U++

After updating uppsrc from svn (with draw refactoring) my app hangs randomly but often.
Here a full backtrace of hanging app :

THREADS :
(gdb) info thread
Id Target Id Frame
5 Thread 0x7fffd7142700 (LWP 23372) "TimberStruct" lll_lock_wait ()
at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:132
4 Thread 0x7fffd7df7700 (LWP 23366) "TimberStruct"
0x00007ffff604152d in nanosleep () at ../sysdeps/unix/syscall-template.S:82
2 Thread 0x7fffdef12700 (LWP 23364) "gdbus" 0x00007ffff5118303 in __GI_poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>)
at ../sysdeps/unix/sysv/linux/poll.c:87

• 1 Thread 0x7ffff7fc18c0 (LWP 23361) "TimberStruct" 0x00007ffff5118303 in GI_poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>)
  at ../sysdeps/unix/sysv/linux/poll.c:87

---------------------------------------------------------------
THREAD #1
(gdb) bt
#0 0x00007ffff5118303 in GIpoll (fds=<optimized out>,
nfds=<optimized out>, timeout=<optimized out>)
at ../sysdeps/unix/sysv/linux/poll.c:87
#1 0x00007ffff27c2972 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2 0x00007ffff27c3e47 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3 0x00007ffff27c406b in xcb_wait_for_reply ()
from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#4 0x00007ffff6992289 in _XReply () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#5 0x00007ffff698dd3d in XSync () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#6 0x000000000062b911 in Upp::Ctrl::TimerAndPaint ()
at /home/massimo/sources/upp-svn/uppsrc/CtrlCore/X11Wnd.cpp:341
#7 0x000000000062bec0 in Upp::Ctrl::EventLoop0 (ctrl=0x7fffffffb710)
at /home/massimo/sources/upp-svn/uppsrc/CtrlCore/X11Wnd.cpp:435
#8 0x0000000000612128 in operator() (this=0x7fffffffa958)
at /home/massimo/sources/upp-svn/uppsrc/Core/Cbgen.h:32
#9 Upp::Ctrl::Call (cb=...)
at /home/massimo/sources/upp-svn/uppsrc/CtrlCore/CtrlMt.cpp:132
#10 0x000000000061245d in Upp::Ctrl::EventLoop (ctrl=0x7fffffffb710)
at /home/massimo/sources/upp-svn/uppsrc/CtrlCore/CtrlMt.cpp:231
#11 0x0000000000621eac in Upp::TopWindow::Run (this=0x7fffffffb710,
appmodal=<optimized out>)
at /home/massimo/sources/upp-svn/uppsrc/CtrlCore/TopWindow.cpp:327
#12 0x0000000000418a16 in GuiMainFn ()
at /home/massimo/sources/upp-svn/TimberStruct/TimberStruct/TimberStruct.cpp:975
#13 0x000000000069f73e in Upp::AppExecute__ (app=<optimized out>)
at /home/massimo/sources/upp-svn/uppsrc/Core/App.cpp:322
#14 0x0000000000409d32 in main (argc=<optimized out>, argv=<optimized out>,
envptr=<optimized out>)
at /home/massimo/sources/upp-svn/TimberStruct/TimberStruct/TimberStruct.cpp:828
---------------------------------------------------------------
THREAD #2
#0 0x00007ffff5118303 in GI_poll (fds=<optimized out>,
nfds=<optimized out>, timeout=<optimized out>)
at ../sysdeps/unix/sysv/linux/poll.c:87
#1 0x00007ffff3c8ad84 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007ffff3c8b1e2 in g_main_loop_run ()
from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007ffff447b3b6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4 0x00007ffff3cae645 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5 0x00007ffff6039e9a in start_thread (arg=0x7fffdef12700)
at pthread_create.c:308
#6 0x00007ffff5123cbd in clone ()
at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7 0x0000000000000000 in ?? ()
---------------------------------------------------------------
THREAD #4
#0 0x00007ffff604152d in nanosleep () at ../sysdeps/unix/syscall-template.S:82
#1 0x00000000006b18ee in Upp::Sleep (msec=<optimized out>)
at /home/massimo/sources/upp-svn/uppsrc/Core/Util.cpp:173
#2 0x00000000004d6f29 in Upp::Uniq::pollCb (this=0x7fffffffabd0)
at /home/massimo/sources/upp-svn/bazaar/Uniq/Posix.cpp:67
#3 0x000000000068a96a in operator() (this=0x7fffdc3d1840)
at /home/massimo/sources/upp-svn/uppsrc/Core/Cbgen.h:32
#4 Upp::sThreadRoutine (arg=0x7fffdc3d1840)
at /home/massimo/sources/upp-svn/uppsrc/Core/Mt.cpp:75
#5 0x00007ffff6039e9a in start_thread (arg=0x7fffd7df7700)
at pthread_create.c:308
#6 0x00007ffff5123cbd in clone ()
at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7 0x0000000000000000 in ?? ()
---------------------------------------------------------------
THREAD #5
#0 __lll_lock_wait ()
at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:132
#1 0x00007ffff603c080 in _L_lock_903 ()
from /lib/x86_64-linux-gnu/libpthread.so.0
#2 0x00007ffff603bf19 in __pthread_mutex_lock (
mutex=0x1fcec68 <Upp::sGLock+8>) at pthread_mutex_lock.c:82
#3 0x0000000000611f06 in Upp::EnterGuiMutex ()
at /home/massimo/sources/upp-svn/uppsrc/CtrlCore/CtrlMt.cpp:58
#4 0x00000000006166d1 in GuiLock (this=<synthetic pointer>)
at /home/massimo/sources/upp-svn/uppsrc/CtrlCore/CtrlCore.h:37
#5 Upp::Ctrl::GetView (this=0x7fffd7345e70)
at /home/massimo/sources/upp-svn/uppsrc/CtrlCore/CtrlPos.cpp:62
#6 0x000000000061673a in Upp::Ctrl::GetSize (this=<optimized out>)
at /home/massimo/sources/upp-svn/uppsrc/CtrlCore/CtrlPos.cpp:68
#7 0x000000000046c8de in Upp::ArrayCtrl::SyncLineCtrls (
this=this@entry=0x7fffd7345e70, i=i@entry=0, p=p@entry=0x0)
at /home/massimo/sources/upp-svn/uppsrc/CtrlLib/ArrayCtrl.cpp:643
#8 0x000000000046d193 in Upp::ArrayCtrl::GetCtrl (this=0x7fffd7345e70, i=0,
col=4) at /home/massimo/sources/upp-svn/uppsrc/CtrlLib/ArrayCtrl.cpp:251
#9 0x00000000007dc6a4 in InternalForcesCtrl::GetLoadCases (
this=0x7fffd7345ca8)
at /home/massimo/sources/upp-svn/TimberStruct/TimberControls/Forces.cpp:267
#10 0x00000000004de21c in JointInternalPlate1::Calculate (this=0x7fffd733d028)
at /home/massimo/sources/upp-svn/TimberStruct/TimberJoints/JointInternalPlate1.cpp:721
#11 0x00000000004b8a16 in Page::CalcThreadCb (this=0x7fffd733d028)
at /home/massimo/sources/upp-svn/TimberStruct/TimberGui/Page.cpp:167
#12 0x000000000068a96a in operator() (this=0x7fffdc40a840)
at /home/massimo/sources/upp-svn/uppsrc/Core/Cbgen.h:32
#13 Upp::sThreadRoutine (arg=0x7fffdc40a840)
at /home/massimo/sources/upp-svn/uppsrc/Core/Mt.cpp:75
#14 0x00007ffff6039e9a in start_thread (arg=0x7fffd7142700)
at pthread_create.c:308
#15 0x00007ffff5123cbd in clone ()
at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#16 0x0000000000000000 in ?? ()