I'm specifically interested in the case of kernel modules that instantiate new syscalls.

How much support do we have for that? In the one example in our sources of a kld with a syscall (kgssapi.ko) dtrace seems to find regular function entrypoints but not the syscall.

root@porridge:/usr/src # dtrace -n ":kgssapi::entry {}"
dtrace: description ':kgssapi::entry ' matched 138 probes

root@porridge:/usr/src # dtrace -n "syscall:kgssapi::entry {}"
dtrace: invalid probe specifier syscall:kgssapi::entry {}: probe description syscall:kgssapi::entry does not match any probes
root@porridge:/usr/src #

Do we have plans to support dynamic syscall support?

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