[Bug 249369] device dtrace and device dtraceall are incompatible with options ZFS

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249369

            Bug ID: 249369
           Summary: device dtrace and device dtraceall are incompatible
                    with options ZFS
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: Trond.Endrestol at ximalas.info

I have a custom kernel which specifies

device dtrace
device dtraceall

along with

options ZFS

While booting the custom kernel, amd64 r365792, I get this crash dump:

Fatal trap 12: page fault while in kernel mode
cpuid = 5; apic id = 0a
fault virtual address   = 0x7fffffff8
fault code              = supervisor write data, page not present
instruction pointer     = 0x20:0xffffffff8081c16b
stack pointer           = 0x28:0xfffffe000dffeb00
frame pointer           = 0x28:0xfffffe000dffeb80
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 0 (dtrace_taskq)
trap number             = 12
panic: page fault
cpuid = 5
time = 1
KDB: stack backtrace:
db_trace_self_wrapper() at
vpanic() at
panic() at
trap_fatal() at
trap_pfault() at
trap() at
calltrap() at
--- trap 0xc, rip = 0xffffffff8081c16b, rsp = 0xfffffe000dffeb00, rbp=
0xfffffe000dffeb80 ---
osd_set_reserved() at
taskqueue_thread_loop() at
fork_exit() at
fork_trampoline() at
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 0 tid 100109 ]
Stopped at
db>

Note: The keyboard is unresponsive at this point.

Is there a way to specify a dump device from loader(8)?

Disabling DTrace in the kernel config, both device dtrace and device dtraceall,
lets the kernel boot properly.
Specifying dtraceall_load="YES" in /boot/loader.conf compensates for the
missing in-kernel DTrace support.
BTW, is there a way of compiling and linking the systrace_freebsd32 module as
part of the monolithic kernel?

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