Hello, I just launched a couple of guests and tried running iperf. The network is working fine with static IPs. I can ping between all machines. However, this is what happens when I start iperf with simply "iperf -c Ipaddress" Can someone shed some light on this Thanks - Pak Unable to handle kernel NULL pointer dereference at virtual address 000000c9 printing eip: c02398cb 0f9bc000 -> *pde = 00000001:96d86001 0d676000 -> *pme = 00000000:00000000 Oops: 0002 [#1] SMP Modules linked in: CPU: 0 EIP: 0061:[<c02398cb>] Not tainted VLI EFLAGS: 00010096 (2.6.12.6-xenU) EIP is at network_tx_buf_gc+0xd9/0x253 eax: 0000002e ebx: 00000019 ecx: c0600aec edx: 00000000 esi: 00000045 edi: c0600220 ebp: 0004024c esp: c04d1cd0 ds: 007b es: 007b ss: 0069 Process iperf (pid: 1480, threadinfo=c04d0000 task=cd668a20) Stack: c0600aec 00000000 c04d0000 00040253 c0600000 00000000 c06002ac c0600220 c0600000 c023a118 c0600000 c05d2cc0 00000000 c04d1d84 00000107 c013c1f0 00000107 c0600000 c04d1d84 00000000 c031b780 00000107 00008380 c031b79c Call Trace: [<c023a118>] netif_int+0x28/0x117 [<c013c1f0>] handle_IRQ_event+0x61/0xa5 [<c013c2f9>] __do_IRQ+0xc5/0x11c [<c010d928>] do_IRQ+0x1d/0x28 [<c0104925>] evtchn_do_upcall+0x87/0xeb [<c0109738>] hypervisor_callback+0x2c/0x34 [<c0210d38>] __copy_from_user_ll+0x35/0x9e [<c0210e59>] copy_from_user+0x3d/0xa4 [<c0106992>] alloc_skb+0x52/0xaa [<c025f43f>] tcp_sendmsg+0x238/0xff9 [<c023bd7d>] sock_aio_write+0xf6/0x108 [<c015fcaa>] do_sync_write+0xbe/0x102 [<c0123c45>] do_softirq+0x60/0x69 [<c0133b27>] autoremove_wake_function+0x0/0x4b [<c010b4a3>] do_gettimeofday+0x56/0x250 [<c015fd8e>] vfs_write+0xa0/0x129 [<c015fed6>] sys_write+0x4b/0x74 [<c0109551>] syscall_call+0x7/0xb Code: cc 08 00 00 89 04 24 e8 1d ce ec ff 8b 87 c4 00 00 00 89 84 9f c4 00 00 00 c7 84 9f d0 08 00 00 00 00 00 00 89 9f c4 00 00 00 90 <ff> 8e 84 00 00 00 0f 94 c0 84 c0 0f 84 60 ff ff ff 8b 4c 24 08 <0>Kernel panic - not syncing: Fatal exception in interrupt _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel