(Apologies for typos in advance, laptop panic'd)
This is with a 1.4Q snapshot.

First problem.

pmap_page_remove: unmanaged apge?
uvm_fault(0xf64c643c, 0x10000, 0, 3) -> 1
kernel: page fault trap, code=0

db>t
uvm_pagefree(f03c55bc) at uvm_pagefree+0x1a5
uvm_anfree(f641abe0) at uvm_anfree+0x5b
amap_wipeout(f64ac16c,f64cf3d4,f64cf3d4,0,f64c5ec4) at amap_wipeout+0x3b
amap_unref(f64cf3d4,0) at amap_unref+0x1a
uvm_unmap_detach(f64ab750,0,f64c643c,f64bedc8,f64ab750) at uvm_unmap_detach+0x21
uvm_unmap(f64c643c,0,efbfe000,f64c643c,f64c5f24) at uvm_unmap+0x9f
uvm_deallocate(f64c643c,0,efbfe000) at uvm_deallocate+0x38
exit1(f64bedc8,2100,f64c5fa8,f0211d9d,f64bedc8) at exit1+0x13c
sys_exit(f64bedc8,f64c5f88,f64c5f80,48208b10,ffffffff) at sys_exit+0x14
syscall() at syscall+0x1ed
--- syscall (number 1) ---

Second problem.
Compiling a -current kernel:

cc -O2 -Werror -Wall -Wmissing-prototypes -Wstrict-prototypes -Wnopointer-arith -Wno-main -I. -I../../../../arch -I../../../.. -nostdinc -I../../../../../crypto-intl/sys -I../../../../../gnu/sys -DLKM -DMAXUSERS=32 -D_KERNEL -Di386 -c ../../../../dev/wscons/wsemulconf.c
/usr/src/gnu/usr.bin/egcs/cc1/../../../dist/gcc/c-decl.c:4365: Internal compiler error in function grokdeclarator
-- wsdisplay.o --
/usr/src/gnu/usr.bin/egcs/common/../../../dist/gcc/stor-layout.c:218: Internal compiler error in function layout_decl

(then it panic'd - see above)