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very weird random numbers with jot on macppc



I've noted that jot(1) behaviour is erratic on my system (ibook) wrt to
random number generation.

"jot -r 0" will start generating 1's continuously after a (short) while.
It does it even quicker when higher precision is requested.
"jot -p 9 0" starts throwing 1.000000000's after 74 random lines.
"jot -p 5 0" will do that after 104 lines.  Oddly enough, it happens
only when output goes to the terminal (pipes and redirections seem to
work).

Also, the examples in the manpage produce very suspicious results: The
following happens every 4 or 5 invocations:

$ jot -r -p 0 100000 0.5 3.5 | sort -n | uniq -c 
33162 1
33422 2
33416 3
$ jot -r -p 0 100000 0.5 3.5 | sort -n | uniq -c 
33183 1
33223 2
33594 3
$ jot -r -p 0 100000 0.5 3.5 | sort -n | uniq -c 
 838 1
 781 2
 784 3
97597 0


Another one (more than half the time):

$ jot -w %d -r 100000 1 4 | sort -n | uniq -c 
33104 1
33476 2
33420 3
$ jot -w %d -r 100000 1 4 | sort -n | uniq -c 
89731 1
5164 2
5105 3
$ jot -w %d -r 100000 1 4 | sort -n | uniq -c 
33210 1
33443 2
33347 3
$ jot -w %d -r 100000 1 4 | sort -n | uniq -c 
97808 1
1090 2
1102 3

I'm not an entropy expert, but I suspect there is something very wrong.
All seem to work fine on i386.  So I guess it is a macppc issue.
Here is the dmesg output.

[ using 308668 bytes of bsd ELF symbol table ]
console out [ATY,Bee_A]console in [keyboard] ADB found
using parent ATY,BeeParent:: memaddr 98000000 size 8000000, : consaddr
9c008000, : ioaddr 90020000, size 20000: memtag 8000, iotag 8000:
width 1024 linebytes 1024 height 768 depth 8
Copyright (c) 1982, 1986, 1989, 1991, 1993
	The Regents of the University of California.  All rights reserved.
Copyright (c) 1995-2005 OpenBSD. All rights reserved.  http://www.OpenBSD.org

OpenBSD 3.7 (GENERIC) #225: Sun Mar 20 00:55:39 MST 2005
    deraadt_(_at_)_macppc_(_dot_)_openbsd_(_dot_)_org:/usr/src/sys/arch/macppc/compile/GENERIC
real mem = 134217728 (131072K)
avail mem = 112680960 (110040K)
using 1254 buffers containing 6709248 bytes of memory
mainbus0 (root)
cpu0 at mainbus0: 750FX (Revision 0x203): 800 MHz: 512KB L2 cache
memc0 at mainbus0: uni-n
mpcpcibr0 at mainbus0: uni-north, Revision 0xff
pci0 at mpcpcibr0 bus 0
pchb0 at pci0 dev 11 function 0 "Apple Pangea AGP" rev 0x00
vgafb0 at pci0 dev 16 function 0 "ATI Radeon Mobility M7 LW" rev 0x00, mmio
wsdisplay0 at vgafb0: console (std, vt100 emulation)
mpcpcibr1 at mainbus0: uni-north, Revision 0x0
pci1 at mpcpcibr1 bus 0
pchb1 at pci1 dev 11 function 0 "Apple Pangea PCI" rev 0x00
macobio0 at pci1 dev 23 function 0 "Apple Pangea" rev 0x00
openpic0 at macobio0: version 0x4614
gpio_obio0 at macobio0
gpio_obio1 at gpio_obio0 offset 0x9 irq 47
programmer-switch at gpio_obio0 offset 0x11 not configured
firewire-linkon at gpio_obio0 offset 0x5b not configured
cpu-vcore-select at gpio_obio0 offset 0x6b not configured
extint-gpio4 at gpio_obio0 offset 0x5c not configured
gpio9 at gpio_obio0 offset 0x73 not configured
extint-gpio12 at gpio_obio0 offset 0x64 not configured
gpio5 at gpio_obio0 offset 0x6f not configured
gpio6 at gpio_obio0 offset 0x70 not configured
extint-gpio4 at gpio_obio0 offset 0x5c not configured
gpio11 at gpio_obio0 offset 0x75 not configured
extint-gpio15 at gpio_obio0 offset 0x67 not configured
zsc0 at macobio0: irq 22,23
zstty0 at zsc0 channel 0
zstty1 at zsc0 channel 1
snapper0 at macobio0: irq 30,1,2
adb0 at macobio0 irq 25: via-pmu 3 targets
aed0 at adb0 addr 0: ADB Event device
akbd0 at adb0 addr 2: iBook keyboard with inverted T (ISO layout)
wskbd0 at akbd0 (mux 1 ignored for console): console keyboard, using wsdisplay0
ams0 at adb0 addr 3: EMP trackpad <tpad> 2-button, 400 dpi
wsmouse0 at ams0 mux 0
abtn0 at adb0 addr 7: brightness/volume/eject buttons
apm0 at adb0: battery flags 0x5, 0% charged
ki2c0 at macobio0
wdc0 at macobio0 irq 19: DMA
wd0 at wdc0 channel 0 drive 0: <FUJITSU MHS2030AT>
wd0: 16-sector PIO, LBA48, 28615MB, 58605120 sectors
atapiscsi0 at wdc0 channel 0 drive 1
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <QSI, CD-ROM SCR-242, CL18> SCSI0
5/cdrom removable
wd0(wdc0:0:0): using PIO mode 4, DMA mode 2
cd0(wdc0:0:1): using PIO mode 4, DMA mode 2
audio0 at snapper0
ohci0 at pci1 dev 24 function 0 "Apple Pangea USB" rev 0x00: irq 27, version 1.0
usb0 at ohci0: USB revision 1.0
uhub0 at usb0
uhub0: Apple OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
ohci1 at pci1 dev 25 function 0 "Apple Pangea USB" rev 0x00: irq 28, version 1.0
usb1 at ohci1: USB revision 1.0
uhub1 at usb1
uhub1: Apple OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
mpcpcibr2 at mainbus0: uni-north, Revision 0x6
pci2 at mpcpcibr2 bus 0
pchb2 at pci2 dev 11 function 0 "Apple Pangea PCI" rev 0x00
"Apple Pangea FireWire" rev 0x00 at pci2 dev 14 function 0 not configured
gem0 at pci2 dev 15 function 0 "Apple GMAC" rev 0x00: irq 41, address
00:0a:95:89:b1:9c
bmtphy0 at gem0 phy 0: BCM5221 100baseTX PHY, rev. 4
uhidev0 at uhub1 port 1 configuration 1 interface 0
uhidev0: Logitech USB Mouse, rev 1.10/6.20, addr 2, iclass 3/1
ums0 at uhidev0: 3 buttons and Z dir.
wsmouse1 at ums0 mux 0
bootpath: '/pci_(_at_)_f2000000/mac-io_(_at_)_17/ata-4_(_at_)_1f000/disk_(_at_)_0/bsd'
boot device: wd0.
root on wd0a
rootdev=0x0 rrootdev=0xb00 rawdev=0xb02
ugen0 at uhub1 port 2
ugen0: HCF USB V.90 Data/Fax Modem Apple internal modem, rev 1.10/1.00, addr 3