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Re: NetBSD 7.0 i386 panic during boot

On Tue, Oct 13, 2015 at 05:24:31PM +0530, Mayuresh wrote:
> On Sun, Oct 11, 2015 at 01:13:42PM -0400, Christos Zoulas wrote:
> > | > This looks like a NULL pointer dereference. Do you have a backtrace?
> > | 
> > | Unfortunately the keyboard stops working when db prompt appears. So cannot
> > | gather complete trace.
> > 
> > Compile a kernel with
> > options DDB_ONPANIC 2
> > (man 4 options)
> Did just that, make depend and make. Copied the kernel to bootable USB and
> tried to boot from it. Get the panic error but not stack trace.

On a healthy system I tried triggering ddb with above kernel (with
DDB_ONPANIC set), with Ctrl-Alt-Esc. It did not print trace.

To cross check that the option is effective I did this:

$sysctl ddb.onpanic
ddb.onpanic = 2

Also commented out the following line in /etc/sysctl.conf as below to
ensure that it is not overriding the compiled option.

So looks like my procedure was alright. Is there anything else needed to
make kernel print trace on entering ddb, when keyboard can't be used?


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