libjvm.so stripped

1. libjvm.so stripped

即：libjvm.so这个文件被处理过，很多符号调试信息被玻璃了。类似的apache等软件编译时也可以选择是否剥离调试信息。

剥离符号信息的意义在于可以减少当前模块的大小，减少加载后占用的内存大小；造成的影响时，jvm crash后，很多符号调试信息都看不到了，分析crash过程变得很复杂。

2. 查看libjvm情况：

查看命令：file /opt/.../java/jre/lib/amd64/server/libjvm.so

     libjvm.so: ELF 64-bit LSB shared object, AMD x86-64, version 1 (SYSV), stripped

没有被stripped的则是not stripped

3. libjvm stripped造成的影响会导致attach不上core文件

命令： $jstack java core.24706

Attaching to core core.24706 from executable java, please wait...
Error attaching to core file: Can't attach to the core file

4. 查看具体找不到的符号

详见地址：https://gist.github.com/1525916

$ export LIBSAPROC_DEBUG=1
$ jstack -m $JAVA_HOME/bin/java core.11028
Attaching to core core.11028 from executable /opt/taobao/java/bin/java, please wait...
libsaproc DEBUG: Note header with n_type = 1 and n_descsz = 336
libsaproc DEBUG: got integer regset for lwp 11386
libsaproc DEBUG: integer regset
libsaproc DEBUG:        r15 = 0x2aab79aac1b8
libsaproc DEBUG:        r14 = 0x466290c0
libsaproc DEBUG:        r13 = 0x0
libsaproc DEBUG:        r12 = 0x4a
libsaproc DEBUG:        rbp = 0x46619040
libsaproc DEBUG:        rbx = 0x4a
libsaproc DEBUG:        r11 = 0x2b0418151548
libsaproc DEBUG:        r10 = 0xbc4
libsaproc DEBUG:        r9 = 0x2aaaca680f48
libsaproc DEBUG:        r8 = 0x46619070
libsaproc DEBUG:        rax = 0x2b04181446a0
libsaproc DEBUG:        rcx = 0x4a
libsaproc DEBUG:        rdx = 0x0
libsaproc DEBUG:        rsi = 0x466290c0
libsaproc DEBUG:        rdi = 0x2aab79aac000
libsaproc DEBUG:        orig_rax = 0xffffffffffffffff
libsaproc DEBUG:        rip = 0x2b0417c60971
libsaproc DEBUG:        cs = 0xe033
libsaproc DEBUG:        eflags = 0x10206
libsaproc DEBUG:        rsp = 0x46618fc0
libsaproc DEBUG:        ss = 0xe02b
libsaproc DEBUG:        fs_base = 0x0
libsaproc DEBUG:        gs_base = 0x0
libsaproc DEBUG:        ds = 0x0
libsaproc DEBUG:        es = 0x0
libsaproc DEBUG:        fs = 0x63
libsaproc DEBUG:        gs = 0x0
libsaproc DEBUG: Note header with n_type = 3 and n_descsz = 136
libsaproc DEBUG: Note header with n_type = 6 and n_descsz = 256
libsaproc DEBUG: Note header with n_type = 1 and n_descsz = 336
libsaproc DEBUG: got integer regset for lwp 12741
libsaproc DEBUG: integer regset
libsaproc DEBUG:        r15 = 0x2aab7a5db000
libsaproc DEBUG:        r14 = 0x2aab7a5db000
...
libsaproc DEBUG: base = 0x7fffbaa67000  size = 86016
libsaproc DEBUG: lookup failed for symbol 'UseSharedSpaces' in obj '/opt/taobao/install/jdk-1.6.0_17/jre/lib/amd64/server/libjvm.so'
libsaproc DEBUG: can't lookup 'UseSharedSpaces' flag
Error attaching to core file: Can't attach to the core file
$

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