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How to trace the module after system freeze?

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Operating Systems Linux How to trace the module after system freeze?
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Old 09-19-2009
Power How to trace the module after system freeze?


I wrote a kernel module that did a virtual network protocol and library that provide interface for application use to interact with the kernel module by ioctl actions.

insmod the module and unload the module, there will be no problem. But once I call the library with my example application. The system freezed. And there is almost no any information on the console. So Are there any better solutions to track what happened?

Thanks very much.

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CREATE_MODULE(2)					     Linux Programmer's Manual						  CREATE_MODULE(2)

create_module - create a loadable module entry SYNOPSIS
#include <linux/module.h> caddr_t create_module(const char *name, size_t size); DESCRIPTION
create_module() attempts to create a loadable module entry and reserve the kernel memory that will be needed to hold the module. This sys- tem call requires privilege. RETURN VALUE
On success, returns the kernel address at which the module will reside. On error -1 is returned and errno is set appropriately. ERRORS
EEXIST A module by that name already exists. EFAULT name is outside the program's accessible address space. EINVAL The requested size is too small even for the module header information. ENOMEM The kernel could not allocate a contiguous block of memory large enough for the module. ENOSYS create_module() is not supported in this version of the kernel. EPERM The caller was not privileged (did not have the CAP_SYS_MODULE capability). VERSIONS
This system call is only present on Linux up until kernel 2.4; it was removed in Linux 2.6. CONFORMING TO
create_module() is Linux-specific. SEE ALSO
delete_module(2), init_module(2), query_module(2) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at Linux 2007-06-03 CREATE_MODULE(2)

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