I am debugging a program that does a lot of disk I/O and the system hangs
briefly with the some repeated messages that looks like:
(da0:ahc0:0:0:0): SCB 0x0 - Timed out in Data-in phase, SEQADDR==0x88
(da0:ahc0:0:0:0): BDR message in message buffer
(da0:ahc0:0:0:0): SCB 0x0 - Timed out in Data-in phase, SEQADDR==0x89
(da0:ahc0:0:0:0): no longer in timeout, status= 34b
ahc0: Issued Channel A Bus Reset. 2SCBs aborted.
What should I do now? The following is my dmesg output:
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 4.1-RELEASE #0: Tue Sep 26 01:34:11 GMT 2000
[EMAIL PROTECTED]:/usr/src/sys/compile/SUNYFS
Timecounter "i8254" frequency 1193182 Hz
CPU: Pentium III/Pentium III Xeon/Celeron (501.14-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0x673 Stepping = 3
Features=0x383fbffFPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,XMM
real memory = 134205440 (131060K bytes)
avail memory = 126341120 (123380K bytes)
Preloaded elf kernel "kernel" at 0xc0419000.
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
pcib1: Intel 82443BX (440 BX) PCI-PCI (AGP) bridge at device 1.0 on pci0
pci1: PCI bus on pcib1
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
uhci0: Intel 82371AB/EB (PIIX4) USB controller port 0xd400-0xd41f irq 10 at device
4.2 on pci0
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
uhub0: port 1 power on failed, IOERROR
uhub0: port 2 power on failed, IOERROR
chip1: Intel 82371AB Power management controller port 0xe800-0xe80f at device 4.3 on
pci0
ahc0: Adaptec aic7890/91 Ultra2 SCSI adapter port 0xd000-0xd0ff mem
0xe300-0xe3000fff irq 10 at device 6.0 on pci0
ahc0: aic7890/91 Wide Channel A, SCSI Id=7, 16/255 SCBs
dc0: LC82C115 PNIC II 10/100BaseTX port 0xb800-0xb8ff mem 0xe280-0xe28000ff irq
11 at device 10.0 on pci0
dc0: Ethernet address: 00:a0:cc:e4:b7:14
miibus0: MII bus on dc0
dcphy0: Intel 21143 NWAY media interface on miibus0
dcphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
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
kbd0 at atkbd0
vga0: Generic ISA VGA at port 0x3c0-0x3df iomem 0xa-0xb 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
plip0: PLIP network interface on ppbus0
ata0-slave: ata_command: timeout waiting for intr
ata0-slave: identify failed
acd0: CDROM CD-540E at ata0-master using PIO4
Waiting 15 seconds for SCSI devices to settle
Mounting root from ufs:/dev/da0s1a
da0 at ahc0 bus 0 target 0 lun 0
da0: SEAGATE ST39140LW 1500 Fixed Direct Access SCSI-2 device
da0: 80.000MB/s transfers (40.000MHz, offset 15, 16bit), Tagged Queueing Enabled
da0: 8683MB (17783240 512 byte sectors: 255H 63S/T 1106C)
WARNING: / was not properly dismounted
Any help is appreciated.
-Zhihui
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