Hi, I'm running 8.04 LTS server, kernel 2.6.24-16-server, on a Dell tower with 3G of RAM. I'm using it as a backup server and it has a 3 disk software RAID array (mdadm). The OS is on a separate 4th disk. While running a python script which calls rsync (the python script runs from the crontab), after a while the system crashes via "kernel oops". I've copied and pasted the /var/log/kern.log and /var/log/messages below. I ran memtest for 24 hours and it showed no errors. I also ran smartctl on all disks and they all report "PASSED". Any help would be greatly appreciated here. OUTPUT OF /var/log/kern.log: Nov 4 11:27:50 octo4 kernel: [72210.491421] Unable to handle kernel NULL pointer dereference at 0000000000000070 RIP: Nov 4 11:27:50 octo4 kernel: [72210.491432] [] _spin_lock+0x0/0x10 Nov 4 11:27:50 octo4 kernel: [72210.491482] PGD 0 Nov 4 11:27:50 octo4 kernel: [72210.491499] Oops: 0002 [1] SMP Nov 4 11:27:50 octo4 kernel: [72210.491518] CPU 1 Nov 4 11:27:50 octo4 kernel: [72210.491534] Modules linked in: nfs lockd nfs_acl sunrpc autofs4 iptable_filter ip_tables x_tables ipv6 parport_pc lp parport loop af_packet serio_raw bu tton psmouse snd_hda_intel snd_pcm snd_timer snd_page_alloc snd_hwdep snd dcdbas evdev soundcore intel_agp shpchp pci_hotplug iTCO_wdt iTCO_vendor_support pcspkr ext3 jbd mbcache sg sr_ mod cdrom sd_mod ata_generic 8139too pata_acpi 8139cp mii ata_piix libata scsi_mod ehci_hcd uhci_hcd e1000 usbcore raid10 raid456 async_xor async_memcpy async_tx xor raid1 raid0 multipa th linear md_mod thermal processor fan fbcon tileblit font bitblit softcursor fuse Nov 4 11:27:50 octo4 kernel: [72210.491813] Pid: 171, comm: kswapd0 Not tainted 2.6.24-16-server #1 Nov 4 11:27:50 octo4 kernel: [72210.491833] RIP: 0010:[] [] _spin_lock+0x0/0x10 Nov 4 11:27:50 octo4 kernel: [72210.491865] RSP: 0018:ffff8100b95f5d48 EFLAGS: 00010202 Nov 4 11:27:50 octo4 kernel: [72210.491884] RAX: 0000000000000001 RBX: ffff8100167d23c8 RCX: 0000000000000000 Nov 4 11:27:50 octo4 kernel: [72210.491905] RDX: 0000000000000001 RSI: 00000000000000d0 RDI: 0000000000000070 Nov 4 11:27:50 octo4 kernel: [72210.491926] RBP: ffff8100167d2550 R08: 0000000000000000 R09: 0000000000000000 Nov 4 11:27:50 octo4 kernel: [72210.491947] R10: ffff81000102cc60 R11: ffffffff802caa70 R12: 000000000000004e Nov 4 11:27:50 octo4 kernel: [72210.491967] R13: ffff8100167d24d8 R14: 0000000000000000 R15: 0000000000000000 Nov 4 11:27:50 octo4 kernel: [72210.491989] FS: 0000000000000000(0000) GS:ffff8100bd001700(0000) knlGS:0000000000000000Nov 4 11:27:50 octo4 kernel: [72210.492020] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b Nov 4 11:27:50 octo4 kernel: [72210.492039] CR2: 0000000000000070 CR3: 00000000b29e2000 CR4: 00000000000006e0 Nov 4 11:27:50 octo4 kernel: [72210.492060] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Nov 4 11:27:50 octo4 kernel: [72210.492081] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Nov 4 11:27:50 octo4 kernel: [72210.492103] Process kswapd0 (pid: 171, threadinfo ffff8100b95f4000, task ffff8100b95ee7e0) Nov 4 11:27:50 octo4 kernel: [72210.492135] Stack: ffffffff802dc5b2 ffff8100167d23c8 0000000000000080 000000000000004e Nov 4 11:27:50 octo4 kernel: [72210.492178] ffff8100b95f5d80 000000000000004e ffffffff802cb244 ffff8100167d20d8 Nov 4 11:27:50 octo4 kernel: [72210.492216] ffff8100167249d8 000000000016d104 00000000000cca38 000000000000017b Nov 4 11:27:50 octo4 kernel: [72210.492241] Call Trace: Nov 4 11:27:50 octo4 kernel: [72210.492270] [remove_inode_buffers+0x42/0x100] remove_inode_buffers+0x42/0x100 Nov 4 11:27:50 octo4 kernel: [72210.492294] [shrink_icache_memory+0x1f4/0x2a0] shrink_icache_memory+0x1f4/0x2a0 Nov 4 11:27:50 octo4 kernel: [72210.492318] [shrink_slab+0x124/0x180] shrink_slab+0x124/0x180 Nov 4 11:27:50 octo4 kernel: [72210.492340] [kswapd+0x391/0x560] kswapd+0x391/0x560 Nov 4 11:27:50 octo4 kernel: [72210.492364] [] autoremove_wake_function+0x0/0x30 Nov 4 11:27:50 octo4 kernel: [72210.492388] [kswapd+0x0/0x560] kswapd+0x0/0x560 Nov 4 11:27:50 octo4 kernel: [72210.492407] [kthread+0x4b/0x80] kthread+0x4b/0x80 Nov 4 11:27:50 octo4 kernel: [72210.492428] [child_rip+0xa/0x12] child_rip+0xa/0x12 Nov 4 11:27:50 octo4 kernel: [72210.492453] [kthread+0x0/0x80] kthread+0x0/0x80 Nov 4 11:27:50 octo4 kernel: [72210.492472] [child_rip+0x0/0x12] child_rip+0x0/0x12 Nov 4 11:27:50 octo4 kernel: [72210.492491] Nov 4 11:27:50 octo4 kernel: [72210.492504] Nov 4 11:27:50 octo4 kernel: [72210.492505] Code: f0 ff 0f 79 09 f3 90 83 3f 00 7e f9 eb f2 c3 90 f0 81 2f 00 Nov 4 11:27:50 octo4 kernel: [72210.492591] RIP [] _spin_lock+0x0/0x10 Nov 4 11:27:50 octo4 kernel: [72210.492612] RSP Nov 4 11:27:50 octo4 kernel: [72210.492630] CR2: 0000000000000070 Nov 4 11:27:50 octo4 kernel: [72210.492892] ---[ end trace 51aa3f03002ca8af ]--- OUTPUT OF /var/log/messages Nov 4 11:27:50 octo4 kernel: [72210.491482] PGD 0 Nov 4 11:27:50 octo4 kernel: [72210.491518] CPU 1 Nov 4 11:27:50 octo4 kernel: [72210.491534] Modules linked in: nfs lockd nfs_acl sunrpc autofs4 iptable_filter ip_tables x_tables ipv6 parport_pc lp parport loop af_packet serio_raw button psmouse snd_hda_intel snd_pcm snd_timer snd_page_alloc snd_hwdep snd dcdbas evdev soundcore intel_agp shpchp pci_hotplug iTCO_wdt iTCO_vendor_support pcspkr ext3 jbd mbcache sg sr_mod cdrom sd_mod ata_generic 8139too pata_acpi 8139cp mii ata_piix libata scsi_mod ehci_hcd uhci_hcd e1000 usbcore raid10 raid456 async_xor async_memcpy async_tx xor raid1 raid0 multipath linear md_mod thermal processor fan fbcon tileblit font bitblit softcursor fuse Nov 4 11:27:50 octo4 kernel: [72210.491813] Pid: 171, comm: kswapd0 Not tainted 2.6.24-16-server #1 Nov 4 11:27:50 octo4 kernel: [72210.491833] RIP: 0010:[] [] _spin_lock+0x0/0x10 Nov 4 11:27:50 octo4 kernel: [72210.491865] RSP: 0018:ffff8100b95f5d48 EFLAGS: 00010202 Nov 4 11:27:50 octo4 kernel: [72210.491884] RAX: 0000000000000001 RBX: ffff8100167d23c8 RCX: 0000000000000000 Nov 4 11:27:50 octo4 kernel: [72210.491905] RDX: 0000000000000001 RSI: 00000000000000d0 RDI: 0000000000000070 Nov 4 11:27:50 octo4 kernel: [72210.491926] RBP: ffff8100167d2550 R08: 0000000000000000 R09: 0000000000000000 Nov 4 11:27:50 octo4 kernel: [72210.491947] R10: ffff81000102cc60 R11: ffffffff802caa70 R12: 000000000000004e Nov 4 11:27:50 octo4 kernel: [72210.491967] R13: ffff8100167d24d8 R14: 0000000000000000 R15: 0000000000000000 Nov 4 11:27:50 octo4 kernel: [72210.491989] FS: 0000000000000000(0000) GS:ffff8100bd001700(0000) knlGS:0000000000000000 Nov 4 11:27:50 octo4 kernel: [72210.492020] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b Nov 4 11:27:50 octo4 kernel: [72210.492039] CR2: 0000000000000070 CR3: 00000000b29e2000 CR4: 00000000000006e0 Nov 4 11:27:50 octo4 kernel: [72210.492060] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Nov 4 11:27:50 octo4 kernel: [72210.492081] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Nov 4 11:27:50 octo4 kernel: [72210.492103] Process kswapd0 (pid: 171, threadinfo ffff8100b95f4000, task ffff8100b95ee7e0) Nov 4 11:27:50 octo4 kernel: [72210.492135] Stack: ffffffff802dc5b2 ffff8100167d23c8 0000000000000080 000000000000004e Nov 4 11:27:50 octo4 kernel: [72210.492178] ffff8100b95f5d80 000000000000004e ffffffff802cb244 ffff8100167d20d8 Nov 4 11:27:50 octo4 kernel: [72210.492216] ffff8100167249d8 000000000016d104 00000000000cca38 000000000000017b Nov 4 11:27:50 octo4 kernel: [72210.492241] Call Trace: Nov 4 11:27:50 octo4 kernel: [72210.492270] [remove_inode_buffers+0x42/0x100] remove_inode_buffers+0x42/0x100 Nov 4 11:27:50 octo4 kernel: [72210.492294] [shrink_icache_memory+0x1f4/0x2a0] shrink_icache_memory+0x1f4/0x2a0 Nov 4 11:27:50 octo4 kernel: [72210.492318] [shrink_slab+0x124/0x180] shrink_slab+0x124/0x180 Nov 4 11:27:50 octo4 kernel: [72210.492340] [kswapd+0x391/0x560] kswapd+0x391/0x560 Nov 4 11:27:50 octo4 kernel: [72210.492364] [] autoremove_wake_function+0x0/0x30 Nov 4 11:27:50 octo4 kernel: [72210.492388] [kswapd+0x0/0x560] kswapd+0x0/0x560 Nov 4 11:27:50 octo4 kernel: [72210.492407] [kthread+0x4b/0x80] kthread+0x4b/0x80 Nov 4 11:27:50 octo4 kernel: [72210.492428] [child_rip+0xa/0x12] child_rip+0xa/0x12 Nov 4 11:27:50 octo4 kernel: [72210.492453] [kthread+0x0/0x80] kthread+0x0/0x80 Nov 4 11:27:50 octo4 kernel: [72210.492472] [child_rip+0x0/0x12] child_rip+0x0/0x12 Nov 4 11:27:50 octo4 kernel: [72210.492491] Nov 4 11:27:50 octo4 kernel: [72210.492504] Nov 4 11:27:50 octo4 kernel: [72210.492505] Code: f0 ff 0f 79 09 f3 90 83 3f 00 7e f9 eb f2 c3 90 f0 81 2f 00 Nov 4 11:27:50 octo4 kernel: [72210.492612] RSP Nov 4 11:27:50 octo4 kernel: [72210.492892] ---[ end trace 51aa3f03002ca8af ]---

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