I've just experienced a lockup which completely tied up the machine for a considerable period. I don't know exactly how long.

When I came back to the machine, my Ctrl-Alt-F1 had taken effect. I switched back to the GUI (KDE 3.5) everything was back to normal.

From /var/log/messages, below, there seem to be a lot of problems with the system. gnome-keyring-daemon is implicated. this is associated, I think, with evolution.

/var/log/messages contains

Aug 27 13:11:10 linux-js4w syslog-ng[1893]: STATS: dropped 0
Aug 27 14:03:55 linux-js4w gnome-keyring-daemon[5070]: couldn't read 4 bytes from client:
Aug 27 14:04:28 linux-js4w syslog-ng[1893]: last message repeated 15452 times
Aug 27 14:04:28 linux-js4w gnome-keyring-daemon[5070]: couldn't read 4 bytes from client:
Aug 27 14:05:28 linux-js4w syslog-ng[1893]: last message repeated 53558 times
Aug 27 14:05:28 linux-js4w gnome-keyring-daemon[5070]: couldn't read 4 bytes from client:
Aug 27 14:06:28 linux-js4w syslog-ng[1893]: last message repeated 60356 times
Aug 27 14:06:28 linux-js4w gnome-keyring-daemon[5070]: couldn't read 4 bytes from client:
Aug 27 14:07:28 linux-js4w syslog-ng[1893]: last message repeated 56511 times
Aug 27 14:07:28 linux-js4w gnome-keyring-daemon[5070]: couldn't read 4 bytes from client:
Aug 27 14:08:28 linux-js4w syslog-ng[1893]: last message repeated 58789 times
Aug 27 14:08:28 linux-js4w gnome-keyring-daemon[5070]: couldn't read 4 bytes from client:
Aug 27 14:09:28 linux-js4w syslog-ng[1893]: last message repeated 57681 times
Aug 27 14:09:28 linux-js4w gnome-keyring-daemon[5070]: couldn't read 4 bytes from client:
Aug 27 14:10:28 linux-js4w syslog-ng[1893]: last message repeated 53506 times
Aug 27 14:10:28 linux-js4w gnome-keyring-daemon[5070]: couldn't read 4 bytes from client:
Aug 27 14:11:10 linux-js4w syslog-ng[1893]: last message repeated 41307 times
Aug 27 14:11:10 linux-js4w syslog-ng[1893]: STATS: dropped 0
Aug 27 14:11:10 linux-js4w gnome-keyring-daemon[5070]: couldn't read 4 bytes from client:
Aug 27 14:11:28 linux-js4w syslog-ng[1893]: last message repeated 14590 times
Aug 27 14:11:28 linux-js4w gnome-keyring-daemon[5070]: couldn't read 4 bytes from client:
Aug 27 14:12:28 linux-js4w syslog-ng[1893]: last message repeated 2715 times
Aug 27 14:44:34 linux-js4w kernel: klipper invoked oom-killer: gfp_mask=0x1201d2, order=0, oomkilladj=0
Aug 27 14:44:34 linux-js4w kernel: Pid: 4953, comm: klipper Tainted: P N 2.6.25.11-0.1-default #1
Aug 27 14:44:34 linux-js4w kernel:
Aug 27 14:44:34 linux-js4w kernel: Call Trace:
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff8020d696>] dump_trace+0xc4/0x576
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff8020db88>] show_trace+0x40/0x57
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff8044f8d5>] _etext+0x72/0x7b
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff80276e12>] oom_kill_process+0x5d/0x1f8
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff8027737e>] out_of_memory+0x1ea/0x224
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff8027a6e8>] __alloc_pages+0x2be/0x392
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff8029517f>] alloc_pages_current+0xd1/0xd6
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff80273be2>] __page_cache_alloc+0xb/0xd
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff8027bfe5>] __do_page_cache_readahead+0x88/0x180
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff8027c130>] do_page_cache_readahead+0x53/0x60
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff80274d91>] filemap_fault+0x15e/0x2f7
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff802822e3>] __do_fault+0x6b/0x417
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff80284312>] handle_mm_fault+0x466/0x940
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff8044b992>] do_page_fault+0x676/0xabf
Aug 27 14:44:34 linux-js4w kernel: [<ffffffff804496b9>] error_exit+0x0/0x60
Aug 27 14:44:34 linux-js4w kernel: DWARF2 unwinder stuck at error_exit+0x0/0x60
Aug 27 14:44:34 linux-js4w kernel:
Aug 27 14:44:34 linux-js4w kernel: Leftover inexact backtrace:
Aug 27 14:44:34 linux-js4w kernel:
Aug 27 14:44:34 linux-js4w kernel:
Aug 27 14:44:36 linux-js4w kernel: Mem-info:
Aug 27 14:44:36 linux-js4w kernel: Node 0 DMA per-cpu:
Aug 27 14:44:36 linux-js4w kernel: CPU 0: hi: 0, btch: 1 usd: 0
Aug 27 14:44:36 linux-js4w kernel: CPU 1: hi: 0, btch: 1 usd: 0
Aug 27 14:44:36 linux-js4w kernel: Node 0 DMA32 per-cpu:
Aug 27 14:44:36 linux-js4w kernel: CPU 0: hi: 186, btch: 31 usd: 175
Aug 27 14:44:36 linux-js4w kernel: CPU 1: hi: 186, btch: 31 usd: 175
Aug 27 14:44:36 linux-js4w kernel: Node 0 Normal per-cpu:
Aug 27 14:44:36 linux-js4w kernel: CPU 0: hi: 186, btch: 31 usd: 177
Aug 27 14:44:36 linux-js4w kernel: CPU 1: hi: 186, btch: 31 usd: 177
Aug 27 14:44:36 linux-js4w kernel: Active:416603 inactive:526245 dirty:6 writeback:0 unstable:0
Aug 27 14:44:36 linux-js4w kernel: free:4819 slab:13502 mapped:46 pagetables:7203 bounce:0
Aug 27 14:44:36 linux-js4w kernel: Node 0 DMA free:9380kB min:16kB low:20kB high:24kB active:0kB inactive:0kB present:8848kB pages_scanned:0 all_unreclaimable? yes
Aug 27 14:44:38 linux-js4w kernel: lowmem_reserve[]: 0 3495 4000 4000
Aug 27 14:44:38 linux-js4w kernel: Node 0 DMA32 free:8976kB min:7064kB low:8828kB high:10596kB active:1546408kB inactive:1794396kB present:3579876kB pages_scanned:18720562 all_unreclaimable? yes
Aug 27 14:44:38 linux-js4w kernel: lowmem_reserve[]: 0 0 505 505
Aug 27 14:44:38 linux-js4w kernel: Node 0 Normal free:920kB min:1020kB low:1272kB high:1528kB active:120004kB inactive:310584kB present:517120kB pages_scanned:1996077 all_unreclaimable? yes
Aug 27 14:44:38 linux-js4w kernel: lowmem_reserve[]: 0 0 0 0
Aug 27 14:44:38 linux-js4w kernel: Node 0 DMA: 1*4kB 6*8kB 3*16kB 6*32kB 4*64kB 3*128kB 3*256kB 1*512kB 3*1024kB 2*2048kB 0*4096kB = 9380kB
Aug 27 14:44:38 linux-js4w kernel: Node 0 DMA32: 24*4kB 0*8kB 3*16kB 0*32kB 2*64kB 0*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB 2*4096kB = 8976kB
Aug 27 14:44:38 linux-js4w kernel: Node 0 Normal: 14*4kB 4*8kB 14*16kB 9*32kB 5*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 920kB
Aug 27 14:44:38 linux-js4w kernel: 93744 total pagecache pages
Aug 27 14:44:38 linux-js4w kernel: Swap cache: add 966560, delete 966560, find 152298/187822
Aug 27 14:44:38 linux-js4w kernel: Free swap = 0kB
Aug 27 14:44:38 linux-js4w kernel: Total swap = 2096440kB
Aug 27 14:44:40 linux-js4w kernel: Free swap: 0kB
Aug 27 14:44:40 linux-js4w kernel: 1048576 pages of RAM
Aug 27 14:44:40 linux-js4w kernel: 37489 reserved pages
Aug 27 14:44:40 linux-js4w kernel: 95126 pages shared
Aug 27 14:44:40 linux-js4w kernel: 0 pages swap cached
Aug 27 14:44:40 linux-js4w kernel: Out of memory: kill process 546 (bash) score 1981580 or a child
Aug 27 14:44:40 linux-js4w kernel: Killed process 637 (java)
Aug 27 15:06:36 linux-js4w kernel: CPU0 attaching NULL sched-domain.
Aug 27 15:06:36 linux-js4w kernel: CPU1 attaching NULL sched-domain.
Aug 27 15:06:36 linux-js4w kernel: CPU0 attaching sched-domain:
Aug 27 15:06:36 linux-js4w kernel: domain 0: span 00000000,00000000,00000000,00000003
Aug 27 15:06:36 linux-js4w kernel: groups: 00000000,00000000,00000000,00000001 00000000,00000000,00000000,00000002
Aug 27 15:06:36 linux-js4w kernel: domain 1: span 00000000,00000000,00000000,00000003
Aug 27 15:06:36 linux-js4w kernel: groups: 00000000,00000000,00000000,00000003
Aug 27 15:06:36 linux-js4w kernel: CPU1 attaching sched-domain:
Aug 27 15:06:36 linux-js4w kernel: domain 0: span 00000000,00000000,00000000,00000003
Aug 27 15:06:36 linux-js4w kernel: groups: 00000000,00000000,00000000,00000002 00000000,00000000,00000000,00000001
Aug 27 15:06:36 linux-js4w kernel: domain 1: span 00000000,00000000,00000000,00000003
Aug 27 15:06:36 linux-js4w kernel: groups: 00000000,00000000,00000000,00000003
Aug 27 15:11:10 linux-js4w syslog-ng[1893]: STATS: dropped 0
Aug 27 15:11:42 linux-js4w su: (to root) pbw on /dev/pts/6
Aug 27 15:11:47 linux-js4w kernel: console-kit-dae[1970]: segfault at 3320726f66 ip 415ad5 sp 7fff61e9c860 error 4 in console-kit-daemon[400000+21000]