Re: How to take down a system to the point of requiring a newfs with one line of C (userland)
- From: Wesley Shields <wxs@xxxxxxxxxxx>
- Date: Mon, 18 Feb 2008 10:07:48 -0500
On Tue, Feb 19, 2008 at 01:14:08AM +1100, Mark Andrews wrote:
Patient: Doctor, it hurts when I do this!
Doctor: Don't do that...
Did you actually bother to read his report?
While his example is used "/", if the report is correct then you
just need to replace "/" with the path of any file system mount
point that is world writable like say "/tmp".
Do you have /tmp mounted like this?
/dev/ad0s4e 507630 162050 304970 35% /tmp
Have you tried using "/tmp" or some other suitable mount point
before slinging off with the old Doctor joke?
Even if it is only "/", having the system die and not be recoverable
due to having a excessive number of files in "/" is a critical
error. I'm sure you have *never* accidently copied a set of files
to "/" in your life. Me, I know I've made that sort of mistake in
the past, and as I'm not perfect, I'm sure I'll make that sort of
mistake at some point in the future. I would however like the
machine not to fallover when I do make that mistake.
Now why don't you be constructive and verify whether the report is
valid or not. I don't have a spare machine to test it on so I'm
not going to attempt it.
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?
-- WXS
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