pydoc2.7 crashed with SIGSEGV in g_type_get_qdata()

[Pi Delport]

This happens while attempting pydoc -k.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: python2.7 2.7.2-5ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
CrashCounter: 1
Date: Tue Jan 24 12:45:53 2012
ExecutablePath: /usr/bin/pydoc2.7
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
InterpreterPath: /usr/bin/python2.7
ProcCmdline: /usr/bin/python2.7 /usr/bin/pydoc -k yaml
SegvAnalysis:
 Segfault happened at: 0x7f39f50dd58b <vfprintf+155>: callq 0x7f39f5121e60 <strchrnul>
 PC (0x7f39f50dd58b) ok
 source "0x7f39f5121e60" (0x7f39f5121e60) ok
 destination "(%rsp)" (0x7ffff69d4f70) not located in a known VMA region (needed writable region)!
 Stack memory exhausted (SP below stack segment)
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: python2.7
StacktraceTop:
 g_type_get_qdata () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/python2.7/dist-packages/gobject/_gobject.so
 ?? () from /usr/lib/python2.7/dist-packages/gobject/_gobject.so
 ?? () from /usr/lib/python2.7/dist-packages/gobject/_gobject.so
 ?? () from /usr/lib/python2.7/dist-packages/gobject/_gobject.so
Title: pydoc2.7 crashed with SIGSEGV in g_type_get_qdata()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: admin

[Apport retracing service (apport)]

StacktraceTop:
 g_type_get_qdata (type=<optimized out>, quark=55) at /build/buildd/glib2.0-2.30.0/./gobject/gtype.c:3668
 pygobject_lookup_class (gtype=0) at /build/buildd/pygobject-2-2.28.6/gobject/pygobject.c:905
 pygobject_lookup_class (gtype=0) at /build/buildd/pygobject-2-2.28.6/gobject/pygobject.c:894
 pyg_type_get_bases (gtype=0) at /build/buildd/pygobject-2-2.28.6/gobject/pygobject.c:659
 pygobject_new_with_interfaces (gtype=0) at /build/buildd/pygobject-2-2.28.6/gobject/pygobject.c:702

[Pi Delport (pi-delport)]

This looks like an "assertion failed" debug print:

#0 __find_specmb (format=0x7f39f1f40732 "%s: assertion `%s' failed") at printf-parse.h:99

is causing unbounded recursion involving the following loop:

...
#10 pygobject_lookup_class (gtype=0) at /build/buildd/pygobject-2-2.28.6/gobject/pygobject.c:894
#11 0x00007f39e88b9032 in pyg_type_get_bases (gtype=0) at /build/buildd/pygobject-2-2.28.6/gobject/pygobject.c:659
#12 0x00007f39e88b90e2 in pygobject_new_with_interfaces (gtype=0) at /build/buildd/pygobject-2-2.28.6/gobject/pygobject.c:702
#13 0x00007f39e88b8fe5 in pygobject_lookup_class (gtype=0) at /build/buildd/pygobject-2-2.28.6/gobject/pygobject.c:913
#14 pygobject_lookup_class (gtype=0) at /build/buildd/pygobject-2-2.28.6/gobject/pygobject.c:894
...

[Pi Delport (pi-delport)]

The last line output just before the segfault:

...
** (python2.7:8669): CRITICAL **: pyg_register_boxed: assertion `boxed_type != 0' failed