Alexander Viro wrote:
> 
> On Fri, 23 Apr 1999, Manfred Spraul wrote:
> 
> > i'm currently tracking a bug in VFS.
> > (Please HELP-thread).
> >
> > My first impression is that:
> > 1) sys_lseek() is called
> > 2) file->f_dentry == NULL, i.e. goto out_putf
> Stop here.
> 
> > My question(s):
> > a) when is file->f_dentry==NULL?
> 
> When we got a bug. It should never happen. Can you reproduce the
> situation?

No I can't.
But I think that fput() should handle that situation without 
crashing.

I figured out some more details:
sys_lseek():
 * calls fget()
 * ...
 * calls fput()
 * fput() notices file->f_count==0!
   otherwise it would not call locks_remove_flock().

This means there must be an bad entry in 
files->fd[].
get_unused_fd() [in fs/open.c] contains a sanity check for
that case. Do you know why that check was added?

Regards,
	Manfred


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