bin/60385: vmstat/iostat/top all fail to report CPU usage(still in 5.3R)

Mon Jan 10 10:10:10 PST 2005

The following reply was made to PR bin/60385; it has been noted by GNATS.

From: Simon House <simonhouse at shaw.ca>
To: freebsd-gnats-submit at FreeBSD.org,
	jin at adsl-63-198-35-122.dsl.snfc21.pacbell.net
Cc:  
Subject: Re: bin/60385: vmstat/iostat/top all fail to report CPU usage (still
 in 5.3R)
Date: Mon, 10 Jan 2005 11:03:27 -0700

 I have just aquired an old dual PII, and have compiled the stock SMP
 kernel + patch per PR17800.  My results (with a possible clue to fix)
 are as follows:

 1)  Top/vmstat/etc report as normal after reboot

 2)  Approximately 20 minutes later, the bug appears and all zeros are
 reported in top.

 3)  Using 'date' I run the system clock back a few minutes, and top is
 reporting the (presumably correct) information once again.

 4)  Another ~20 minutes pass - and the bug is back, but of course works 
 again after changing the system date!

 fire# uname -a
 FreeBSD fire.xxxx.ca 5.3-RELEASE FreeBSD 5.3-RELEASE #1: Mon Jan 10
 09:55:27 MST 2005     root at fire.xxx.ca:/usr/src/sys/i386/compile/SMP  i386

 ----top results after reboot:
 CPU states:  0.2% user,  0.0% nice,  0.2% system,  0.0% interrupt, 99.6%
 idle

 ----top results after 20 minutes:
 CPU states:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  0.0% 
 idle

 ----top results after running the clock back 2 minutes (then back to the 
 correct time)
 CPU states:  0.6% user,  0.0% nice,  1.1% system,  0.0% interrupt, 98.3% 
 idle

 fire# dmesg
 Copyright (c) 1992-2004 The FreeBSD Project.
 Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
          The Regents of the University of California. All rights reserved.
 FreeBSD 5.3-RELEASE #1: Mon Jan 10 09:55:27 MST 2005
      root at fire.xxxxx.ca:/usr/src/sys/i386/compile/SMP
 Timecounter "i8254" frequency 1193182 Hz quality 0
 CPU: Pentium II/Pentium II Xeon/Celeron (350.80-MHz 686-class CPU)
    Origin = "GenuineIntel"  Id = 0x652  Stepping = 2

 Features=0x183fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>
 real memory  = 536858624 (511 MB)
 avail memory = 515694592 (491 MB)
 MPTable: <OEM00000 PROD00000000>
 FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
   cpu0 (BSP): APIC ID:  1
   cpu1 (AP): APIC ID:  0
 ioapic0: Assuming intbase of 0
 ioapic0 <Version 1.1> irqs 0-23 on motherboard
 npx0: [FAST]
 npx0: <math processor> on motherboard
 npx0: INT 16 interface
 pcib0: <Intel 82443BX (440 BX) host to PCI bridge> pcibus 0 on motherboard
 pir0: <PCI Interrupt Routing Table: 7 Entries> on motherboard
 pci0: <PCI bus> on pcib0
 agp0: <Intel 82443BX (440 BX) host to PCI bridge> mem 
 0xe4000000-0xe7ffffff at device 0.0 on pci0
 pcib1: <PCI-PCI bridge> at device 1.0 on pci0
 pci1: <PCI bus> on pcib1
 isab0: <PCI-ISA bridge> at device 4.0 on pci0
 isa0: <ISA bus> on isab0
 atapci0: <Intel PIIX4 UDMA33 controller> port 
 0xd800-0xd80f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 4.1 on pci0
 ata0: channel #0 on atapci0
 ata1: channel #1 on atapci0
 uhci0: <Intel 82371AB/EB (PIIX4) USB controller> port 0xd400-0xd41f at 
 device 4.2 on pci0
 uhci0: [GIANT-LOCKED]
 usb0: <Intel 82371AB/EB (PIIX4) USB controller> on uhci0
 usb0: USB revision 1.0
 uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
 uhub0: 2 ports with 2 removable, self powered
 piix0: <PIIX Timecounter> port 0xe800-0xe80f at device 4.3 on pci0
 Timecounter "PIIX" frequency 3579545 Hz quality 0
 ahc0: <Adaptec aic7890/91 Ultra2 SCSI adapter> port 0xd000-0xd0ff mem 
 0xe1000000-0xe1000fff irq 5 at device 6.0 on pci0
 ahc0: [GIANT-LOCKED]
 aic7890/91: Ultra2 Wide Channel A, SCSI Id=7, 32/253 SCBs
 rl0: <RealTek 8139 10/100BaseTX> port 0xb800-0xb8ff mem 
 0xe0800000-0xe08000ff irq 10 at device 11.0 on pci0
 miibus0: <MII bus> on rl0
 rlphy0: <RealTek internal media interface> on miibus0
 rlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
 rl0: Ethernet address: 00:ee:b1:00:08:59
 pci0: <display, VGA> at device 12.0 (no driver attached)
 cpu0 on motherboard
 cpu1 on motherboard
 orm0: <ISA Option ROMs> at iomem 0xc8000-0xccfff,0xc0000-0xc7fff on isa0
 pmtimer0 on isa0
 atkbdc0: <Keyboard controller (i8042)> at port 0x64,0x60 on isa0
 atkbd0: <AT Keyboard> irq 1 on atkbdc0
 kbd0 at atkbd0
 atkbd0: [GIANT-LOCKED]
 fdc0: <Enhanced floppy controller> at port 0x3f0-0x3f5 irq 6 drq 2 on isa0
 fdc0: [FAST]
 fd0: <1440-KB 3.5" drive> on fdc0 drive 0
 ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
 ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode
 ppbus0: <Parallel port bus> on ppc0
 plip0: <PLIP network interface> on ppbus0
 lpt0: <Printer> on ppbus0
 lpt0: Interrupt-driven port
 ppi0: <Parallel I/O> on ppbus0
 sc0: <System console> at flags 0x100 on isa0
 sc0: VGA <16 virtual consoles, flags=0x300>
 sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
 sio0: type 16550A
 sio1 at port 0x2f8-0x2ff irq 3 on isa0
 sio1: type 16550A
 vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
 unknown: <PNP0400> can't assign resources (port)
 unknown: <PNP0501> can't assign resources (port)
 unknown: <PNP0501> can't assign resources (port)
 unknown: <PNP0700> can't assign resources (port)
 unknown: <PNP0303> can't assign resources (port)
 Timecounters tick every 10.000 msec
 Waiting 15 seconds for SCSI devices to settle
 da0 at ahc0 bus 0 target 0 lun 0
 da0: <SEAGATE ST39175LC 0001> Fixed Direct Access SCSI-2 device
 da0: 40.000MB/s transfers (20.000MHz, offset 15, 16bit), Tagged Queueing 
 Enabled
 da0: 8683MB (17783240 512 byte sectors: 255H 63S/T 1106C)
 da1 at ahc0 bus 0 target 1 lun 0
 da1: <SEAGATE ST39173WC 6244> Fixed Direct Access SCSI-2 device
 da1: 40.000MB/s transfers (20.000MHz, offset 15, 16bit), Tagged Queueing 
 Enabled
 da1: 8683MB (17783240 512 byte sectors: 255H 63S/T 1106C)
 SMP: AP CPU #1 Launched!
 Mounting root from ufs:/dev/da0s1a