Date: Tue, 17 Nov 1998 12:00:02 -0800 (PST) From: Cy Schubert <cschuber@uumail.gov.bc.ca> To: freebsd-bugs@FreeBSD.ORG Subject: Re: kern/5355: Fix for NULLFS problems Message-ID: <199811172000.MAA00646@freefall.freebsd.org>
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The following reply was made to PR kern/5355; it has been noted by GNATS.
From: Cy Schubert <cschuber@uumail.gov.bc.ca>
To: "Vladimir B. Grebenschikov" <vova@plugcom.ru>
Cc: freebsd-gnats-submit@freebsd.org, cschuber@uumail.gov.bc.ca,
bde@zeta.org.au
Subject: Re: kern/5355: Fix for NULLFS problems
Date: Tue, 17 Nov 1998 11:53:23 -0800
You may want to try Bruce Evans' patch discussed in the PR under 3.0.
My patch has only been tested on -stable.
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
Government of BC
In message <3651B1DE.3D5F4E0C@plugcom.ru>, "Vladimir B. Grebenschikov"
writes:
>
> It is not full workable fix :(
>
> # uname -a
> FreeBSD ds.express.ru 3.0-980520-SNAP FreeBSD 3.0-980520-SNAP #5: Thu
> Nov 5 23:22:39 MSK 1998 vova@ds.express.ru:/usr/src/sys/compile/DS
> i386
>
> # mount -t null /home/ntmdt /users/home/ntmdt
> # cd /users/home/ntmdt
> # ls -ldi . WWW.access.log
> 844906 drwxr-xr-x 32 ntmdt ntmdt 3072 Nov 17 06:00 .
> 846338 -rw-r--r-- 1 ntmdt ntmdt 116345 Nov 17 19:57 WWW.access.log
> # tail -f WWW.access.log
> // normal web log output here
> // ...
> // trying another user
> # umount /home/ntmdt
> # mount -t null /home/aqwamdt /users/home/aqwamdt
> # cd /users/home/aqwamdt
> # ls -ldi . WWW.access.log
> 906380 drwxr-x--- 4 aqwamdt aqwamdt 512 Feb 7 1998 .
> 906387 -rw-r----- 1 root aqwamdt 46672 Mar 30 1998 WWW.access.log
> # tail -f WWW.access.log
>
> // on console imideatly appears:
> Fatal trap 12: page fault while in kernel mode
> fault virtual address = 0x40
> fault code = supervisor read, page not present
> instruction pointer = 0x8:0xf01779d9
> stack pointer = 0x10:0xf7021ce0
> frame pointer = 0x10:0xf7021dbc
> code segment = base 0x0, limit 0xfffff, type 0x1b
> = DPL 0, pres 1, def32 1, gran 1
> processor eflags = interrupt enabled, resume, IOPL = 0
> current process = 3648 (tail)
> interrupt mask =
> trap number = 12
> panic: page fault
>
> // 100% repeating
> // when ... when nullfs will work ????
>
> more:
>
> # md /users
> # cat bin.?? | tar -xpzf - -C /users
> # cp -p /usr/local/bin/perl /users/usr/local/bin
> # mount -t null /usr/local/lib/perl5 /users/usr/local/lib/perl5
> # chroot /users
> # perl
> use strict;
> ^D
> #
> # perl
> use stict;
> use Net::Ping;
> ^D
> ... PAGE fault in kernel ... current process: perl
>
>
> --
>
> Plug Communication ISP, Moscow
> Vladimir B. Grebenschikov, vova@plugcom.ru, 2:5020/302@fidonet.org
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