f7t3 after install reboots on qemu but not on qemu-kvm

["Gianluca Cecchi" <gianluca cecchi gmail com>]

Installed f7t3 x86 under qemu-kvm (host has kvm-12 under latest kernel
of fc6 x86_64).
At reboot if I start with qemu-kvm, I get
BUG: soft lockup detected on CPU#0!
[<c04061d9>] show_trace_log_lvl+0x1a/0x2f
Instead I can start with qemu without problems.

Tried with and without  -no-acpi option and with single or multicpu
(installation was with one).
and same problem
Any hint? Qemu without kvm is very slow.....

Does it make sense to file a bug?

Thanks in advance,
Gianluca