+++ This bug was initially created as a clone of Bug #470000 +++

Description of problem:
Following are the info collected by bug-buddy:
-----------
System: Linux 2.6.27.4-68.fc10.i686 #1 SMP Thu Oct 30 00:49:42 EDT 2008 i686
X Vendor: The X.Org Foundation
X Vendor Release: 10502000
Selinux: No
Accessibility: Disabled
GTK+ Theme: Nodoka
Icon Theme: Fedora

Memory status: size: 2960982016 vsize: 2960982016 resident: 51773440 share: 24920064 rss: 51773440 rss_rlim: 18446744073709551615
CPU usage: start_time: 1225847969 rtime: 6704 utime: 5428 stime: 1276 cutime:15 cstime: 63 timeout: 0 it_real_value: 0 frequency: 100

Backtrace was generated from '/usr/bin/pidgin'

0x00110416 in __kernel_vsyscall ()
#0  0x00110416 in __kernel_vsyscall ()
#1  0x005ce777 in poll () from /lib/libc.so.6
#2  0x00727742 in ?? () from /lib/libglib-2.0.so.0
#3  0x00727dd2 in g_main_loop_run () from /lib/libglib-2.0.so.0
#4  0x058cc489 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#5  0x080c6b86 in main (argc=1, argv=0xbffdf884) at gtkmain.c:888
The program is running.  Quit anyway (and detach it)? (y or n) [answered Y; input not from terminal]


----------- .xsession-errors ---------------------
warning: difference appears to be caused by prelink, adjusting expectations
(firefox:7163): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
(firefox:7163): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
(firefox:7163): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
(firefox:7163): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
(firefox:7163): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
(firefox:7163): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
(firefox:7163): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
--------------------------------------------------

Version-Release number of selected component (if applicable):
pidgin-2.5.2-1.fc10.i386

How reproducible:
1 / 10

Steps to Reproduce:
   set/unset Block function in Privacy
   send and receive messages
  
Actual results:
Pidgin often crash suddenly during above action. 

Expected results:
Pidgin does not crash

Additional info:

--- Additional comment from yzhou on 2008-11-05 02:24:31 EDT ---

Crash secondly:

--------
System: Linux 2.6.27.4-68.fc10.i686 #1 SMP Thu Oct 30 00:49:42 EDT 2008 i686
X Vendor: The X.Org Foundation
X Vendor Release: 10502000
Selinux: No
Accessibility: Disabled
GTK+ Theme: Nodoka
Icon Theme: Fedora

Memory status: size: 3026124800 vsize: 3026124800 resident: 54812672 share: 24596480 rss: 54812672 rss_rlim: 18446744073709551615
CPU usage: start_time: 1225867782 rtime: 2245 utime: 1917 stime: 328 cutime:4 cstime: 17 timeout: 0 it_real_value: 0 frequency: 100

Backtrace was generated from '/usr/bin/pidgin'

0x00110416 in __kernel_vsyscall ()
#0  0x00110416 in __kernel_vsyscall ()
#1  0x005ce777 in poll () from /lib/libc.so.6
#2  0x00727742 in ?? () from /lib/libglib-2.0.so.0
#3  0x00727dd2 in g_main_loop_run () from /lib/libglib-2.0.so.0
#4  0x058cc489 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#5  0x080c6b86 in main (argc=1, argv=0xbf92a9d4) at gtkmain.c:888
The program is running.  Quit anyway (and detach it)? (y or n) [answered Y; input not from terminal]


----------- .xsession-errors ---------------------
E: shm.c: mmap() failed: Cannot allocate memory
E: shm.c: mmap() failed: Cannot allocate memory
E: shm.c: mmap() failed: Cannot allocate memory
E: shm.c: mmap() failed: Cannot allocate memory
E: shm.c: mmap() failed: Cannot allocate memory
E: shm.c: mmap() failed: Cannot allocate memory
E: shm.c: mmap() failed: Cannot allocate memory
E: shm.c: mmap() failed: Cannot allocate memory
E: shm.c: mmap() failed: Cannot allocate memory
E: shm.c: mmap() failed: Cannot allocate memory
E: shm.c: mmap() failed: Cannot allocate memory
E: shm.c: mmap() failed: Cannot allocate memory
E: shm.c: mmap() failed: Cannot allocate memory
E: shm.c: mmap() failed: Cannot allocate memory
pidgin: pulse.c:203: pulse_new: Assertion `p->context' failed.
--------------------------------------------------

--- Additional comment from yzhou on 2008-11-05 04:25:35 EDT ---

It has crashed the third time, the same backtrace output with the second time.

--- Additional comment from stu on 2008-11-05 12:11:30 EDT ---

The backtrace doesn't show anything useful at all. Please install relevant debuginfo with "debuginfo-install pidgin".

> pidgin: pulse.c:203: pulse_new: Assertion `p->context' failed.

This looks like it may be crashing in pulse when trying to play a sound - if you disable sounds does it stop crashing?

Also what protocols and plugins do you use?