Date: Mon, 10 May 1999 12:11:28 -0700 From: Cy Schubert <cschuber@uumail.gov.bc.ca> To: Mike Tancsa <mike@sentex.net> Cc: freebsd-stable@freebsd.org Subject: Re: Strange reboot saga Message-ID: <199905101912.MAA34150@passer.osg.gov.bc.ca> In-Reply-To: Your message of "Sun, 09 May 1999 17:47:57 EDT." <4.1.19990509174640.0534ef10@granite.sentex.ca>
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I remember trying this exploit about a month ago when it was first
announced. It locked the system up solid within seconds. After
applying the patches from PR 8416 I currently have four copies of
find and one tripwire running for over an hour and a half, with no
hang. The patches from PR 8416 appear to have fixed the hang.
Regards, Phone: (250)387-8437
Cy Schubert Fax: (250)387-5766
Open Systems Group Internet: Cy.Schubert@uumail.gov.bc.ca
ITSD Cy.Schubert@gems8.gov.bc.ca
Province of BC
"e**(i*pi)+1=0"
In message <4.1.19990509174640.0534ef10@granite.sentex.ca>, Mike
Tancsa writes:
> At 05:05 PM 5/9/99 , Cy Schubert - ITSD Open Systems Group wrote:
> >
> >In message <19990507220718.B31932@relay.ucb.crimea.ua>, Ruslan Ermilov
> >writes:
> >> Just FYI:
> >>
> >> $ uname -r; uptime
> >> 2.2.1-RELEASE
> >> 10:02PM up 115 days, 5:57, 1 user, load averages: 0.00, 0.09, 0.14
> >> (last reboot was due to <Ctrl-Alt-Del>)
> >>
> >> $ uname -r; uptime
> >> 3.1-STABLE
> >> 10:02PM up 8 days, 11:07, 6 users, load averages: 0.27, 0.17, 0.11
> >> (last reboot was due to system freeze)
> >
> >You know the strange thing about these freezes is that they don't occur
> >on every system. For example, I manage four 3.1R systems and a 2.2.8R
> >system. Three of the 3.1 systems are rock solid. The fourth one,
> >which also happens to have the fastest clock speed (333MHz PII in a
> >Dell), has frozen four times since February while I was running
> >tripwire 1.3 with -interactive, during phase 4 file checks, and
> >starting netscape, and restoring exmh2 from an icon. The system is
> >doing A LOT of paging at the time of the hangs. PR 8416 might hold
> >some promise of fixing this.
>
> Perhaps its related to the mmap bug.. I think I have been hit by it once on
> one of my systems...
>
> e.g.
> find / -type f -exec grep zztop "{}" \; &
> find / -type f -exec grep zztop "{}" \; &
>
> will lock a 3.x box solid.
>
> ---Mike
> **********************************************************************
> Mike Tancsa, Network Admin * mike@sentex.net
> Sentex Communications Corp, * http://www.sentex.net/mike
> Cambridge, Ontario * 01.519.651.3400
> Canada *
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