swapper: page allocation failure. order:1, mode:0x20

есть очень нагруженная машина под пятой федорой. где-то раз в сутки в логе появляется следующий текст и машина немертво виснет (пингов нет, на монике ничего, на клаву забила, но кулера вертятся). ядро 2.6.18 c kernel.org (пробовал 16 и 17 из репозиториев - не помогает). выдержка из лога:
Nov 14 11:22:53 localhost kernel: swapper: page allocation failure. order:1, mode:0x20
Nov 14 11:22:53 localhost kernel: [<c0144575>] __alloc_pages+0x279/0x28d
Nov 14 11:22:53 localhost kernel: [<c0157db7>] kmem_freepages+0x81/0xa3
Nov 14 11:22:53 localhost kernel: [<c015866a>] cache_alloc_refill+0x2a6/0x496
Nov 14 11:22:53 localhost kernel: [<c01588d1>] __kmalloc+0x77/0x81
Nov 14 11:22:53 localhost kernel: [<c028f042>] __alloc_skb+0x49/0xf4
Nov 14 11:22:53 localhost kernel: [<c02b9880>] tcp_collapse+0x11f/0x2f1
Nov 14 11:22:53 localhost kernel: [<c02b9bb6>] tcp_prune_queue+0x164/0x246
Nov 14 11:22:53 localhost kernel: [<c02b9e3d>] tcp_data_queue+0x1a5/0xa26
Nov 14 11:22:53 localhost kernel: [<c02e7194>] _read_unlock_bh+0x5/0xd
Nov 14 11:22:53 localhost kernel: [<f8a79747>] ipt_do_table+0x2ac/0x2d5 [ip_tables]
Nov 14 11:22:53 localhost kernel: [<c02bbd1d>] tcp_rcv_established+0x580/0x623
Nov 14 11:22:53 localhost kernel: [<c02c0c6e>] tcp_v4_do_rcv+0x25/0x2c3
Nov 14 11:23:39 localhost kernel: [<f8ad67a8>] ip_ct_deliver_cached_events+0x45/0x6e [ip_conntrack]
Nov 14 11:23:39 localhost kernel: [<f8ad5111>] ip_confirm+0x27/0x2c [ip_conntrack]
Nov 14 11:23:39 localhost kernel: [<c02c30a6>] tcp_v4_rcv+0x88d/0x8ff
Nov 14 11:23:39 localhost kernel: [<c02aec63>] ip_generic_getfrag+0x6b/0x8c
Nov 14 11:23:39 localhost kernel: [<c02ab412>] ip_local_deliver+0x159/0x203
Nov 14 11:23:39 localhost kernel: [<c02ab280>] ip_rcv+0x3ea/0x423
Nov 14 11:23:39 localhost kernel: [<c0292e91>] netif_receive_skb+0x1e5/0x256
Nov 14 11:23:39 localhost kernel: [<f88abd0a>] skge_poll+0x306/0x3f5 [skge]
Nov 14 11:23:39 localhost kernel: [<c02947f3>] net_rx_action+0x92/0x147
Nov 14 11:23:39 localhost kernel: [<c0120b03>] __do_softirq+0x5a/0xbb
Nov 14 11:23:39 localhost kernel: [<c0105476>] do_softirq+0x4e/0x94
Nov 14 11:23:39 localhost kernel: =======================
Nov 14 11:23:39 localhost kernel: [<c010541f>] do_IRQ+0xa5/0xae
Nov 14 11:23:40 localhost kernel: [<c0103ce2>] common_interrupt+0x1a/0x20
Nov 14 11:23:40 localhost kernel: [<c010220d>] mwait_idle+0x25/0x38
Nov 14 11:23:40 localhost kernel: [<c01021d2>] cpu_idle+0x5e/0x74
Nov 14 11:23:40 localhost kernel: Mem-info:
Nov 14 11:23:40 localhost kernel: DMA per-cpu:
Nov 14 11:23:40 localhost kernel: cpu 0 hot: high 0, batch 1 used:0
Nov 14 11:23:40 localhost kernel: cpu 0 cold: high 0, batch 1 used:0
Nov 14 11:23:40 localhost kernel: cpu 1 hot: high 0, batch 1 used:0
Nov 14 11:23:40 localhost kernel: cpu 1 cold: high 0, batch 1 used:0
Nov 14 11:23:40 localhost kernel: DMA32 per-cpu: empty
Nov 14 11:23:40 localhost kernel: Normal per-cpu:
Nov 14 11:23:40 localhost kernel: cpu 0 hot: high 186, batch 31 used:27
Nov 14 11:23:40 localhost kernel: cpu 0 cold: high 62, batch 15 used:59
Nov 14 11:23:40 localhost kernel: cpu 1 hot: high 186, batch 31 used:159
Nov 14 11:23:40 localhost kernel: cpu 1 cold: high 62, batch 15 used:3
Nov 14 11:23:40 localhost kernel: HighMem per-cpu:
Nov 14 11:23:40 localhost kernel: cpu 0 hot: high 18, batch 3 used:2
Nov 14 11:23:40 localhost kernel: cpu 0 cold: high 6, batch 1 used:5
Nov 14 11:23:40 localhost kernel: cpu 1 hot: high 18, batch 3 used:0
Nov 14 11:23:40 localhost kernel: cpu 1 cold: high 6, batch 1 used:0
Nov 14 11:23:40 localhost kernel: Free pages: 9812kB (196kB HighMem)
Nov 14 11:23:40 localhost kernel: Active:75575 inactive:154108 dirty:24308 writeback:4 unstable:0 free:2453 slab:6760 mapped:2885 pagetables:474
Nov 14 11:23:40 localhost kernel: DMA free:3552kB min:68kB low:84kB high:100kB active:600kB inactive:7936kB present:16384kB pages_scanned:0 all_unreclaimable? no
Nov 14 11:23:40 localhost kernel: lowmem_reserve[]: 0 0 880 943
Nov 14 11:23:40 localhost kernel: DMA32 free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
Nov 14 11:23:40 localhost kernel: lowmem_reserve[]: 0 0 880 943
Nov 14 11:23:40 localhost kernel: Normal free:6604kB min:3756kB low:4692kB high:5632kB active:279432kB inactive:567584kB present:901120kB pages_scanned:0 all_unreclaimable? no
Nov 14 11:23:40 localhost kernel: lowmem_reserve[]: 0 0 0 509
Nov 14 11:23:40 localhost kernel: HighMem free:196kB min:128kB low:196kB high:264kB active:22140kB inactive:40528kB present:65216kB pages_scanned:0 all_unreclaimable? no
Nov 14 11:23:40 localhost kernel: lowmem_reserve[]: 0 0 0 0
Nov 14 11:23:40 localhost kernel: DMA: 32*4kB 0*8kB 0*16kB 1*32kB 1*64kB 0*128kB 1*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 3552kB
Nov 14 11:23:40 localhost kernel: DMA32: empty
Nov 14 11:23:40 localhost kernel: Normal: 1580*4kB 0*8kB 0*16kB 0*32kB 1*64kB 1*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 7024kB
Nov 14 11:23:40 localhost kernel: HighMem: 11*4kB 5*8kB 1*16kB 1*32kB 1*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 196kB
Nov 14 11:23:40 localhost kernel: Swap cache: add 13, delete 13, find 0/0, race 0+0
Nov 14 11:23:40 localhost kernel: Free swap = 2031556kB
Nov 14 11:23:40 localhost kernel: Total swap = 2031608kB
Nov 14 11:23:40 localhost kernel: Free swap: 2031556kB
Nov 14 11:23:40 localhost kernel: 245680 pages of RAM
Nov 14 11:23:40 localhost kernel: 16304 pages of HIGHMEM
Nov 14 11:23:40 localhost kernel: 3588 reserved pages
Nov 14 11:23:40 localhost kernel: 75767 pages shared
Nov 14 11:23:40 localhost kernel: 0 pages swap cached
Nov 14 11:23:40 localhost kernel: 24308 pages dirty
Nov 14 11:23:40 localhost kernel: 4 pages writeback
Nov 14 11:23:40 localhost kernel: 2885 pages mapped
Nov 14 11:23:40 localhost kernel: 6760 pages slab
Nov 14 11:23:40 localhost kernel: 474 pages pagetables
Nov 14 11:23:40 localhost kernel: ata1.00: exception Emask 0x12 SAct 0x0 SErr 0x48d0401 action 0x2 frozen
Nov 14 11:23:40 localhost kernel: ata1.00: (BMDMA stat 0x1)
Nov 14 11:23:40 localhost kernel: ata1.00: tag 0 cmd 0x25 Emask 0x16 stat 0x40 err 0x0 (ATA bus error)
Nov 14 11:23:40 localhost kernel: ata1: soft resetting port
Nov 14 11:23:40 localhost kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
Nov 14 11:23:40 localhost kernel: ata1.00: configured for UDMA/133
Nov 14 11:23:40 localhost kernel: ata1: EH complete
Nov 14 11:23:40 localhost kernel: SCSI device sda: 781422768 512-byte hdwr sectors (400088 MB)
Nov 14 11:23:40 localhost kernel: sda: Write Protect is off
Nov 14 11:23:40 localhost kernel: SCSI device sda: drive cache: write back