我运行以下命令来创build快照卷。 但内核收到一个错误，kvmpipe理程序停止响应。 为什么是错误和如何解决它？
lvcreate -L20G -s -n volume_A_backup /dev/vgroup/volumeA 错误日志：
Mar 10 02:36:59 kvm kernel: BUG: Bad page map in process udevd pte:800000081ad43645 pmd:409f37067 Mar 10 02:36:59 kvm kernel: addr:00006aff4f837000 vm_flags:00100173 anon_vma:ffff88081f7dc448 mapping:(null) index:7fffffff1 Mar 10 02:37:02 kvm kernel: Pid: 5091, comm: udevd Not tainted 2.6.32-358.18.1.el6.x86_64 #1 Mar 10 02:37:03 kvm kernel: Call Trace: Mar 10 02:37:03 kvm kernel: [<ffffffff8113ef18>] ? print_bad_pte+0x1d8/0x290 Mar 10 02:37:03 kvm kernel: [<ffffffff8111b970>] ? generic_file_aio_read+0x380/0x700 Mar 10 02:37:03 kvm kernel: [<ffffffff8113f03b>] ? vm_normal_page+0x6b/0x70 Mar 10 02:37:03 kvm kernel: [<ffffffff8114179f>] ? unmap_vmas+0x61f/0xc30 Mar 10 02:37:03 kvm kernel: [<ffffffff811476d7>] ? exit_mmap+0x87/0x170 Mar 10 02:37:03 kvm kernel: [<ffffffff8106b50c>] ? mmput+0x6c/0x120 Mar 10 02:37:03 kvm kernel: [<ffffffff811889a4>] ? flush_old_exec+0x484/0x690 Mar 10 02:37:03 kvm kernel: [<ffffffff811d9700>] ? load_elf_binary+0x350/0x1ab0 Mar 10 02:37:03 kvm kernel: [<ffffffff8113f3ff>] ? follow_page+0x31f/0x470 Mar 10 02:37:03 kvm kernel: [<ffffffff811446e0>] ? __get_user_pages+0x110/0x430 Mar 10 02:37:03 kvm kernel: [<ffffffff811d7abe>] ? load_misc_binary+0x9e/0x3f0 Mar 10 02:37:03 kvm kernel: [<ffffffff81144a99>] ? get_user_pages+0x49/0x50 Mar 10 02:37:03 kvm kernel: [<ffffffff81189fa7>] ? search_binary_handler+0x137/0x370 Mar 10 02:37:03 kvm kernel: [<ffffffff8118a4f7>] ? do_execve+0x217/0x2c0 Mar 10 02:37:03 kvm kernel: [<ffffffff810095ea>] ? sys_execve+0x4a/0x80 Mar 10 02:37:03 kvm kernel: [<ffffffff8100b4ca>] ? stub_execve+0x6a/0xc0 Mar 10 02:37:03 kvm kernel: Disabling lock debugging due to kernel taint Mar 10 02:37:03 kvm kernel: BUG: Bad page map in process dmsetup pte:00000700 pmd:409f34067 Mar 10 02:37:03 kvm kernel: addr:00006a3dcd3df000 vm_flags:08000070 anon_vma:(null) mapping:ffff88081b8385e0 index:27 Mar 10 02:37:03 kvm kernel: vma->vm_ops->fault: filemap_fault+0x0/0x500 Mar 10 02:37:03 kvm kernel: vma->vm_file->f_op->mmap: ext4_file_mmap+0x0/0x60 [ext4] Mar 10 02:37:04 kvm kernel: Pid: 5091, comm: dmsetup Tainted: GB --------------- 2.6.32-358.18.1.el6.x86_64 #1 Mar 10 02:37:04 kvm kernel: Call Trace: Mar 10 02:37:04 kvm kernel: [<ffffffff8113ef18>] ? print_bad_pte+0x1d8/0x290 Mar 10 02:37:04 kvm kernel: [<ffffffff8113f03b>] ? vm_normal_page+0x6b/0x70 Mar 10 02:37:04 kvm kernel: [<ffffffff8114179f>] ? unmap_vmas+0x61f/0xc30 Mar 10 02:37:04 kvm kernel: [<ffffffff811476d7>] ? exit_mmap+0x87/0x170 Mar 10 02:37:04 kvm kernel: [<ffffffff8106b50c>] ? mmput+0x6c/0x120 Mar 10 02:37:04 kvm kernel: [<ffffffff8107312b>] ? exit_mm+0x12b/0x180 Mar 10 02:37:04 kvm kernel: [<ffffffff810734df>] ? do_exit+0x15f/0x870 Mar 10 02:37:04 kvm kernel: [<ffffffff81073c48>] ? do_group_exit+0x58/0xd0 Mar 10 02:37:04 kvm kernel: [<ffffffff81073cd7>] ? sys_exit_group+0x17/0x20 Mar 10 02:37:04 kvm kernel: [<ffffffff8100b072>] ? system_call_fastpath+0x16/0x1b Mar 10 02:37:04 kvm kernel: BUG: Bad page map in process dmsetup pte:00000f00 pmd:409f34067 Mar 10 02:37:04 kvm kernel: addr:00006a3dcd3ef000 vm_flags:08000070 anon_vma:(null) mapping:ffff88081b8385e0 index:37 Mar 10 02:37:04 kvm kernel: vma->vm_ops->fault: filemap_fault+0x0/0x500 Mar 10 02:37:05 kvm kernel: vma->vm_file->f_op->mmap: ext4_file_mmap+0x0/0x60 [ext4] Mar 10 02:37:05 kvm kernel: Pid: 5091, comm: dmsetup Tainted: GB --------------- 2.6.32-358.18.1.el6.x86_64 #1 Mar 10 02:37:05 kvm kernel: Call Trace: Mar 10 02:37:05 kvm kernel: [<ffffffff8113ef18>] ? print_bad_pte+0x1d8/0x290 Mar 10 02:37:05 kvm kernel: [<ffffffff8113f03b>] ? vm_normal_page+0x6b/0x70 Mar 10 02:37:05 kvm kernel: [<ffffffff8114179f>] ? unmap_vmas+0x61f/0xc30 Mar 10 02:37:05 kvm kernel: [<ffffffff811476d7>] ? exit_mmap+0x87/0x170 Mar 10 02:37:05 kvm kernel: [<ffffffff8106b50c>] ? mmput+0x6c/0x120 Mar 10 02:37:05 kvm kernel: [<ffffffff8107312b>] ? exit_mm+0x12b/0x180 Mar 10 02:37:05 kvm kernel: [<ffffffff810734df>] ? do_exit+0x15f/0x870 Mar 10 02:37:05 kvm kernel: [<ffffffff81073c48>] ? do_group_exit+0x58/0xd0 Mar 10 02:37:05 kvm kernel: [<ffffffff81073cd7>] ? sys_exit_group+0x17/0x20 Mar 10 02:37:05 kvm kernel: [<ffffffff8100b072>] ? system_call_fastpath+0x16/0x1b Mar 10 02:37:05 kvm kernel: BUG: Bad page map in process dmsetup pte:00000f00 pmd:409f35067 Mar 10 02:37:05 kvm kernel: addr:00006a3dcd447000 vm_flags:08000070 anon_vma:(null) mapping:ffff88081b8385e0 index:8f Mar 10 02:37:05 kvm kernel: vma->vm_ops->fault: filemap_fault+0x0/0x500 Mar 10 02:37:05 kvm kernel: vma->vm_file->f_op->mmap: ext4_file_mmap+0x0/0x60 [ext4] Mar 10 02:37:05 kvm kernel: Pid: 5091, comm: dmsetup Tainted: GB --------------- 2.6.32-358.18.1.el6.x86_64 #1 Mar 10 02:37:05 kvm kernel: Call Trace: Mar 10 02:37:05 kvm kernel: [<ffffffff8113ef18>] ? print_bad_pte+0x1d8/0x290 Mar 10 02:37:05 kvm kernel: [<ffffffff8112f42e>] ? __put_single_page+0x1e/0x30 Mar 10 02:37:05 kvm kernel: [<ffffffff8113f03b>] ? vm_normal_page+0x6b/0x70 Mar 10 02:37:05 kvm kernel: [<ffffffff8114179f>] ? unmap_vmas+0x61f/0xc30 Mar 10 02:37:05 kvm kernel: [<ffffffff811476d7>] ? exit_mmap+0x87/0x170 Mar 10 02:37:05 kvm kernel: [<ffffffff8106b50c>] ? mmput+0x6c/0x120 Mar 10 02:37:05 kvm kernel: [<ffffffff8107312b>] ? exit_mm+0x12b/0x180 Mar 10 02:37:05 kvm kernel: [<ffffffff810734df>] ? do_exit+0x15f/0x870 Mar 10 02:37:05 kvm kernel: [<ffffffff81073c48>] ? do_group_exit+0x58/0xd0 Mar 10 02:37:05 kvm kernel: [<ffffffff81073cd7>] ? sys_exit_group+0x17/0x20 Mar 10 02:37:05 kvm kernel: [<ffffffff8100b072>] ? system_call_fastpath+0x16/0x1b Mar 10 02:37:05 kvm kernel: BUG: Bad page map in process dmsetup pte:00000300 pmd:409f35067
你的内核被污染了：
Tainted: GB
B意思是[1]：
在坏页面状态中发现一个进程，表明虚拟内存子系统的损坏，可能是由RAM或高速缓冲存储器故障引起的。
基本上大部分BUG: Bad page map in process都与物理内存故障有关。 但在虚拟化的情况下，它可能也是一个hypervizor的bug。 但是我build议你先检查一下mcelog(8) 。