Arch Linux

Try to unload the virtualbox driver, and see if the problem still occur.

Got one again with all vbox modules unloaded.
Trace:
Oct 12 20:19:22 support kernel: [40106.494941] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 144
Oct 12 20:19:22 support kernel: [40106.494951] Raw EDID:
Oct 12 20:19:22 support kernel: [40106.494958] <3>0f ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
Oct 12 20:19:22 support kernel: [40106.494965] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
Oct 12 20:19:22 support kernel: [40106.494971] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
Oct 12 20:19:22 support kernel: [40106.494977] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
Oct 12 20:19:22 support kernel: [40106.494983] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
Oct 12 20:19:22 support kernel: [40106.494989] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
Oct 12 20:19:22 support kernel: [40106.494996] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
Oct 12 20:19:22 support kernel: [40106.495002] <3>ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
Oct 12 20:19:22 support kernel: [40106.495006]
Oct 12 20:35:31 support kernel: [41075.809324] general protection fault: 0000 [#1] PREEMPT SMP
Oct 12 20:35:31 support kernel: [41075.809446] CPU 1
Oct 12 20:35:31 support kernel: [41075.809482] Modules linked in: des_generic ecb md4 fuse md5 hmac nls_utf8 cifs fscache ipv6 ext2 snd_hda_codec_hdmi snd_hda_codec_via radeon ttm drm_kms_helper drm sg i2c_nforce2 i2c_algo_bit i2c_core evdev edac_core edac_mce_amd snd_hda_intel snd_hda_codec forcedeth k10temp pcspkr snd_hwdep snd_pcm snd_timer snd soundcore snd_page_alloc floppy serio_raw ppdev parport_pc button thermal psmouse pci_stub cpufreq_conservative powernow_k8 freq_table processor mperf lp parport ext4 mbcache jbd2 crc16 sr_mod sd_mod cdrom ohci_hcd pata_acpi sata_nv pata_amd libata ehci_hcd scsi_mod usbcore [last unloaded: vboxdrv]
Oct 12 20:35:31 support kernel: [41075.810596]
Oct 12 20:35:31 support kernel: [41075.810626] Pid: 53, comm: kswapd0 Not tainted 3.0-ARCH #1 ECS MCP61M-M3/MCP61M-M3
Oct 12 20:35:31 support kernel: [41075.810761] RIP: 0010:[<ffffffffa00d90ee>] [<ffffffffa00d90ee>] jbd2_journal_grab_journal_head+0x1e/0xc0 [jbd2]
Oct 12 20:35:31 support kernel: [41075.810939] RSP: 0018:ffff88012780f990 EFLAGS: 00010202
Oct 12 20:35:31 support kernel: [41075.811026] RAX: ffff88012780ffd8 RBX: ffff8801283d6800 RCX: 0100000000000009
Oct 12 20:35:31 support kernel: [41075.811139] RDX: 0000000000000000 RSI: ffffea0000525e68 RDI: ffbf8800035a55b0
Oct 12 20:35:31 support kernel: [41075.811253] RBP: ffff88012780f9b0 R08: 0000000000000024 R09: 0000000000000020
Oct 12 20:35:32 support kernel: [41075.811366] R10: 0000000000000000 R11: 0000000000000000 R12: ffbf8800035a55b0
Oct 12 20:35:32 support kernel: [41075.811479] R13: 0000000000000000 R14: ffff88012780ffd8 R15: ffff88012780ffd8
Oct 12 20:35:32 support kernel: [41075.811595] FS: 00007f079b843700(0000) GS:ffff88012fc40000(0000) knlGS:00000000f4c44b70
Oct 12 20:35:32 support kernel: [41075.811724] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Oct 12 20:35:32 support kernel: [41075.811817] CR2: 00007ff455d29000 CR3: 0000000120d04000 CR4: 00000000000006e0
Oct 12 20:35:32 support kernel: [41075.811930] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Oct 12 20:35:32 support kernel: [41075.812044] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Oct 12 20:35:32 support kernel: [41075.812158] Process kswapd0 (pid: 53, threadinfo ffff88012780e000, task ffff880129333250)
Oct 12 20:35:32 support kernel: [41075.812286] Stack:
Oct 12 20:35:32 support kernel: [41075.812321] ffff88012780ffd8 ffff8801283d6800 ffff8800035a5548 ffff8801283d6800
Oct 12 20:35:32 support kernel: [41075.812456] ffff88012780fa20 ffffffffa00cefe8 ffff88012780fb58 ffffea0000525e30
Oct 12 20:35:32 support kernel: [41075.812581] ffff88012780ffd8 ffff88012780ffd8 ffffea0000525e68 ffff8800035a55b0
Oct 12 20:35:32 support kernel: [41075.812581] Call Trace:
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffffa00cefe8>] jbd2_journal_try_to_free_buffers+0x68/0x1d0 [jbd2]
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffffa00eeb22>] ext4_releasepage+0x72/0x140 [ext4]
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff810f81a5>] try_to_release_page+0x35/0x50
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff81109edc>] shrink_page_list+0x51c/0x910
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff81107d22>] ? update_isolated_counts+0x162/0x190
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff8110a6c4>] shrink_inactive_list+0x114/0x470
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff81191c94>] ? fsnotify_clear_marks_by_inode+0x94/0xf0
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff811021aa>] ? determine_dirtyable_memory+0x1a/0x30
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff8110b22c>] shrink_zone+0x4bc/0x660
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff8110c5b5>] balance_pgdat+0x4f5/0x6e0
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff8110c8a6>] kswapd+0x106/0x430
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff8107f8a0>] ? abort_exclusive_wait+0xb0/0xb0
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff8110c7a0>] ? balance_pgdat+0x6e0/0x6e0
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff8107ef4c>] kthread+0x8c/0xa0
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff813f5da4>] kernel_thread_helper+0x4/0x10
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff8107eec0>] ? kthread_worker_fn+0x190/0x190
Oct 12 20:35:32 support kernel: [41075.812581] [<ffffffff813f5da0>] ? gs_change+0x13/0x13
Oct 12 20:35:32 support kernel: [41075.812581] Code: 48 89 df e8 85 c4 0a e1 eb bb 0f 1f 00 55 48 89 e5 53 48 83 ec 18 66 66 66 66 90 65 48 8b 04 25 48 cd 00 00 83 80 44 e0 ff ff 01 <f0> 0f ba 2f 15 19 d2 85 d2 75 3a 48 8b 17 31 c0 80 e6 40 74 08
Oct 12 20:35:32 support kernel: [41075.812581] RIP [<ffffffffa00d90ee>] jbd2_journal_grab_journal_head+0x1e/0xc0 [jbd2]
Oct 12 20:35:32 support kernel: [41075.812581] RSP <ffff88012780f990>
Oct 12 20:35:32 support kernel: [41075.854719] ---[ end trace 373b70713744294b ]---
Oct 12 20:35:32 support kernel: [41075.854729] note: kswapd0[53] exited with preempt_count 1

Have you tried running memtest?

Sorry it took me so long to answer. As the PC I'm experiencing this on is my office PC, I can't just run a memtest for half an hour.
Had another occurrence today. With kernel 3.1 by now. So I ran a memtest afterwards but didn't find anything.
Unfortunately the trace seems to be maimed, because I had to hard reset the PC.

I would still suggest running memtest, best to leave it for a night.

Other way to capture trace is using netconsole: http://www.kernel.org/doc/Documentation/networking/netconsole.txt

It may be related to your hardware configuration, add "lspci -vvv" output and model of your mainboard if possible.

$ sudo lshw
support
description: Desktop Computer
product: MCP61M-M3 ()
vendor: ECS
version: 7.0
width: 64 bits
capabilities: smbios-2.6 dmi-2.6 vsyscall32
configuration: boot=normal chassis=desktop uuid=00020003-0004-0005-0006-000700080009
*-core
description: Motherboard
product: MCP61M-M3
vendor: ECS
physical id: 0
version: 7.0
*-firmware
description: BIOS
vendor: American Megatrends Inc.
physical id: 0
version: 080015
date: 06/10/2010
size: 64KiB
capacity: 960KiB
capabilities: isa pci pnp apm upgrade shadowing escd cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer int10video acpi usb ls120boot zipboot biosbootspecification
*-cpu
description: CPU
product: AMD Athlon(tm) II X4 640 Processor
vendor: Hynix Semiconductor (Hyundai Electronics)
physical id: 3
bus info: cpu@0
version: AMD Athlon(tm) II X4 640 Processor
serial: To Be Filled By O.E.M.
slot: CPU 1
size: 800MHz
capacity: 3GHz
width: 64 bits
clock: 200MHz
capabilities: x86-64 fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt npt lbrv svm_lock nrip_save cpufreq
configuration: cores=4 enabledcores=4
*-cache:0
description: L1 cache
physical id: 5
slot: L1-Cache
size: 512KiB
capacity: 512KiB
capabilities: pipeline-burst internal varies
*-cache:1
description: L2 cache
physical id: 6
slot: L2-Cache
size: 2MiB
capacity: 2MiB
capabilities: pipeline-burst internal varies
*-memory:0
description: System Memory
physical id: 24
slot: System board or motherboard
size: 4GiB
*-bank:0
description: DIMM Synchronous 667 MHz (1,5 ns)
product: 000000000000000000
vendor: Manufacturer00
physical id: 0
serial: 00000000
slot: DIMM0
size: 2GiB
width: 64 bits
clock: 667MHz (1.5ns)
*-bank:1
description: DIMM Synchronous 667 MHz (1,5 ns)
product: 000000000000000000
vendor: Manufacturer01
physical id: 1
serial: 00000000
slot: DIMM1
size: 2GiB
width: 64 bits
clock: 667MHz (1.5ns)
*-bank:2
description: [empty]
product: ModulePartNumber02
vendor: Manufacturer02
physical id: 2
serial: SerNum02
slot: DIMM2
*-bank:3
description: [empty]
product: ModulePartNumber03
vendor: Manufacturer03
physical id: 3
serial: SerNum03
slot: DIMM3
*-memory:1 UNCLAIMED
description: RAM memory
product: MCP61 Memory Controller
vendor: nVidia Corporation
physical id: 4
bus info: pci@0000:00:00.0
version: a1
width: 32 bits
clock: 66MHz (15.2ns)
capabilities: ht bus_master cap_list
configuration: latency=0
*-isa
description: ISA bridge
product: MCP61 LPC Bridge
vendor: nVidia Corporation
physical id: 1
bus info: pci@0000:00:01.0
version: a2
width: 32 bits
clock: 66MHz
capabilities: isa bus_master
configuration: latency=0
resources: ioport:4f00(size=256)
*-serial
description: SMBus
product: MCP61 SMBus
vendor: nVidia Corporation
physical id: 1.1
bus info: pci@0000:00:01.1
version: a2
width: 32 bits
clock: 66MHz
capabilities: pm cap_list
configuration: driver=nForce2_smbus latency=0
resources: irq:11 ioport:4900(size=64) ioport:4d00(size=64) ioport:4e00(size=64)
*-memory:2 UNCLAIMED
description: RAM memory
product: MCP61 Memory Controller
vendor: nVidia Corporation
physical id: 1.2
bus info: pci@0000:00:01.2
version: a2
width: 32 bits
clock: 66MHz (15.2ns)
configuration: latency=0
*-usb:0
description: USB controller
product: MCP61 USB Controller
vendor: nVidia Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: a3
width: 32 bits
clock: 66MHz
capabilities: pm ohci bus_master cap_list
configuration: driver=ohci_hcd latency=0 maxlatency=1 mingnt=3
resources: irq:20 memory:fde7f000-fde7ffff
*-usb:1
description: USB controller
product: MCP61 USB Controller
vendor: nVidia Corporation
physical id: 2.1
bus info: pci@0000:00:02.1
version: a3
width: 32 bits
clock: 66MHz
capabilities: debug pm ehci bus_master cap_list
configuration: driver=ehci_hcd latency=0 maxlatency=1 mingnt=3
resources: irq:23 memory:fde7ec00-fde7ecff
*-pci:0
description: PCI bridge
product: MCP61 PCI bridge
vendor: nVidia Corporation
physical id: 100
bus info: pci@0000:00:04.0
version: a1
width: 32 bits
clock: 66MHz
capabilities: pci ht subtractive_decode bus_master cap_list
*-multimedia
description: Audio device
product: MCP61 High Definition Audio
vendor: nVidia Corporation
physical id: 5
bus info: pci@0000:00:05.0
version: a2
width: 32 bits
clock: 66MHz
capabilities: pm msi ht bus_master cap_list
configuration: driver=snd_hda_intel latency=0 maxlatency=5 mingnt=2
resources: irq:22 memory:fde78000-fde7bfff
*-ide:0
description: IDE interface
product: MCP61 IDE
vendor: nVidia Corporation
physical id: 6
bus info: pci@0000:00:06.0
logical name: scsi4
version: a2
width: 32 bits
clock: 66MHz
capabilities: ide pm bus_master cap_list emulated
configuration: driver=pata_amd latency=0 maxlatency=1 mingnt=3
resources: irq:0 ioport:1f0(size=8) ioport:3f6 ioport:170(size=8) ioport:376 ioport:ffa0(size=16)
*-disk
description: ATA Disk
product: SAMSUNG HD400LD
physical id: 0.0.0
bus info: scsi@4:0.0.0
logical name: /dev/sdb
version: WQ10
serial: S0AXJ1LLB22622
size: 372GiB (400GB)
capabilities: partitioned partitioned:dos
configuration: ansiversion=5 signature=4779eca5
*-volume
description: Windows NTFS volume
physical id: 1
bus info: scsi@4:0.0.0,1
logical name: /dev/sdb1
version: 3.1
serial: 606508bb-2565-854b-b659-0a76ef41562b
size: 372GiB
capacity: 372GiB
capabilities: primary ntfs initialized
configuration: clustersize=4096 created=2007-02-03 13:03:30 filesystem=ntfs state=clean
*-bridge
description: Ethernet interface
product: MCP61 Ethernet
vendor: nVidia Corporation
physical id: 7
bus info: pci@0000:00:07.0
logical name: eth0
version: a2
serial: 44:87:fc:ef:10:c6
size: 100000000
capacity: 100000000
width: 32 bits
clock: 66MHz
capabilities: bridge pm msi ht bus_master cap_list ethernet physical mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=forcedeth driverversion=0.64 duplex=full ip=192.168.0.179 latency=0 link=yes maxlatency=20 mingnt=1 multicast=yes port=MII speed=100Mbit/s
resources: irq:45 memory:fde7d000-fde7dfff ioport:d480(size=8)
*-ide:1
description: IDE interface
product: MCP61 SATA Controller
vendor: nVidia Corporation
physical id: 8
bus info: pci@0000:00:08.0
logical name: scsi0
logical name: scsi1
version: a2
width: 32 bits
clock: 66MHz
capabilities: ide pm msi ht bus_master cap_list emulated
configuration: driver=sata_nv latency=0 maxlatency=1 mingnt=3
resources: irq:22 ioport:d400(size=8) ioport:d080(size=4) ioport:d000(size=8) ioport:cc00(size=4) ioport:c880(size=16) memory:fde7c000-fde7cfff
*-cdrom
description: DVD-RAM writer
product: DVDRAM GH22NS40
vendor: HL-DT-ST
physical id: 0
bus info: scsi@0:0.0.0
logical name: /dev/sr0
version: NL02
capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
configuration: ansiversion=5 status=nodisc
*-disk
description: ATA Disk
product: WDC WD5000AVVS-7
vendor: Western Digital
physical id: 1
bus info: scsi@1:0.0.0
logical name: /dev/sda
version: 01.0
serial: WD-WCAV94093435
size: 465GiB (500GB)
capabilities: partitioned partitioned:dos
configuration: ansiversion=5 signature=000ee880
*-volume:0
description: Linux filesystem partition
vendor: Linux
physical id: 1
bus info: scsi@1:0.0.0,1
logical name: /dev/sda1
logical name: /boot
version: 1.0
serial: 19089f5f-62e6-4520-9a11-a65fd414cbd2
size: 101MiB
capacity: 101MiB
capabilities: primary bootable extended_attributes ext2 initialized
configuration: filesystem=ext2 modified=2011-11-17 12:55:20 mount.fstype=ext2 mount.options=rw,relatime,errors=continue state=mounted
*-volume:1
description: Linux swap volume
physical id: 2
bus info: scsi@1:0.0.0,2
logical name: /dev/sda2
version: 1
serial: 817eaa0c-cb0f-4a8b-81d9-374aff0954c3
size: 4102MiB
capacity: 4102MiB
capabilities: primary nofs swap initialized
configuration: filesystem=swap pagesize=4096
*-volume:2
description: EXT4 volume
vendor: Linux
physical id: 3
bus info: scsi@1:0.0.0,3
logical name: /dev/sda3
logical name: /
version: 1.0
serial: fa318418-c042-41f1-9b17-c6881c1d66e1
size: 200GiB
capacity: 200GiB
capabilities: primary journaled extended_attributes large_files huge_files dir_nlink recover extents ext4 ext2 initialized
configuration: created=2011-09-02 17:46:14 filesystem=ext4 lastmountpoint=/ modified=2011-10-25 09:22:45 mount.fstype=ext4 mount.options=rw,relatime,user_xattr,acl,barrier=1,data=ordered mounted=2011-11-17 12:55:19 state=mounted
*-volume:3
description: EXT4 volume
vendor: Linux
physical id: 4
bus info: scsi@1:0.0.0,4
logical name: /dev/sda4
logical name: /home
version: 1.0
serial: 2eb5ad84-3661-496e-aaf4-a735c41eeabc
size: 261GiB
capacity: 261GiB
capabilities: primary journaled extended_attributes large_files huge_files dir_nlink recover extents ext4 ext2 initialized
configuration: created=2011-09-02 17:46:20 filesystem=ext4 lastmountpoint=/home modified=2011-11-17 12:55:20 mount.fstype=ext4 mount.options=rw,relatime,user_xattr,acl,barrier=1,data=ordered mounted=2011-11-17 12:55:20 state=mounted
*-ide:2
description: IDE interface
product: MCP61 SATA Controller
vendor: nVidia Corporation
physical id: 8.1
bus info: pci@0000:00:08.1
version: a2
width: 32 bits
clock: 66MHz
capabilities: ide pm msi ht bus_master cap_list
configuration: driver=sata_nv latency=0 maxlatency=1 mingnt=3
resources: irq:21 ioport:c800(size=8) ioport:c480(size=4) ioport:c400(size=8) ioport:c080(size=4) ioport:c000(size=16) memory:fde77000-fde77fff
*-pci:1
description: PCI bridge
product: MCP61 PCI Express bridge
vendor: nVidia Corporation
physical id: 9
bus info: pci@0000:00:09.0
version: a2
width: 32 bits
clock: 33MHz
capabilities: pci pm msi ht pciexpress normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:40 ioport:e000(size=4096) memory:fdf00000-fdffffff ioport:d0000000(size=268435456)
*-display
description: VGA compatible controller
product: Cedar PRO [Radeon HD 5450]
vendor: ATI Technologies Inc
physical id: 0
bus info: pci@0000:02:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:43 memory:d0000000-dfffffff memory:fdfe0000-fdffffff ioport:e000(size=256) memory:fdfc0000-fdfdffff
*-multimedia
description: Audio device
product: Manhattan HDMI Audio [Mobility Radeon HD 5000 Series]
vendor: ATI Technologies Inc
physical id: 0.1
bus info: pci@0000:02:00.1
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:44 memory:fdfbc000-fdfbffff
*-pci:2
description: PCI bridge
product: MCP61 PCI Express bridge
vendor: nVidia Corporation
physical id: b
bus info: pci@0000:00:0b.0
version: a2
width: 32 bits
clock: 33MHz
capabilities: pci pm msi ht pciexpress normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:41
*-pci:3
description: PCI bridge
product: MCP61 PCI Express bridge
vendor: nVidia Corporation
physical id: c
bus info: pci@0000:00:0c.0
version: a2
width: 32 bits
clock: 33MHz
capabilities: pci pm msi ht pciexpress normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:42 memory:fe000000-fe0fffff
*-pci:4
description: Host bridge
product: Family 10h Processor HyperTransport Configuration
vendor: Hynix Semiconductor (Hyundai Electronics)
physical id: 101
bus info: pci@0000:00:18.0
version: 00
width: 32 bits
clock: 33MHz
*-pci:5
description: Host bridge
product: Family 10h Processor Address Map
vendor: Hynix Semiconductor (Hyundai Electronics)
physical id: 102
bus info: pci@0000:00:18.1
version: 00
width: 32 bits
clock: 33MHz
*-pci:6
description: Host bridge
product: Family 10h Processor DRAM Controller
vendor: Hynix Semiconductor (Hyundai Electronics)
physical id: 103
bus info: pci@0000:00:18.2
version: 00
width: 32 bits
clock: 33MHz
*-pci:7
description: Host bridge
product: Family 10h Processor Miscellaneous Control
vendor: Hynix Semiconductor (Hyundai Electronics)
physical id: 104
bus info: pci@0000:00:18.3
version: 00
width: 32 bits
clock: 33MHz
configuration: driver=k10temp
resources: irq:0
*-pci:8
description: Host bridge
product: Family 10h Processor Link Control
vendor: Hynix Semiconductor (Hyundai Electronics)
physical id: 105
bus info: pci@0000:00:18.4
version: 00
width: 32 bits
clock: 33MHz
*-scsi
physical id: a
bus info: usb@1:5
logical name: scsi6
capabilities: emulated scsi-host
configuration: driver=usb-storage
*-disk
description: SCSI Disk
physical id: 0.0.0
bus info: scsi@6:0.0.0
logical name: /dev/sdc

This should contain all the hardware info. How should running a memtest over night find more than running it once? I've had it complete one pass.

> How should running a memtest over night find more than running it once? I've had it complete one pass.

Memory sometimes only returns wrong data on very specific values (there's randomization of pattern in memtest) and it may be temperature dependant (it returns erroneous data when hot).
Also, I'd say that full test of 4GB of memory in 30min on that platform is suspiciously fast, you sure it did full pass of the top progress bar, not just the lower one?

Definitely the upper one. The first few passes of the lower one only take a couple of seconds. I don't think Memtest 86+ would betray me on this. But OK, I'll leave the memtest running over night.

Left it running over night and here's what's been found:
^Test^Pass^Failing Address ^Good ^Bad ^Err-Bits^Count^Chan^
|7 |1 |00002512b34 - 37.0MB|d470629d|d430629d|00400000| 1| |
|4 |12 |000035a55bd - 53.6MB|776e0031|772e0031|00400000| 6| |
|5 |12 |00002512b34 - 37.0MB|7fffffff|7fbfffff|00400000| 7| |
|5 |12 |00006512f70 - 101.0MB|7fffffff|7fbfffff|00400000| 8| |
|7 |14 |00002512b34 - 37.0MB|835b09f2|831b09f2|00400000| 9| |
|5 |16 |00002512b34 - 37.0MB|fffdffff|ffbdffff|00400000| 11| |
|5 |16 |00006512f70 - 101.0MB|fffdffff|ffbdffff|00400000| 12| |
|7 |16 |00002512b34 - 37.0MB|8aede46d|8aade46d|00400000| 13| |

So I guess the ticket can be closed as it's quite obviously the RAM's fault.

EDIT: I hoped to have wiki formatting here :/