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 > > ___________________________________________ > Get your free mail box @ http://www.mail.md > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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