Date: Tue, 7 Sep 1999 10:14:23 +0000 (GMT) From: Alfred Perlstein <bright@wintelcom.net> To: Decebal Topala <decebal@mail.md> Cc: questions@FreeBSD.ORG Subject: don't fork bomb Message-ID: <Pine.BSF.4.05.9909071006260.6392-100000@fw.wintelcom.net> In-Reply-To: <199909071605.TAA02860@atlas.dnt.md>
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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?
in the meantime, try adding:
options NMBCLUSTERS=8192
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...
good luck,
-Alfred
>
> Here is the script
> #################################################################
> #!/bin/sh -x
> class_c=0
> class_b=0
> subnet=172.16
> count=2
> while [ ${class_b} != 255 ]
> do
> class_c=0
>
> while [ ${class_c} != 255 ]
> do
> ping -c ${count} ${subnet}.${class_b}.${class_c} &
> class_c=$((${class_c}+1))
> echo ${class_b}.${class_c}
> done
>
> class_b=$((${class_b}+1))
> done
> #####################################################
> And here is my kernel config file.
>
> ################################################################
>
>
> machine "i386"
> cpu "I686_CPU"
> ident fire
> maxusers 500
> options "MAXDSIZ=(256*1024*1024)"
> options "DFLDSIZ=(256*1024*1024)"
> options MATH_EMULATE #Support for x87 emulation
> options INET #InterNETworking
> options FFS #Berkeley Fast Filesystem
> options FFS_ROOT #FFS usable as root device [keep this!]
> options MSDOSFS #MSDOS Filesystem
> options "CD9660" #ISO 9660 Filesystem
> options "CD9660_ROOT" #CD-ROM usable as root. "CD9660" req'ed
> options PROCFS #Process filesystem
> options "COMPAT_43" #Compatible with BSD 4.3 [KEEP THIS!]
> options SCSI_DELAY=15000 #Be pessimistic about Joe SCSI device
> options UCONSOLE #Allow users to grab the console
> options FAILSAFE #Be conservative
> options USERCONFIG #boot -c editor
> options VISUAL_USERCONFIG #visual boot -c editor
> config kernel root on wd0
> controller isa0
> controller pnp0
> controller eisa0
> controller pci0
> controller fdc0 at isa? port "IO_FD1" bio irq 6 drq 2
> disk fd0 at fdc0 drive 0
> disk fd1 at fdc0 drive 1
> options "CMD640" # work around CMD640 chip deficiency
> controller wdc0 at isa? port "IO_WD1" bio irq 14
> disk wd0 at wdc0 drive 0
> disk wd1 at wdc0 drive 1
> controller wdc1 at isa? port "IO_WD2" bio irq 15
> disk wd2 at wdc1 drive 0
> disk wd3 at wdc1 drive 1
> options ATAPI #Enable ATAPI support for IDE bus
> options ATAPI_STATIC #Don't do it as an LKM
> device acd0 #IDE CD-ROM
> device wfd0 #IDE Floppy (e.g. LS-120)
> device mcd0 at isa? port 0x300 bio irq 10
> controller atkbdc0 at isa? port IO_KBD tty
> device atkbd0 at isa? tty irq 1
> device psm0 at isa? tty irq 12
> device vga0 at isa? port ? conflicts
> pseudo-device splash
> device sc0 at isa? tty
> device npx0 at isa? port IO_NPX irq 13
> device sio0 at isa? port "IO_COM1" flags 0x10 tty irq 4
> device sio1 at isa? port "IO_COM2" tty irq 3
> device sio2 at isa? disable port "IO_COM3" tty irq 5
> device sio3 at isa? disable port "IO_COM4" tty irq 9
> device xl0 # 3Com 3c90x (``Boomerang'', ``Cyclone'')
> pseudo-device loop
> pseudo-device ether
> pseudo-device pty 16
> pseudo-device gzip # Exec gzipped a.out's
> options KTRACE #kernel tracing
> options SYSVSHM
> options SYSVMSG
> options SYSVSEM
> pseudo-device bpfilter 4 #Berkeley packet filter
>
> #############################################################
>
> I tried the same the same on linux and it does not trap the system.
>
>
> Please advice any ideas how to solve this.
>
>
> DEcebal
>
>
>
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