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    This wil go some distance to explain a few lockups I've been having
    recently. Unfortunately, I don't know what half of this means, to me it
    looks like interrupt problems. My dmesg output has some more of these
    (attached). config also attached. Lockups always occur during or after
    intensive IO.

    According to /proc/interrupts IRQ7 is not used:
    CPU0
    0: 75470904 XT-PIC timer
    1: 160 XT-PIC i8042
    2: 0 XT-PIC cascade
    4: 58 XT-PIC serial
    8: 2 XT-PIC rtc
    11: 1590851 XT-PIC eth0
    14: 198818 XT-PIC ide0
    15: 486218 XT-PIC ide1
    NMI: 0
    LOC: 0
    ERR: 3

    And my logs.

    Apr 2 06:39:58 [kernel] spurious 8259A interrupt: IRQ7.
    Apr 2 12:35:40 [kernel] [<c02d9590>] ip_finish_output2+0x0/0x1e0
    Apr 2 12:35:41 [kernel] [<c02d71a4>] ip_finish_output+0x214/0x220
    Apr 2 12:35:41 [kernel] [<c0329cf5>] svc_send+0xd5/0x120
    Apr 2 12:35:41 [kernel] [<c0211320>] nfs3svc_encode_readres+0x0/0xb0
    Apr 2 12:35:41 [kernel] [<c0326ed7>] svc_process+0x1f7/0x640
    Apr 2 12:35:41 [kernel] [<c02b88f5>] skb_drop_fraglist+0x35/0x40
    Apr 2 12:35:41 [kernel] [<c02b8999>] skb_release_data+0x79/0xa0
    Apr 2 12:35:41 [kernel] [<c02b8a4d>] __kfree_skb+0x6d/0xe0
    Apr 2 12:35:41 [kernel] [<c02b88f5>] skb_drop_fraglist+0x35/0x40
    Apr 2 12:39:48 [kernel] [<c02d9590>] ip_finish_output2+0x0/0x1e0
    Apr 2 12:48:34 [kernel] [<c02d71a4>] ip_finish_output+0x214/0x220
    Apr 2 12:48:34 [kernel] [<c03dff50>] parport_pc_pci_probe+0x30/0x1a0
    Apr 2 12:48:34 [kernel] [<c0211320>] nfs3svc_encode_readres+0x0/0xb0
    Apr 2 12:52:56 [kernel] [<c0151823>] kmem_cache_alloc+0x1a3/0x1c0
    Apr 2 12:54:04 [kernel] [<c0150e0e>] cache_alloc_refill+0x17e/0x4e0
    Apr 2 12:54:04 [kernel] [<c011d0ca>] change_page_attr+0xfa/0x190
    Apr 2 12:54:04 [kernel] [<c0150e0e>] cache_alloc_refill+0x17e/0x4e0
    Apr 2 12:54:04 [kernel] [<c010a108>] common_interrupt+0x18/0x20
    Apr 2 12:56:50 [kernel] [<c012f71b>] run_timer_softirq+0x16b/0x3c0
    Apr 2 12:57:43 [kernel] set_rtc_mmss: can't update from 11 to 57
    Apr 2 12:58:44 [kernel] set_rtc_mmss: can't update from 12 to 58
    Apr 2 12:59:12 [kernel] printk: 350 messages suppressed.
    Apr 2 12:59:12 [kernel] [<c02d7cb8>] ip_fragment+0x2f8/0x710
    Apr 2 12:59:45 [kernel] set_rtc_mmss: can't update from 13 to 59
    Apr 2 13:03:54 [kernel] apm: set display: Power management disabled
    Apr 2 13:09:04 [kernel] [<c030ab1c>] ip_refrag+0x5c/0x70
    Apr 2 13:09:04 [kernel] [<c0329cf5>] svc_send+0xd5/0x120
    Apr 2 13:17:00 [kernel] printk: 440 messages suppressed.
    Apr 2 13:17:00 [kernel] [<c02b89cb>] kfree_skbmem+0xb/0x20
    Apr 2 13:29:59 [kernel] printk: 291 messages suppressed.
    Apr 2 13:33:54 [kernel] [<c02f8e20>] udp_sendmsg+0x330/0x720
    Apr 2 13:48:13 [kernel] [<c012f42c>] update_wall_time+0xc/0x40
    Apr 2 13:49:42 [kernel] [<c02d9590>] ip_finish_output2+0x0/0x1e0
    Apr 2 13:49:42 [kernel] [<c02c95a8>] nf_hook_slow+0x68/0x110
    Apr 2 13:49:42 [kernel] [<c02d9590>] ip_finish_output2+0x0/0x1e0
    Apr 2 13:49:42 [kernel] [<c02d71a4>] ip_finish_output+0x214/0x220
    Apr 2 13:49:42 [kernel] [<c02d9590>] ip_finish_output2+0x0/0x1e0
    Apr 2 13:55:57 [kernel] set_rtc_mmss: can't update from 3 to 55
    Apr 2 13:56:58 [kernel] set_rtc_mmss: can't update from 4 to 56
    Apr 2 13:57:59 [kernel] set_rtc_mmss: can't update from 6 to 57
    Apr 2 13:59:00 [kernel] set_rtc_mmss: can't update from 7 to 59
    [unhandled content-type:application/octet-stream][unhandled content-type:application/gzip][unhandled content-type:application/gzip]
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