More on the blkfree panic

[Don Lewis]

On  2 May, I wrote:
> On  2 May, Scott A. Moberly wrote:
>> On Fri, May 02, 2003 at 01:43:34PM -0700, Don Lewis wrote:
>>> I haven't seen it on my 4/26 machine, though I haven't done anything
>>> disc intensive (other than the daily cron jobs) since then. The reports
>>> of this problem started showing up on 4/27, so I went hunting for
>>> commits during the likely window using cvs diff.  There were a number of
>>> vm locking changes made during that time, including some changes to
>>> vfs_bio.c.  That's about as close as anything came to touching the
>>> filesystem code.
>> 
>> Just to give a definate start point:
>> 
>> /Makefile.inc1/1.349/Fri May  2 18:26:15 2003//D2003.04.26.05.00.00
>> 
>> works fine.
> 
> Mine is somewhat newer than that, about 2003.04.27.02.00.00 UTC.  I just
> ran a buildworld and unpacked ports.tgz and didn't run into any
> problems.  I'll try stepping forward about 12 hours ...

Interesting ... I'm having problems reproducing this problem.

The first report of this bug landed in my inbox at about 15:12 UTC on
April 27.  Someone else who reported the bug claimed to have cvsup'ed at
about 10:00 UTC on that day.

I just did
	cvs -R update -Pd -D'4/27/2003 14:00:00 UTC'
	make buildworld
	make buildkernel
	make installkernel
and rebooted.

I haven't managed to trigger the problem with a simultaneous buildworld
and untaring ports.tgz.  I even suspected that this problem might be
triggered by free memory pressure so I added
	hw.physmem="128M"
to /boot/loader.conf and rebooted.  I've pushed the machine heavily into
paging, but it still seems to be stable, but painfully sluggish.

I just did a cvs diff, and the only change between 14:00 UTC and 16:00
UTC is a patch to if_wi.c.