Panic on connecting external harddrive

[Marcel Moolenaar]

On Feb 13, 2008, at 10:26 AM, Ben Stuyts wrote:

> Hi,
>
> On 13 Feb 2008, at 18:36, Ben Stuyts wrote:
>
>> I'm trying, but I can't get a crashdump. I have dumpdev in rc.conf  
>> set to my swap partition, and during booting it correctly says it  
>> will dump to that device. My swap is 4 GB and I have 4 GB memory,  
>> but doing the math it should fit.
>
> Here is something really odd: For debugging I had
>
> options         KDB
> options         DDB
> options         GDB
>
> in my kernel conf. To find out why it would not dump, I removed DDB  
> and GDB, and now it has gotten a lot harder to panic the system. If  
> I plug or unplug the USB drive slowly, I get the usual connect/ 
> disconnect messages and no panic. Only when I connect and then  
> around 3 s later unplug, I get a panic. This is while the connect  
> message comes by on the screen. (Ok, maybe I'm asking for it at that  
> point.)
>
> How could the inclusion of DDB/GDB affect the USB subsystem? Some  
> odd timing problem? (And still no way to create a crashdump...)

Memory corruption: by adding or removing options, you change the kernel
itself as well as its behaviour. This can change where in the kernel
the corruption happens and what sub-systems are being affected.

See if some other options have the same effect...

-- 
Marcel Moolenaar
xcllnt at mac.com