I've been experiencing periodic kernel panics on my Dual Athlon MP
box.  Until now, I thought it was a hardware problem.  But over the
weekend I replaced the motherboard, CPUs and memory, yet the panics
continue every other day or so.

The system uses a Tyan 2466N-4M Motherboard, 2 2800+ CPU's, an intel
dual gig ethernet card, and a Mylex 352 RAID.  The kernel config is
GENERIC.MP + DIAGNOSTIC + GATEWAY.  I've appended the dmesg at the 
end of this message.

One of the panics is:

    panic: kernel diagnostic assertion "pg == NULL || pg->uobject == uobj"
           failed: file "../../../../misfs/genfs/genfs_vnops.c", line 1134
    Stopped in pid 16.1 (ioflush) at netbsd:cpu_Debugger+04: leave

With a backtrace of:
    cpu_Debugger()
    panic()
    __main()
    genfs_putpaghes()
    VOP_PUTPAGES()
    ffs_full_fsync()
    ffs_fsync()
    VOP_FSYNC()
    ffs_sync()
    sync_fsync()
    VOP_FSYNC()
    sched_synch()

The other panic is within the i386 pmap code in pmap_remove_ptes()
with a "pmap_remove_ptes: unmanaged page marked PG_PVLIST, va = ...".
Unfortunately I don't have a current backtrace for that case.  I do
recall that it's starts when the process calls the exit() syscall.

Is there any information that I should be sure to capture the next
time it panics?

Many thanks,

    --jtc

NetBSD 2.0_RC5 (ORAC) #0: Sat Dec 11 15:17:07 PST 2004
	jtc@orac:/home/jtc/netbsd/NetBSD-2.0/src/sys/arch/i386/compile/ORAC
total memory = 2047 MB
avail memory = 1973 MB
BIOS32 rev. 0 found at 0xfd6b0
mainbus0 (root)
mainbus0: scanning 0x9f000 to 0x9f3f0 for MP signature
mainbus0: scanning 0x9ec00 to 0x9eff0 for MP signature
mainbus0: scanning 0xf0000 to 0xffff0 for MP signature
mainbus0: MP floating pointer found in bios at 0xf7170
mainbus0: MP config table at 0x9f570, 292 bytes long
mainbus0: Intel MP Specification (Version 1.4) (TYAN     PAULANER    )
cpu0 at mainbus0: apid 1 (boot processor)
cpu0: AMD Athlon MP 2800+ (686-class), 2133.60 MHz, id 0x6a0
cpu0: features c3cbfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu0: features c3cbfbff<PGE,MCA,CMOV,PAT,PSE36,MPC,MMXX,MMX>
cpu0: features c3cbfbff<FXSR,SSE,3DNOW2,3DNOW>
cpu0: I-cache 64 KB 64B/line 2-way, D-cache 64 KB 64B/line 2-way
cpu0: L2 cache 512 KB 64B/line 16-way
cpu0: ITLB 16 4 KB entries fully associative, 8 4 MB entries fully associative
cpu0: DTLB 32 4 KB entries fully associative, 8 4 MB entries 4-way
cpu0: calibrating local timer
cpu0: apic clock running at 266 MHz
cpu0: 8 page colors
cpu0: kstack at 0xce4e5000 for 16384 bytes
cpu0: idle pcb at 0xce4e5000, idle sp at 0xce4e8f98
cpu1 at mainbus0: apid 0 (application processor)
cpu1: starting
cpu1: AMD Athlon MP 2800+ (686-class), 2133.41 MHz, id 0x6a0
cpu1: features c3cbfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu1: features c3cbfbff<PGE,MCA,CMOV,PAT,PSE36,MPC,MMXX,MMX>
cpu1: features c3cbfbff<FXSR,SSE,3DNOW2,3DNOW>
cpu1: I-cache 64 KB 64B/line 2-way, D-cache 64 KB 64B/line 2-way
cpu1: L2 cache 512 KB 64B/line 16-way
cpu1: ITLB 16 4 KB entries fully associative, 8 4 MB entries fully associative
cpu1: DTLB 32 4 KB entries fully associative, 8 4 MB entries 4-way
cpu1: kstack at 0xce574000 for 16384 bytes
cpu1: idle pcb at 0xce574000, idle sp at 0xce577f98
mpbios: bus 0 is type PCI   
mpbios: bus 1 is type PCI   
mpbios: bus 2 is type PCI   
mpbios: bus 3 is type PCI   
mpbios: bus 4 is type ISA   
ioapic0 at mainbus0 apid 2 (I/O APIC)
ioapic0: pa 0xfec00000, virtual wire mode, version 11, 24 pins
ioapic0: int0 attached to ExtINT (type 3<type=3=ExtINT> flags 5<pol=1=Act Hi,trig=1=Edge>)
ioapic0: int1 attached to isa0 irq 1 (type 0<type=0> flags 5<pol=1=Act Hi,trig=1=Edge>)
ioapic0: int2 attached to isa0 irq 0 (type 0<type=0> flags 5<pol=1=Act Hi,trig=1=Edge>)
ioapic0: int3 attached to isa0 irq 3 (type 0<type=0> flags 5<pol=1=Act Hi,trig=1=Edge>)
ioapic0: int4 attached to isa0 irq 4 (type 0<type=0> flags 5<pol=1=Act Hi,trig=1=Edge>)
ioapic0: int16 attached to pci0 device 8 INT_A (type 0<type=0> flags f<pol=3=Act Lo,trig=3=Level>)
ioapic0: int6 attached to isa0 irq 6 (type 0<type=0> flags 5<pol=1=Act Hi,trig=1=Edge>)
ioapic0: int7 attached to isa0 irq 7 (type 0<type=0> flags 5<pol=1=Act Hi,trig=1=Edge>)
ioapic0: int8 attached to isa0 irq 8 (type 0<type=0> flags 5<pol=1=Act Hi,trig=1=Edge>)
ioapic0: int17 attached to pci0 device 8 INT_B (type 0<type=0> flags f<pol=3=Act Lo,trig=3=Level>)
ioapic0: int19 attached to pci3 device 0 INT_D (type 0<type=0> flags f<pol=3=Act Lo,trig=3=Level>)
ioapic0: int18 attached to pci1 device 5 INT_A (type 0<type=0> flags f<pol=3=Act Lo,trig=3=Level>)
ioapic0: int12 attached to isa0 irq 12 (type 0<type=0> flags 5<pol=1=Act Hi,trig=1=Edge>)
ioapic0: int13 attached to isa0 irq 13 (type 0<type=0> flags 5<pol=1=Act Hi,trig=1=Edge>)
ioapic0: int14 attached to isa0 irq 14 (type 0<type=0> flags 5<pol=1=Act Hi,trig=1=Edge>)
ioapic0: int15 attached to isa0 irq 15 (type 0<type=0> flags 5<pol=1=Act Hi,trig=1=Edge>)
ioapic0: int17 attached to pci0 device 9 INT_A (type 0<type=0> flags f<pol=3=Act Lo,trig=3=Level>)
ioapic0: int19 attached to pci3 device 8 INT_A (type 0<type=0> flags f<pol=3=Act Lo,trig=3=Level>)
local apic: int0 attached to ExtINT (type 3<type=3=ExtINT> flags 5<pol=1=Act Hi,trig=1=Edge>)
local apic: int1 attached to NMI (type 1<type=1=NMI> flags 5<pol=1=Act Hi,trig=1=Edge>)
mainbus0: MP WARNING: 324 bytes of extended entries not examined
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
pchb0 at pci0 dev 0 function 0
pchb0: Advanced Micro Devices AMD762 NorthBridge (rev. 0x20)
agp0 at pchb0: aperture at 0xf8000000, size 0x4000000
ppb0 at pci0 dev 1 function 0: Advanced Micro Devices AMD762 AGP Bridge (rev. 0x00)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled
vga1 at pci1 dev 5 function 0: Matrox MGA G400 AGP (rev. 0x04)
wsdisplay0 at vga1 kbdmux 1: console (80x25, vt100 emulation)
wsmux1: connecting to wsdisplay0
pcib0 at pci0 dev 7 function 0
pcib0: Advanced Micro Devices AMD768 PCI to ISA/LPC Bridge (rev. 0x05)
viaide0 at pci0 dev 7 function 1
viaide0: Advanced Micro Devices AMD768 IDE Controller (rev. 0x04)
viaide0: bus-master DMA support present
viaide0: primary channel configured to compatibility mode
viaide0: primary channel interrupting at ioapic0 pin 14 (irq 14)
atabus0 at viaide0 channel 0
viaide0: secondary channel configured to compatibility mode
viaide0: secondary channel interrupting at ioapic0 pin 15 (irq 15)
atabus1 at viaide0 channel 1
Advanced Micro Devices AMD768 Power Management Controller (miscellaneous bridge, revision 0x03) at pci0 dev 7 function 3 not configured
wm0 at pci0 dev 8 function 0: Intel i82546EB 1000BASE-T Ethernet, rev. 1
wm0: interrupting at ioapic0 pin 16 (irq 5)
wm0: 64-bit 33MHz PCI bus
wm0: 256 word (8 address bits) MicroWire EEPROM
wm0: Ethernet address 00:07:e9:15:1a:24
makphy0 at wm0 phy 1: Marvell 88E1011 Gigabit PHY, rev. 3
makphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
wm1 at pci0 dev 8 function 1: Intel i82546EB 1000BASE-T Ethernet, rev. 1
wm1: interrupting at ioapic0 pin 17 (irq 9)
wm1: 64-bit 33MHz PCI bus
wm1: 256 word (8 address bits) MicroWire EEPROM
wm1: Ethernet address 00:07:e9:15:1a:25
makphy1 at wm1 phy 1: Marvell 88E1011 Gigabit PHY, rev. 3
makphy1: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
ppb1 at pci0 dev 9 function 0: Intel i960 RN PCI-PCI (rev. 0x02)
pci2 at ppb1 bus 2
pci2: i/o space, memory space enabled, rd/line, wr/inv ok
mly0 at pci0 dev 9 function 1: Mylex AcceleRAID 352
mly0: interrupting at ioapic0 pin 17 (irq 9)
mly0: 2 physical channels, firmware 6.00-1-00 (20000426), 64MB RAM
scsibus0 at mly0 channel 0: 16 targets, 1 lun per target
scsibus1 at mly0 channel 1: 16 targets, 1 lun per target
scsibus2 at mly0 channel 2: 16 targets, 1 lun per target
scsibus3 at mly0 channel 3: 16 targets, 1 lun per target
ppb2 at pci0 dev 16 function 0: Advanced Micro Devices AMD768 PCI to PCI Bridge (rev. 0x05)
pci3 at ppb2 bus 3
pci3: i/o space, memory space enabled
ohci0 at pci3 dev 0 function 0: Advanced Micro Devices AMD768 USB Controller (rev. 0x07)
ohci0: interrupting at ioapic0 pin 19 (irq 10)
ohci0: OHCI version 1.0, legacy support
usb0 at ohci0: USB revision 1.0
uhub0 at usb0
uhub0: Advanced Micro OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 4 ports with 4 removable, self powered
ex0 at pci3 dev 8 function 0: 3Com 3c905C-TX 10/100 Ethernet with mngmt (rev. 0x78)
ex0: interrupting at ioapic0 pin 19 (irq 10)
ex0: MAC address 00:e0:81:2d:09:92
exphy0 at ex0 phy 24: 3Com internal media interface
exphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
isa0 at pcib0
lpt0 at isa0 port 0x378-0x37b irq 7
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
midi0 at pcppi0: PC speaker
sysbeep0 at pcppi0
isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
npx0 at isa0 port 0xf0-0xff: using exception 16
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
isapnp0: no ISA Plug 'n Play devices found
cpu0: prelint0 10700<vector=0,delmode=7,masked,dest=0> 0<target=0>
cpu0: prelint1 400<vector=0,delmode=4,dest=0> 0<target=0>
cpu0: timer0 300c0<vector=c0,delmode=0,masked,dest=0> 0<target=0>
cpu0: pcint0 10000<vector=0,delmode=0,masked,dest=0> 0<target=0>
cpu0: lint0 10700<vector=0,delmode=7,masked,dest=0> 0<target=0>
cpu0: lint1 400<vector=0,delmode=4,dest=0> 0<target=0>
cpu0: err0 10000<vector=0,delmode=0,masked,dest=0> 0<target=0>
ioapic0: enabling
ioapic0: int1 191<vector=91,delmode=1,dest=0> 1000000<target=1>
ioapic0: int3 1d1<vector=d1,delmode=1,dest=0> 1000000<target=1>
ioapic0: int4 1d0<vector=d0,delmode=1,dest=0> 1000000<target=1>
ioapic0: int6 164<vector=64,delmode=1,dest=0> 1000000<target=1>
ioapic0: int7 190<vector=90,delmode=1,dest=0> 1000000<target=1>
ioapic0: int12 192<vector=92,delmode=1,dest=0> 1000000<target=1>
ioapic0: int14 160<vector=60,delmode=1,dest=0> 1000000<target=1>
ioapic0: int15 161<vector=61,delmode=1,dest=0> 1000000<target=1>
ioapic0: int16 a170<vector=70,delmode=1,actlo,level,dest=0> 1000000<target=1>
ioapic0: int17 a162<vector=62,delmode=1,actlo,level,dest=0> 1000000<target=1>
ioapic0: int19 a163<vector=63,delmode=1,actlo,level,dest=0> 1000000<target=1>
raidattach: Asked for 8 units
Kernelized RAIDframe activated
sd0 at scsibus2 target 0 lun 0: <MYLEX, RAID 5, ONLN> disk fixed
sd0: 119 GB, 15602 cyl, 255 head, 63 sec, 512 bytes/sect x 250650624 sectors
sd0: sync (50.00ns offset 8), 16-bit (40.000MB/s) transfers, tagged queueing
wd0 at atabus0 drive 0: <IC35L060AVER07-0>
wd0: drive supports 16-sector PIO transfers, LBA addressing
wd0: 58644 MB, 119150 cyl, 16 head, 63 sec, 512 bytes/sect x 120103200 sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
wd0(viaide0:0:0): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA data transfers)
atapibus0 at atabus1: 2 targets
cd0 at atapibus0 drive 0: <SONY CD-ROM CDU5221, MT1199-A Firmware, 0.30> cdrom removable
cd0: 32-bit data port
cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
cd0(viaide0:1:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA data transfers)
Searching for RAID components...
findroot: can't open dev sd0a (6)
boot device: wd0
root on wd0a dumps on wd0b
mountroot: trying smbfs...
mountroot: trying coda...
mountroot: trying msdos...
mountroot: trying cd9660...
mountroot: trying ntfs...
mountroot: trying nfs...
mountroot: trying lfs...
mountroot: trying ext2fs...
mountroot: trying ffs...
root file system type: ffs
cpu1: prelint0 10000<vector=0,delmode=0,masked,dest=0> 0<target=0>
cpu1: prelint1 10000<vector=0,delmode=0,masked,dest=0> 0<target=0>
cpu1: timer0 200c0<vector=c0,delmode=0,dest=0> 0<target=0>
cpu1: pcint0 10000<vector=0,delmode=0,masked,dest=0> 0<target=0>
cpu1: lint0 10700<vector=0,delmode=7,masked,dest=0> 0<target=0>
cpu1: lint1 400<vector=0,delmode=4,dest=0> 0<target=0>
cpu1: err0 10000<vector=0,delmode=0,masked,dest=0> 0<target=0>
cpu1: CPU 0 running
init: copying out path `/sbin/init' 11
wsdisplay0: screen 1 added (80x25, vt100 emulation)
wsdisplay0: screen 2 added (80x25, vt100 emulation)
wsdisplay0: screen 3 added (80x25, vt100 emulation)
wsdisplay0: screen 4 added (80x25, vt100 emulation)
pid 98 (squid), uid 32767: exited on signal 6 (core not dumped, err = 1)
pid 234 (squid), uid 32767: exited on signal 6 (core not dumped, err = 1)
pid 606 (squid), uid 32767: exited on signal 6 (core not dumped, err = 1)

-- 
J.T. Conklin