[illumos-Developer] Illumos device drivers (Was: Solaris Future?)

[Garrett D'Amore]

On 07/28/2011 12:01 PM, Gary Mills wrote:
> On Thu, Jul 28, 2011 at 10:54:38PM +0530, pavan tc wrote:
>>
>>     Not sure if the boot/installation CD/DVD has kmdb. No harm in trying
>>     though.
>>     Once you get the GRUB menu, press 'e' on the selected entry. Then,
>>     move
>>     to the 'kernel$' line and press 'e' again. This will allow you to edit
>>     that line.
>>     Add a '-k' in front of kernel/drv/unix. Hit enter. Type 'b' to boot.
>>     That should load KMDB.
>>     If this works, you are off to a good start. Second, pray that there is
>>     a console
>>     message indicating the possible locality of the problem. If that is of
>>     any help,
>>     you can pursue the debugging exercise to the next step.
> Yes, I've tried that many times.  At the end of a boot `-kdv', I get
> this, which I copied from the screen:
>
>      acpinex0 at root
>      acpinex0 is /fw
>      acpinex: cpu at 1, cpudrv0
>      /fw/cpu at 1 (cpudrv0) online
>      pseudo-device: dld0
>      dld0 is /pseudo/dld at 0
>      /* hung */
>
> I don't know enough about the kernel to know where to put breakpoints,
> or enough about kmdb to know how to use them effectively.
>

Press F1-A together to break into the kmdb.  Then do $c to get a stack 
back trace, plus also $<threadlist will give you a list of all kernel 
threads (very long).

     - Garrett