Date: Mon, 10 May 1999 15:19:33 -0400 From: Mike Tancsa <mike@sentex.net> To: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca> Cc: freebsd-stable@freebsd.org Subject: vm_fault deadlock and PR 8416 (was Re: Strange reboot saga ) Message-ID: <3.0.5.32.19990510151933.017f1b90@staff.sentex.ca> In-Reply-To: <199905101912.MAA34150@passer.osg.gov.bc.ca> References: <Your message of "Sun, 09 May 1999 17:47:57 EDT." <4.1.19990509174640.0534ef10@granite.sentex.ca>
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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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