killing process reading from mounted share breaks mount

[David Wuertele]

I have an embedded linux-2.0.28 system that uses smbmount from
samba-3.0.6.

I use "smbmount" to mount a share, then run an application that reads
from files on that share.  If that app crashes, or if I kill it with
SIGKILL, the mounted directory is no longer listable:

  # ls /mnt/smb/rave/share
  5nave-hda2.img    greetings.jpg     inittab           
  configure-bridge  hss               music
  efss              ifdown.1          online-upgrade
  # kill -9 900
  # ls /mnt/smb/rave/share
  smb_retry: signal failed, error=-3
  ls: /mnt/smb/rave/share: Input/output error
  # 

What might be causing this behavior?

Thanks,
Dave