Subject: Re: kern/21404: new kernel breaks file system for old kernels
To: None <>
From: Manuel Bouyer <>
List: netbsd-bugs
Date: 04/30/2003 20:13:18
On Wed, Apr 30, 2003 at 10:41:49PM +1000, wrote:
> System: NetBSD 1.6R NetBSD 1.6R (_fish_) #134: Tue Apr 29 13:06:57 EST 2003 i386
> Architecture: i386
> Machine: i386
> >Description:
> 	i had been running 1.6L (just prior to SA's) on my laptop for the
> 	past 3.5 months, and decided it was time to update.  i built a new
> 	kernel after updating my config file, and booted the new kernel..
> 	it came up multiuser but i had somehow managed to comment npx@isa
> 	so many programs dumped core.  i then logged in on the console,
> 	and rebooted the old kernel.  at this point i lost.  while i was
> 	able to load the kernel and it was able to mountroot, it failed
> 	to check /dev/console and exec /sbin/init with ENOTDIR.  after i
> 	found a (1.5) bootable cdrom lying around, i was able to boot up
> 	and run an old "fsck".  it complained about the superblock being
> 	broken and needed a "fsck_ffs -b 32" to fix my file systems (not
> 	just root, but all of them.)
> 	this is extremely broken.  i don't know what exactly had happened
> 	to my filesystems, but simply booting a new kernel and then going
> 	back to the old one not working is unacceptable!  i fear what damage
> 	would be done to non-netbsd UFS filesystems.

See also kern/21283

Manuel Bouyer <>
     NetBSD: 24 ans d'experience feront toujours la difference