(2)此外,在内核挂死后,系统也会自动进入kdb,从而使用户可以方便地调试问题。例如,下例为通过sysrq命令进入手动panic,此时系统会自动进入kdb: [root@pan ]# echo c > /proc/sysrq-trigger [ 1588.968148] sysrq: Trigger a crash [ 1588.969180] Kernel panic - not syncing: sysrq triggered crash [ 1588.96...
KDB: enter: panic [thread pid 12 tid 100132] Stopped at kdb_enter+0x3b: movq $0,kdb_why Booting in Safe Mode works fine but I'm not comfortable with that. I tried a complete reinstall but the error stays. Looks like this version of Freebsd dus not like my server? The hardware is ...
static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs) { unsigned long flags; int sstep_tries = 100; int error = 0; int error; int i, cpu; int trace_on = 0; acquirelock: @@ -460,6 +486,8 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_re...
localhost:/usr/src # wc -l kdb-v4.4-2.6.22-* 17943 kdb-v4.4-2.6.22-common-1 14753 kdb-v4.4-2.6.22-i386-1 14249 kdb-v4.4-2.6.22-x86_64-1 46945 total 我的神,46945行.第一个patch是最基本的patch.第二个patch是针对i386的.第三个patch是针对x86_64的.如果你只对i386感兴趣...
12340 +static struct notifier_block kdb_block = { kdb_panic, NULL, 0 }; 以后我们会看到KDB_ENTER()这个宏将引领我们进入kdb.只是此刻我想,kernel崩溃了,可以进入kdb,看代码的我崩溃了,找谁去? 再然后是register_cpu_notifier,这又是注册啥呢?暂时不得而知. ...
2.2 How could we enter the kdb debug shell? If kdb/kgdb is enabled, there are 3 ways to drop into kdb debug shell, While Linux kernel got panicked, kernel panic routine will calls into kgdb callback. Under the bash prompt, using root to write to sysrq proc file, ...
2.2 How could we enter the kdb debug shell? If kdb/kgdb is enabled, there are 3 ways to drop into kdb debug shell, While Linux kernel got panicked, kernel panic routine will calls into kgdb callback. Under the bash prompt, using root to write to sysrq proc file, ...
这是一个很冷门的话题,它受关注的程度永远也比不上陈冠希老师的摄影作品.不过人在江湖身不由己,因为工作原因我不得不接触它,不得不了解一点kdb的代码. Kdb,也叫kernel debugger.是Linux系统的内核调试器,它是一个开源工具,乃是SGI公司开发的.kdb适用于调试内核空间的程序代
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60 NORET_TYPE void panic(const char * fmt, ...) 61 { 62 long i; 63 static char buf[1024]; 64 va_list args; 65 #if defined(CONFIG_S390) 66 unsigned long caller = (unsigned long) __builtin_return_address(0); 67 #endif 68 69 /* 70 * It's possible to come here directly ...