Date: Wed, 8 Sep 1999 08:42:25 +0000 (GMT) From: Alfred Perlstein <bright@wintelcom.net> To: Decebal Topala <decebal@mail.md> Cc: questions@FreeBSD.ORG Subject: Re: don't fork bomb Message-ID: <Pine.BSF.4.05.9909080841310.6392-100000@fw.wintelcom.net> In-Reply-To: <199909080937.MAA07551@atlas.dnt.md>
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On Wed, 8 Sep 1999, Decebal Topala wrote:
> On Tuesday, September 07, 1999 at 04:14:23 PM, Alfred Perlstein wrote:
>
> >
> > On Tue, 7 Sep 1999, Decebal Topala wrote:
> >
> > > Hi
> > >
> > > I used an script to ping all ip addresses in my ocal ip subnet.
> > > I was very slow. In order to make this faster i put ping process in
> > > baground. After 15 second system is dumpimg.
> >
> > can you please tell us the panic message?
> >
> Here is the trap message
>
>
> Fatal trap:12 page fault while in kernel mode
> fault virtual address=0x50008800
> fault mode= supervisor read,page not present
> instruction pinter 0x8:0xc0177b58
> stack pionter 0x10:0xcb074e18
> frame pointer 0x10:0xcad77e1c
> code segment: base 0x0, limit 0xffff, type 0x1b
> DPL 0, press 1, def32 1, gran 1,
> processor eflags intrerupt enable, resume,IOPL=0;
> current process 2690sh (Current proccess sometimes was idle)
> intrerupt mask: net;
> trap number:12
> panic:fault page
>
> This works even if it is runned from simple user id.
Is it possible for you to get a crash dump and give a traceback?
> > in the meantime, try adding:
> >
> > options NMBCLUSTERS=8192
> Even wwith this it crashes.
>
> I thing it is an network issue.
> To many icmp opened sessions at the same time.
>
> >
> > I'll see what I can do about this on a -stable box i have.
> >
> > it looks like this script constitutes a nice fork bomb, you
> > are forking 62230 processes, maybe a workaround would be to
> > add a "wait" right after before "class_b=$((${class_b}+1))"
>
> > this will limit the script to 254 pings at a time...
> I agree.
>
> >
> > good luck,
> > -Alfred
> >
>
> Yes but some users will be able to down my bsd box.
Not if you give them login limits, "man login.conf" should help.
> ???
> DEcebal
>
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