Hello all,

In the past couple of weeks, I've been getting pretty regular
crashes and reboots on one of my machines (dmesg attached).  I
tried to cvsup it to the latest -CURRENT, but I kept getting
strange assembler and cc errors during make buildworld, and they 
were never the same.  Not too fond of beating my head against a
wall, I just reinstalled the machine from scratch using the 20000820-
CURRENT snapshot and compiled a custom kernel with 'options DDB'.

I'm still experiencing sudden reboots, especially during large 
writes, but it's inconsistent.  I'm convinced that it's hardware-
related, but I don't know which piece (I've already replaced both 
memory and motherboard to no avail) to blame.

This morning, I received the following panic, and the machine
dropped into debug (Please forgive any spacing or form errors,
as I had to copy this all down by hand):

panic: pmap_release: freeing held page table page
mp_lock = 01000001; cpuid = 1; lapic.id = 00000000

A trace yielded:

Debugger(c0291ff2) at Debugger+0x34
panic(c02afd60,c06f0b2c,d36b548c,43,c015f4ee) at panic+0xa4
pmap_release_free_page(d36b548c,c06f0b2c) at pmap_release_free_page+0xa4
pmap_release(d36b548c) at pmap_release+0x5b
vmspace_free(d36b5420,d36b06c0,d36b06c0,d7196f14,c015bb1b) at vmspace_free+0x6d
cpu_wait(d36b06c0) at cpu_wait+0x15
wait1(d36b0a00,d7196f80,0,d7196fa0,c0270e4d) at wait1+0x2bb
wait4(d36b0a00,d7196f80,bfbffb58,1,80c1000) at wait4+0x10
syscall2(2f,2f,2f,80c1000,1) at syscall+0x219
Xint0x80_syscall() at Xint0x80_sycall+0x2b

Does this help identify the culprit?  Any help would be greatly 


Evan Tsoukalas
Systems Administrator
Source Electronics Corporation
Copyright (c) 1992-2000 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 5.0-20000820-CURRENT #0: Mon Aug 28 15:07:03 EDT 2000
    [EMAIL PROTECTED]:/usr/src/sys/compile/LOON
Timecounter "i8254"  frequency 1193182 Hz
CPU: Pentium III/Pentium III Xeon/Celeron (601.37-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x673  Stepping = 3
real memory  = 536858624 (524276K bytes)
config> di pcic0
config> di sn0
config> di lnc0
config> di le0
config> di ie0
config> di fe0
config> di ed0
config> di cs0
config> di bt0
config> di aic0
config> di aha0
config> di adv0
config> q
avail memory = 519020544 (506856K bytes)
Programming 24 pins in IOAPIC #0
IOAPIC #0 intpin 2 -> irq 0
IOAPIC #0 intpin 16 -> irq 11
IOAPIC #0 intpin 17 -> irq 10
IOAPIC #0 intpin 18 -> irq 5
IOAPIC #0 intpin 19 -> irq 9
FreeBSD/SMP: Multiprocessor motherboard
 cpu0 (BSP): apic id:  1, version: 0x00040011, at 0xfee00000
 cpu1 (AP):  apic id:  0, version: 0x00040011, at 0xfee00000
 io0 (APIC): apic id:  2, version: 0x00170011, at 0xfec00000
Preloaded elf kernel "kernel" at 0xc036d000.
Preloaded userconfig_script "/boot/kernel.conf" at 0xc036d09c.
Pentium Pro MTRR support enabled
md0: Malloc disk
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <Intel 82443BX (440 BX) host to PCI bridge> on motherboard
pci0: <PCI bus> on pcib0
pci0: <Intel 82443BX (440 BX) host to PCI bridge> at 0.0
pcib1: <Intel 82443BX (440 BX) PCI-PCI (AGP) bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <Matrox MGA G400 AGP graphics accelerator> at 0.0 irq 11
isab0: <Intel 82371AB PCI to ISA bridge> at device 4.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX4 ATA33 controller> port 0xd800-0xd80f at device 4.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
pci0: <Intel 82371AB/EB (PIIX4) USB controller> at 4.2
Timecounter "PIIX"  frequency 3579545 Hz
pci0: <Intel 82371AB Power management controller> at 4.3
ahc0: <Adaptec 2940 Ultra2 SCSI adapter> port 0xd000-0xd0ff mem 0xdd000000-0xdd000fff 
irq 9 at device 9.0 on pci0
ahc0: aic7890/91 Wide Channel A, SCSI Id=7, 32/255 SCBs
pcib2: <DEC 21152 PCI-PCI bridge> at device 10.0 on pci0
pci2: <PCI bus> on pcib2
fxp0: <Intel Pro 10/100B/100+ Ethernet> port 0xb800-0xb81f mem 
0xdc800000-0xdc8fffff,0xe1000000-0xe1000fff irq 5 at device 4.0 on pci2
fxp0: Ethernet address 00:90:27:fc:39:40
fxp1: <Intel Pro 10/100B/100+ Ethernet> port 0xb400-0xb41f mem 
0xdc000000-0xdc0fffff,0xe0000000-0xe0000fff irq 9 at device 5.0 on pci2
fxp1: Ethernet address 00:90:27:fc:39:41
pcib3: <PCI to PCI bridge (vendor=8086 device=0960)> at device 11.0 on pci0
pci3: <PCI bus> on pcib3
amr0: <AMI MegaRAID> mem 0xdf000000-0xdf3fffff irq 10 at device 11.1 on pci0
amr0: firmware GH6D bios 1.43  64MB memory
amrd0: <MegaRAID logical drive> on amr0
amrd0: 35000MB (71680000 sectors) RAID 1 (optimal)
isa0: too many memory ranges
fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model MouseMan+, device ID 0
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
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
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/9 bytes threshold
ppi0: <Parallel I/O> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
unknown: <PNP0401> can't assign resources
unknown: <PNP0501> can't assign resources
unknown: <PNP0501> can't assign resources
unknown: <PNP0700> can't assign resources
unknown: <PNP0f13> can't assign resources
unknown: <PNP0303> can't assign resources
APIC_IO: Testing 8254 interrupt delivery
APIC_IO: routing 8254 via IOAPIC #0 intpin 2
IP packet filtering initialized, divert enabled, rule-based forwarding disabled, 
default to deny, logging limited to 100 packets/entry by default
ncp_load: [210-213]
IP Filter: v3.4.9 initialized.  Default = pass all, Logging = enabled
SMP: AP CPU #1 Launched!
acd0: CDROM <FX4820T> at ata1-master using PIO4
Waiting 8 seconds for SCSI devices to settle
sa0 at ahc0 bus 0 target 1 lun 0
sa0: <EXABYTE EXB-89008E00012F V39e> Removable Sequential Access SCSI-2 device 
sa0: 20.000MB/s transfers (10.000MHz, offset 15, 16bit)
Mounting root from ufs:/dev/amrd0s1a
WARNING: / was not properly dismounted
ch0 at ahc0 bus 0 target 0 lun 0
ch0: <EXABYTE EXB-210 1.06> Removable Changer SCSI-2 device 
ch0: 3.300MB/s transfers
ch0: 7 slots, 1 drive, 1 picker, 0 portals

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