Unreliable cdmrw in 2.6.5/6

From: Chris Clayton
Date: Tue May 25 2004 - 02:40:07 EST

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[0] Please cc me, I'm not subscribed.

[1] Writing to CDMRW unreliable in 2.6.{5,6}

[2] Using Jens Axboe's patch and formatting utility, I have used Mt Rainier
(cdmrw) successfully on 2.4.{24,25,26} for several months. Of course this was
through scsi emulation, where my Lite-On LTR-48246K (/dev/hdc)
became /dev/sr0. Since upgrading to 2.6.5 (and more recently, 2.6.6), I have
heeded the warnings of eternal damnation and "turned off" scsi emulation.
However, I now find cdmrw to be most unreliable. By unreliable, I mean that
some files written to the disc appear in directory listings until the disc is
umounted, but are missing when it is mounted again. Attempts to copy
"gone-missing" files to the disc result in an error that the file already
exists. At first, I thought it was a udffs problem, because of a
regularly-experienced oops within udf, so I mailed the oops to Ben Fennema,
copied to Jens. Jens suggested that I should try with 2.6.6 and a different
fs, so I tried ext2 and encountered the same unreliability (but no oops).
However, I also noticed that in both cases (udf and ext2), the
filesystem-generated errors shown in the output from dmesg were all
accompanied by a "tray open" message on hdc. I believe this message comes
from drivers/ide/ide-cd.c. The diagnostics are at section 5 below.

[3] cdmrw, ide-cd, "tray open"

[4]cat /proc/version
Linux version 2.6.6 (root@upstairs) (gcc version 3.3.3) #8 Mon May 24 09:35:39
UTC 2004

[5] UDFFS:

cdrom: hdc: mrw address space DMA selected
cdrom open: mrw_status 'bgformat inactive'
cdrom: Restarting format
UDF-fs DEBUG fs/udf/lowlevel.c:57:udf_get_last_session: XA disk: no,
vol_desc_start=1560
UDF-fs DEBUG fs/udf/super.c:1546:udf_fill_super: Multi-session=0
UDF-fs DEBUG fs/udf/super.c:534:udf_vrs: Starting at sector 16 (2048 byte
sectors)
UDF-fs DEBUG fs/udf/super.c:877:udf_load_pvoldesc: recording time
1084717322/121768, 2004/05/16 14:22 (1000)
UDF-fs DEBUG fs/udf/super.c:888:udf_load_pvoldesc: volIdent[] = 'LinuxUDF'
UDF-fs DEBUG fs/udf/super.c:895:udf_load_pvoldesc: volSetIdent[] =
'40a7790aLinuxUDF'
UDF-fs DEBUG fs/udf/misc.c:236:udf_read_tagged: location mismatch block
258080, tag 2863311530 != 258080
UDF-fs DEBUG fs/udf/super.c:1087:udf_load_logicalvol: Partition (0:0) type 2
on volume 1
UDF-fs DEBUG fs/udf/super.c:1097:udf_load_logicalvol: FileSet found in
LogicalVolDesc at block=32, partition=0
UDF-fs DEBUG fs/udf/super.c:925:udf_load_partdesc: Searching map: (0 == 0)
UDF-fs DEBUG fs/udf/super.c:966:udf_load_partdesc: unallocSpaceBitmap (part 0)
@ 0
UDF-fs DEBUG fs/udf/super.c:1007:udf_load_partdesc: Partition (0:0 type 1522)
starts at physical 1408, block length 256480
UDF-fs DEBUG fs/udf/super.c:1340:udf_load_partition: Using anchor in block 256
UDF-fs DEBUG fs/udf/super.c:1573:udf_fill_super: Lastblock=0
UDF-fs DEBUG fs/udf/super.c:849:udf_find_fileset: Fileset at block=32,
partition=0
UDF-fs DEBUG fs/udf/super.c:911:udf_load_fileset: Rootdir at block=96,
partition=0
UDF-fs INFO UDF 0.9.8.1 (2004/29/09) Mounting volume 'LinuxUDF', timestamp
2004/05/16 14:22 (1000)
hdc: tray open
end_request: I/O error, dev hdc, sector 15076
UDF-fs DEBUG fs/udf/inode.c:1346:udf_update_inode: bread failure
hdc: tray open
end_request: I/O error, dev hdc, sector 17724
UDF-fs DEBUG fs/udf/inode.c:1346:udf_update_inode: bread failure
hdc: tray open
end_request: I/O error, dev hdc, sector 20776
UDF-fs DEBUG fs/udf/inode.c:1346:udf_update_inode: bread failure
hdc: tray open
end_request: I/O error, dev hdc, sector 54348
UDF-fs DEBUG fs/udf/inode.c:1346:udf_update_inode: bread failure
hdc: tray open
end_request: I/O error, dev hdc, sector 87980
UDF-fs DEBUG fs/udf/inode.c:1346:udf_update_inode: bread failure
hdc: tray open
end_request: I/O error, dev hdc, sector 105788
UDF-fs DEBUG fs/udf/inode.c:1346:udf_update_inode: bread failure
hdc: tray open
end_request: I/O error, dev hdc, sector 116868
UDF-fs DEBUG fs/udf/inode.c:1346:udf_update_inode: bread failure
hdc: tray open
end_request: I/O error, dev hdc, sector 141712
UDF-fs DEBUG fs/udf/inode.c:1346:udf_update_inode: bread failure
hdc: tray open
end_request: I/O error, dev hdc, sector 151316
UDF-fs DEBUG fs/udf/inode.c:1346:udf_update_inode: bread failure
hdc: tray open
end_request: I/O error, dev hdc, sector 163348
UDF-fs DEBUG fs/udf/inode.c:1346:udf_update_inode: bread failure
hdc: tray open
end_request: I/O error, dev hdc, sector 178436
UDF-fs DEBUG fs/udf/inode.c:1346:udf_update_inode: bread failure
hdc: tray open
end_request: I/O error, dev hdc, sector 186120
UDF-fs DEBUG fs/udf/inode.c:1346:udf_update_inode: bread failure
hdc: tray open
end_request: I/O error, dev hdc, sector 191104
UDF-fs DEBUG fs/udf/inode.c:1346:udf_update_inode: bread failure
cdrom: hdc: mrw address space DMA selected
cdrom open: mrw_status 'bgformat active'
UDF-fs DEBUG fs/udf/lowlevel.c:57:udf_get_last_session: XA disk: no,
vol_desc_start=1560
UDF-fs DEBUG fs/udf/super.c:1546:udf_fill_super: Multi-session=0
UDF-fs DEBUG fs/udf/super.c:534:udf_vrs: Starting at sector 16 (2048 byte
sectors)
UDF-fs DEBUG fs/udf/super.c:877:udf_load_pvoldesc: recording time
1084717322/121768, 2004/05/16 14:22 (1000)
UDF-fs DEBUG fs/udf/super.c:888:udf_load_pvoldesc: volIdent[] = 'LinuxUDF'
UDF-fs DEBUG fs/udf/super.c:895:udf_load_pvoldesc: volSetIdent[] =
'40a7790aLinuxUDF'
UDF-fs DEBUG fs/udf/misc.c:236:udf_read_tagged: location mismatch block
258080, tag 2863311530 != 258080
UDF-fs DEBUG fs/udf/super.c:1087:udf_load_logicalvol: Partition (0:0) type 2
on volume 1
UDF-fs DEBUG fs/udf/super.c:1097:udf_load_logicalvol: FileSet found in
LogicalVolDesc at block=32, partition=0
UDF-fs DEBUG fs/udf/super.c:925:udf_load_partdesc: Searching map: (0 == 0)
UDF-fs DEBUG fs/udf/super.c:966:udf_load_partdesc: unallocSpaceBitmap (part 0)
@ 0
UDF-fs DEBUG fs/udf/super.c:1007:udf_load_partdesc: Partition (0:0 type 1522)
starts at physical 1408, block length 256480
UDF-fs DEBUG fs/udf/super.c:1340:udf_load_partition: Using anchor in block 256
UDF-fs DEBUG fs/udf/super.c:1573:udf_fill_super: Lastblock=0
UDF-fs DEBUG fs/udf/super.c:849:udf_find_fileset: Fileset at block=32,
partition=0
UDF-fs DEBUG fs/udf/super.c:911:udf_load_fileset: Rootdir at block=96,
partition=0
UDF-fs INFO UDF 0.9.8.1 (2004/29/09) Mounting volume 'LinuxUDF', timestamp
2004/05/16 14:22 (1000)
UDF-fs DEBUG fs/udf/misc.c:236:udf_read_tagged: location mismatch block 3769,
tag 2863311530 != 2361
udf: udf_read_inode(ino 3769) failed !bh
Unable to handle kernel NULL pointer dereference at virtual address 00000008
printing eip:
c01c42f2
*pde = 00000000
Oops: 0000 [#1]
PREEMPT
CPU: 0
EIP: 0060:[<c01c42f2>] Not tainted
EFLAGS: 00210293 (2.6.5)
EIP is at udf_get_fileshortad+0x22/0x50
eax: 00000008 ebx: 0807d328 ecx: d9e8fd78 edx: 000000c0
esi: d6cf8840 edi: 00000008 ebp: d9e8fd78 esp: d9e8fcb0
ds: 007b es: 007b ss: 0068
Process kdeinit (pid: 907, threadinfo=d9e8e000 task=d76fe7e0)
Stack: d9e8fcd0 c01ba7ed 00000008 0807d328 d9e8fd78 00000001 00200046 00000035
0000000a c040be1b 00000002 c040c1ff 00200046 00000000 c036caf8 00000001
d9e8fd10 c0118dd1 d9e8fd94 d9e8fd80 d9e8fd84 d6cf8878 c01ba593 d6cf8878
Call Trace:
[<c01ba7ed>] udf_current_aext+0x17d/0x1f0
[<c0118dd1>] __wake_up_common+0x31/0x60
[<c01ba593>] udf_next_aext+0x43/0x120
[<c01c2cf4>] udf_discard_prealloc+0xd4/0x2e0
[<c0168b27>] get_new_inode_fast+0x47/0x100
[<c01b5f36>] udf_put_inode+0x36/0x70
[<c0169370>] iput+0x70/0x80
[<c01b9da5>] udf_iget+0xd5/0x140
[<c01bbbee>] udf_lookup+0xbe/0x150
[<c02b268c>] memcpy_fromiovec+0x5c/0xb0
[<c0160000>] vfs_follow_link+0x50/0x1b0
[<c015d048>] real_lookup+0xc8/0xf0
[<c015d2d6>] do_lookup+0x96/0xb0
[<c015d7bd>] link_path_walk+0x4cd/0x940
[<c015e119>] __user_walk+0x49/0x60
[<c0158fbc>] vfs_lstat+0x1c/0x60
[<c015970b>] sys_lstat64+0x1b/0x40
[<c0108a47>] syscall_call+0x7/0xb

Code: 83 38 00 74 0d 83 7c 24 14 00 74 02 89 11 83 c4 04 c3 31 c0

EXT2:

cdrom: hdc: mrw address space DMA selected
cdrom open: mrw_status 'bgformat inactive'
cdrom: Restarting format
hdc: tray open
end_request: I/O error, dev hdc, sector 131072
EXT2-fs error (device hdc): read_block_bitmap: Cannot read block bitmap -
block_group = 2, block_bitmap = 32768
hdc: tray open
end_request: I/O error, dev hdc, sector 131072
EXT2-fs error (device hdc): read_block_bitmap: Cannot read block bitmap -
block_group = 2, block_bitmap = 32768
hdc: tray open
end_request: I/O error, dev hdc, sector 131072
EXT2-fs error (device hdc): read_block_bitmap: Cannot read block bitmap -
block_group = 2, block_bitmap = 32768
hdc: tray open
end_request: I/O error, dev hdc, sector 131072
EXT2-fs error (device hdc): read_block_bitmap: Cannot read block bitmap -
block_group = 2, block_bitmap = 32768

[6] a) format a cdrw disc with Jens' cdmrw utilty;
b) mkudffs -media-type-cdrw /dev/hdX
c) mount -o rw,noatime /dev/hdX /mnt/cdmrw
d) write a number of files to /mnt/cdmrw (> 30 should trigger)
e) umount /mnt/cdmrw
f) mount -o rw,noatime /dev/hdX /mnt/cdmrw

[7.1] ver_linux
If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.

Linux upstairs 2.6.6 #8 Mon May 24 09:35:39 UTC 2004 i686 unknown unknown
GNU/Linux

Gnu C 3.3.3
Gnu make 3.80
binutils 2.14.90.0.8
util-linux 2.12
mount 2.12
module-init-tools 3.0
e2fsprogs 1.35
xfsprogs 2.6.0
pcmcia-cs 3.2.7
PPP 2.4.1
Linux C Library 2.3.4
Dynamic linker (ldd) 2.3.4
Linux C++ Library 5.0.5
Procps 3.1.15
Net-tools 1.57
Kbd 0.99
Sh-utils 5.1.2
Modules Loaded snd_bt87x tuner tda9887 msp3400 bttv video_buf
i2c_algo_bit v4l2_common btcx_risc i2c_core videodev evdev ipt_LOG ipt_state
ip_conntrack_ftp ip_conntrack iptable_filter ip_tables joydev

[7.2] cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 8
model name : AMD Athlon(tm) XP 2100+
stepping : 1
cpu MHz : 1741.087
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
bogomips : 3432.44

[7.3] cat /proc/modules
snd_bt87x 11204 1 - Live 0xe0933000
tuner 18832 0 - Live 0xe093a000
tda9887 11268 0 - Live 0xe092f000
msp3400 22036 0 - Live 0xe091d000
bttv 145484 0 - Live 0xe094d000
video_buf 17476 1 bttv, Live 0xe0924000
i2c_algo_bit 8904 1 bttv, Live 0xe0913000
v4l2_common 4928 1 bttv, Live 0xe0910000
btcx_risc 3848 1 bttv, Live 0xe08ce000
i2c_core 18756 5 tuner,tda9887,msp3400,bttv,i2c_algo_bit, Live 0xe0917000
videodev 7168 1 bttv, Live 0xe090d000
evdev 7296 0 - Live 0xe0906000
ipt_LOG 5760 1 - Live 0xe090a000
ipt_state 1472 1 - Live 0xe0904000
ip_conntrack_ftp 71024 0 - Live 0xe08f1000
ip_conntrack 29640 2 ipt_state,ip_conntrack_ftp, Live 0xe08e8000
iptable_filter 2176 1 - Live 0xe08d3000
ip_tables 15552 3 ipt_LOG,ipt_state,iptable_filter, Live 0xe08d9000
joydev 7808 0 - Live 0xe08d0000

[7.5] lspci -vvv
00:00.0 Host bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo KT266/A/333]
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort+ >SERR- <PERR-
Latency: 0
Region 0: Memory at e8000000 (32-bit, prefetchable) [size=64M]
Capabilities: [a0] AGP version 2.0
Status: RQ=31 SBA+ 64bit- FW- Rate=x1,x2
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:01.0 PCI bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo KT266/A/333 AGP]
(prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort+ >SERR- <PERR-
Latency: 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 0000f000-00000fff
Memory behind bridge: ec000000-edffffff
Prefetchable memory behind bridge: e0000000-e7ffffff
BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B-
Capabilities: [80] Power Management version 2
Flags: PMEClk- DSI- D1+ D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:09.0 USB Controller: NEC Corporation USB (rev 41) (prog-if 10 [OHCI])
Subsystem: Unknown device 2027:0035
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (250ns min, 10500ns max), cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: Memory at ee000000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [40] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0+,D1+,D2+,D3hot+,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:09.1 USB Controller: NEC Corporation USB (rev 41) (prog-if 10 [OHCI])
Subsystem: Unknown device 2027:0035
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (250ns min, 10500ns max), cache line size 08
Interrupt: pin B routed to IRQ 5
Region 0: Memory at ee001000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [40] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0+,D1+,D2+,D3hot+,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:09.2 USB Controller: NEC Corporation USB 2.0 (rev 02) (prog-if 20 [EHCI])
Subsystem: Unknown device 2027:0032
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (4000ns min, 8500ns max), cache line size 10
Interrupt: pin C routed to IRQ 10
Region 0: Memory at ee002000 (32-bit, non-prefetchable) [size=256]
Capabilities: [40] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0+,D1+,D2+,D3hot+,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:0a.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture
(rev 11)
Subsystem: Pinnacle Systems Inc. PCTV pro (TV + FM stereo receiver)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (4000ns min, 10000ns max)
Interrupt: pin A routed to IRQ 5
Region 0: Memory at ee003000 (32-bit, prefetchable) [size=4K]
Capabilities: [44] Vital Product Data
Capabilities: [4c] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:0a.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev
11)
Subsystem: Pinnacle Systems Inc. PCTV pro (TV + FM stereo receiver,
audio section)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (1000ns min, 63750ns max)
Interrupt: pin A routed to IRQ 5
Region 0: Memory at ee004000 (32-bit, prefetchable) [size=4K]
Capabilities: [44] Vital Product Data
Capabilities: [4c] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:0c.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)
Subsystem: Unex Technology Corp. ND010
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (8000ns min, 16000ns max)
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at d000 [size=256]
Region 1: Memory at ee005000 (32-bit, non-prefetchable) [size=256]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA
PME(D0-,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:11.0 ISA bridge: VIA Technologies, Inc. VT8233A ISA Bridge
Subsystem: VIA Technologies, Inc.: Unknown device 0000
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping+ SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:11.1 IDE interface: VIA Technologies, Inc.
VT82C586A/B/VT82C686/A/B/VT823x/A/C/VT8235 PIPC Bus Master IDE (rev 06)
(prog-if 8a [Master SecP PriP])
Subsystem: VIA Technologies, Inc.
VT82C586/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32
Interrupt: pin A routed to IRQ 0
Region 4: I/O ports at d400 [size=16]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:11.2 USB Controller: VIA Technologies, Inc. VT6202 [USB 2.0 controller]
(rev 23) (prog-if 00 [UHCI])
Subsystem: VIA Technologies, Inc. (Wrong ID) USB Controller
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32, cache line size 08
Interrupt: pin D routed to IRQ 10
Region 4: I/O ports at d800 [size=32]
Capabilities: [80] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:11.3 USB Controller: VIA Technologies, Inc. VT6202 [USB 2.0 controller]
(rev 23) (prog-if 00 [UHCI])
Subsystem: VIA Technologies, Inc. (Wrong ID) USB Controller
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32, cache line size 08
Interrupt: pin D routed to IRQ 10
Region 4: I/O ports at dc00 [size=32]
Capabilities: [80] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237
AC97 Audio Controller (rev 40)
Subsystem: C-Media Electronics Inc: Unknown device 0301
Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin C routed to IRQ 5
Region 0: I/O ports at e000 [size=256]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

01:00.0 VGA compatible controller: nVidia Corporation NV11 [GeForce2 MX/MX
400] (rev b2) (prog-if 00 [VGA])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (1250ns min, 250ns max)
Interrupt: pin A routed to IRQ 11
Region 0: Memory at ec000000 (32-bit, non-prefetchable) [size=16M]
Region 1: Memory at e0000000 (32-bit, prefetchable) [size=128M]
Expansion ROM at <unassigned> [disabled] [size=64K]
Capabilities: [60] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [44] AGP version 2.0
Status: RQ=31 SBA- 64bit- FW+ Rate=x1,x2
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>

[7.6] cat /proc/scsi/scsi
cat: /proc/scsi/scsi: No such file or directory

[7.7] Other information.

a) If I turn scsi emulation back on (hdc=scsi argument to vmlinuz), both udf
and ext2 on cdmrw work reliably under 2.6.6 (not tested under 2.6.5)

b) I can also reliably use udf via packet writing through the patch maintained
by Peter Osterlund and cdmrwtool from the udftools package.

c) Recording CDR/RW through cdrtools works perfectly, every time.

d) A similar, if not identical, problem was posted on 17 March 2004
( http://marc.theaimsgroup.com/?l=linux-kernel&m=107955822109371&w=2 ), but
received no response.
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