pygtk's pangocairo module crashes pydoc search

[John McPherson]

Ubuntu 12.04, 64bit

Python crashes every time I run "pydoc -k $something", which should search all installed modules to find keywords from the doc strings.

Eg:
$ pydoc -k subprocess
subprocess - subprocess - Subprocesses with accessible I/O streams

** (python2.7:22364): CRITICAL **: pyg_register_boxed: assertion `boxed_type != 0' failed
zsh: segmentation fault (core dumped) pydoc -k subprocess

If I strace it, I see that the last python module read is pygtk:
open("/usr/lib/python2.7/dist-packages/gtk-2.0/atk.so", O_RDONLY) = 11
open("/usr/lib/python2.7/dist-packages/gtk-2.0/atk.so", O_RDONLY|O_CLOEXEC) = 12
open("./pangocairo.so", O_RDONLY) = -1 ENOENT (No such file or directory)
...
open("/usr/lib/python2.7/dist-packages/gtk-2.0/pangocairo.so", O_RDONLY|O_CLOEXEC) = 12

** (python2.7:22008): CRITICAL **: pyg_register_boxed: assertion `boxed_type != 0' failed
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV (core dumped) +++
zsh: segmentation fault (core dumped) strace -eopen pydoc -k id3

[Launchpad Janitor (janitor)]

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

[Alexandr Novel (normalex)]

i do confirm same problem with pangocairo.so crasing pydoc
system is 64 bit, on 32 bit works without problems.

$ file /usr/lib/python2.7/dist-packages/gtk-2.0/pangocairo.so
/usr/lib/python2.7/dist-packages/gtk-2.0/pangocairo.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=0xe807ac0ccf8534a420d04777b8f229c0b8e18c56, stripped

.....................
open("/usr/lib/python2.7/dist-packages/gtk-2.0/pango.so", O_RDONLY) = 9
fstat(9, {st_mode=S_IFREG|0644, st_size=171008, ...}) = 0

.......................

open("/usr/lib/python2.7/dist-packages/gtk-2.0/pangocairo.so", O_RDONLY|O_CLOEXEC) = 10
read(10, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\36\0\0\0\0\0\0"..., 832) = 832
fstat(10, {st_mode=S_IFREG|0644, st_size=20352, ...}) = 0
mmap(NULL, 2115592, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 10, 0) = 0x7fcbb99a6000
mprotect(0x7fcbb99aa000, 2093056, PROT_NONE) = 0
mmap(0x7fcbb9ba9000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 10, 0x3000) = 0x7fcbb9ba9000
close(10) = 0
mprotect(0x7fcbb9ba9000, 4096, PROT_READ) = 0
close(9) = 0
open("/usr/lib/x86_64-linux-gnu/gconv/gconv-modules.cache", O_RDONLY) = 9
fstat(9, {st_mode=S_IFREG|0644, st_size=26258, ...}) = 0
mmap(NULL, 26258, PROT_READ, MAP_SHARED, 9, 0) = 0x7fcbc7fbd000
close(9) = 0
futex(0x7fcbc6c54b10, FUTEX_WAKE_PRIVATE, 2147483647) = 0
write(2, "\n** (python:17514): CRITICAL **:"..., 88
** (python:17514): CRITICAL **: pyg_register_boxed: assertion `boxed_type != 0' failed
) = 88
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV (core dumped) +++
Segmentation fault (core dumped)

[Alexandr Novel (normalex)]

actually it fails on a different 32bit fresh install of Precise 12.04 as well.

open("/usr/lib/python2.7/dist-packages/gtk-2.0/pangocairo.so", O_RDONLY|O_LARGEFILE) = 9
fstat64(9, {st_mode=S_IFREG|0644, st_size=18744, ...}) = 0
open("/usr/lib/python2.7/dist-packages/gtk-2.0/pangocairo.so", O_RDONLY|O_CLOEXEC) = 10
read(10, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0@\23\0\0004\0\0\0"..., 512) = 512
fstat64(10, {st_mode=S_IFREG|0644, st_size=18744, ...}) = 0
mmap2(NULL, 21540, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 10, 0) = 0xdcb000
mprotect(0xdce000, 4096, PROT_NONE) = 0
mmap2(0xdcf000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 10, 0x3) = 0xdcf000
close(10) = 0
mprotect(0xdcf000, 4096, PROT_READ) = 0
close(9) = 0
write(2, "\n** (python2.7:10739): CRITICAL "..., 91
** (python2.7:10739): CRITICAL **: pyg_register_boxed: assertion `boxed_type != 0' failed
) = 91
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV (core dumped) +++
Segmentation fault (core dumped)