With a 4.3-BETA kernel from today (and also with one from a month or
two ago) I can easily induce a panic by trying to copy an audio CD
from an ATAPI drive to a SCSI disk on an ahc controller using this
command:
dd if=/dev/acd0c of=image1 bs=23520
I have no idea if this is a reasonable way to copy the image. I never
tried it before today. It shouldn't cause a panic, of course.
Using remote kgdb I got a stack trace:
Program received signal SIGTRAP, Trace/breakpoint trap.
Debugger (msg=0xc02c60a3 "panic") at ../../i386/i386/db_interface.c:319
319 in_Debugger = 0;
(kgdb) where
#0 Debugger (msg=0xc02c60a3 "panic") at ../../i386/i386/db_interface.c:319
#1 0xc016eb7c in panic (fmt=0xc02bf2ea "for safety")
at ../../kern/kern_shutdown.c:554
#2 0xc013e6d4 in ahc_handle_seqint (ahc=0xc0ec8800, intstat=113)
at ../../dev/aic7xxx/aic7xxx.c:407
#3 0xc0148edd in ahc_platform_intr (arg=0xc0ec8800)
at ../../dev/aic7xxx/aic7xxx_inline.h:472
#4 0xc02ab8c5 in intr_mux (arg=0xc072b760)
at ../../i386/isa/intr_machdep.c:582
#5 0xc0282226 in atapi_read (request=0xc0ffcd00, length=23520)
at machine/cpufunc.h:222
#6 0xc0281cc7 in atapi_interrupt (request=0xc0ffcd00)
at ../../dev/ata/atapi-all.c:385
#7 0xc027b7e6 in ata_intr (data=0xc0ebed80) at ../../dev/ata/ata-all.c:1150
The panics always involve the ahc device interrupting in the middle of
an ata interrupt. (Is that even supposed to happen, ever?)
The console prints this (copied by hand):
ahc1:A:2: ahc_intr - referenced scb not valid during seqint 0x71 scb(0)
ahc1: Dumping Card State at SEQADDR 0x18f
SCB count = 20
Kernel NEXTQSCB = 14
Card NEXTQSCB = 14
QINFIFO entries: 0
Waiting Queue entries:
Disconnected Queue entries: 5:14
QOUTFIFO entries:
Sequencer Free SCB List: 2 0 1 3 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29 30 31
Pending list:
Kernel Free SCB list: 0 16 19 17 7 18 15 1 2 3 4 5 6 8 9 13 12 11 10
panic: for safety
Debugger("panic")
The ATAPI drive is a Plextor 1610A CD-RW, and I am running it in PIO
mode. It also panics the same way in DMA mode.
The destination filesystem has soft-updates turned on. I have never
seen any problems with this machine's SCSI subsystem.
The dmesg output and kernel config file are at the end of this mail.
John
--
John Polstra [EMAIL PROTECTED]
John D. Polstra & Co., Inc. Seattle, Washington USA
"Disappointment is a good sign of basic intelligence." -- Chögyam Trungpa
Copyright (c) 1992-2001 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 4.3-BETA #6: Sun Mar 11 17:14:38 PST 2001
[EMAIL PROTECTED]:/c/src/sys/compile/VASHON
Timecounter "i8254" frequency 1193041 Hz
Timecounter "TSC" frequency 400861711 Hz
CPU: Pentium II/Pentium II Xeon/Celeron (400.86-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0x651 Stepping = 1
Features=0x183fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,
PSE36,MMX,FXSR>
real memory = 134217728 (131072K bytes)
sio1: gdb debugging port
avail memory = 126648320 (123680K bytes)
Preloaded elf kernel "kernel.new" at 0xc03cb000.
Pentium Pro MTRR support enabled
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
pci1: <Matrox MGA Millennium II 2164WA-B AG graphics accelerator> at 0.0 irq 0
isab0: <Intel 82371AB PCI to ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX4 ATA33 controller> port 0xffa0-0xffaf at device 7.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
pci0: <Intel 82371AB/EB (PIIX4) USB controller> at 7.2
chip1: <Intel 82371AB Power management controller> port 0x440-0x44f at device 7.3 on
pci0
pcib2: <DEC 21152 PCI-PCI bridge> at device 16.0 on pci0
pci2: <PCI bus> on pcib2
fxp0: <Intel Pro 10/100B/100+ Ethernet> port 0xef40-0xef5f mem
0xfea00000-0xfeafffff,0xfd0ff000-0xfd0fffff irq 11 at device 17.
0 on pci0
fxp0: Ethernet address 00:e0:81:10:09:c2
ahc0: <Adaptec aic7895 Ultra SCSI adapter> port 0xe400-0xe4ff mem
0xfebfe000-0xfebfefff irq 10 at device 18.0 on pci0
aic7895C: Wide Channel A, SCSI Id=7, 32/255 SCBs
ahc1: <Adaptec aic7895 Ultra SCSI adapter> port 0xe800-0xe8ff mem
0xfebff000-0xfebfffff irq 10 at device 18.1 on pci0
aic7895C: Wide Channel B, SCSI Id=7, 32/255 SCBs
fxp1: <Intel Pro 10/100B/100+ Ethernet> port 0xef80-0xef9f mem
0xfe800000-0xfe8fffff,0xfd0fe000-0xfd0fefff irq 9 at device 20.0
on pci0
fxp1: Ethernet address 00:a0:c9:b0:13:df
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 Generic PS/2 mouse, 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>
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
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
sio1 at port 0x2f8-0x2ff irq 3 flags 0x80 on isa0
sio1: type 16550A
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: Generic chipset (EPP/NIBBLE) in COMPATIBLE mode
plip0: <PLIP network interface> on ppbus0
sbc0: <Creative ViBRA16X> at port 0x220-0x22f,0x330-0x331,0x388-0x38b irq 5 drq 1,3
on isa0
pcm1: <SB16 DSP 4.16 (ViBRA16X)> on sbc0
IPsec: Initialized Security Association Processing.
acd0: CD-RW <PLEXTOR CD-R PX-W1610A> at ata0-master using PIO4
Waiting 2 seconds for SCSI devices to settle
Mounting root from ufs:/dev/da0s1a
da1 at ahc0 bus 0 target 1 lun 0
da1: <IBM DNES-309170W SA30> Fixed Direct Access SCSI-3 device
da1: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled
da1: 8748MB (17916240 512 byte sectors: 255H 63S/T 1115C)
da2 at ahc1 bus 0 target 2 lun 0
da2: <IBM DDRS-34560W S97B> Fixed Direct Access SCSI-2 device
da2: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled
da2: 4357MB (8925000 512 byte sectors: 255H 63S/T 555C)
da0 at ahc0 bus 0 target 0 lun 0
da0: <IBM DDRS-34560W S92A> Fixed Direct Access SCSI-2 device
da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled
da0: 4357MB (8925000 512 byte sectors: 255H 63S/T 555C)
WARNING: / was not properly dismounted
#
# VASHON config file.
#
machine i386
cpu I686_CPU
ident VASHON
maxusers 128
options CLK_USE_I8254_CALIBRATION
options CLK_USE_TSC_CALIBRATION
options COMPAT_43
options USER_LDT # used by WINE
options SYSVSHM
options SYSVSEM
options SYSVMSG
options DDB
# options DDB_UNATTENDED
options KTRACE #kernel tracing
options UCONSOLE
options INET #Internet communications protocols
options INET6 #IPv6
options USERCONFIG #boot -c editor
options VISUAL_USERCONFIG #visual boot -c editor
pseudo-device bpf #Berkeley packet filter
pseudo-device ether #Generic Ethernet
pseudo-device loop #Network loopback device
pseudo-device pty #Pseudo ttys - can go as high as 256
pseudo-device snp 3 #Snoop device - to look at pty/vty/etc.
pseudo-device tun #Tunnel driver (user process ppp)
pseudo-device vn #Turns a file into a device
options IPSEC
options IPSEC_ESP
pseudo-device gif 4
options FFS #Fast filesystem
options FFS_ROOT
options SOFTUPDATES
options MFS #Memory filesystem
options NFS #Network File System
options CD9660 #ISO 9660 filesystem
options EXT2FS
options MSDOSFS #MS DOS File System
options PROCFS #Process filesystem
options NSWAPDEV=4
# For ntpd:
options P1003_1B
options _KPOSIX_PRIORITY_SCHEDULING
device pci
device fxp
device ahc
options AHC_ALLOW_MEMIO #Memory-mapped I/O
device ahc0
device ahc1
device scbus0 at ahc0 #base SCSI code
device scbus1 at ahc1 #base SCSI code
device da
device da0 at scbus0 target 0 unit 0 #SCSI disks
device da1 at scbus0 target 1 unit 0 #SCSI disks
device da2 at scbus1 target 2 unit 0 #SCSI disks
device sa #SCSI tapes
device cd #SCSI CD-ROMs
device pass #SCSI pass-thru device
device isa
options AUTO_EOI_1
# Keyboard, mouse, display.
device atkbdc0 at isa? port IO_KBD
device atkbd0 at atkbdc? irq 1 flags 0x1
device psm0 at atkbdc? irq 12
device vga0 at isa?
device sc0 at isa? flags 0x100
pseudo-device splash
device npx0 at nexus? port IO_NPX irq 13
device ata # PCI device
device ata0 at isa? port IO_WD1 irq 14
device ata1 at isa? port IO_WD2 irq 15
device atadisk
device atapicd
#options ATA_ENABLE_ATAPI_DMA
device fdc0 at isa? port IO_FD1 irq 6 drq 2
device fd0 at fdc0 drive 0
device sio0 at isa? port IO_COM1 flags 0x10 irq 4
device sio1 at isa? port IO_COM2 flags 0x80 irq 3
device ppc0 at isa? irq 7
device ppbus
device plip
# Luigi's sound driver
device pcm0 at isa? port? irq 10 drq 1
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