(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-v4.4-2.6.22-common-1kdb-v4.4-2.6.22-i386-1 kdb-v4.4-2.6.22-x86_64-1 这三个patch有多长呢: 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 ...
12335 + KDB_FLAG_SET(CATASTROPHIC); /* kernel state is dubious now */ 12336 + KDB_ENTER(); 12337 + return 0; 12338 +} 12339 + 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...
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, # echo g > /pro...
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, AI检测代码解析 # echo g > /proc/sysrq-trigger 1. Using hot keyMagic Sysrqto enter the kdb debug shell immediately. ...
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