Elisa locks on exit under linux

When quitting, elisa locks with the following backtrace:

Thread 3 (Thread 0xb5ea1b90 (LWP 25724)):
#0 0xb7fa940e in __kernel_vsyscall ()
#1 0xb7f7dd05 in sem_wait@@GLIBC_2.1 () from /lib/tls/i686/cmov/libpthread.so.0
#2 0x080f22e5 in PyThread_acquire_lock (lock=0x8291660, waitflag=1) at ../Python/thread_pthread.h:349
#3 0x080c32dc in PyEval_RestoreThread (tstate=0x99761c0) at ../Python/ceval.c:312
#4 0x080e89dc in PyGILState_Ensure () at ../Python/pystate.c:578
#5 0xb7b0dd25 in ?? () from /var/lib/python-support/python2.5/gtk-2.0/gobject/_gobject.so
#6 0xb7a32354 in ?? () from /usr/lib/libglib-2.0.so.0
#7 0xb7a3294e in ?? () from /usr/lib/libglib-2.0.so.0
#8 0xb7a34a3c in g_source_remove () from /usr/lib/libglib-2.0.so.0
#9 0xb7964cd8 in do_quit (context=0x842fcd4, data=0x0) at pgmcontext.c:815
#10 0xb79640f0 in flush_task_queue (context=0x919c018, queue=<value optimized out>) at pgmcontext.c:994
#11 0xb796686e in immediate_io_cb (source=0x906e4c8, condition=G_IO_IN, data=0x919c018) at pgmcontext.c:1015
#12 0xb7a66c5d in ?? () from /usr/lib/libglib-2.0.so.0
#13 0xb7a32bf8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#14 0xb7a35e5e in ?? () from /usr/lib/libglib-2.0.so.0
#15 0xb7a361e7 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#16 0xb7965cde in render_loop (data=0x919c018) at pgmcontext.c:1312
#17 0xb7a5aa6f in ?? () from /usr/lib/libglib-2.0.so.0
#18 0xb7f774fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#19 0xb7ecbe5e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7df48c0 (LWP 25712)):
#0 0xb7fa9410 in __kernel_vsyscall ()
#1 0xb7f78775 in pthread_join () from /lib/tls/i686/cmov/libpthread.so.0
#2 0xb7cd3a46 in ?? () from /usr/lib/libgthread-2.0.so.0
#3 0xb7a5a70f in g_thread_join () from /usr/lib/libglib-2.0.so.0
#4 0xb79645f0 in pgm_context_free (context=0x919c018) at pgmcontext.c:1428
#5 0xb79718b8 in pgm_gl_viewport_dispose (object=0x919b060) at pgmglviewport.c:1154
#6 0xb7ab883c in g_object_unref () from /usr/lib/libgobject-2.0.so.0
#7 0xb7b1c47b in ?? () from /var/lib/python-support/python2.5/gtk-2.0/gobject/_gobject.so
#8 0x08111a68 in frame_clear (f=0x0) at ../Objects/frameobject.c:501
#9 0x080f4882 in collect (generation=2) at ../Modules/gcmodule.c:713
#10 0x080f4df5 in PyGC_Collect () at ../Modules/gcmodule.c:1265
#11 0x080ea2da in Py_Finalize () at ../Python/pythonrun.c:389
#12 0x08058d68 in Py_Main (argc=1, argv=0xbff93554) at ../Modules/main.c:545
#13 0x080587f2 in main (argc=Cannot access memory at address 0x0
) at ../Modules/python.c:23
#0 0xb7fa940e in __kernel_vsyscall ()

This is likely to be a pigment bug, and therefore a bug is opened for pigment:
https://code.fluendo.com/pigment/trac/ticket/261