进来系统频繁 down 掉，折腾了好几天了，但一直没能保存下相应的 log 。
今天出毛病后重启，居然看到了，赶紧在这里记录一下这个 log 。

  Nov 10 21:57:48 localhost kernel: [12622.114290] Pid: 28521, comm: udisks-helper-a Tainted: P            3.0.6-gentoo-TDesk #4 System manufacturer System Product Name/M4A88TD-M
Nov 10 21:57:48 localhost kernel: [12622.114357] RIP: 0010:[]  [] get_page_from_freelist+0x1af/0x590
Nov 10 21:57:48 localhost kernel: [12622.114420] RSP: 0000:ffff88001ca9f938  EFLAGS: 00010086
Nov 10 21:57:48 localhost kernel: [12622.114450] RAX: 7fffea0000ff8bc0 RBX: 0000000000000001 RCX: ffff88006f294030
Nov 10 21:57:48 localhost kernel: [12622.114482] RDX: ffff88006f294030 RSI: 0000000000000000 RDI: ffffffff8189b580
Nov 10 21:57:48 localhost kernel: [12622.114514] RBP: ffff88001ca9fa28 R08: dead000000200200 R09: dead000000100100
Nov 10 21:57:48 localhost kernel: [12622.114546] R10: 0000000000000001 R11: 0000000000000000 R12: ffff88006f294000
Nov 10 21:57:48 localhost kernel: [12622.114577] R13: 0000000000000003 R14: ffffea0000c4bfa0 R15: ffffffff8189b580
Nov 10 21:57:48 localhost kernel: [12622.114611] FS:  00007f04f2239700(0000) GS:ffff88006f280000(0000) knlGS:00000000f75d46c0
Nov 10 21:57:48 localhost kernel: [12622.114661] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Nov 10 21:57:48 localhost kernel: [12622.114691] CR2: 00007f62cc12c8e0 CR3: 0000000069ea5000 CR4: 00000000000006e0
Nov 10 21:57:48 localhost kernel: [12622.114723] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Nov 10 21:57:48 localhost kernel: [12622.114756] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Nov 10 21:57:48 localhost kernel: [12622.114789] Process udisks-helper-a (pid: 28521, threadinfo ffff88001ca9e000, task ffff880036fcb300)
Nov 10 21:57:48 localhost kernel: [12622.114812] Stack:
Nov 10 21:57:48 localhost kernel: [12622.114812]  0000000000000000 ffff880036fcb300 ffffffff1ca9f9a8 0000000000000001
Nov 10 21:57:48 localhost kernel: [12622.114812]  ffff880000000001 ffffffff81047ae6 ffff88001ca9faf4 0000000081009449
Nov 10 21:57:48 localhost kernel: [12622.114812]  0000000300000040 0000000000000000 ffff880000000041 ffffffff81604a80
Nov 10 21:57:48 localhost kernel: [12622.114812] Call Trace:
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] ? load_balance+0xd6/0x820
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] __alloc_pages_nodemask+0x115/0x810
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] ? sub_preempt_count+0x9d/0xd0
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] __do_page_cache_readahead+0x10d/0x280
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] ? vma_prio_tree_remove+0x80/0x100
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] ra_submit+0x21/0x30
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] filemap_fault+0x255/0x480
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] ? tlb_finish_mmu+0x14/0x40
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] __do_fault+0x55/0x510
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] ? get_parent_ip+0x11/0x50
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] handle_pte_fault+0x84/0x8c0
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] ? __vma_link_file+0x4c/0x80
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] ? vma_link+0x9d/0x100
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] handle_mm_fault+0x1d2/0x310
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] do_page_fault+0x126/0x510
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] ? do_mmap_pgoff+0x34c/0x390
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] ? sys_mmap_pgoff+0x16f/0x240
Nov 10 21:57:48 localhost kernel: [12622.114812]  [] page_fault+0x1f/0x30
Nov 10 21:57:48 localhost kernel: [12622.114812] Code: 55 a8 4d 8b 74 14 08 49 83 ee 28 49 8b 56 28 49 8b 46 30 49 b9 00 01 10 00 00 00 ad de 49 b8 00 02 20 00 00 00 ad de 48 89 42 08 
Nov 10 21:57:48 localhost [12622.114812]  89 10 4d 89 4e 28 4d 89 46 30 41 ff 0c 24 4c 89 f8 49 2b 87 
Nov 10 21:57:48 localhost kernel: [12622.114812] RIP  [] get_page_from_freelist+0x1af/0x590
Nov 10 21:57:48 localhost kernel: [12622.114812]  RSP 
Nov 10 21:57:48 localhost kernel: [12622.114812] ---[ end trace 273c5894861d71e6 ]---

刚刚 google 了一下，没看到解决方法，明天有时间的话，再找点资料仔细看看这段 log 。