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