If I get comment #2 right, the spice issue has been fixed sometime between v2.0 and v2.5, so I'm closing this ticket now. If you still encounter this issue with the latest version of QEMU (currently v4.0), feel free to open again (or report a new bug ticket for other issues).
** Changed in: qemu Status: New => Fix Released -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1548170 Title: qemu-kvm-spice spice server locks up when large user image is set Status in QEMU: Fix Released Bug description: QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.22), Copyright (c) 2003-2008 Fabrice Bellard I have QEMU kvm spice installed, running a Windows 10 1511, freshly installed this morning, using VirtIO root volume, Ethernet, and QXL graphics through Spice. It successfully installed the latest updates, and installed Visual Studio 2010 Professional plus Service Pack 1 and updates. Upon attempting to configure the following PNG as my account's user picture in the Settings control panel applet: https://static.kode54.net/pwywcomm_christopher_8bpp.png It added successfully, but then I noticed that Windows does not support alpha blended user pictures, and it blended it against white, so I quickly replaced it with the following: https://static.kode54.net/pwywcomm_christopher_blended.png Upon assigning that, with the other one still in the previous image buttons, Spice locked up completely. The VM was still running, as evidenced by a successful Remote Desktop session. Do I need to replace my entire Qemu setup with a Git or hand built official version to verify that this isn't Ubuntu's fault? To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1548170/+subscriptions