samba - Aug 2008 - pam mounted shares unmount themselves after a while, sorta

Hello all,

 

I have a samba PDC and about 20 linux clients.  The linux clients
authenticate to the PDC via pam_winbind and mount a share automatically
at login via pam_mount.

 

The problem is that client-side the shares seem to get into a bad state
after a while (like a day).  The share does not show up when I run df,
but it still seems to be partially mounted.   I say "partially
mounted"
because I can run smbumount on the share and I don't get an error.
After I run smbumount, I can logout/login and the automatic mounting via
pam_mount will work.

 

This problem may be partially due to our less than perfect network.  

 

Does anyone have this problem, and is there a workaround?