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recent panics: uvm?

I've been getting some panics from -current over the last couple
of days.
panic: kernel diagnostic assertion "deadentry == &ukh->ukh_entries[0]" failed: 
file "../../../../uvm/uvm_map.c", line 4824
panic: kernel diagnostic assertion "object != NULL" failed: file 
"../../../../kern/subr_pool.c", line 2624

For the first I now have a manually created coredump (wasn't savecore
supposed to have been fixed?)  Any interesting structs to look at in


(gdb) bt
#0  cpu_reboot (howto=260, bootstr=0x0) at 
#1  0xc03130c4 in panic (fmt=0xc050b170 "kernel %sassertion \"%s\" failed: file 
\"%s\", line %d") at ../../../../kern/subr_prf.c:296
#2  0xc041115e in __kernassert (t=0xc04b94e5 "diagnostic ", f=0xc05001ac 
"../../../../uvm/uvm_map.c", l=4824, e=0xc0500ee8 "deadentry == 
    at ../../../../../../lib/libkern/__assert.c:50
#3  0xc03a74e8 in uvm_kmapent_free (entry=0xdc024164) at 
#4  0xc03a761a in uvm_unmap_detach (first_entry=0xdc024164, flags=0) at 
#5  0xc03a9fb1 in uvm_unmap1 (map=0xc056d780, start=3564896256, end=3564961792, 
flags=41943040) at ../../../../uvm/uvm_map.c:5304
#6  0xc03b8c7c in bufpool_page_free (pp=0xc056e6ec, v=0xd47c0000) at 
#7  0xc030dc4e in pool_allocator_free (pp=0x0, v=0x0) at 
#8  0xc030fb91 in pr_pagelist_free (pp=0xc056e6ec, pq=0xd07e77cc) at 
#9  0xc030ef70 in pool_put (pp=0xc056e6ec, v=0xd47c0000) at 
#10 0xc03b72ab in buf_mrelease (addr=0xd47c0000, size=<value optimized out>) at 
#11 0xc03b8454 in allocbuf (bp=0xc4036bb0, size=2048, preserve=0) at 
#12 0xc03b99df in getblk (vp=0xdd0ce0b8, blkno=0, size=2048, slpflag=0, 
slptimeo=0) at ../../../../kern/vfs_bio.c:1199
#13 0xc03b9b5e in bio_doread (vp=0xdd0ce0b8, blkno=0, size=2048, 
cred=0xffffffff, async=0) at ../../../../kern/vfs_bio.c:659
#14 0xc03b9c81 in breadn (vp=0xdd0ce0b8, blkno=0, size=2048, rablks=0xd05bf1e0, 
rasizes=0xd0797600, nrablks=0, cred=0xffffffff, flags=0, bpp=0xd07e7968)
    at ../../../../kern/vfs_bio.c:739
#15 0xc0359ca3 in ufs_blkatoff (vp=0xdd0ce0b8, offset=0, res=0x0, 
bpp=0xd07e7a48, modify=false) at ../../../../ufs/ufs/ufs_lookup.c:1294
#16 0xc035ad62 in ufs_lookup (v=0xd07e7a74) at 
#17 0xc03d8cbd in VOP_LOOKUP (dvp=0xdd0ce0b8, vpp=0xd07e7c04, cnp=0xd07e7c18) 
at ../../../../kern/vnode_if.c:130
#18 0xc03be88c in lookup (ndp=0xd07e7bf0) at ../../../../kern/vfs_lookup.c:903
#19 0xc03bf038 in namei (ndp=0xd07e7bf0) at ../../../../kern/vfs_lookup.c:549
#20 0xc03c75c8 in do_sys_stat (path=0xbb7ae080 <Address 0xbb7ae080 out of 
bounds>, nd_flags=64, sb=0xd07e7c58) at ../../../../kern/vfs_syscalls.c:2381
#21 0xc03c765f in sys___stat50 (l=0xd07492c0, uap=0xd07e7d00, 
retval=0xd07e7d28) at ../../../../kern/vfs_syscalls.c:2403
#22 0xc0323164 in syscall (frame=0xd07e7d48) at ../../../../sys/syscallvar.h:61
#23 0xc010056e in syscall1 ()

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