I get following panic on 2.6.20-rc4-mm1 on a 2-cpu AMD Opteron system. Same basic config file seems to work with 2.6.20-rc2-mm1 on this same system. Have not tried -rc3-mm1 yet. Attached are config file and "lspci -vv" output. Let me know if you need more info. Suka --- [ 168.925840] Freeing unused kernel memory: 320k freed * INIT: version 2.86 booting * Starting basic networking... [ ok ] * Starting kernel event manager... [ ok ] * Loading hardware drivers... [ ok ] * Starting PCMCIA services... * PCMCIA not present * Loading manual drivers... [ ok ] [ 171.575122] Unable to handle kernel paging request at ffffc20100ec55fc RIP: [ 171.584632] [] e1000_write_vfta_82543+0x58/0xd0 [ 171.614833] PGD 114e067 PUD 0 [ 171.633943] Oops: 0000 [1] PREEMPT SMP [ 171.654614] last sysfs file: /devices/pci0000:00/0000:00:06.0/0000:01:06.0/host0/target0:0:0/0:0:0:0/rev [ 171.698158] CPU 1 [ 171.698161] Modules linked in: [ 171.698164] Pid: 2173, comm: ifconfig Not tainted 2.6.20-rc4-mm1 #1 * Checking root[ 171.698166] RIP: 0010:[] [] e1000_write_vfta_82543+0x58/0xd0 file system...[ 171.698171] RSP: 0018:ffff81007dfc5cf8 EFLAGS: 00010286 [ 171.698174] RAX: ffffc20100ec55fc RBX: ffff81003e4c8948 RCX: 0000000000000000 /dev/shm/root: clean, 662056/2443200 files, 3121107/4883752 bloc[ 171.698176] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff81003e4c8948 ks [ ok ] [ 171.698178] RBP: 0000000000000000 R08: 0000000000000010 R09: 0000000000000000 [ 171.698181] R10: 0000000000000002 R11: ffffffff804a9800 R12: ffffc20000ec0000 [ 171.698183] R13: 00000000fffffffc R14: 0000000000000000 R15: ffff81003e4c8000 * Setting up LVM Volume Groups...[ 171.698186] FS: 00002ab17ce3f6d0(0000) GS:ffff81007f0b0bc0(0000) knlGS:0000000000000000 [ 171.698188] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 171.698191] CR2: ffffc20100ec55fc CR3: 000000007d828000 CR4: 00000000000006e0 [ 171.698194] Process ifconfig (pid: 2173, threadinfo ffff81007dfc4000, task ffff81007dd957e0) [ 171.698196] Stack: 0000000000008000 ffff81003e4c8680 ffffc20000ec0000 ffff81003e4c8000 [ 171.698202] 00007fff2dfba960 ffffffff804c103d ffff81003e4c8680 0000000000000000 [ 171.698205] ffff81003e4c8680 0000000000000000 0000000000000000 ffffffff804c3195 [ 171.698208] Call Trace: [ 171.698216] [] e1000_vlan_rx_register+0x1dd/0x210 [ 171.698219] [] e1000_up+0x35/0x4b0 [ 171.698222] [] e1000_open+0x74/0x100 [ 171.698227] [] dev_open+0x3e/0xa0 [ 171.698230] [] dev_change_flags+0x6f/0x160 [ 171.698234] [] devinet_ioctl+0x2d4/0x6e0 [ 171.698238] [] __up_read+0x21/0xb0 [ 171.698243] [] sock_ioctl+0x1fc/0x230 [ 171.698247] [] do_ioctl+0x2f/0xa0 [ 171.698249] [] vfs_ioctl+0x2bb/0x2f0 [ 171.698252] [] sys_ioctl+0x49/0x80 [ 171.698256] [] error_exit+0x0/0x84 [ 171.698259] [] system_call+0x7e/0x83 [ 171.698261] [ 171.698262] [ 171.698262] Code: 44 8b 20 e8 30 7e 00 00 83 bb 94 01 00 00 03 75 3c 83 e5 01 [ 171.698268] RIP [] e1000_write_vfta_82543+0x58/0xd0 [ 171.698273] RSP [ 171.698274] CR2: ffffc20100ec55fc [ 171.698276] <6>EXT3 FS on sda1, internal journal