitt (pitti) wrote on 2012-09-20:

#13

Oh, I see what's wrong in https://launchpadlibrarian.net/100297867/ProcMaps.txt: It does seem to actually import all the modules into a non-private namespace. With that it loads e. g. gobject/glib/gtk several times, once through all the static bindings (pygtk), and once again through the GI bindings. That's impossible I'm afraid, and will lead to random crashes. That's not something that really can be fixed in these individual libraries. So either pydoc stops importing the modules and executing stuff in them, or this is a case of "don't do that then".

Changed in pygobject (Ubuntu):
status:	Incomplete → Invalid
Changed in python2.7 (Ubuntu):
status:	Invalid → Won't Fix
status:	Won't Fix → New

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pydoc2.7 crashed with SIGSEGV in __find_specmb()

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python2.7 package