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[root@rhel5 bin]# pwd/usr/jboss/jboss-as-7.1.1.Final/bin[root@rhel5 bin]# nohup ./standalone.sh> /jboss.log &[root@rhel5 bin]# ps -ef|grep javaroot&&&&
99 17:56 pts/0&&& 00:00:34 /usr/java/jdk1.7.0_21/bin/java -D[Standalone] -server -XX:+UseCompressedOops -XX:+TieredCompilation -Xms64m -Xmx512m -XX:MaxPermSize=256m -Djava.net.preferIPv4Stack=true -Dorg.jboss.resolver.warning=true -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000 -Djboss.modules.system.pkgs=org.jboss.byteman -Djava.awt.headless=true -Djboss.server.default.config=standalone.xml -Dorg.jboss.boot.log.file=/usr/jboss/jboss-as-7.1.1.Final/standalone/log/boot.log -Dlogging.configuration=file:/usr/jboss/jboss-as-7.1.1.Final/standalone/configuration/logging.properties -jar /usr/jboss/jboss-as-7.1.1.Final/jboss-modules.jar -mp /usr/jboss/jboss-as-7.1.1.Final/modules -jaxpmodule javax.xml.jaxp-provider org.jboss.as.standalone -Djboss.home.dir=/usr/jboss/jboss-as-7.1.1.Finalroot&&&& 2& 0 17:57 pts/0&&& 00:00:00 grep java[root@rhel5 bin]# ./jboss-cli.sh --connect command=:shutdown{"outcome" => "success"}[root@rhel5 bin]# ps -ef|grep javaroot&&&& 2& 0 17:57 pts/0&&& 00:00:00 grep java[1]+& Done&&&&&&&&&&&&&&&&&&& nohup ./standalone.sh > /jboss.log[root@rhel5 bin]#
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请登录后评论。《coredump有关问题原理探究》Linux x86版7.6节 Map coredump例子 - Linux/Unix当前位置:& &&&《coredump有关问题原理探究》Linux x86版7.6节 Map《coredump有关问题原理探究》Linux x86版7.6节 Map coredump例子&&网友分享于：&&浏览：0次《coredump问题原理探究》Linux x86版7.6节 Map coredump例子定位一个map相关的coredump来熟悉一下:
Core was generated by `./xuzhina_dump_c07_s3_ex 5 / 6'.
Program terminated with signal 11, Segmentation fault.
0x in ?? ()
Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.149.el6_6.4.i686 libgcc-4.4.7-11.el6.i686 libstdc++-4.4.7-11.el6.i686
0x in ?? ()
0x08048bd0 in main ()
0xbfd3de7c 0xbfd3de7c
0xbfd3dee8 0xbfd3dee8
0x210296 [ PF AF SF IF RF ID ]
由于栈顶的指令地址为0x0,而eip的值也是0x0,可以知道是调用了函数指针,且函数指针的值为空.而这个函数指针是由main函数调用
看一下main函数的汇编:
(gdb) disassemble
Dump of assembler code for function main:
0x0804898f &+0&: push
0x &+1&: mov
0x &+3&: and
$0xfffffff0,%esp
0x &+6&: push
0x &+7&: push
0x &+8&: sub
$0x58,%esp
0x0804899a &+11&: cmpl
$0x3,0x8(%ebp)
0x0804899e &+15&: jg
0x80489b6 &main+39&
0x &+17&: movl
$0x8049ce4,(%esp)
0x &+24&: call
0x804883c &puts@plt&
0x080489ac &+29&: mov
$0xffffffff,%ebx
0x &+34&: jmp
0x8048c42 &main+691&
0x &+39&: lea
0x18(%esp),%eax
0x080489ba &+43&: mov
%eax,(%esp)
0x080489bd &+46&: call
0x8048c6e &_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEEC2Ev&
0x &+51&: lea
0x37(%esp),%eax
0x &+55&: mov
%eax,(%esp)
0x &+58&: call
0x804887c &_ZNSaIcEC1Ev@plt&
0x080489ce &+63&: lea
0x37(%esp),%eax
0x &+67&: mov
%eax,0x8(%esp)
0x &+71&: movl
$0x8049cfa,0x4(%esp)
---Type &return& to continue, or q &return& to quit---
0x080489de &+79&: lea
0x30(%esp),%eax
0x &+83&: mov
%eax,(%esp)
0x &+86&: call
0x80487ec &_ZNSsC1EPKcRKSaIcE@plt&
0x080489ea &+91&: lea
0x30(%esp),%eax
0x080489ee &+95&: mov
%eax,0x4(%esp)
0x &+99&: lea
0x18(%esp),%eax
0x &+103&: mov
%eax,(%esp)
0x &+106&: call
0x8048cfc &_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEEixERS5_&
0x080489fe &+111&: movl
$0x8048964,(%eax)
0x08048a04 &+117&: lea
0x30(%esp),%eax
0x08048a08 &+121&: mov
%eax,(%esp)
0x08048a0b &+124&: call
0x80487cc &_ZNSsD1Ev@plt&
0x08048a10 &+129&: jmp
0x8048a41 &main+178&
0x08048a12 &+131&: mov
0x08048a14 &+133&: mov
0x08048a16 &+135&: lea
0x30(%esp),%eax
0x08048a1a &+139&: mov
%eax,(%esp)
0x08048a1d &+142&: call
0x80487cc &_ZNSsD1Ev@plt&
0x08048a22 &+147&: mov
0x08048a24 &+149&: mov
0x08048a26 &+151&: jmp
0x8048a28 &main+153&
0x08048a28 &+153&: mov
---Type &return& to continue, or q &return& to quit---
0x08048a2a &+155&: mov
0x08048a2c &+157&: lea
0x37(%esp),%eax
0x08048a30 &+161&: mov
%eax,(%esp)
0x08048a33 &+164&: call
0x804882c &_ZNSaIcED1Ev@plt&
0x08048a38 &+169&: mov
0x08048a3a &+171&: mov
0x08048a3c &+173&: jmp
0x8048c26 &main+663&
0x08048a41 &+178&: lea
0x37(%esp),%eax
0x08048a45 &+182&: mov
%eax,(%esp)
0x08048a48 &+185&: call
0x804882c &_ZNSaIcED1Ev@plt&
0x08048a4d &+190&: lea
0x3f(%esp),%eax
0x08048a51 &+194&: mov
%eax,(%esp)
0x08048a54 &+197&: call
0x804887c &_ZNSaIcEC1Ev@plt&
0x08048a59 &+202&: lea
0x3f(%esp),%eax
0x08048a5d &+206&: mov
%eax,0x8(%esp)
0x08048a61 &+210&: movl
$0x8049cfc,0x4(%esp)
0x08048a69 &+218&: lea
0x38(%esp),%eax
0x08048a6d &+222&: mov
%eax,(%esp)
0x08048a70 &+225&: call
0x80487ec &_ZNSsC1EPKcRKSaIcE@plt&
0x08048a75 &+230&: lea
0x38(%esp),%eax
0x08048a79 &+234&: mov
%eax,0x4(%esp)
0x08048a7d &+238&: lea
0x18(%esp),%eax
0x08048a81 &+242&: mov
%eax,(%esp)
---Type &return& to continue, or q &return& to quit---
0x08048a84 &+245&: call
0x8048cfc &_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEEixERS5_&
0x08048a89 &+250&: movl
$0x8048972,(%eax)
0x08048a8f &+256&: lea
0x38(%esp),%eax
0x08048a93 &+260&: mov
%eax,(%esp)
0x08048a96 &+263&: call
0x80487cc &_ZNSsD1Ev@plt&
0x08048a9b &+268&: jmp
0x8048acc &main+317&
0x08048a9d &+270&: mov
0x08048a9f &+272&: mov
0x08048aa1 &+274&: lea
0x38(%esp),%eax
0x08048aa5 &+278&: mov
%eax,(%esp)
0x08048aa8 &+281&: call
0x80487cc &_ZNSsD1Ev@plt&
0x08048aad &+286&: mov
0x08048aaf &+288&: mov
0x08048ab1 &+290&: jmp
0x8048ab3 &main+292&
0x08048ab3 &+292&: mov
0x08048ab5 &+294&: mov
0x08048ab7 &+296&: lea
0x3f(%esp),%eax
0x08048abb &+300&: mov
%eax,(%esp)
0x08048abe &+303&: call
0x804882c &_ZNSaIcED1Ev@plt&
0x08048ac3 &+308&: mov
0x08048ac5 &+310&: mov
0x08048ac7 &+312&: jmp
0x8048c26 &main+663&
---Type &return& to continue, or q &return& to quit---
0x08048acc &+317&: lea
0x3f(%esp),%eax
0x08048ad0 &+321&: mov
%eax,(%esp)
0x08048ad3 &+324&: call
0x804882c &_ZNSaIcED1Ev@plt&
0x08048ad8 &+329&: lea
0x47(%esp),%eax
0x08048adc &+333&: mov
%eax,(%esp)
0x08048adf &+336&: call
0x804887c &_ZNSaIcEC1Ev@plt&
0x08048ae4 &+341&: lea
0x47(%esp),%eax
0x08048ae8 &+345&: mov
%eax,0x8(%esp)
0x08048aec &+349&: movl
$0x8049cfe,0x4(%esp)
0x08048af4 &+357&: lea
0x40(%esp),%eax
0x08048af8 &+361&: mov
%eax,(%esp)
0x08048afb &+364&: call
0x80487ec &_ZNSsC1EPKcRKSaIcE@plt&
0x08048b00 &+369&: lea
0x40(%esp),%eax
0x08048b04 &+373&: mov
%eax,0x4(%esp)
0x08048b08 &+377&: lea
0x18(%esp),%eax
0x08048b0c &+381&: mov
%eax,(%esp)
0x08048b0f &+384&: call
0x8048cfc &_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEEixERS5_&
0x08048b14 &+389&: movl
$0x8048983,(%eax)
0x08048b1a &+395&: lea
0x40(%esp),%eax
0x08048b1e &+399&: mov
%eax,(%esp)
0x08048b21 &+402&: call
0x80487cc &_ZNSsD1Ev@plt&
0x08048b26 &+407&: jmp
0x8048b57 &main+456&
---Type &return& to continue, or q &return& to quit---
0x08048b28 &+409&: mov
0x08048b2a &+411&: mov
0x08048b2c &+413&: lea
0x40(%esp),%eax
0x08048b30 &+417&: mov
%eax,(%esp)
0x08048b33 &+420&: call
0x80487cc &_ZNSsD1Ev@plt&
0x08048b38 &+425&: mov
0x08048b3a &+427&: mov
0x08048b3c &+429&: jmp
0x8048b3e &main+431&
0x08048b3e &+431&: mov
0x08048b40 &+433&: mov
0x08048b42 &+435&: lea
0x47(%esp),%eax
0x08048b46 &+439&: mov
%eax,(%esp)
0x08048b49 &+442&: call
0x804882c &_ZNSaIcED1Ev@plt&
0x08048b4e &+447&: mov
0x08048b50 &+449&: mov
0x08048b52 &+451&: jmp
0x8048c26 &main+663&
0x08048b57 &+456&: lea
0x47(%esp),%eax
0x08048b5b &+460&: mov
%eax,(%esp)
0x08048b5e &+463&: call
0x804882c &_ZNSaIcED1Ev@plt&
0x08048b63 &+468&: lea
0x4f(%esp),%eax
0x08048b67 &+472&: mov
%eax,(%esp)
0x08048b6a &+475&: call
0x804887c &_ZNSaIcEC1Ev@plt&
0x08048b6f &+480&: mov
0xc(%ebp),%eax
---Type &return& to continue, or q &return& to quit---
0x08048b72 &+483&: add
0x08048b75 &+486&: mov
(%eax),%eax
0x08048b77 &+488&: lea
0x4f(%esp),%edx
0x08048b7b &+492&: mov
%edx,0x8(%esp)
0x08048b7f &+496&: mov
%eax,0x4(%esp)
0x08048b83 &+500&: lea
0x48(%esp),%eax
0x08048b87 &+504&: mov
%eax,(%esp)
0x08048b8a &+507&: call
0x80487ec &_ZNSsC1EPKcRKSaIcE@plt&
0x08048b8f &+512&: lea
0x48(%esp),%eax
0x08048b93 &+516&: mov
%eax,0x4(%esp)
0x08048b97 &+520&: lea
0x18(%esp),%eax
0x08048b9b &+524&: mov
%eax,(%esp)
0x08048b9e &+527&: call
0x8048cfc &_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEEixERS5_&
0x08048ba3 &+532&: mov
(%eax),%esi
0x08048ba5 &+534&: mov
0xc(%ebp),%eax
0x08048ba8 &+537&: add
0x08048bab &+540&: mov
(%eax),%eax
0x08048bad &+542&: mov
%eax,(%esp)
0x08048bb0 &+545&: call
0x80487fc &atoi@plt&
0x08048bb5 &+550&: mov
0x08048bb7 &+552&: mov
0xc(%ebp),%eax
0x08048bba &+555&: add
---Type &return& to continue, or q &return& to quit---
0x08048bbd &+558&: mov
(%eax),%eax
0x08048bbf &+560&: mov
%eax,(%esp)
0x08048bc2 &+563&: call
0x80487fc &atoi@plt&
0x08048bc7 &+568&: mov
%ebx,0x4(%esp)
0x08048bcb &+572&: mov
%eax,(%esp)
0x08048bce &+575&: call
=& 0x08048bd0 &+577&: mov
0x08048bd2 &+579&: lea
0x48(%esp),%eax
0x08048bd6 &+583&: mov
%eax,(%esp)
0x08048bd9 &+586&: call
0x80487cc &_ZNSsD1Ev@plt&
0x08048bde &+591&: jmp
0x8048c0c &main+637&
0x08048be0 &+593&: mov
0x08048be2 &+595&: mov
0x08048be4 &+597&: lea
0x48(%esp),%eax
0x08048be8 &+601&: mov
%eax,(%esp)
0x08048beb &+604&: call
0x80487cc &_ZNSsD1Ev@plt&
0x08048bf0 &+609&: mov
0x08048bf2 &+611&: mov
0x08048bf4 &+613&: jmp
0x8048bf6 &main+615&
0x08048bf6 &+615&: mov
0x08048bf8 &+617&: mov
0x08048bfa &+619&: lea
0x4f(%esp),%eax
0x08048bfe &+623&: mov
%eax,(%esp)
0x08048c01 &+626&: call
0x804882c &_ZNSaIcED1Ev@plt&
0x08048c06 &+631&: mov
0x08048c08 &+633&: mov
0x08048c0a &+635&: jmp
0x8048c26 &main+663&
0x08048c0c &+637&: lea
0x4f(%esp),%eax
0x08048c10 &+641&: mov
%eax,(%esp)
0x08048c13 &+644&: call
0x804882c &_ZNSaIcED1Ev@plt&
0x08048c18 &+649&: lea
0x18(%esp),%eax
0x08048c1c &+653&: mov
%eax,(%esp)
0x08048c1f &+656&: call
0x8048c5a &_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEED2Ev&
0x08048c24 &+661&: jmp
0x8048c42 &main+691&
0x08048c26 &+663&: mov
0x08048c28 &+665&: mov
0x08048c2a &+667&: lea
0x18(%esp),%eax
0x08048c2e &+671&: mov
%eax,(%esp)
0x08048c31 &+674&: call
0x8048c5a &_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEED2Ev&
0x08048c36 &+679&: mov
0x08048c38 &+681&: mov
0x08048c3a &+683&: mov
%eax,(%esp)
0x08048c3d &+686&: call
0x804889c &_Unwind_Resume@plt&
0x08048c42 &+691&: mov
0x08048c44 &+693&: add
$0x58,%esp
0x08048c47 &+696&: pop
0x08048c48 &+697&: pop
0x08048c49 &+698&: mov
0x08048c4b &+700&: pop
0x08048c4c &+701&: ret
End of assembler dump.
出现coredump可能是因为这一条指令
0x08048bce &+575&: call
看一下esi的值:
(gdb) i r esi
可见esi为0,确实是由于那一条指令引起的.
那么为什么esi的值是从哪里来的?
0x08048b8f &+512&: lea
0x48(%esp),%eax
0x08048b93 &+516&: mov
%eax,0x4(%esp)
0x08048b97 &+520&: lea
0x18(%esp),%eax
0x08048b9b &+524&: mov
%eax,(%esp)
0x08048b9e &+527&: call
0x8048cfc &_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEEixERS5_&
0x08048ba3 &+532&: mov
(%eax),%esi
可见esi是0x08048b9e处所调用的函数，
_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEEixERS5_的返回值
而_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEEixERS5_的实际名称：
[xuzhina@localhost s3_ex]$ c++filt _ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEEixERS5_
std::map&std::basic_string&char, std::char_traits&char&, std::allocator&char& &, int (*)(int, int), std::less&std::basic_string&char, std::char_traits&char&, std::allocator&char& & &, std::allocator&std::pair&std::basic_string&char, std::char_traits&char&, std::allocator&char& & const, int (*)(int, int)& & &::operator[](std::basic_string&char, std::char_traits&char&, std::allocator&char& & const&)
由于map的operater[]有一个参数,由上面看,可知map对象的地址是esp+0x18，那个参数是放在esp+0x48,而这个刚好是一个string对象的this指针.见0x08048b8a调用了构造函数
0x08048b6f &+480&: mov
0xc(%ebp),%eax
0x08048b72 &+483&: add
0x08048b75 &+486&: mov
(%eax),%eax
0x08048b77 &+488&: lea
0x4f(%esp),%edx
0x08048b7b &+492&: mov
%edx,0x8(%esp)
0x08048b7f &+496&: mov
%eax,0x4(%esp)
0x08048b83 &+500&: lea
0x48(%esp),%eax
0x08048b87 &+504&: mov
%eax,(%esp)
0x08048b8a &+507&: call
0x80487ec &_ZNSsC1EPKcRKSaIcE@plt&
[xuzhina@localhost s3_ex]$ c++filt _ZNSsC1EPKcRKSaIcE
std::basic_string&char, std::char_traits&char&, std::allocator&char& &::basic_string(char const*, std::allocator&char& const&)
可知,这个string的构造函数只是接收了一个参数,而这个参数是由ebp+c所指向内存地址偏移+8所得来的.
而ebp+0xc是main函数的第二个参数，由main函数的原型
int main( int argc, char* argv[] );
这个参数应该是argv[2],而argv[2]是字符串。它的值是多少呢？
(gdb) x /wx $ebp+0xc
0xbfd3def4: 0xbfd3df94
(gdb) x /8wx 0xbfd3df94
0xbfd3df94: 0xbfd3f543 0xbfd3f55c 0xbfd3f55e 0xbfd3f560
0xbfd3dfa4: 0xxbfd3f562 0xbfd3f585 0xbfd3f5a4
(gdb) x /s 0xbfd3f55e
0xbfd3f55e:
再看一下map的内容有哪些。由上面已经知道map对象的地址是esp+0x18。且由于上面参数的类型可以知道，这个map对象的key是string类型，而val是函数指针
(gdb) x /8wx $esp+0x18
0xbfd3de98: 0xxx089aa7090
0xbfd3dea8: 0x089a70c8 0xx089a4bb84
(gdb) x /8wx 0x089a7020
0x89a00001 0xbfd3de9c 0x089aa7058
0x89aa00019
(gdb) x /8wx 0x089a7014
0x89a00001
0x89a7024: 0xbfd3de9c 0x089aaa7014
(gdb) x /s 0x089a7014
0x89a7014:
(gdb) info symbol 0x
add(int, int) in section .text of /home/xuzhina/code/s3_ex/xuzhina_dump_c07_s3_ex
(gdb) x /8wx 0x089a7090
0x89aa00000
0x89a70a0: 0x089a00019
(gdb) x /8wx 0x089a7084
0x89a00001
0x89aaa7084
(gdb) x /s 0x089a7084
0x89a7084:
(gdb) info symbol 0x
mul(int, int) in section .text of /home/xuzhina/code/s3_ex/xuzhina_dump_c07_s3_ex
(gdb) x /8wx 0x089a7058
0x89aaa70c8
0x89aa704c 0xxx
(gdb) x /8wx 0x089a704c
0x89a704c: 0xxxx
0x89a705c: 0x089aa70c8 0x089a704c
(gdb) x /s 0x089a704c
0x89a704c:
(gdb) info symbol 0x
sub(int, int) in section .text of /home/xuzhina/code/s3_ex/xuzhina_dump_c07_s3_ex
(gdb) x /8wx 0x089a70c8
0x89a70c8: 0xx089a00000
0x89a70d8: 0x089a70bc 0xxx00020f21
(gdb) x /8wx 0x089a70bc
0x89a70bc: 0xxxx
0x89a70cc: 0x089aa70bc
(gdb) x /s 0x089a70bc
0x89a70bc:
而main函数调用_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEEixERS5_除了coredump的附近之外，还有三处调用了。
0x080489ea &+91&: lea
0x30(%esp),%eax
0x080489ee &+95&: mov
%eax,0x4(%esp)
0x &+99&: lea
0x18(%esp),%eax
0x &+103&: mov
%eax,(%esp)
0x &+106&: call
0x8048cfc &_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEEixERS5_&
0x080489fe &+111&: movl
$0x8048964,(%eax)
0x08048a75 &+230&: lea
0x38(%esp),%eax
0x08048a79 &+234&: mov
%eax,0x4(%esp)
0x08048a7d &+238&: lea
0x18(%esp),%eax
0x08048a81 &+242&: mov
%eax,(%esp)
---Type &return& to continue, or q &return& to quit---
0x08048a84 &+245&: call
0x8048cfc &_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEEixERS5_&
0x08048a89 &+250&: movl
$0x8048972,(%eax)
0x08048b00 &+369&: lea
0x40(%esp),%eax
0x08048b04 &+373&: mov
%eax,0x4(%esp)
0x08048b08 &+377&: lea
0x18(%esp),%eax
0x08048b0c &+381&: mov
%eax,(%esp)
0x08048b0f &+384&: call
0x8048cfc &_ZNSt3mapISsPFiiiESt4lessISsESaISt4pairIKSsS1_EEEixERS5_&
0x08048b14 &+389&: movl
$0x8048983,(%eax)
其中0xxx8048983正好是那三个函数指针。可见，main函数并没有往map对象里面放入”/”的val。
看一下程序代码,
1 #include &map&
2 #include &string&
3 #include &stdio.h&
4 #include &stdlib.h&
6 typedef int (*oper)(int a, int b );
8 int add( int a, int b )
return a +
13 int sub( int a, int b )
return a -
18 int mul( int a, int b )
return a *
23 int main( int argc, char* argv[] )
if ( argc & 4 )
printf( &parameter less than 4\n& );
return -1;
std::map& std::string, oper& operM
operMap[&+&] = &
operMap[&-&] = ?
operMap[&*&] = &
return operMap[argv[2]]( atoi( argv[1] ), atoi( argv[3] ) );
可知,确实如上面所分析那样.所以,对于获取map里面的元素,用operator[]要慎重.
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如何使用crash工具分析Linux内核崩溃转储文件(7)
2. vmlinux 和 vmcore 版本不匹配
清单 13. vmlinux 和 vmcore 版本不匹配
[root@bondlp1 -01:37]# crash /usr/lib/debug/lib/modules/2.6.18-305.el5/vmlinux vmcore
|-------10--------20--------30--------40--------50--------60--------70--------80--------9|
|-------- XML error:
The previous line is longer than the max of 90 characters ---------|
crash 5.1.8-1.el5
Copyright (C)
Red Hat, Inc.
Copyright (C) , 2006
IBM Corporation
Copyright (C)
Hewlett-Packard Co
Copyright (C)
Fujitsu Limited
Copyright (C)
VA Linux Systems Japan K.K.
Copyright (C) 2005
NEC Corporation
Copyright (C) , 2007
Silicon Graphics, Inc.
Copyright (C) ,
Mission Critical Linux, Inc.
This program is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions.
Enter &help copying& to see the conditions.
This program has absolutely no warranty.
Enter &help warranty& for details.
GNU gdb (GDB) 7.0
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later &http://gnu.org/licenses/gpl.html&
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type &show copying&
and &show warranty& for details.
This GDB was configured as &powerpc64-unknown-linux-gnu&...
WARNING: kernel version inconsistency between vmlinux and dumpfile
please wait... (gathering module symbol data)
WARNING: cannot access vmalloc'd module memory
crash: invalid kernel virtual address: b663c8
type: &runqueues entry (per_cpu)&
|-------10--------20--------30--------40--------50--------60--------70--------80--------9|
|-------- XML error:
The previous line is longer than the max of 90 characters ---------|
这种情况说明你所使用的 vmlinux 与产生 vmcore 的内核版本不一致，需要使用相同版本的内核来调试 vmcore 文件。
3. core 文件不完整
清单 14. core 文件不完整
[root@bondlp1 -01:37]# crash /usr/lib/debug/lib/modules/2.6.18-305.el5/vmlinux vmcore
|-------10--------20--------30--------40--------50--------60--------70--------80--------9|
|-------- XML error:
The previous line is longer than the max of 90 characters ---------|
crash 5.1.8-1.el5
Copyright (C)
Red Hat, Inc.
Copyright (C) , 2006
IBM Corporation
Copyright (C)
Hewlett-Packard Co
Copyright (C)
Fujitsu Limited
Copyright (C)
VA Linux Systems Japan K.K.
Copyright (C) 2005
NEC Corporation
Copyright (C) , 2007
Silicon Graphics, Inc.
Copyright (C) ,
Mission Critical Linux, Inc.
This program is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions.
Enter &help copying& to see the conditions.
This program has absolutely no warranty.
Enter &help warranty& for details.
WARNING: vmcore: may be truncated or incomplete
PT_LOAD p_offset:
bytes required:
dumpfile size:
这个提示说明你使用的 vmcore 文件不完整。导致这个问题的原因可能有多种，硬盘空间不足，网络 dump 时网络中断等等。对于这种情况，我们需要重新 dump 一个完整的 vmcore 进行分析调试。
对于内核开发人员，crash 已经成了必不可少的一个工具。内核固然高深，但是通过 kdump 和 crash 这对战友的亲密配合，很多问题都会迎刃而解。本文仅为您介绍了 crash 的基本知识，更多的技巧还需要读者在实践中不断探索和总结。
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