kernel panic when trying to boot Fedora 10 live in VirtualBox

[Phill]

Downloaded live fedora 10 alpha kde, but can't get it to boot in VirtualBox. Any help appreciated.

Call Trace:
 [<c044a252>] ? trace_hardirqs_on+0xb/0xd
 [<c04a6364>] ? d_callback+0x29/0x2c
 [<c04a6364>] ? d_callback+0x29/0x2c
 [<c046a4a6>] ? __rcu_process_callbacks+0x185/0x1f4
 [<c046a534>] ? rcu_process_callbacks+0x1f/0x38
 [<c0431602>] ? __do_softirq+0x89/0x10f
 [<c0431579>] ? __do_softirq+0x0/0x10f
 [<c0405fd2>] ? do_softirq+0x7c/0xde
 [<c043123c>] ? irq_exit+0x49/0x88
 [<c04147ad>] ? smp_apic_timer_interrupt+0x73/0x81
 [<c0404705>] ? apic_timer_interrupt+0x2d/0x34
 [<c044a252>] ? trace_hardirqs_on+0xb/0xd
 [<c045ed38>] ? do_stop+0x14c/0x194
 [<c045ebec>] ? do_stop+0x0/0x194
 [<c043dd76>] ? kthread+0x40/0x66
 [<c043dd36>] ? kthread+0x0/0x66
 [<c04048a3>] ? kernel_thread_helper+0x7/0x10
 =======================
Code: f0 00 02 00 00 75 14 8b 45 f0 50 9d 0f 1f 84 00 00 00 00 00 e8 2b 4b               fb ff eb 12 e8 6d 58 fb ff 8b 45 f0 50 9d 0f 1f 84 00 00 00 <00> 00 8d 65 f4 5b 5e 5f 5d c3 55 89 e5 53 e8 b4 fe f6 ff 89 c2
EIP: [<c04949e5>] kmem_cache_free+0xc3/0xcd SS:ESP 0068:c0874f8c
Kernel panic - not syncing: Fatal exception in interrupt