Reboots under 6.0 while exercising md device

[James Long]

For some reason, this script:

#!/bin/sh

DEV=$(md_config -a -t malloc -s 500m)
newfs -i 512 -U /dev/$DEV

mount /dev/$DEV /mnt
cp -Rp /usr/src /mnt/


will kill my machine.  I get zillions (well, hundreds at
least, without a serial console I can't count them)
of:


Dec 21 19:16:27 test kernel: g_vfs_done():md0[WRITE(offset=352649216, length=16384)]error = 28
Dec 21 19:16:27 test kernel: g_vfs_done():md0[WRITE(offset=352665600, length=12288)]error = 28

with varying offsets and lengths, but seemingly always error 28

The system does not panic orderly, but rather spontaneously reboots after
spewing a lot of the above error messages (5-20 secs worth).

This is on a Compaq Proliant ML370 with 1 GB RAM, dmesg below.


What do I need to fix to be able to use a RAM-backed filesystem?


Jim

FWIW, this script does not seem to freak out my machine,  This led
me to consider inode starvation, but '-i 512' results in over 60000 
inodes for what I estimate to be < 40000 files in /usr/src.

#!/bin/sh

DEV=$(mdconfig -a -t malloc -s 500m)
newfs -i 512 -U /dev/$DEV

mount /dev/$DEV /mnt

dd if=/dev/zero of=/mnt/1M bs=1024 count=1024

for j in $(jot 450); do {
  cp -p /mnt/1M /mnt/1M.$(printf "%03d" $j)
} done


After that, df -h /mnt shows:

/dev/md0         484M    458M    -13M   103%    /mnt


Here's the dmesg:


Copyright (c) 1992-2005 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 6.0-RELEASE #0: Wed Dec 21 15:40:38 PST 2005
    root at test.museum.rain.com:/usr/obj/usr/src/sys/SMP
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel Pentium III (996.85-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x686  Stepping = 6
  Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
real memory  = 1073725440 (1023 MB)
avail memory = 1041682432 (993 MB)
MPTable: <COMPAQ   PROLIANT    >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
 cpu0 (BSP): APIC ID:  1
 cpu1 (AP): APIC ID:  0
ioapic0: Changing APIC ID to 8
ioapic0: Assuming intbase of 0
ioapic0 <Version 1.1> irqs 0-34 on motherboard
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
cpu0 on motherboard
cpu1 on motherboard
pcib0: <ServerWorks NB6635 3.0LE host to PCI bridge> pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
sym0: <1510d> port 0x2000-0x20ff mem 0xc6effc00-0xc6efffff,0xc6efe000-0xc6efefff irq 11 at device 1.0 on pci0
sym0: No NVRAM, ID 7, Fast-40, LVD, parity checking
sym0: [GIANT-LOCKED]
sym1: <1510d> port 0x2400-0x24ff mem 0xc6efdc00-0xc6efdfff,0xc6efc000-0xc6efcfff irq 15 at device 1.1 on pci0
sym1: No NVRAM, ID 7, Fast-40, LVD, parity checking
sym1: [GIANT-LOCKED]
fxp0: <Intel 82559 Pro/100 Ethernet> port 0x2800-0x283f mem 0xc6efb000-0xc6efbfff,0xc6d00000-0xc6dfffff irq 5 at device 2.0 on pci0
miibus0: <MII bus> on fxp0
inphy0: <i82555 10/100 media interface> on miibus0
inphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fxp0: Ethernet address: 00:02:a5:64:d5:4e
pci0: <display, VGA> at device 3.0 (no driver attached)
pci0: <base peripheral> at device 4.0 (no driver attached)
isab0: <PCI-ISA bridge> at device 15.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <ServerWorks ROSB4 UDMA33 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x3000-0x300f at device 15.1 on pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
pcib3: <ServerWorks NB6635 3.0LE host to PCI bridge> pcibus 3 on motherboard
pci3: <PCI bus> on pcib3
ida0: <Compaq Smart Array 431 controller> port 0x4000-0x40ff mem 0xc6fff000-0xc6ffffff irq 10 at device 6.0 on pci3
ida0: [GIANT-LOCKED]
ida0: drives=1 firm_rev=1.18
idad0: <Compaq Logical Drive> on ida0
idad0: 17363MB (35561280 sectors), blocksize=512
eisa0: <EISA bus> on motherboard
mainboard0: <CPQ0690 (System Board)> on eisa0 slot 0
eisa0: unknown card @@D9004 (0x00049004) at slot 2
pmtimer0 on isa0
orm0: <ISA Option ROMs> at iomem 0xc0000-0xc7fff,0xc8000-0xcbfff,0xe8000-0xedfff,0xee000-0xeffff on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model IntelliMouse, device ID 3
fdc0: <Enhanced floppy controller> at port 0x3f0-0x3f5,0x3f7 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
Timecounters tick every 1.000 msec
acd0: CDROM <COMPAQ SC-140S/SE04> at ata0-master PIO4
Waiting 5 seconds for SCSI devices to settle
SMP: AP CPU #1 Launched!
Trying to mount root from ufs:/dev/idad0s1a
WARNING: / was not properly dismounted
WARNING: /tmp was not properly dismounted
WARNING: /usr was not properly dismounted
WARNING: /var was not properly dismounted