For error I started the uniprocessor kernel on a dual MP 2200+ system and I noticed that the uniprocessor 2.6.15-1.2009.4.2_FC5 kernel hangs up. The smp one is ok instead. Tried two times with same result. The message is: BUG: soft lockup detected on cpu#0! PID:0, comm: swapper EIP: 0060 [<c01394fe>] CPU: 0 EIP is at handle_irq_event+0x17/0x4c -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list