https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193109

--- Comment #2 from Mark Johnston <[email protected]> ---
(In reply to Mark Johnston from comment #1)
> This type of error is almost always the result of some sort of
> misconfiguration. A couple of things to check:
> 
> 1. Is kern.bootfile set to the correct path for the running kernel?
> 2. Is there CTF data present in the kernel?

The latter can be checked with something like 'ctfdump /boot/kernel/kernel'.

If nothing interesting turns up, try running a dtrace command manually on the
system in question, e.g. "dtrace -n 'fbt::kern_ioctl:entry'" or so. If it fails
with the same error, try running it again with the DTRACE_DEBUG environment
variable set to 1 and paste the output.

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