Date: Mon, 9 Oct 1995 08:59:58 -0400 From: Mark Starner <starner@clark.net> To: "'J Wunsch'" <j@uriah.heep.sax.de>, Mark Starner <starner@clark.net> Cc: "bugs@freebsd.org" <bugs@freebsd.org>, "moriya@ifi.unicamp.br" <moriya@ifi.unicamp.br> Subject: RE: Bug accessing /dev/cd1 Message-ID: <01BA9625.9D140040@ras2.HAN.UnisysGSG.COM>
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Yes, I tracked it down with nm and it is the same place (the bp = bh->lh_first; instruction)
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From: J Wunsch[SMTP:j@uriah.heep.sax.de]
Sent: Sunday, October 08, 1995 11:15 PM
To: Mark Starner
Cc: bugs@freebsd.org; moriya@ifi.unicamp.br
Subject: Re: Bug accessing /dev/cd1
As Mark Starner wrote:
>
> Fatal trap 12: page fault while in kernel mode
>
> fault virtual address = 0x10a
> fault code = supervisor read, page not present
> instruction pointer = 0x8:0xf011efdc
> code segment = base 0x0, limit 0xfffff, type 0x1b
> processor eflags = interrupt enabled, resume IOPL=0
> current process = 133(cat)
> interrupt mask = bio
> panic: page fault
>
> syncing disks..................... 4 4 4 4 4 4 4 4 4 giving up
> Automaitc reboot in 15 seconds - press a key on the console to abort
>
> -------
>
> Is it easy to repair ?
Unfortunately not. :-(
I know only of two people where this happens: you, and Hellmuth
Michaelis (but i believe it's a CD changer for him). I seem to
remember that there's been another report from someone with two CDs,
it happened for the second drive for him.
I know of at least one person reliably operating a six-CD
configuration under 2.0.5. This basically proves that it's not simply
the _amount_ of CD drives available; it must be something else.
You forgot to attach the appropriate part of your kernel's name list
to your message, but i assume it's still the same. (It's also been
the same spot in function incore() for Hellmuth Michaelis.)
I guess I have to convince somebody of you to track it down with
DDB...
> The bug happens in line 694 of vfs_bio.c:
>
> 686 incore(struct vnode * vp, daddr_t blkno)
> 687 {
> 688 struct buf *bp;
> 689 struct bufhashhdr *bh;
> 690
> 691 int s = splbio();
> 692
> 693 bh = BUFHASH(vp, blkno);
> 694 bp = bh->lh_first;
> ^^^^
Yeah, well, anybody out there who understands the BUFHASH() macro???
--
cheers, J"org
joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)
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