On 2021-05-04, Why 42? The lists account. <lists@y42.org> wrote:
>
> On Mon, May 03, 2021 at 12:59:27AM +0200, Patrick Wildt wrote:
>> > ...
>> > But when I do (as root): "sysctl kern.allowdt=1" it returns this error:
>> > sysctl: kern.allowdt: Operation not permitted
>>
>> Similarly to kern.allowkmem, you can only set it when the securelevel is
>> still 'low'. That's for security. You need to add kern.allowdt=1 to
>> sysctl.conf, and then reboot. Then it'll be enabled after reboot.
>
> Thanks Patrick! After the reboot I was able to experiment with btrace.
>
> Do you use it, do you have any examples that might help to get started?
Here's one example:
https://marc.info/?l=openbsd-bugs&m=158583371404603&w=2
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