(gdb) thread apply all bt

Thread 3 (Thread 0x7f0f2cd2d700 (LWP 18129)):
#0  0x00007f0f3721f343 in poll () from /lib64/libc.so.6
#1  0x00007f0f379b52d4 in ?? () from /usr/lib64/libspice-server.so.1
#2  0x00007f0f39c279d1 in start_thread () from /lib64/libpthread.so.0
#3  0x00007f0f37228b6d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f0f3055f700 (LWP 18127)):
#0  0x00007f0f37220b37 in ioctl () from /lib64/libc.so.6
#1  0x00007f0f3a31cf1a in kvm_run (env=0x7f0f3ba97f30) at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-kvm.c:1015
#2  0x00007f0f3a31d3d9 in kvm_cpu_exec (env=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-kvm.c:1744
#3  0x00007f0f3a31e2bd in kvm_main_loop_cpu (_env=0x7f0f3ba97f30) at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-kvm.c:2005
#4  ap_main_loop (_env=0x7f0f3ba97f30) at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-kvm.c:2061
#5  0x00007f0f39c279d1 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f0f37228b6d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f0f3a23e980 (LWP 18101)):
#0  0x00007f0f37172925 in raise () from /lib64/libc.so.6
#1  0x00007f0f37174105 in abort () from /lib64/libc.so.6
#2  0x00007f0f3716ba4e in __assert_fail_base () from /lib64/libc.so.6
#3  0x00007f0f3716bb10 in __assert_fail () from /lib64/libc.so.6
#4  0x00007f0f3a38280f in io_watch_poll_finalize (source=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-char.c:630
#5  0x00007f0f3974f781 in ?? () from /lib64/libglib-2.0.so.0
#6  0x00007f0f3974fb15 in ?? () from /lib64/libglib-2.0.so.0
#7  0x00007f0f3975241e in g_source_remove () from /lib64/libglib-2.0.so.0
#8  0x00007f0f3a385c0d in pty_chr_rearm_timer (chr=0x7f0f3ba6ac00, connected=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-char.c:1042
#9  pty_chr_state (chr=0x7f0f3ba6ac00, connected=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-char.c:1131
#10 0x00007f0f3a385c7a in pty_chr_update_read_handler (chr=0x7f0f3ba6ac00) at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-char.c:1115
#11 0x00007f0f3a385cd5 in pty_chr_write (chr=<value optimized out>, buf=<value optimized out>, len=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-char.c:1059
#12 0x00007f0f3a4544b4 in flush_buf (port=<value optimized out>, buf=0x7f0f258cf7c0 "", len=121) at /usr/src/debug/qemu-kvm-0.12.1.2/hw/virtio-console.c:58
#13 0x00007f0f3a31233c in do_flush_queued_data (port=0x7f0f3bffd100, vq=0x7f0f3bfdf4d0, vdev=0x7f0f3bae3ed0) at /usr/src/debug/qemu-kvm-0.12.1.2/hw/virtio-serial-bus.c:193
#14 0x00007f0f3a330011 in qemu_bh_poll () at /usr/src/debug/qemu-kvm-0.12.1.2/async.c:70
#15 0x00007f0f3a2f8659 in main_loop_wait (timeout=1000) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:4096
#16 0x00007f0f3a31b45a in kvm_main_loop () at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-kvm.c:2245
#17 0x00007f0f3a2fb2d9 in main_loop (argc=56, argv=<value optimized out>, envp=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:4266
#18 main (argc=56, argv=<value optimized out>, envp=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:6644
(gdb) thread 1
[Switching to thread 1 (Thread 0x7f0f3a23e980 (LWP 18101))]#0  0x00007f0f37172925 in raise () from /lib64/libc.so.6
(gdb) frame 4
#4  0x00007f0f3a38280f in io_watch_poll_finalize (source=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-char.c:630
630	    assert(iwp->src == NULL);