Thread: Invalid opcode

hello all.
ubuntu, dealing issue beyond understanding @ moment.
@ random times (usually when watching movie in xbmc), computer locks up. can still ssh in , 'dmesg' output before locks too. hard reboot required things going again.
have cut out date/time/server columns easier reading, please ask if these seem relevant omissions...

system:
ubuntu 11.04 (2.6.38-8-server) x64
x11 installed icewm (and xbmc)
core 2 duo e8400 @ 3.00ghz
8 gb ram
asus p5q premium motherboard
primary harddrive: ocz vertex 2 60 gb (ssd)
other harddrives: various 750gb, 1tb, 1.5tb & 2tb (wd & samsung)

important information not supplying purely sign of incompetence in these matters, please ask , excuse me inabilities...

code:

 invalid opcode: 0000 [#1] smp   last sysfs file: /sys/devices/system/cpu/cpu1/cache/index2/shared_cpu_map   cpu 0   modules linked in: parport_pc ppdev vesafb snd_hda_codec_analog tuner_simple tuner_types wm8775 tda9887 tda8290 tea5767 tuner cx25840 ir_lirc_codec lirc_dev snd_hda_intel snd_hda_codec snd_hwdep snd_pcm ir_sony_decoder snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq rc_rc6_mce ivtv ir_jvc_decoder cx2341x i2c_algo_bit v4l2_common mceusb videodev ir_rc6_decoder ir_rc5_decoder snd_timer ir_nec_decoder nvidia(p) btusb bluetooth rc_core v4l2_compat_ioctl32 tveeprom snd_seq_device pata_marvell psmouse shpchp serio_raw snd asus_atk0110 soundcore snd_page_alloc lp parport firewire_ohci firewire_core crc_itu_t r8169 sky2 ahci libahci     pid: 4597, comm: xbmc.bin tainted: p            2.6.38-8-server #42-ubuntu system manufacturer p5q premium/p5q premium   rip: 0010:[<ffffffff8119bc4a>]  [<ffffffff8119bc4a>] do_mpage_readpage+0x9a/0x510   rsp: 0018:ffff88021f5a59d8  eflags: 00210246   rax: 0000000000000020 rbx: ffff88021f5a5ac8 rcx: 0000000000000000   rdx: 0000000000000001 rsi: 0000000015e36fe0 rdi: 0000000000000000   rbp: ffff88021f5a5a98 r08: ffff88021f5a5ac8 r09: ffff88021f5a5b38   r10: 0000000000000000 r11: 0000000000000000 r12: 0000000000000000   r13: 000000000000b148 r14: 0000000000000001 r15: ffff8802067034b8   fs:  00007f3f34eb1700(0000) gs:ffff8800cfc00000(0000) knlgs:0000000000000000   cs:  0010 ds: 0000 es: 0000 cr0: 0000000080050033   cr2: 00007feb8d515000 cr3: 000000021d744000 cr4: 00000000000406f0   dr0: 0000000000000000 dr1: 0000000000000000 dr2: 0000000000000000   dr3: 0000000000000000 dr6: 00000000ffff0ff0 dr7: 0000000000000400   process xbmc.bin (pid: 4597, threadinfo ffff88021f5a4000, task ffff88021f63db80)   stack:    ffff88021f5a5a28 ffffffff8116019d ffff88021f5a5b40 0000002000000003    ffff88021f5a5b38 ffff880206703370 ffffea0006d800f8 0000000000000000    ffffea0006d800f8 0000000c811270b5 ffff88021f5a5a68 ffffffff8110bdba   call trace:    [<ffffffff8116019d>] ? mem_cgroup_cache_charge+0xed/0x130    [<ffffffff8110bdba>] ? add_to_page_cache_locked+0xea/0x160    [<ffffffff8119c232>] mpage_readpages+0x102/0x150    [<ffffffff812063e0>] ? ext4_get_block+0x0/0x20    [<ffffffff812063e0>] ? ext4_get_block+0x0/0x20    [<ffffffff81149475>] ? alloc_pages_current+0xa5/0x110    [<ffffffff8120157d>] ext4_readpages+0x1d/0x20    [<ffffffff81116a9b>] __do_page_cache_readahead+0x14b/0x220    [<ffffffff81116ed1>] ra_submit+0x21/0x30    [<ffffffff81116ff5>] ondemand_readahead+0x115/0x230    [<ffffffff811171a0>] page_cache_async_readahead+0x90/0xc0    [<ffffffff8110b184>] ? file_read_actor+0xd4/0x170    [<ffffffff812de72e>] ? radix_tree_lookup_slot+0xe/0x10    [<ffffffff8110c521>] do_generic_file_read.clone.23+0x271/0x450    [<ffffffff8110d1ba>] generic_file_aio_read+0x1ca/0x240    [<ffffffff8100a82e>] ? __switch_to+0x20e/0x2f0    [<ffffffff81164c82>] do_sync_read+0xd2/0x110    [<ffffffff8108b61c>] ? hrtimer_try_to_cancel+0x4c/0xe0    [<ffffffff81279083>] ? security_file_permission+0x93/0xb0    [<ffffffff81164fa1>] ? rw_verify_area+0x61/0xf0    [<ffffffff81165463>] vfs_read+0xc3/0x180    [<ffffffff81165571>] sys_read+0x51/0x90    [<ffffffff8100bfc2>] system_call_fastpath+0x16/0x1b   code: ff ff 48 c7 85 78 ff ff ff 00 00 00 00 49 d3 ee b9 0c 00 00 00 2b 4d 8c 48 8b b2 c8 00 00 00 ba 01 00 00 00 41 0f af c6 49 d3 e5 <0f> 36 4d 8c 4c 01 e8 d3 e2 4c 8d 44 16 ff 48 8b 53 20 49 d3 f8   rip  [<ffffffff8119bc4a>] do_mpage_readpage+0x9a/0x510    rsp <ffff88021f5a59d8>   ---[ end trace ac6cd2f4692205a3 ]---

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