How to take down a system to the point of requiring a newfs
with one line of C (userland)
Wesley Shields
wxs at FreeBSD.org
Mon Feb 18 10:37:20 PST 2008
On Mon, Feb 18, 2008 at 07:21:55PM +0100, Volker wrote:
> On 02/18/08 19:04, Wesley Shields wrote:
> > On Mon, Feb 18, 2008 at 09:25:29AM -0800, Peter Sanchez wrote:
> >> On Feb 18, 2008, at 7:07 AM, Wesley Shields wrote:
> >>> I tried this using /tmp/ as argv[1] and it didn't crash a 6.2 machine or
> >>> a -current from a few weeks ago. Maybe the number of files has to be
> >>> increased? I bumped it up to 100000 and tried on a 6.2 machine, but I
> >>> ran out of inodes before I could induce a crash. :)
> >>>
> >>> Maybe I'm doing something wrong?
> >> I believe the panic doesn't occur until boot. Did you reboot the box after
> >> writing the files to /tmp?
> >>
> >> Peter
> >
> > I did on a 6.2 machine with 10000 files in /tmp. I can reboot the
> > -current machine later tonight if you think it will make a difference.
>
> According to the problem report, it should panic while mounting the fs.
> umount and re-mount /tmp and see, if you can make it panic (a reboot
> shouldn't be necessary here).
I did exactly that and it did not panic on both a 6.2 and -current
machine.
Just to be sure, I did reboot a 6.2 machine with 10000 0-byte files in
/tmp and it didn't panic.
-- WXS
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