On Tue, Apr 24, 2007 at 09:50:02PM +0000, Mark Davies wrote:
> The following reply was made to PR kern/36196; it has been noted by GNATS.
> 
> From: Mark Davies <mark@mcs.vuw.ac.nz>
> To: gnats-bugs@netbsd.org
> Cc: 
> Subject: Re: kern/36196 (supervisor trap with linux df)
> Date: Wed, 25 Apr 2007 09:49:01 +1200
> 
>  On Tuesday 24 April 2007, Nicolas Joly wrote:
>  >  >  I tried current and it didn't crash but it also didn't work,
>  >  > just printed out:
>  >  >
>  >  >  /emul/linux/bin/df: cannot read table of mounted file systems:
>  >  > No such file or directory
>  >  >
>  >  >  Presumably something to do with the /emul namei changes.
>  
>  >  No. df require `/emul/linux/proc' to be mounted, because of
>  >  `/emul/linux/etc/mtab'.
>  
>  I have /proc mounted with the linux option and /emul/linux/etc/mtab is 
>  a symlink pointing at "/proc/mounts".  This used to work before the 
>  namei changes and clearly doesn't now.  Is that a bug in the changes 
>  or do I _have_ to mount proc twice now.  What other situations will 
>  this hit?

I spoke a little too soon ... I do see the problem with your case,
mine does not.

Old:
 21221      1 df       CALL  open(0x8050472,0,0x1b6)
 21221      1 df       NAMI  "/emul/linux/etc/mtab"
 21221      1 df       NAMI  "/emul/linux"
 21221      1 df       NAMI  "/emul/linux/etc/mtab"
 21221      1 df       RET   open 3

New:
  1372      1 df       CALL  open(0x8050472,0,0x1b6)
  1372      1 df       NAMI  "/etc/mtab"
  1372      1 df       NAMI  "/etc/mtab"
  1372      1 df       RET   open -1 errno -2 No such file or directory

-- 
Nicolas Joly

Biological Software and Databanks.
Institut Pasteur, Paris.