Linux内核模块加载报错”no symbol version for struct_module”解决办法

编译iscsi_trgt内核模块后，加载模块失败，提示“Invalid module format“，通过dmesg看到内核打印“no symbol version for struct_module“。

[root@xenserver-chen iscsitarget-1.4.20.2]# insmod /root/iscsitarget-1.4.20.2/kernel/iscsi_trgt.ko
insmod: error inserting ‘/root/iscsitarget-1.4.20.2/kernel/iscsi_trgt.ko’: -1 Invalid module format

[root@xenserver-chen iscsitarget-1.4.20.2]# dmesg

iscsi_trgt: no symbol version for struct_module
[root@xenserver-chen iscsitarget-1.4.20.2]#

使用modinfo查看iscsi_trgt模块vermagic与系统其它模块一致，同时编译模块时指向的内核源码目录、内核.config配置文件均与当前内核版本相同。多次编译，加载还是失败。

进入内核源码目录，发现少了文件Module.symvers ，重新编译内核源码make vmlinuz后，生成Module.symvers文件。再次编译iscsi_trgt内核模块，加载成功。问题得到解决。

[root@xenserver-chen linux-2.6.27.42-0.1.1.xs5.6.0.44.111158]# uname -a
Linux xenserver-chen 2.6.27.42-0.1.1.xs5.6.0.44.111158xen #1 SMP Mon May 3 21:26:51 EDT 2010 i686 i686 i386 GNU/Linux

[root@xenserver-flashcache kernel]# modinfo iscsi_trgt.ko
filename:       iscsi_trgt.ko
author:         IET development team <iscsitarget-devel@lists.sourceforge.net>
description:    iSCSI Enterprise Target
license:        GPL
version:        1.4.20.2
srcversion:     76916E3D2185ACF4ADDB096
depends:
vermagic:       2.6.27.42-0.1.1.xs5.6.0.44.111158xen SMP mod_unload modversions Xen 686
parm:           worker_thread_pool_size:Size of the worker thread pool (0 = dedicated threads per target (default)) (ulong)
parm:           debug_enable_flags:debug bitmask, low bits (0 … 8) used, see iscsi_dbg.h (ulong)
[root@xenserver-flashcache kernel]# modinfo ext3
filename:       /lib/modules/2.6.27.42-0.1.1.xs5.6.0.44.111158xen/kernel/fs/ext3/ext3.ko
license:        GPL
description:    Second Extended Filesystem with journaling extensions
author:         Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts’o and others
srcversion:     B4BED432A5A321B81F293D7
depends:        jbd
supported:      yes
vermagic:       2.6.27.42-0.1.1.xs5.6.0.44.111158xen SMP mod_unload modversions Xen 686
[root@xenserver-flashcache kernel]#

[root@xenserver-chen linux-2.6.27.42-0.1.1.xs5.6.0.44.111158]# ls
arch   buildconfigs  crypto         firmware  init    kdb     MAINTAINERS  modules.order  README          scripts   usr
block  COPYING       Documentation  fs        ipc     kernel  Makefile     net            REPORTING-BUGS  security  virt
build  CREDITS       drivers        include   Kbuild  lib     mm           perfmon        samples         sound
[root@xenserver-chen linux-2.6.27.42-0.1.1.xs5.6.0.44.111158]#

[root@xenserver-chen linux-2.6.27.42-0.1.1.xs5.6.0.44.111158]# cp /boot/config-2.6.27.42-0.1.1.xs5.6.0.44.111158xen .config

[root@xenserver-chen linux-2.6.27.42-0.1.1.xs5.6.0.44.111158]# make vmlinuz -j16

[root@xenserver-chen linux-2.6.27.42-0.1.1.xs5.6.0.44.111158]# ls
arch          COPYING        drivers   init    kernel       mm              perfmon         scripts     usr
block         CREDITS        firmware  ipc     lib          modules.order   README          security    virt
build         crypto         fs        Kbuild  MAINTAINERS  Module.symvers  REPORTING-BUGS  sound       vmlinux
buildconfigs  Documentation  include   kdb     Makefile     net             samples         System.map  vmlinux.o
[root@xenserver-chen linux-2.6.27.42-0.1.1.xs5.6.0.44.111158]#