unmounting nfs mount causes OOPS, 2.4.19-pre4

Linux James.kalifornia.com 2.4.19-pre4 #6 Tue Mar 26 13:00:10 EST 2002 i686 unknown
mount: mount-2.11n
hotmale:/usr/local/apache/virtuals /usr/local/virtuals nfs defaults,rsize=8192,wsize=8192 0 0

Note: this is sporadic, it doesn't happen every time.

kernel BUG at inode.c:513!

invalid operand: 0000
CPU:    0
EIP:    0010:[<c0147e88>]    Not tainted

Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010286
eax: 0000001b ebx: c6e32864 ecx: c0432cbc edx: 000030ba
esi: c7505f34 edi: c7505f34 ebp: 08052428 esp: c7505f00
ds: 0018 es: 0018 ss: 0018
Process umount (pid: 2004, stackpage=c7505000)

Stack: c0391ca0 00000201 c6e32864 c7505f34 c7505f34 c0147faf c6e32864 c0147fb8
      c6e32864 00000000 c2169060 c01480e5 c7505f34 c6e32bfc c232818c 
c7505f34
      c7505f34 c2169000 c7d303d0 c0437dc0 c013a0d5 c2169000 c7505f88 
c1165544
Call Trace: [<c0147faf>] [<c0147fb8>] [<c01480e5>] [<c013a0d5>] [<c013df98>]
  [<c014a471>] [<c0134acf>] [<c014a4cc>] [<c0106deb>]
Code: 0f 0b 58 5a 8b 83 f8 00 00 00 a9 10 00 00 00 0f 84 bb 00 00

Trace; c0147faf <dispose_list+2f/50>
Trace; c0147fb8 <dispose_list+38/50>
Trace; c01480e5 <invalidate_inodes+65/70>
Trace; c013a0d5 <kill_super+85/e0>
Trace; c013df98 <path_release+28/30>
Trace; c014a471 <sys_umount+71/c0>
Trace; c0134acf <filp_close+3f/60>
Trace; c014a4cc <sys_oldumount+c/10>
Trace; c0106deb <system_call+33/38>
Code; c0147e88 <clear_inode+28/120>
00000000 <_EIP>:

Code;  c0147e88 <clear_inode+28/120>   <=====
  0:   0f 0b                     ud2a      <=====
Code;  c0147e8a <clear_inode+2a/120>
  2:   58                        pop    %eax
Code;  c0147e8b <clear_inode+2b/120>
  3:   5a                        pop    %edx
Code;  c0147e8c <clear_inode+2c/120>
  4:   8b 83 f8 00 00 00         mov    0xf8(%ebx),%eax
Code;  c0147e92 <clear_inode+32/120>
  a:   a9 10 00 00 00            test   $0x10,%eax
Code;  c0147e97 <clear_inode+37/120>
  f:   0f 84 bb 00 00 00         je     d0 <_EIP+0xd0> c0147f58 

<clear_inode+f8/120>