Re: How to take down a system to the point of requiring a newfs with one line of C (userland)

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
_______________________________________________
freebsd-securityfreebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-secu
rity
To unsubscribe, send any mail to
"freebsd-security-unsubscribefreebsd.org"

Wesley Shields wrote:
> 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.

I'm also unable to reproduce this on an 8.0 machine.  The
original 
poster needs to follow up with the panic backtrace so we can
attempt to 
understand his problem.

Kris
_______________________________________________
freebsd-securityfreebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-secu
rity
To unsubscribe, send any mail to
"freebsd-security-unsubscribefreebsd.org"