Hello, I try to run FC5 guest on dom0 kernel-xen0-2.6.16-1.2122_FC5smp. FC5 Guest boot's up without any problem only with single core kernel. If I do something like "yum update" or bonnie++ on this guest I get always the same "CPU0 FATAL TRAP 6". On version kernel-xen0-2.6.16-1.2096_FC5 I can not start a FC5 guest -> guest stops with boot up. With kernel-xen0-2.6.16-1.2096_FC5 I can run rhel4, rh72 guests stable (not smp). Message on remote logserver: (XEN) HVM_PIT: guest freq in cycles=2999809 (XEN) Assertion '(sp == 0) || (pending_eoi[cpu][sp-1].vector < vector)' failed, line 189, file irq.c (XEN) BUG at irq.c:189 (XEN) (file=extable.c, line=77) Pre-exception: ff13173f -> 00000000 (XEN) ----[ Xen-3.0.2-2 Not tainted ]---- (XEN) CPU: 0 (XEN) EIP: e008:[<ff13173f>] __do_IRQ_guest+0x192/0x2af (XEN) EFLAGS: 00010086 CONTEXT: hypervisor (XEN) eax: ff1a7138 ebx: ff117d4b ecx: 00004001 edx: 00005535 (XEN) esi: c040b520 edi: 0000000a ebp: ff1b9eac esp: ff1b9e74 (XEN) cr0: 8005003b cr3: 58493000 (XEN) ds: e010 es: e010 fs: e010 gs: e010 ss: e010 cs: e008 (XEN) Xen stack trace from esp=ff1b9e74: (XEN) ff197519 ff197527 000000bd ff197527 ffbfee80 00000002 00000013 ff1d2d00 (XEN) ffbb5280 ff1e57a0 ff1b9ecc 00000001 00000000 ff117d4b ff1b9edc ff131250 (XEN) 000000b0 00000000 ff1b9edc ff11cfb0 ff1c3684 ff1c1110 000000b0 ff1d2d00 (XEN) ff1c3680 ff117d4b 00e46103 ff12cdd5 ff1b9ee8 ff117d4b 00000003 ffbbb204 (XEN) c040b520 0000000a ff1b9f7c 00000000 00b00000 ff11b6b1 0000e008 00000246 (XEN) ff1c1100 ffbbb204 5db0a035 00000143 ffb1c080 00000020 00000007 ff11af3f (XEN) ffbbb194 ff1bfe84 00000001 00000001 5dcb73f9 00000143 ffbbb180 0007a120 (XEN) 00000000 ffb1c080 ffbbb180 00000000 5db0a035 00000143 ffb31788 0007a120 (XEN) 00000000 ffb1c080 ff1b9fac ff11bb79 00000001 ff1c2500 00e46037 ff1b9fb4 (XEN) ff1b9fac ff17e171 00000002 00000001 00000000 00000002 00000000 ff17e376 (XEN) 00000002 00000000 c03b9000 c040b520 0000000a 00000000 c03e6000 00880000 (XEN) 000000f9 00fb0000 00000000 0000e008 00000202 0000007b 0000007b 00000000 (XEN) 00000000 00000000 ffb1c080 (XEN) Xen call trace: (XEN) [<ff13173f>] __do_IRQ_guest+0x192/0x2af (XEN) [<ff131250>] do_IRQ+0x58/0x18e (XEN) [<ff12cdd5>] common_interrupt+0x45/0x50 (XEN) [<ff11b6b1>] __enter_scheduler+0x3d8/0x48c (XEN) [<ff11bb79>] do_softirq+0xa1/0xb8 (XEN) (XEN) ************************************ (XEN) CPU0 FATAL TRAP 6 (invalid opcode), ERROR_CODE 0000, IN INTERRUPT CONTEXT. (XEN) System shutting down -- need manual reset. (XEN) ************************************ What can i do ? Has anybody see the same problem ? regards, Thomas