- [Ref: http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=%2Fcom.ibm.aix.kdb%2Fdoc%2Fkdb%2Fkdb.htm]
- kdb command
- This command is implemented as an ordinary user-space program and is typically used for
- post-mortem analysis of a previously-crashed system by using a system dump file. The kdb command includes subcommands specific to the manipulation of system dumps.
- KDB kernel debugger
- - The KDB kernel debugger is integrated into the kernel and allows full control of the system while a debugging session is in progress. The KDB kernel debugger allows for traditional debugging tasks such as setting breakpoints and single-stepping through code.
- - KDB needs to be enabled when the system boots.
- - To check if the KDB is enabled or not, issue
$> bosdebug -L- Memory debugger off
Memory sizes 0
Network memory sizes 0
Kernel debugger off
Real Time Kernel off
Backtracking fault log on
Kernext Memory Tracking off
- - To create a kernel image with KDB enabled, issue
- $> bosdebug -D
- This will turn on the kernel debugger. You need to bosboot and reboot in order to take this effect.
- $> bosboot -a && reboot
- [After of about 20-30 mins, you will have a KDB enabled image}
- bosboot: Boot image is 49180 512 byte blocks.
- - KDB enabled kernel image is ready. All you gotto do now is, reboot.
- If you have HMC kinda machine (where you remotely try to reboot the machine), while booting, you can see Kernel Debugging is enabled.
- $> reboot
- -------------------------------------------------------------------------------
Welcome to AIX.
boot image timestamp: 11:02:54 12/26/2011
The current time and date: 11:18:52 12/26/2011
processor count: 1; memory size: 2048MB; kernel size: 28147575
boot device: /vdevice/v-scsi@30000003/disk@8100000000000000:2
kernel debugger setting: enabled
-------------------------------------------------------------------------------
Monday, February 6, 2012
Kernel Debugging
Saturday, February 4, 2012
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