Prex -k panic after my driver has been loaded

I'm developing a pseudo-driver on Solaris 7:
SunOS swucp191 5.7 Generic_106541-10 sun4u sparc SUNW,Ultra-4
I can use add_drv and use the driver just fine. If I happen to issue:
prex -k
to start a kernel tnf trace, my box panics. My driver is not invoked at the time prex runs. It does not reference any tnf symbols either ("nm <module> | grep tnf"). I suspect prex is re-checking a list of probe symbols declared by modules in the kernel and dmesg says:
BAD TRAP occurred in module "tnf" due to a NULL pointer dereference
I did a search on this site and found a similar problem mentioned at
http://access1.sun.com/patch.public/cgi-bin/readme2html.cgi?patch=107280
which includes the following:
Problem Description:
4329645 Workaround for byte hole problem on Everest card.
4329671 Boot failure when an FC is a boot device.
4333114 System panics due to NULL pointer dereference in the
ifp module.
(from 107280-05)
4245927 Qlogic f/w fails get_port_database command on LIP
4284022 drives attached to ancor switch can not be seen on
pci contorller.
4259422 ifp FCAL - luxadm reserve on one host, other host
when rebooted can't see
4248639 ifp: prex -k panic system (after ifp driver module is
unloaded)
That last one there - 4248639 - sounds like my problem. Hopefully my driver messed something up just like the "ifp" module did. Can anybody tell me what the code change for "ifp" was that fixed this problem?
Thanks.

I've learned that there is a Solaris 7 bug that causes this panic. I've tested my driver on Solaris 8 (bug fixed) and no panic occurs.

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