Hi, My machine reboots automatically after a few seconds of booting 2.6.23-rc2-mm2. I've tried several ways to debug the problem, but I've had no success. I am not sure if this problem has been reported already, a few simple searches did not indicate that the problem had been reported 2.6.23-rc1-mm1 did not have this problem. .config is attached with this email. /proc/cpuinfo shows processor : 0 cpu : POWER5 (gr) clock : 1654.344000MHz revision : 2.3 (pvr 003a 0203) processor : 1 cpu : POWER5 (gr) clock : 1654.344000MHz revision : 2.3 (pvr 003a 0203) processor : 2 cpu : POWER5 (gr) clock : 1654.344000MHz revision : 2.3 (pvr 003a 0203) processor : 3 cpu : POWER5 (gr) clock : 1654.344000MHz revision : 2.3 (pvr 003a 0203) timebase : 206998000 machine : CHRP IBM,9123-710 lspci shows 00:02.0 PCI bridge: IBM EADS-X PCI-X to PCI-X Bridge (rev 03) 00:02.2 PCI bridge: IBM EADS-X PCI-X to PCI-X Bridge (rev 03) 00:02.3 PCI bridge: IBM EADS-X PCI-X to PCI-X Bridge (rev 03) 00:02.4 PCI bridge: IBM EADS-X PCI-X to PCI-X Bridge (rev 03) c0:01.0 Ethernet controller: Intel Corporation 82546EB Gigabit Ethernet Controller (Copper) (rev 01) c0:01.1 Ethernet controller: Intel Corporation 82546EB Gigabit Ethernet Controller (Copper) (rev 01) c8:01.0 USB Controller: NEC Corporation USB (rev 43) c8:01.1 USB Controller: NEC Corporation USB (rev 43) c8:01.2 USB Controller: NEC Corporation USB 2.0 (rev 04) cc:01.0 Mass storage controller: Promise Technology, Inc. 20275 (rev 01) d0:01.0 SCSI storage controller: Mylex Corporation AcceleRAID 600/500/400/Sapphire support Device (rev 04) 0001:00:02.2 PCI bridge: IBM EADS-X PCI-X to PCI-X Bridge (rev 03) 0001:00:02.4 PCI bridge: IBM EADS-X PCI-X to PCI-X Bridge (rev 03) 0001:00:02.6 PCI bridge: IBM EADS-X PCI-X to PCI-X Bridge (rev 03) 0001:d0:01.0 Ethernet controller: Intel Corporation 82545GM Gigabit Ethernet Controller (rev 04) Normal kernel boot (memory info) EEH: PCI Enhanced I/O Error Handling Enabled PPC64 nvram contains 7168 bytes Using dedicated idle loop Top of RAM: 0xe9000000, Total RAM: 0xe9000000 Memory hole size: 0MB On node 0 totalpages: 954368 DMA zone: 954368 pages, LIFO batch:31 DMA32 zone: 0 pages, LIFO batch:0 Normal zone: 0 pages, LIFO batch:0 HighMem zone: 0 pages, LIFO batch:0 [boot]0015 Setup Done Built 1 zonelists -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL