linux内核调试技巧 dump_stack()

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linux内核提供函数dump_stack()来跟踪函数的调用过程，原理是通过打印当前cpu的堆栈的调用函数来显示当前的上下文环境与调用关系；

例：

创建一个混杂设备，并定义read函数。在read中加入dump_stack()，显示read调用关系。结果如下：

[ 1560.465491] CPU: 0 PID: 2759 Comm: cat Tainted: GF          O 3.13.0-32-generic #57-Ubuntu[ 1560.465494] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/02/2015[ 1560.465496]  00000000 00000000 ddf47f58 c1650cd3 dc05e3c0 ddf47f64 e0937010 00000000[ 1560.465502]  ddf47f88 c1179238 ddf47f98 ddf47fac c1125645 00a000c9 dc05e3c0 00000000[ 1560.465506]  09431000 ddf47fac c11799a9 ddf47f98 00010000 00000000 00000000 00000003[ 1560.465511] Call Trace:[ 1560.465521]  [<c1650cd3>] dump_stack+0x41/0x52[ 1560.465525]  [<e0937010>] my_read+0x10/0x20 [test][ 1560.465529]  [<c1179238>] vfs_read+0x78/0x140[ 1560.465534]  [<c1125645>] ? SyS_fadvise64_64+0x1e5/0x260[ 1560.465537]  [<c11799a9>] SyS_read+0x49/0x90[ 1560.465542]  [<c165efcd>] sysenter_do_call+0x12/0x28

test.c

#include <linux/init.h>#include <linux/module.h>#include <linux/miscdevice.h>#include <linux/fs.h>int my_read(struct file *file, char __user *user, size_t size, loff_t * loff){        dump_stack();        printk(KERN_INFO "This is miscdevice read\n");        return 0;}int my_open(struct inode *inode, struct file *file){        printk(KERN_INFO "This is miscdevice open\n");        return 0;}int my_close(struct inode *inode, struct file *file){        printk(KERN_INFO "This is miscdevice close\n");        return 0;}const struct file_operations my_fops = {        .open = my_open,        .release = my_close,        .read = my_read,};struct miscdevice  my_misc = {        .minor = 201,        .name = "stone",        .fops = &my_fops,};static __init int hello_init(void){        misc_register(&my_misc);        printk(KERN_ALERT "helloworld!\n");        return 0;}static __exit void hello_exit(void){        misc_deregister(&my_misc);        printk(KERN_ALERT "helloworld exit!\n");}module_init(hello_init);module_exit(hello_exit);MODULE_LICENSE("GPL");MODULE_AUTHOR("Stone");

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