Date: Mon, 10 May 1999 13:17:35 -0700 (PDT) From: Cliff Skolnick <cliff@steam.com> To: Mike Tancsa <mike@sentex.net> Cc: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca>, freebsd-stable@FreeBSD.ORG Subject: Re: vm_fault deadlock and PR 8416 (was Re: Strange reboot saga ) Message-ID: <Pine.BSF.4.10.9905101316390.418-100000@lazlo.internal.steam.com> In-Reply-To: <3.0.5.32.19990510151933.017f1b90@staff.sentex.ca>
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It seems to have solved my deadlock problems. I'm running w/o it now, ready
to try to go into the debugger after the next lockup. I'm expecting it
within a few hours.
Cliff
On Mon, 10 May 1999, Mike Tancsa wrote:
> At 12:11 PM 5/10/99 -0700, Cy Schubert wrote:
> >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.
>
>
> That is most excellent... Is there any reason why this patch has not been
> applied to the tree ? i.e. does it have any adverse side effects
> preventing it from being committed ?
>
> ---Mike
>
>
> >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 Tancsa, tel 01.519.651.3400
> Network Administrator, mike@sentex.net
> Sentex Communications www.sentex.net
> Cambridge, Ontario Canada
>
>
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>
--
Cliff Skolnick | "They that can give up essential liberty to obtain
Steam Tunnel Operations | a little temporary safety deserve neither liberty
cliff@steam.com | nor safety."
http://www.steam.com/ | -- Benjamin Franklin, 1759
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