Re: panic: ffs_blkfree: freeing free block

On Saturday 10 November 2007, Pieter de Goeje wrote:
On Friday 09 November 2007, Kostik Belousov wrote:
On Fri, Nov 09, 2007 at 01:04:44PM +0100, Pieter de Goeje wrote:
Is anyone who had been able to trigger this panic still having
problems with recent kernels (and soft updates turned on)? I've
checked with a few people who had been experiencing the panic and
they can no longer trigger it.

It's at least a tiny bit possible some of the VM fixes that have gone
in addressed this problem. We'd like to find out if anyone can still
trigger this.

I can no longer reproduce it any more.

Could anybody who was able to trigger the panic with relative ease, do
the binary search for the dates that
A. started the problem
B. eliminated it

There is uneasy feeling for the bug that did such appearance and still
not tracked.

Doing a binary search now. Might take some time though.
This commit to sys/vm/vm_object.c fixed it:

revision 1.386
date: 2007/10/18 23:02:18; author: alc; state: Exp; lines: +2 -1
The previous revision, updating vm_object_page_remove() for the new page
cache, did not account for the case where the vm object has nothing but
cached pages.

Reported by: kris, tegge
Reviewed by: tegge

If you want I can still do a search for the commit that introduced the
problem, but I think this gives a rather strong clue on what caused it :)

Pieter de Goeje
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