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Re: kern/37955: Kernel Panic NetBSD 4.0 blkfree
On Wed, Mar 05, 2008 at 12:00:05PM +0000, Vincent van den Berg wrote:
> From: Vincent van den Berg <vincent%mijnpostvak.in@localhost>
> To: gnats-bugs%NetBSD.org@localhost
> Subject: Re: kern/37955: Kernel Panic NetBSD 4.0 blkfree
> Date: Wed, 05 Mar 2008 12:56:59 +0100
> It just happened again, with a clean file system while using rsnapshot!
> I think this is a serious bug.
Just to check, when you say clean, you mean like this, right?
# fsck -f /dev/rwd0f
** File system is already clean
** Last mounted on /scratch
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
1 files, 1 used, 253998 free (14 frags, 31748 blocks, 0.0% fragmentation)
That is, it fscks cleanly, rather than merely this:
# fsck /dev/rwd0f
** File system is clean; not checking
because the clean bit in the superblock only means the fs is correct
if there are no bugs in either the kernel or fsck. Which would be a
nice thing to be able to claim, but isn't true.
(And I believe if you mount a volume without fscking it and then
unmount it, it will subsequently purport to be clean, even though it
may in fact be nothing of the sort.)
David A. Holland
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