Apple

(sorry, hit send accidentally).

For coredumps,

* you need debug flags to contain 0xd44 (or some smaller subset, but that's what I use, so I don't bother to go to a smaller set of flags)

* you need to specify the IP address of the server where you want to save the coredump in the "_panicd_ip" boot-args variable. If you are using the thunderbolt->firewire connection for two machine debugging, the coredump is always saved locally, but you still need to specify a _panicd_ip, even if it's not used.

sudo nvram boot-args="debug=0xd44 kdp_match_name=firewire fwkdp=0x8000 _panicd_ip=1.2.3.4"

sudo shutdown -r now

On the host, you need to issue these commands

sudo mkdir /PanicDumps

sudo chown root:wheel /PanicDumps

sudo chmod 1777 /PanicDumps

sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.kdumpd.plist

this sets up the kdumpd daemon to write coredump files to /PanicDumps.

Firewire behaves slightly differently; it writes the file to the home directory of the account which is doing the debugging. Mostly. Just look for the file.

On Wed, Jun 29, 2016 at 3:07 PM, Prokash Sinha <email@hidden> wrote:

Also I would love to know the exact combination of boot-args that will gen a core file as and when there is a kernel panic issued from kernel.

I was trying to do the following -

($) sudo -s
# nvram boot-args=“debug=0x404” //0x4 for using NMI, 0x400 for dump on panic

Not much happened in 10.11.

Thanks
-Prokash

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References:
	>Re: Debug related setup (From: Brian Bechtel <email@hidden>)