CURRENT: frequent crashes if mpd5 is running

 I'm experiencing frequent CURRENT ( 12.0-CURRENT r302535 amd64 ) crashes 
triggered by mpd5:

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x10
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff814f6162
stack pointer           = 0x28:0xfffffe011b06d640
frame pointer           = 0x28:0xfffffe011b06d670
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         = 901 (mpd5)
trap number             = 12
panic: page fault
cpuid = 0

#0  doadump (textdump=<value optimized out>) at pcpu.h:221
221     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) #0  doadump (textdump=<value optimized out>) at pcpu.h:221
#1  0xffffffff80749169 in kern_reboot (howto=260)
    at ../../../kern/kern_shutdown.c:366
#2  0xffffffff807496e1 in vpanic (fmt=<value optimized out>,
    ap=<value optimized out>) at ../../../kern/kern_shutdown.c:759
#3  0xffffffff80749553 in panic (fmt=0x0) at ../../../kern/kern_shutdown.c:690
#4  0xffffffff80a5aca1 in trap_fatal (frame=0xfffffe011b06d590, eva=16)
    at ../../../amd64/amd64/trap.c:841
#5  0xffffffff80a5af51 in trap_pfault (frame=0x0, usermode=0)
    at ../../../amd64/amd64/trap.c:716
#6  0xffffffff80a5a430 in trap (frame=0xfffffe011b06d590)
    at ../../../amd64/amd64/trap.c:442
#7  0xffffffff80a3e161 in calltrap () at ../../../amd64/amd64/exception.S:236
#8  0xffffffff814f6162 in ng_uncallout (c=0xfffff80004842460,
    node=0xfffff80004c79a00)
    at /usr/src/sys/modules/netgraph/netgraph/../../../netgraph/ng_base.c:3815
#9  0xffffffff8151bbab in ng_pptpgre_disconnect (hook=<value optimized out>)
    at 
/usr/src/sys/modules/netgraph/pptpgre/../../../netgraph/ng_pptpgre.c:966
#10 0xffffffff814f2928 in ng_destroy_hook (hook=0xfffff8000487ad80)
    at /usr/src/sys/modules/netgraph/netgraph/../../../netgraph/ng_base.c:1219
#11 0xffffffff814f2635 in ng_rmnode (node=<value optimized out>,
    dummy1=<value optimized out>, dummy2=<value optimized out>,
    dummy3=<value optimized out>)
    at /usr/src/sys/modules/netgraph/netgraph/../../../netgraph/ng_base.c:744
#12 0xffffffff814f4832 in ng_apply_item (node=0xfffff80004c79a00,
    item=0xfffff80004e72600, rw=1)
    at /usr/src/sys/modules/netgraph/netgraph/../../../netgraph/ng_base.c:2523
#13 0xffffffff814f41a3 in ng_snd_item (item=<value optimized out>,
    flags=<value optimized out>)
    at /usr/src/sys/modules/netgraph/netgraph/../../../netgraph/ng_base.c:2320
#14 0xffffffff814eec4e in ngc_send (so=<value optimized out>,
    flags=<value optimized out>, m=<value optimized out>,
    addr=<value optimized out>, control=<value optimized out>,
    td=<value optimized out>)
    at /usr/src/sys/modules/netgraph/socket/../../../netgraph/ng_socket.c:338
#15 0xffffffff807dee17 in sosend_generic (so=<value optimized out>,
    addr=<value optimized out>, uio=<value optimized out>,
    top=<value optimized out>, control=<value optimized out>,
    flags=<value optimized out>, td=<value optimized out>)
    at ../../../kern/uipc_socket.c:1359
#16 0xffffffff807e66b8 in kern_sendit (td=<value optimized out>,
    s=<value optimized out>, mp=<value optimized out>, flags=0, control=0x0,
    segflg=<value optimized out>) at ../../../kern/uipc_syscalls.c:848
#17 0xffffffff807e6abf in sendit (td=0xfffff800047caa00,
    s=<value optimized out>, mp=0xfffffe011b06da60,
    flags=<value optimized out>) at ../../../kern/uipc_syscalls.c:775
#18 0xffffffff807e690d in sys_sendto (td=0x0, uap=<value optimized out>)
    at ../../../kern/uipc_syscalls.c:899
#19 0xffffffff80a5b618 in amd64_syscall (td=<value optimized out>, traced=0)
    at subr_syscall.c:135
#20 0xffffffff80a3e44b in Xfast_syscall ()
    at ../../../amd64/amd64/exception.S:396
#21 0x00000008025d284a in ?? ()
Previous frame inner to this frame (corrupt stack?)
Current language:  auto; currently minimal