Date: Sun, 06 Oct 2002 23:14:26 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Stefan Farfeleder <e0026813@stud3.tuwien.ac.at>, John Baldwin <jhb@FreeBSD.org>, Juli Mallett <jmallett@FreeBSD.org>, current@FreeBSD.org Subject: Re: [PATCH] Re: Junior Kernel Hacker page updated... Message-ID: <3DA12642.28BB8E1@mindspring.com> References: <20021004132203.A78223@FreeBSD.org> <XFMail.20021004163317.jhb@FreeBSD.org> <20021005135504.GA254@frog.fafoe> <3D9F39BB.66126C35@mindspring.com>
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Terry Lambert wrote:
> Stefan Farfeleder wrote:
> > (kgdb) l *kqueue_scan+0x242
> > 0xc01a1212 is in kqueue_scan
> > (/freebsd/current/src/sys/kern/kern_event.c:716).
> > 713 TAILQ_INSERT_TAIL(&kq->kq_head, &marker, kn_tqe);
> > 714 while (count) {
> > 715 kn = TAILQ_FIRST(&kq->kq_head);
> > translates to: mov (%edi),%ebx
> > 716 TAILQ_REMOVE(&kq->kq_head, kn, kn_tqe);
> > translates to: cmpl $0x0,0x8(%ebx)
> >
> > This line causes the page fault because %ebx is 0.
[ ... ]
> Please try the attached patch.
>
> -- Terry
Stefan: Did the patch fix it, or not?
-- Terry
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