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linux中的內(nèi)核死鎖調(diào)試

更新時(shí)間：2024年02月12日 18:19:59 作者：來自深淵的凝視

這篇文章主要介紹了linux中的內(nèi)核死鎖調(diào)試方式,具有很好的參考價(jià)值,希望對(duì)大家有所幫助,如有錯(cuò)誤或未考慮完全的地方,望不吝賜教

linux內(nèi)核死鎖調(diào)試

使用內(nèi)核的kernel hacking功能

打開以下配置

CONFIG_PROVE_LOCKING=y
CONFIG_LOCK_STAT=y
CONFIG_DEBUG_LOCKDEP=y

重新編譯內(nèi)核后，

proc目錄下會(huì)有l(wèi)ockdep lockdep_stats lockdep_chains說明lockdep模塊已經(jīng)生效

測試code

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>


static DEFINE_SPINLOCK(hack_spinA);
static DEFINE_SPINLOCK(hack_spinB);
#ifdef MEMORY_TEST
static char* buf;
static void create_slue_err(void){
    buf = kmalloc(32,GFP_KERNEL);
    if(buf)  {
        /*memset(buf,0x00,33);*/
    /*  kfree(buf);
        printk("%s\n","free buf" );*/
        /*kfree(buf);*/
        memset(buf,0x00,33);
    }

    return;
}
#endif
void hack_spinBA(void) {
    printk("%s\n","hack_spin:B=>A\n" );
    spin_lock(&hack_spinA);
    spin_lock(&hack_spinB);
}

void hack_spinAB(void) {
    printk("%s\n","hack_spin:A=>B\n" );
    spin_lock(&hack_spinB);
}

static int __init my_test_init(void) {
    printk("init %s\n", "my_test_init 1");
#ifdef MEMORY_TEST 
    create_slue_err();
#endif
    hack_spinBA();
    hack_spinAB();
    printk("init %s\n", "my_test_init 2");
    return 0;
}

static void __exit my_test_exit(void) {
    printk("%s\n","my_test_exit" );
    return ;
}
MODULE_LICENSE("GPL");
module_init(my_test_init);
module_exit(my_test_exit);

測試打?。?/p>

[ 188.596504@1] init my_test_init 1
[ 188.596548@1] hack_spin:B=>A
[ 188.596548@1]
[ 188.598679@1] hack_spin:A=>B
[ 188.598679@1]
[ 189.920389@1] BUG: spinlock lockup suspected on CPU#1, insmod/6999
[ 189.920943@1] lock: hack_spinB+0x0/0xfffffffffffffef4 [slub_test], .magic: dead4ead, .owner: insmod/6999, .owner_cpu: 1
[ 189.931758@1] CPU: 1 PID: 6999 Comm: insmod Tainted: G O 3.14.29 #6
[ 189.938784@1] Call trace:
[ 189.941406@1] [<ffffffc0010893f8>] dump_backtrace+0x0/0x144
[ 189.946896@1] [<ffffffc001089558>] show_stack+0x1c/0x28
[ 189.952120@1] [<ffffffc001b5b480>] dump_stack+0x74/0xb8
[ 189.957247@1] [<ffffffc0010fb6d4>] spin_dump+0x78/0x98
[ 189.962369@1] [<ffffffc0010fb904>] do_raw_spin_lock+0x170/0x1a8
[ 189.968199@1] [<ffffffc001b670a8>] _raw_spin_lock+0x68/0x88
[ 189.973764@1] [<ffffffbffc00507c>] hack_spinAB+0x30/0x3c [slub_test]
[ 189.980015@1] [<ffffffbffc00d028>] $x+0x28/0x4c [slub_test]
[ 189.985566@1] [<ffffffc0010816d4>] do_one_initcall+0xd4/0x13c
[ 189.991257@1] [<ffffffc00112c2f8>] load_module+0x16d8/0x1e08
[ 189.996834@1] [<ffffffc00112cba0>] SyS_finit_module+0x80/0x90

[ 211.641019@1] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 2, t=2104 jiffies, g=18446744073709551337, c=18446744073709551336, q=4)
[ 211.648804@2] Task dump for CPU 1:
[ 211.652167@2] insmod R running task 0 6999 5821 0x0000000a
[ 211.659325@2] Call trace:
[ 211.661920@2] [<ffffffc001085f10>] __switch_to+0x74/0x8c