more zfs/nfs panics

[Danny Braniss]

Hi,
I'm trying to tar a rather big directory via nfs (some 800gb), it
has many subdirectories, some of them with many files (close to 10^6 :-)

just before the server panics, the tar (on the client) starts complaining 
about lost
files, or permition denied, but not in the pathological directories.
panic: kmem_malloc(-1661382656): kmem_map too small: 645009408 total allocated
cpuid = 3
KDB: enter: panic
[thread pid 881 tid 100112 ]
Stopped at      kdb_enter_why+0x3d:     movq    $0,0x5ef3e8(%rip)
db> tr
Tracing pid 881 tid 100112 td 0xffffff0004ba2000
kdb_enter_why() at kdb_enter_why+0x3d
panic() at panic+0x17b
kmem_malloc() at kmem_malloc+0x565
uma_large_malloc() at uma_large_malloc+0x4a
malloc() at malloc+0xd7
nfsrv_readdir() at nfsrv_readdir+0x4e1
nfssvc() at nfssvc+0x400
syscall() at syscall+0x1bb
Xfast_syscall() at Xfast_syscall+0xab
--- syscall (155, FreeBSD ELF64, nfssvc), rip = 0x8006885cc, rsp = 
0x7fffffffea28, rbp = 0 ---

I have increased 
	vm.kmem_size_max="1024M"
	vm.kmem_size="1024M"
	vfs.zfs.arc_max="800M"
it just seems to delay the panic though, it smells like some memory leak ...

the host is running amd64 quad core, 7.1-prerelease and 8GB.

danny