昨天晚上第十款做数据库迁移，数据库版本：Version: '5.1.61'，数据量27G左右

message报错信息如下：

Mar  :: VM_163_210_tlinux kernel: [18465684.480438] TsysProxy invoked oom-killer: gfp_mask=0x201da, order=, oom_adj=

Mar  :: VM_163_210_tlinux kernel: [18465684.480444] Pid: , comm: TsysProxy Not tainted 2.6.32.57-tlinux_xenU-1.1.rc10-default #

Mar  :: VM_163_210_tlinux kernel: [18465684.480447] Call Trace:

Mar  :: VM_163_210_tlinux kernel: [18465684.480456]  [<ffffffff810904ab>] oom_kill_process.clone.+0xab/0x270

Mar  :: VM_163_210_tlinux kernel: [18465684.480459]  [<ffffffff81090788>] __out_of_memory+0x118/0x180

Mar  :: VM_163_210_tlinux kernel: [18465684.480462]  [<ffffffff81090872>] out_of_memory+0x82/0x170

Mar  :: VM_163_210_tlinux kernel: [18465684.480467]  [<ffffffff81098b40>] ? isolate_pages_global+0x0/0x230

Mar  :: VM_163_210_tlinux kernel: [18465684.480470]  [<ffffffff81094f09>] __alloc_pages_nodemask+0x629/0x640

Mar  :: VM_163_210_tlinux kernel: [18465684.480476]  [<ffffffff810bf376>] alloc_pages_current+0x76/0xd0

Mar  :: VM_163_210_tlinux kernel: [18465684.480481]  [<ffffffff8108db8b>] __page_cache_alloc+0xb/0x10

Mar  :: VM_163_210_tlinux kernel: [18465684.480484]  [<ffffffff810969e1>] __do_page_cache_readahead+0xc1/0x210

Mar  :: VM_163_210_tlinux kernel: [18465684.480487]  [<ffffffff81096b4c>] ra_submit+0x1c/0x20

Mar  :: VM_163_210_tlinux kernel: [18465684.480490]  [<ffffffff8108e382>] filemap_fault+0x3f2/0x440

Mar  :: VM_163_210_tlinux kernel: [18465684.480493]  [<ffffffff810a480f>] __do_fault+0x4f/0x4e0

Mar  :: VM_163_210_tlinux kernel: [18465684.480500]  [<ffffffff817a7266>] ? schedule_hrtimeout_range+0xb6/0x130

Mar  :: VM_163_210_tlinux kernel: [18465684.480503]  [<ffffffff810a6de8>] handle_mm_fault+0x1b8/0x9e0

Mar  :: VM_163_210_tlinux kernel: [18465684.480507]  [<ffffffff81048e50>] ? default_wake_function+0x0/0x10

Mar  :: VM_163_210_tlinux kernel: [18465684.480512]  [<ffffffff810e3954>] ? mntput_no_expire+0x24/0xf0

Mar  :: VM_163_210_tlinux kernel: [18465684.480517]  [<ffffffff81034460>] do_page_fault+0x110/0x2e0

Mar  :: VM_163_210_tlinux kernel: [18465684.480520]  [<ffffffff817a87d5>] page_fault+0x25/0x30

Mar  :: VM_163_210_tlinux kernel: [18465684.480521] Mem-Info:

Mar  :: VM_163_210_tlinux kernel: [18465684.480523] Node  DMA per-cpu:

Mar  :: VM_163_210_tlinux kernel: [18465684.480525] CPU    : hi:    , btch:    usd:

Mar  :: VM_163_210_tlinux kernel: [18465684.480527] CPU    : hi:    , btch:    usd:

Mar  :: VM_163_210_tlinux kernel: [18465684.480529] CPU    : hi:    , btch:    usd:

Mar  :: VM_163_210_tlinux kernel: [18465684.480530] CPU    : hi:    , btch:    usd:

Mar  :: VM_163_210_tlinux kernel: [18465684.480532] Node  DMA32 per-cpu:

Mar  :: VM_163_210_tlinux kernel: [18465684.480534] CPU    : hi:  , btch:   usd:

Mar  :: VM_163_210_tlinux kernel: [18465684.480535] CPU    : hi:  , btch:   usd:

Mar  :: VM_163_210_tlinux kernel: [18465684.480537] CPU    : hi:  , btch:   usd:

Mar  :: VM_163_210_tlinux kernel: [18465684.480539] CPU    : hi:  , btch:   usd:

Mar  :: VM_163_210_tlinux kernel: [18465684.480540] Node  Normal per-cpu:

Mar  :: VM_163_210_tlinux kernel: [18465684.480542] CPU    : hi:  , btch:   usd:

Mar  :: VM_163_210_tlinux kernel: [18465684.480544] CPU    : hi:  , btch:   usd:

Mar  :: VM_163_210_tlinux kernel: [18465684.480545] CPU    : hi:  , btch:   usd:

Mar  :: VM_163_210_tlinux kernel: [18465684.480547] CPU    : hi:  , btch:   usd:

Mar  :: VM_163_210_tlinux kernel: [18465684.480551] active_anon: inactive_anon: isolated_anon:

Mar  :: VM_163_210_tlinux kernel: [18465684.480552]  active_file: inactive_file: isolated_file:

Mar  :: VM_163_210_tlinux kernel: [18465684.480553]  unevictable: dirty: writeback: unstable:

Mar  :: VM_163_210_tlinux kernel: [18465684.480554]  free: slab_reclaimable: slab_unreclaimable:

Mar  :: VM_163_210_tlinux kernel: [18465684.480555]  mapped: shmem: pagetables: bounce:

Mar  :: VM_163_210_tlinux kernel: [18465684.480557] Node  DMA free:15836kB min:8kB low:8kB high:12kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15260kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned: all_unreclaimable? no

Mar  :: VM_163_210_tlinux kernel: [18465684.480565] lowmem_reserve[]:

Mar  :: VM_163_210_tlinux kernel: [18465684.480569] Node  DMA32 free:105924kB min:2804kB low:3504kB high:4204kB active_anon:2740028kB inactive_anon:547884kB active_file:56kB inactive_file:92kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3858656kB mlocked:0kB dirty:0kB writeback:0kB mapped:1356kB shmem:1068kB slab_reclaimable:1848kB slab_unreclaimable:2584kB kernel_stack:1080kB pagetables:7140kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned: all_unreclaimable? no

Mar  :: VM_163_210_tlinux kernel: [18465684.480578] lowmem_reserve[]:

Mar  :: VM_163_210_tlinux kernel: [18465684.480580] Node  Normal free:19200kB min:19200kB low:24000kB high:28800kB active_anon:24942124kB inactive_anon:1662984kB active_file:512kB inactive_file:764kB unevictable:0kB isolated(anon):0kB isolated(file):128kB present:26421600kB mlocked:0kB dirty:0kB writeback:0kB mapped:9268kB shmem:8396kB slab_reclaimable:13232kB slab_unreclaimable:12120kB kernel_stack:1424kB pagetables:58280kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned: all_unreclaimable? no

Mar  :: VM_163_210_tlinux kernel: [18465684.480589] lowmem_reserve[]:

Mar  :: VM_163_210_tlinux kernel: [18465684.480592] Node  DMA: *4kB *8kB *16kB *32kB *64kB *128kB *256kB *512kB *1024kB *2048kB *4096kB = 15836kB

Mar  :: VM_163_210_tlinux kernel: [18465684.480599] Node  DMA32: *4kB *8kB *16kB *32kB *64kB *128kB *256kB *512kB *1024kB *2048kB *4096kB = 106380kB

Mar  :: VM_163_210_tlinux kernel: [18465684.480606] Node  Normal: *4kB *8kB *16kB *32kB *64kB *128kB *256kB *512kB *1024kB *2048kB *4096kB = 19460kB

Mar  :: VM_163_210_tlinux kernel: [18465684.480613]  total pagecache pages

Mar  :: VM_163_210_tlinux kernel: [18465684.480615]  pages in swap cache

Mar  :: VM_163_210_tlinux kernel: [18465684.480617] Swap cache stats: add , delete , find /

Mar  :: VM_163_210_tlinux kernel: [18465684.480618] Free swap  = 0kB

Mar  :: VM_163_210_tlinux kernel: [18465684.480619] Total swap = 2097144kB

Mar  :: VM_163_210_tlinux kernel: [18465684.567838]  pages RAM

Mar  :: VM_163_210_tlinux kernel: [18465684.567841]  pages reserved

Mar  :: VM_163_210_tlinux kernel: [18465684.567842]  pages shared

Mar  :: VM_163_210_tlinux kernel: [18465684.567843]  pages non-shared

Mar  :: VM_163_210_tlinux kernel: [18465684.567848] Out of memory: kill process  (mysqld_safe) score  or a child

Mar  :: VM_163_210_tlinux kernel: [18465684.567851] Killed process  (mysqld) vsz:34419948kB, anon-rss:29649368kB, file-rss:460kB

Mar  :: VM_163_210_tlinux kernel: [18469067.168641] TCP: Possible SYN flooding on port . Sending cookies.  Check SNMP counters.

Mar  :: VM_163_210_tlinux nslcd[]: [5c31df] ldap_result() failed: Can't contact LDAP server

Mar  :: VM_163_210_tlinux nslcd[]: [5c31df] ldap_abandon() failed to abandon search: Other (e.g., implementation specific) error

mysql error log 如下：

Version: '5.1.61'  socket: '/tmp/mysql.sock'  port:   Source distribution

 :: mysqld_safe Number of processes running now:

 :: mysqld_safe mysqld restarted

参考stack-flow上面的分析：http://stackoverflow.com/questions/22522307/mysqld-safe-mysqld-restarted-automatically

死循环导致的，究其原因可能是因为innodb_buffer_size配置有问题，系统硬件内存是30G，buffer_size配置的是28G，建议rein下次导数据的时候先把buffer_size调低，导完之后再调高。

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