I have a reproductible crash with xorgxrdp:
with rdesktop or xfreerdp:
geometry 1900x1100
xcfe4 desktop from wheezy
launch screensaver "galaxy"
(/usr/lib/xscreensaver/galaxy) from xscreensaver-data package
Here is the backtrace:

[351875.954] rdpDeferredUpdateCallback: reschedual rect_id 38 rect_id_ack 37
[351876.049] rdpClientConSendMsg: overrun error len 38472 count 2
[351876.153] rdpClientConSendMsg: overrun error len 44016 count 2
[351876.218] rdpClientConSendMsg: overrun error len 43712 count 2
[351876.282] rdpClientConSendMsg: overrun error len 44232 count 2
[351876.347] rdpClientConSendMsg: overrun error len 44152 count 2
[351876.404] rdpClientConSendMsg: overrun error len 43936 count 2
[351876.462] rdpClientConSendMsg: overrun error len 43672 count 2
[351876.515] rdpClientConSendMsg: overrun error len 44104 count 2
[351876.566] rdpClientConSendMsg: overrun error len 43960 count 2
[351876.618] rdpClientConSendMsg: overrun error len 43736 count 2
[351876.669] rdpClientConSendMsg: overrun error len 43792 count 2
[351876.722] rdpClientConSendMsg: overrun error len 42856 count 2
[351876.774] rdpClientConSendMsg: overrun error len 43048 count 2
[351876.826] rdpClientConSendMsg: overrun error len 43288 count 2
[351876.880] rdpClientConSendMsg: overrun error len 43400 count 2
351876.918
351876.919 Backtrace:
351876.919 0: Xorg (xorg_backtrace+0x56) [0x7f9efa859d46]
351876.919 1: Xorg (0x7f9efa6a3000+0x1baf29) [0x7f9efa85df29]
351876.919 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f9ef8397000+0x35180) [0x7f9ef83cc180]
351876.919 3: Xorg (dixLookupResourceByClass+0x88) [0x7f9efa71e898]
351876.919 4: Xorg (dixLookupDrawable+0x3c) [0x7f9efa6fea9c]
351876.919 5: Xorg (0x7f9efa6a3000+0x52c39) [0x7f9efa6f5c39]
351876.919 6: Xorg (0x7f9efa6a3000+0x573f7) [0x7f9efa6fa3f7]
351876.919 7: Xorg (0x7f9efa6a3000+0x5b596) [0x7f9efa6fe596]
351876.919 8: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7f9ef83b8b45]
351876.919 9: Xorg (0x7f9efa6a3000+0x4590e) [0x7f9efa6e890e]
351876.919
351876.919 Segmentation fault at address 0x0

I've tried the master and the devel branch