Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Eric M]

i have a plextor cd-rw drive which i use via scsi emulation, it is the 
only device on my second ide bus.

often when i rip cds with grip that have scratches, grip completely 
stops responding to input and signals, even -9 wont go through. today i 
tried waiting for over half an hour for it to terminate, got bored and 
quit X. the grip process died after doing that but the kernel's scsi 
layer kept spewing error messages on my console and my machine "lagged" 
on about 10-15 second intervals a few seconds at a time. i waited over 
an hour for it to give up, but it didn't so i had to reboot. kernel 
version i'm using is 2.4.17.
-- 

__
Ota itsellesi luotettava kotimainen email http://www.jippii.fi/
Tutustu samalla netin parhaaseen pelipaikkaan JIPPIIGAMESIIN.

A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Dr. Death]

Problem:

I use SuSE Linux 7.2 and when I create md5sums from damaged files on a 
CD, the WHOLE system  freezes or is ugly slow untill md5 has passed the 
damaged part of the file !

My CDRom drive is a HP8100i  IDE CD Writer attached as HDD at the onbord 
IDE Controller



test case:

md5 "/cdrom/damaged file"



cat /proc/version output:

Linux version 2.4.4-4GB (root@Pentium.suse.de) (gcc version 2.95.3 
20010315 (SuSE)) #1 Wed May 16 00:37:55 GMT 2001



linux_ver output:

Linux filez 2.4.4-4GB #1 Wed May 16 00:37:55 GMT 2001 i586 unknown
 
Gnu C                  2.95.3
Gnu make               3.79.1
binutils               2.10.91.0.4
util-linux             2.11b
mount                  2.11b
modutils               2.4.5
e2fsprogs              1.19
reiserfsprogs          3.x.0j
PPP                    2.4.0
isdn4k-utils           3.1pre1a
Linux C Library        x    1 root     root      1343073 Mai 11  2001 
/lib/libc.so.6
Dynamic linker (ldd)   2.2.2
Procps                 2.0.7
Net-tools              1.60
Kbd                    1.04
Sh-utils               2.0
Modules Loaded         ppp_async ppp_generic nls_iso8859-1 snd-pcm-oss 
snd-pcm-plugin snd-mixer-oss snd-synth-emu8000 snd-synth-emux 
snd-seq-midi-emul snd-seq-virmidi snd-emux-mem snd-seq-midi 
snd-seq-midi-event snd-seq snd-card-sbawe isa-pnp snd-sb16-csp 
snd-sb16-dsp snd-pcm snd-mixer snd-opl3 snd-hwdep snd-timer 
snd-mpu401-uart snd-rawmidi snd-seq-device snd soundcore af_packet nfsd 
lp parport usbcore ne2k-pci 8390 hisax isdn loop_fish2 ide-scsi rtl8139 
reiserfs



cat /proc/cpuinfo output:

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 5
model           : 7
model name      : AMD-K6tm w/ multimedia extensions
stepping        : 0
cpu MHz         : 267.281
cache size      : 64 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 mce cx8 mmx
bogomips        : 532.48



cat /proc/modules output:

ppp_async               6480   0 (autoclean) (unused)
ppp_generic            14416   0 (autoclean) [ppp_async]
nls_iso8859-1           2880   1 (autoclean)
snd-pcm-oss            18816   1 (autoclean)
snd-pcm-plugin         15024   0 (autoclean) [snd-pcm-oss]
snd-mixer-oss           5120   0 (autoclean) [snd-pcm-oss]
snd-synth-emu8000      16176   0 (unused)
snd-synth-emux         26592   0 [snd-synth-emu8000]
snd-seq-midi-emul       4480   0 [snd-synth-emux]
snd-seq-virmidi         8496   0 [snd-synth-emux]
snd-emux-mem            1616   0 [snd-synth-emu8000 snd-synth-emux]
snd-seq-midi            3568   0 (unused)
snd-seq-midi-event      2992   0 [snd-seq-virmidi snd-seq-midi]
snd-seq                42656   0 [snd-synth-emux snd-seq-virmidi 
snd-seq-midi snd-seq-midi-event]
snd-card-sbawe          5536   1
isa-pnp                28176   0 [snd-card-sbawe]
snd-sb16-csp           15888   0 [snd-card-sbawe]
snd-sb16-dsp           15888   0 [snd-card-sbawe snd-sb16-csp]
snd-pcm                30560   0 [snd-pcm-oss snd-pcm-plugin snd-sb16-dsp]
snd-mixer              24224   0 [snd-mixer-oss snd-synth-emu8000 
snd-sb16-csp snd-sb16-dsp]
snd-opl3                4848   0 [snd-card-sbawe]
snd-hwdep               3376   0 [snd-sb16-csp snd-opl3]
snd-timer               8560   0 [snd-seq snd-pcm snd-opl3]
snd-mpu401-uart         2512   0 [snd-card-sbawe]
snd-rawmidi             9664   0 [snd-seq-midi snd-mpu401-uart]
snd-seq-device          4032   0 [snd-synth-emu8000 snd-synth-emux 
snd-seq-midi snd-seq snd-card-sbawe snd-rawmidi]
snd                    34032   1 [snd-pcm-oss snd-pcm-plugin 
snd-mixer-oss snd-synth-emu8000 snd-synth-emux snd-seq-virm
idi snd-emux-mem snd-seq-midi snd-seq-midi-event snd-seq snd-card-sbawe 
snd-sb16-csp snd-sb16-dsp snd-pcm snd-mixer snd-
opl3 snd-hwdep snd-timer snd-mpu401-uart snd-rawmidi snd-seq-device]
soundcore               3632   7 [snd]
af_packet              11648   2 (autoclean)
nfsd                   67280   4 (autoclean)
lp                      5392   0 (autoclean)
parport                24352   0 (autoclean) [lp]
usbcore                47120   0 (autoclean)
ne2k-pci                4640   1 (autoclean)
8390                    6240   0 (autoclean) [ne2k-pci]
hisax                 496192   1
isdn                  123056   2 [hisax]
loop_fish2              9280   0 (unused)
ide-scsi                7856   1
rtl8139                11520   1
reiserfs              156432   3




cat /proc/ioports output:

0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0070-007f : rtc
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : ide1
01f0-01f7 : ide0
0213-0213 : isapnp read
0220-022f : Sound Blaster AWE32/64
0330-0331 : Sound Blaster AWE32/64 - MPU-401
0376-0376 : ide1
0388-038b : Sound Blaster AWE32/64 - FM
03c0-03df : vga+
03f6-03f6 : ide0
0620-0623 : Sound Blaster AWE32/64 - WaveTable
0a20-0a23 : Sound Blaster AWE32/64 - WaveTable
0a79-0a79 : isapnp write
0cf8-0cff : PCI conf1
0e20-0e23 : Sound Blaster AWE32/64 - WaveTable
4000-40ff : PCI device 1106:3040
c000-cfff : PCI Bus #01
d000-d00f : PCI device 1106:0571
  d000-d007 : ide0
  d008-d00f : ide1
d800-d8ff : PCI device 10ec:8139
  d800-d8ff : 8139too
dc00-dc1f : PCI device 1244:0a00
  dc00-dc1f : avm PCI
e000-e01f : PCI device 10ec:8029
  e000-e01f : ne2k-pci




cat /proc/iomem  output:

00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-0fffffff : System RAM
  00100000-002327d1 : Kernel code
  002327d2-0031bdcb : Kernel data
e0000000-e3ffffff : PCI device 1106:0598
e4000000-e40000ff : PCI device 10ec:8139
  e4000000-e40000ff : 8139too
e4001000-e400101f : PCI device 1244:0a00
ffff0000-ffffffff : reserved




lspci -vvv output:

00:00.0 Host bridge: VIA Technologies, Inc. VT82C598 [Apollo MVP3] (rev 04)
        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 e0000000 (32-bit, prefetchable) [size=64M]
        Capabilities: [a0] AGP version 1.0
                Status: RQ=7 SBA+ 64bit- FW- Rate=x1,x2
                Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>

00:01.0 PCI bridge: VIA Technologies, Inc. VT82C598/694x [Apollo 
MVP3/Pro133x 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: 0000c000-0000cfff
        Memory behind bridge: fff00000-000fffff
        Prefetchable memory behind bridge: fff00000-000fffff
        BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-

00:07.0 ISA bridge: VIA Technologies, Inc. VT82C586/A/B PCI-to-ISA 
[Apollo VP] (rev 47)
        Subsystem: VIA Technologies, Inc. MVP3 ISA Bridge
        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

00:07.1 IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 06) 
(prog-if 8a [Master SecP PriP])
        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: 64
        Region 4: I/O ports at d000 [size=16]

00:07.3 Host bridge: VIA Technologies, Inc. VT82C586B ACPI (rev 10)
        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-

00:12.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139 
(rev 10)
        Subsystem: Realtek Semiconductor Co., Ltd. RT8139
        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: 64 (8000ns min, 16000ns max)
        Interrupt: pin A routed to IRQ 11
        Region 0: I/O ports at d800 [size=256]
        Region 1: Memory at e4000000 (32-bit, non-prefetchable) [size=256]
        Capabilities: [50] 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-

00:13.0 Network controller: AVM Audiovisuelles MKTG & Computer System 
GmbH A1 ISDN [Fritz] (rev 02)
        Subsystem: AVM Audiovisuelles MKTG & Computer System GmbH 
FRITZ!Card ISDN 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-
        Interrupt: pin A routed to IRQ 5
        Region 0: Memory at e4001000 (32-bit, non-prefetchable) [size=32]
        Region 1: I/O ports at dc00 [size=32]

00:14.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8029(AS)
        Subsystem: Realtek Semiconductor Co., Ltd. RT8029(AS)
        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 A routed to IRQ 7
        Region 0: I/O ports at e000 [size=32]




cat /proc/scsi/scsi output:

Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: HP       Model: CD-Writer+ 8100  Rev: 1.0g
  Type:   CD-ROM                           ANSI SCSI revision: 02



/var/log/messages

Apr 18 15:06:18 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x03 00 00 00 40 00
Apr 18 15:06:20 filez kernel: hdd: irq timeout: status=0xd0 { Busy }
Apr 18 15:06:20 filez kernel: hdd: ATAPI reset complete
Apr 18 15:06:20 filez kernel: hdd: irq timeout: status=0x80 { Busy }
Apr 18 15:06:20 filez kernel: hdd: ATAPI reset complete
Apr 18 15:06:21 filez kernel: hdd: irq timeout: status=0x80 { Busy }
Apr 18 15:06:21 filez kernel: hdd: status error: status=0x08 { DataRequest }
Apr 18 15:06:21 filez kernel: hdd: drive not ready for command
Apr 18 15:06:21 filez kernel: SCSI cdrom error : host 0 channel 0 id 0 
lun 0 return code = 27000002
Apr 18 15:06:21 filez kernel:  I/O error: dev 0b:00, sector 5780
Apr 18 15:06:51 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x28 00 00 00 05 24 00 00 39 00
Apr 18 15:06:51 filez kernel: SCSI host 0 abort (pid 0) timed out - 
resetting
Apr 18 15:06:51 filez kernel: SCSI bus is being reset for host 0 channel 0.
Apr 18 15:06:51 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x28 00 00 00 05 24 00 00 39 00
Apr 18 15:06:51 filez kernel: SCSI host 0 abort (pid 0) timed out - 
resetting
Apr 18 15:06:51 filez kernel: SCSI bus is being reset for host 0 channel 0.
Apr 18 15:06:52 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x28 00 00 00 05 24 00 00 39 00
Apr 18 15:06:52 filez kernel: SCSI host 0 abort (pid 0) timed out - 
resetting
Apr 18 15:06:52 filez kernel: SCSI bus is being reset for host 0 channel 0.
Apr 18 15:06:52 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x28 00 00 00 05 24 00 00 39 00
Apr 18 15:06:52 filez kernel: SCSI host 0 abort (pid 0) timed out - 
resetting
Apr 18 15:06:52 filez kernel: SCSI bus is being reset for host 0 channel 0.
Apr 18 15:06:53 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x28 00 00 00 05 24 00 00 39 00
Apr 18 15:06:53 filez kernel: SCSI host 0 abort (pid 0) timed out - 
resetting
Apr 18 15:06:53 filez kernel: SCSI bus is being reset for host 0 channel 0.
Apr 18 15:06:53 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x28 00 00 00 05 24 00 00 39 00
Apr 18 15:06:53 filez kernel: SCSI host 0 abort (pid 0) timed out - 
resetting
Apr 18 15:06:53 filez kernel: SCSI bus is being reset for host 0 channel 0.
Apr 18 15:06:54 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x28 00 00 00 05 24 00 00 39 00
Apr 18 15:06:54 filez kernel: SCSI host 0 abort (pid 0) timed out - 
resetting
Apr 18 15:06:54 filez kernel: SCSI bus is being reset for host 0 channel 0.
Apr 18 15:06:54 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x28 00 00 00 05 24 00 00 39 00
Apr 18 15:06:54 filez kernel: SCSI host 0 abort (pid 0) timed out - 
resetting
Apr 18 15:06:54 filez kernel: SCSI bus is being reset for host 0 channel 0.
Apr 18 15:06:55 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x28 00 00 00 05 24 00 00 39 00
Apr 18 15:06:55 filez kernel: SCSI host 0 abort (pid 0) timed out - 
resetting
Apr 18 15:06:55 filez kernel: SCSI bus is being reset for host 0 channel 0.
Apr 18 15:06:55 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x28 00 00 00 05 24 00 00 39 00
Apr 18 15:06:55 filez kernel: SCSI host 0 abort (pid 0) timed out - 
resetting
Apr 18 15:06:55 filez kernel: SCSI bus is being reset for host 0 channel 0.
Apr 18 15:06:56 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x28 00 00 00 05 24 00 00 39 00
Apr 18 15:06:56 filez kernel: SCSI host 0 abort (pid 0) timed out - 
resetting
Apr 18 15:06:56 filez kernel: SCSI bus is being reset for host 0 channel 0.
Apr 18 15:06:56 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x28 00 00 00 05 24 00 00 39 00
Apr 18 15:06:56 filez kernel: SCSI host 0 abort (pid 0) timed out - 
resetting
Apr 18 15:06:56 filez kernel: SCSI bus is being reset for host 0 channel 0.
Apr 18 15:06:57 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x28 00 00 00 05 24 00 00 39 00
Apr 18 15:06:57 filez kernel: SCSI host 0 abort (pid 0) timed out - 
resetting
Apr 18 15:06:57 filez kernel: SCSI bus is being reset for host 0 channel 0.
Apr 18 15:06:59 filez kernel: scsi : aborting command due to timeout : 
pid 0, scsi0, channel 0, id 0, lun 0 0x03 00 00 00 40 00
Apr 18 15:06:59 filez kernel: hdd: irq timeout: status=0xd0 { Busy }
Apr 18 15:06:59 filez kernel: hdd: ATAPI reset complete
Apr 18 15:06:59 filez kernel: hdd: irq timeout: status=0x80 { Busy }
Apr 18 15:06:59 filez kernel: hdd: ATAPI reset complete





Have i forget something ? If yes just Mail me

Frederik Reiss

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Richard B. Johnson]

On Thu, 18 Apr 2002, Dr. Death wrote:

> Problem:
> 
> I use SuSE Linux 7.2 and when I create md5sums from damaged files on a 
> CD, the WHOLE system  freezes or is ugly slow untill md5 has passed the 
> damaged part of the file !
> 

So what do you suggest? You can see from the logs that the device
is having difficulty  reading your damaged CD. You can do what
Windows-95 does (ignore the errors and pretend everything is fine),
or what Windows-98 and Windows-2000/Prof does (blue-screen, and re-boot),
or you can try like hell to read the files like Linux does. What do you
suggest?

Cheers,
Dick Johnson

Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).

                 Windows-2000/Professional isn't.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Kent Borg]

On Fri, Apr 19, 2002 at 10:14:41AM -0400, Richard B. Johnson wrote:
> On Thu, 18 Apr 2002, Dr. Death wrote:
> 
> > Problem:
> > 
> > I use SuSE Linux 7.2 and when I create md5sums from damaged files on a 
> > CD, the WHOLE system  freezes or is ugly slow untill md5 has passed the 
> > damaged part of the file !
> > 
> 
> So what do you suggest? You can see from the logs that the device
> is having difficulty  reading your damaged CD. You can do what
> Windows-95 does (ignore the errors and pretend everything is fine),
> or what Windows-98 and Windows-2000/Prof does (blue-screen, and re-boot),
> or you can try like hell to read the files like Linux does. What do you
> suggest?

You didn't ask me, but I would still suggest that it would be nice if
the whole system didn't come to a near halt.


-kb, the Kent who wonders of the preemption patch might help here.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Richard B. Johnson]

On Fri, 19 Apr 2002, Kent Borg wrote:

> On Fri, Apr 19, 2002 at 10:14:41AM -0400, Richard B. Johnson wrote:
> > On Thu, 18 Apr 2002, Dr. Death wrote:
> > 
> > > Problem:
> > > 
> > > I use SuSE Linux 7.2 and when I create md5sums from damaged files on a 
> > > CD, the WHOLE system  freezes or is ugly slow untill md5 has passed the 
> > > damaged part of the file !
> > > 
> > 
> > So what do you suggest? You can see from the logs that the device
> > is having difficulty  reading your damaged CD. You can do what
> > Windows-95 does (ignore the errors and pretend everything is fine),
> > or what Windows-98 and Windows-2000/Prof does (blue-screen, and re-boot),
> > or you can try like hell to read the files like Linux does. What do you
> > suggest?
> 
> You didn't ask me, but I would still suggest that it would be nice if
> the whole system didn't come to a near halt.
> 

Some time-outs are enforced by hardware, some errors even result in
a bus reset in which all the devices reload their firmware, etc.
Therefore time-outs are made quite long so one has to wait for a
relatively long to either retry or to give up upon an error. It
is possible to dynamically determine the kind of time-out necessary
for a particular error in a particular device. This could be
determined, for instance, when a device is mounted or otherwise
first accessed. However, then there would be complaints about
the amount of time necessary to mount a device, etc.

So, basically, the compromise seems to be that bad devices or
bad media result in long-time retries.

Note, if you have another task, that is not trying to use the
errored device or its bus, it does not get starved for CPU time.
The kernel still sleeps while waiting for pass/fail interrupts,
therefore giving the CPU to somebody. Of course this doesn't
help the task that's accessing the device, and to that task the
system seems to, as you say, come to a near halt. 

FYI "Dr. Death" is phony and email to that node gets bounced.

Cheers,
Dick Johnson

Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).

                 Windows-2000/Professional isn't.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Darrell Wright]

I agree, I frequently find myself getting files off damages cd's that
others running windows cannot access.  It takes a while, but I can
usually get everything but the files on the damaged parts and even then
I can get parts of them usually.

Darrell

On Fri, 2002-04-19 at 10:14, Richard B. Johnson wrote:
> On Thu, 18 Apr 2002, Dr. Death wrote:
> 
> > Problem:
> > 
> > I use SuSE Linux 7.2 and when I create md5sums from damaged files on a 
> > CD, the WHOLE system  freezes or is ugly slow untill md5 has passed the 
> > damaged part of the file !
> > 
> 
> So what do you suggest? You can see from the logs that the device
> is having difficulty  reading your damaged CD. You can do what
> Windows-95 does (ignore the errors and pretend everything is fine),
> or what Windows-98 and Windows-2000/Prof does (blue-screen, and re-boot),
> or you can try like hell to read the files like Linux does. What do you
> suggest?
> 
> Cheers,
> Dick Johnson
> 
> Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).
> 
>                  Windows-2000/Professional isn't.
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[dr john halewood]

On Friday 19 April 2002 3:14 pm, Richard B. Johnson wrote:
> So what do you suggest? You can see from the logs that the device
> is having difficulty  reading your damaged CD. You can do what
> Windows-95 does (ignore the errors and pretend everything is fine),
> or what Windows-98 and Windows-2000/Prof does (blue-screen, and re-boot),
> or you can try like hell to read the files like Linux does. What do you
> suggest?
>
Don't put them in an Xbox in the first place? (see 
http://www.newscientist.com/news/news.jsp?id=ns99992000)

cheers
john

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Oliver Xymoron]

On Fri, 19 Apr 2002, Richard B. Johnson wrote:

> On Thu, 18 Apr 2002, Dr. Death wrote:
>
> > Problem:
> >
> > I use SuSE Linux 7.2 and when I create md5sums from damaged files on a
> > CD, the WHOLE system  freezes or is ugly slow untill md5 has passed the
> > damaged part of the file !
> >
>
> So what do you suggest? You can see from the logs that the device
> is having difficulty  reading your damaged CD. You can do what
> Windows-95 does (ignore the errors and pretend everything is fine),
> or what Windows-98 and Windows-2000/Prof does (blue-screen, and re-boot),
> or you can try like hell to read the files like Linux does. What do you
> suggest?

The problem is not that reading the disk is slow, it's that it brings the
system to its knees. There are many valid scenarios where non-root users
should be able to put CDs in a machine and they shouldn't be able to DoS
it by doing so.

Fact is the SCSI layer's error handling has been on the list of things in
dire need of replacement for years and this is one of the many symptoms.

-- 
 "Love the dolphins," she advised him. "Write by W.A.S.T.E.."

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Bill Davidsen]

On Fri, 19 Apr 2002, Richard B. Johnson wrote:

> On Thu, 18 Apr 2002, Dr. Death wrote:
> 
> > Problem:
> > 
> > I use SuSE Linux 7.2 and when I create md5sums from damaged files on a 
> > CD, the WHOLE system  freezes or is ugly slow untill md5 has passed the 
> > damaged part of the file !
> > 
> 
> So what do you suggest? You can see from the logs that the device
> is having difficulty  reading your damaged CD. You can do what
> Windows-95 does (ignore the errors and pretend everything is fine),
> or what Windows-98 and Windows-2000/Prof does (blue-screen, and re-boot),
> or you can try like hell to read the files like Linux does. What do you
> suggest?

Several things come to mind:
1 - don't dedicate the entire machine to retrying the error such that
    everything else runs slowly if at all.
2 - if the hardware returns an uncorrectable sector error that should be
    passed back to the user process rather than retried. An unconditional
    deep retry on an error the hardware labels as uncorrectable is not
    desirable, and not better than the Windows in most cases.

I took a bottle cap to one of the morning's AOL CDs and then tried to read
it. It's really not just annoying, it's pretty much useless. If you were
staging software off a CD on a running server, your clients would NOT be
happy!

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Richard B. Johnson]

On Tue, 23 Apr 2002, Bill Davidsen wrote:

> On Fri, 19 Apr 2002, Richard B. Johnson wrote:
> 
> > On Thu, 18 Apr 2002, Dr. Death wrote:
> > 
> > > Problem:
> > > 
> > > I use SuSE Linux 7.2 and when I create md5sums from damaged files on a 
> > > CD, the WHOLE system  freezes or is ugly slow untill md5 has passed the 
> > > damaged part of the file !
> > > 
> > 
> > So what do you suggest? You can see from the logs that the device
> > is having difficulty  reading your damaged CD. You can do what
> > Windows-95 does (ignore the errors and pretend everything is fine),
> > or what Windows-98 and Windows-2000/Prof does (blue-screen, and re-boot),
> > or you can try like hell to read the files like Linux does. What do you
> > suggest?
> 
> Several things come to mind:
> 1 - don't dedicate the entire machine to retrying the error such that
>     everything else runs slowly if at all.

But it doesn't! As previously stated, if you have a device on a common
'channel' (like IDE), that everybody else is trying to use, then
everybody else ends up waiting. However, if your errored devices don't
take over a common I/O channel, everybody else gets the CPU while the
errors are being retried.

For instance, I have SCSI for my disks, and I use IDE for a R/W CD
because it's cheap. I can "try forever" reading dorked CDs and the
only process affected at all is the one trying to read the CD. I
can do full-speed compiles while the CD is being retried.

It's all about configuration. The kernel drivers sleep while waiting
for interrupts that will determine the success or failure of the
disk operation. The 'sleep' means that the CPU gets given to somebody
who could use it.


> 2 - if the hardware returns an uncorrectable sector error that should be
>     passed back to the user process rather than retried. An unconditional
>     deep retry on an error the hardware labels as uncorrectable is not
>     desirable, and not better than the Windows in most cases.
> 

The problem is that the hardware usually waits for the worse-case time
(disk spin-up time) to even report an error. It's not like you could
somehow wait for one rev of the disk to determine if a sector could
be read. The disk, itself, retries for a long time, then it reports
a rather general-purpose error (media error on SCSI, bad sector on
IDE, record not found, etc).

> I took a bottle cap to one of the morning's AOL CDs and then tried to read
> it. It's really not just annoying, it's pretty much useless. If you were
> staging software off a CD on a running server, your clients would NOT be
> happy!
> 

Put your CDs on a different controller and you can do anything you
want without affecting other tasks.

Cheers,
Dick Johnson

Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).

                 Windows-2000/Professional isn't.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Bill Davidsen]

On Wed, 24 Apr 2002, Richard B. Johnson wrote:

> On Tue, 23 Apr 2002, Bill Davidsen wrote:

> > Several things come to mind:
> > 1 - don't dedicate the entire machine to retrying the error such that
> >     everything else runs slowly if at all.
> 
> But it doesn't! As previously stated, if you have a device on a common
> 'channel' (like IDE), that everybody else is trying to use, then
> everybody else ends up waiting. However, if your errored devices don't
> take over a common I/O channel, everybody else gets the CPU while the
> errors are being retried.
> 
> For instance, I have SCSI for my disks, and I use IDE for a R/W CD
> because it's cheap. I can "try forever" reading dorked CDs and the
> only process affected at all is the one trying to read the CD. I
> can do full-speed compiles while the CD is being retried.

That's very nice for a system where cost is no object, but ATAPI/IDE is
where the bulk of Linux system are running. Putting the CD on another
cable is realistic (the system I hung does that) but putting the CD on IDE
and the disk on SCSI is not cost effective compared to fixing the hang in
software.
 
> It's all about configuration. The kernel drivers sleep while waiting
> for interrupts that will determine the success or failure of the
> disk operation. The 'sleep' means that the CPU gets given to somebody
> who could use it.

It would also be nice if the other IDE channels were given to "somebody
who could use it," but that would appear in some cases not to happen.

> > I took a bottle cap to one of the morning's AOL CDs and then tried to read
> > it. It's really not just annoying, it's pretty much useless. If you were
> > staging software off a CD on a running server, your clients would NOT be
> > happy!
> > 
> 
> Put your CDs on a different controller and you can do anything you
> want without affecting other tasks.

  As above, another type of bus is not cost effective, another IDE cable
doesn't solve the problem, no matter what theory says. 

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Richard B. Johnson]

On Wed, 24 Apr 2002, Bill Davidsen wrote:

> On Wed, 24 Apr 2002, Richard B. Johnson wrote:
> 
> > On Tue, 23 Apr 2002, Bill Davidsen wrote:
> 
> > > Several things come to mind:
> > > 1 - don't dedicate the entire machine to retrying the error such that
> > >     everything else runs slowly if at all.
> > 
> > But it doesn't! As previously stated, if you have a device on a common
> > 'channel' (like IDE), that everybody else is trying to use, then
> > everybody else ends up waiting. However, if your errored devices don't
> > take over a common I/O channel, everybody else gets the CPU while the
> > errors are being retried.
> > 
> > For instance, I have SCSI for my disks, and I use IDE for a R/W CD
> > because it's cheap. I can "try forever" reading dorked CDs and the
> > only process affected at all is the one trying to read the CD. I
> > can do full-speed compiles while the CD is being retried.
> 
> That's very nice for a system where cost is no object, but ATAPI/IDE is
> where the bulk of Linux system are running. Putting the CD on another
> cable is realistic (the system I hung does that) but putting the CD on IDE
> and the disk on SCSI is not cost effective compared to fixing the hang in
> software.
>  

It is NOT a hang in the software. IDE means Integrated Drive Electronics.
The ONLY thing the CPU has to work with is the electronics IN the drive.
It communicates with the drive from a port on the mother-board. There
is no controller on the motherboard. There is absolutely nothing to
isolate one drive from another. A single drive, doing its retries will
"own" that drive-cable until it has either succeded or given up.

The CPU software MUST NOT do anything on that port until the previous
request was answered via interrupt. This means that if the CD is
using the bus, no task can access any hard-disk drive that is on
that same port.

You can see that there is plenty of CPU time available by having
one task do;

while true; do echo "Hello World!"; done

(before you access you damaged CD).

Then, using another VT, access your damaged CD.

When you switch to the 'Hello world' terminal, it's merrily spinning
along, getting all the CPU time your other task would have gotten
if the drive was readable.

> > It's all about configuration. The kernel drivers sleep while waiting
> > for interrupts that will determine the success or failure of the
> > disk operation. The 'sleep' means that the CPU gets given to somebody
> > who could use it.
> 
> It would also be nice if the other IDE channels were given to "somebody
> who could use it," but that would appear in some cases not to happen.
> 

There are no other IDE channels to give up. The 'master/save'
configuration should be labled 'cheaper' and the two/channel
configuration should be labeled 'cheapest'. It's what you pay
for. It has nothing to do with the kernel or its drivers.
Recent work on IDE was an attempt to get DMA operations and
other 'speed-up' operations to work better. They will never
work well because IDE is not designed to work well. It's
designed to simply exist.

[SNIPPED...]


Cheers,
Dick Johnson

Penguin : Linux version 2.4.1 on an i686 machine (797.90 BogoMips).

                 Windows-2000/Professional isn't.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Stephen Samuel]

I have a system with 2 hard disks (on separate controllers) and a CD-ROM
on the second controller (shared with the disk that, among other things)
handles /usr.

I took an old data CD, scratched  took a fork to it and mounted it.
I then started up MMX playing 'Hotel California' and tried to wc(1)
a 700K file on the CD.not too bad not too bad not too bad

Hotel California played fine, but trying to do an 'ls' of /usr
(same controller) took a LONG time..... (had to wait fnot too bad or the
CD to release the controller).

I could wc larg files in my /tmp directory, play music etc
before that WC came back -- I could do anything I wanted,
as long as I didn't need any data off of that second controller
(e.g. loading programs in /usr would die, since that HD shares
controller with the CD).

Given that I rarely use my CD ROM, it's fine having / and /usr
separated... On the other hand, if I was trying to read damaged CDs
with any regularity, I'd be making sure that the CD ROM drive was
sitting on it's own controller -- even if it meant putting all the
other IO on the system onto one IDE drive/controller.

> where the bulk of Linux system are running. Putting the CD on another
> cable is realistic (the system I hung does that) but putting the CD on IDE
> and the disk on SCSI is not cost effective compared to fixing the hang in
> software.

Note that this problem is a HARDWARE one -- not a software one.
It's kinda like trying to cross a Singapore highway... You can
do it faster, if you don't mind dealing with the nasty side of
a (data) bus. (read: SPLAT)

Bus error: car dumped.

(and if you think Linux is bad, try doing the same thing in
Windows!).

-- 
Stephen Samuel +1(604)876-0426                samuel@bcgreen.com
		   http://www.bcgreen.com/~samuel/
Powerful committed communication, reaching through fear, uncertainty and
doubt to touch the jewel within each person and bring it to life.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Bill Davidsen]

On Wed, 24 Apr 2002, Stephen Samuel wrote:

> I said:
> > where the bulk of Linux system are running. Putting the CD on another
> > cable is realistic (the system I hung does that) but putting the CD on IDE
> > and the disk on SCSI is not cost effective compared to fixing the hang in
> > software.
> 
> Note that this problem is a HARDWARE one -- not a software one.
> It's kinda like trying to cross a Singapore highway... You can
> do it faster, if you don't mind dealing with the nasty side of
> a (data) bus. (read: SPLAT)

I don't know how to say this any other way, reread my second sentence
again. I have the disk and CD on separate cables, it still hangs. I NEVER
mix a CD with anything and expect good response. The IDE devices are
hanging, not just the one sharing the cable, nothing shares the cable but
a ZIP drive I use a few times a year when someone sends me a ZIP,
otherwise it's unused. The disk drive is all by itself, as I said the
first time I mentioned this.

I suspect (without having a good way to check) that all IDE devices
sharing the IRQ with the error device *may* be affected. That's the only
thing which comes to mind, I'll add a Promise controller and disk on a
totally separate board and see if that changes anything. Hopefully it will
not share the IRQ :-(

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Mike Fedyk]

On Wed, Apr 24, 2002 at 11:33:23PM -0400, Bill Davidsen wrote:
> I suspect (without having a good way to check) that all IDE devices
> sharing the IRQ with the error device *may* be affected. That's the only
> thing which comes to mind, I'll add a Promise controller and disk on a
> totally separate board and see if that changes anything. Hopefully it will
> not share the IRQ :-(

I don't think it has to do with the IRQs, but it sounds like the entire ide
chipset (think two cables one one chipset...) has stopped responding when
ONE device (out of a possible four (with two cables)) has failed media.

Let's use an example to help shine the light on exactly what I'm saying (I'm
trying to summarize what's been said in the threads, and I haven't tested
this... though I will be working on such a system in the next few weeks):

1)
Two drives each on a seperate cable, but on the same chipset:
/dev/hda (hard drive) (chipset1)
/dev/hdc (cd-rom) (chipset1)

Put broken CD into /dev/hdc, and read somehow (dd, cat, whatever), now try
to read from /dev/hda.  This (according to this thread) should be damn slow
and you will have a very hard time to use this system while it is trying to
read the CD.

2)
Two drives, each on a seperate cable and on different chipsets:
/dev/hda (hard drive) (chipset1)
/dev/hde (cd-rom) (chipset2)

Put broken CD into /dev/hde, read it again, and try to read from /dev/hda.
All should be good, with blue skies, and a responsive system.

Can someone verify that the above is true, and acurately expresses
what they've experienced?

Also, can someone say for sure (Andre) that this is a hardware limitation,
not a Linux IDE locking problem, and with no possibility of a software
work-around? 

Thanks,

Mike

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Erik Andersen]

On Thu Apr 25, 2002 at 09:04:57PM -0700, Mike Fedyk wrote:
> 1)
> Two drives each on a seperate cable, but on the same chipset:
> /dev/hda (hard drive) (chipset1)
> /dev/hdc (cd-rom) (chipset1)
> 
> Put broken CD into /dev/hdc, and read somehow (dd, cat, whatever), now try
> to read from /dev/hda.  This (according to this thread) should be damn slow
> and you will have a very hard time to use this system while it is trying to
> read the CD.

This has not been my experience.  Reading from hda continues to
work as expected.  But the process reading from hdc stays stuck
in D state for a _long_ time....  A kill -9 takes like 10 minutes
before it gets around to actually killing anything.

> 2)
> Two drives, each on a seperate cable and on different chipsets:
> /dev/hda (hard drive) (chipset1)
> /dev/hde (cd-rom) (chipset2)
> 
> Put broken CD into /dev/hde, read it again, and try to read from /dev/hda.
> All should be good, with blue skies, and a responsive system.

Sure.  Same as above.

> Also, can someone say for sure (Andre) that this is a hardware limitation,
> not a Linux IDE locking problem, and with no possibility of a software
> work-around? 

There is a certain amount of delay when a drive hits a bad
sector.  But Linux handles things pretty badly IMHO, and could 
do a much better job.

 -Erik

--
Erik B. Andersen             http://codepoet-consulting.com/
--This message was written using 73% post-consumer electrons--

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Andre Hedrick]

Basically it is a global design flaw from the beginning, and since I have
only 2.4 to address it is a real nasty!  Short version, each subdriver
personally does not do unique error handling.  Thus a the simple good/bad
approach to a darwin world has come to bite hard now.  There is a failure
to address error/sense decoding based on the operations requested to
perform.  Second the mainloop is ATA/IDE centered for all events and this
is in proccess to be fixed for 2.4 soon.  Third requires all ATAPI to
decode wrt to primary opcode executed and sense of the preferred event
tables and not the generic catch all.

It is a blood mess, and difficult to describe over email :-/ (for me).

Cheers,

Andre Hedrick
LAD Storage Consulting Group

PS Mike, "Mr. Hedrick" was my genetic donor, "Andre" is what I answer too.

On Thu, 25 Apr 2002, Mike Fedyk wrote:

> On Wed, Apr 24, 2002 at 11:33:23PM -0400, Bill Davidsen wrote:
> > I suspect (without having a good way to check) that all IDE devices
> > sharing the IRQ with the error device *may* be affected. That's the only
> > thing which comes to mind, I'll add a Promise controller and disk on a
> > totally separate board and see if that changes anything. Hopefully it will
> > not share the IRQ :-(
> 
> I don't think it has to do with the IRQs, but it sounds like the entire ide
> chipset (think two cables one one chipset...) has stopped responding when
> ONE device (out of a possible four (with two cables)) has failed media.
> 
> Let's use an example to help shine the light on exactly what I'm saying (I'm
> trying to summarize what's been said in the threads, and I haven't tested
> this... though I will be working on such a system in the next few weeks):
> 
> 1)
> Two drives each on a seperate cable, but on the same chipset:
> /dev/hda (hard drive) (chipset1)
> /dev/hdc (cd-rom) (chipset1)
> 
> Put broken CD into /dev/hdc, and read somehow (dd, cat, whatever), now try
> to read from /dev/hda.  This (according to this thread) should be damn slow
> and you will have a very hard time to use this system while it is trying to
> read the CD.
> 
> 2)
> Two drives, each on a seperate cable and on different chipsets:
> /dev/hda (hard drive) (chipset1)
> /dev/hde (cd-rom) (chipset2)
> 
> Put broken CD into /dev/hde, read it again, and try to read from /dev/hda.
> All should be good, with blue skies, and a responsive system.
> 
> Can someone verify that the above is true, and acurately expresses
> what they've experienced?
> 
> Also, can someone say for sure (Andre) that this is a hardware limitation,
> not a Linux IDE locking problem, and with no possibility of a software
> work-around? 
> 
> Thanks,
> 
> Mike
> 

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Pavel Machek]

Hi!

> Basically it is a global design flaw from the beginning, and since I have
> only 2.4 to address it is a real nasty!  Short version, each subdriver

Well, noone prevents you from submitting 2.5 patches to Martin.... Actually,
his cleanups maybe made that job easier.

								Pavel
-- 
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Andre Hedrick]

Well I really do not have the time to follow the changes, but when I fix
it in 2.4, please copy a and credit would be nice but not expected.  Also
it made resulted in a more complex mess to address.


Regards,

Andre Hedrick
LAD Storage Consulting Group


On Thu, 25 Apr 2002, Pavel Machek wrote:

> Hi!
> 
> > Basically it is a global design flaw from the beginning, and since I have
> > only 2.4 to address it is a real nasty!  Short version, each subdriver
> 
> Well, noone prevents you from submitting 2.5 patches to Martin.... Actually,
> his cleanups maybe made that job easier.
> 
> 								Pavel
> -- 
> Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
> details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
> 

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Mike Fedyk]

On Fri, Apr 26, 2002 at 12:35:55AM -0700, Andre Hedrick wrote:
> 
> Basically it is a global design flaw from the beginning, and since I have
> only 2.4 to address it is a real nasty!  Short version, each subdriver
> personally does not do unique error handling.  Thus a the simple good/bad
> approach to a darwin world has come to bite hard now.  There is a failure
> to address error/sense decoding based on the operations requested to
> perform.  Second the mainloop is ATA/IDE centered for all events and this
> is in proccess to be fixed for 2.4 soon.  Third requires all ATAPI to
> decode wrt to primary opcode executed and sense of the preferred event
> tables and not the generic catch all.
>
> It is a blood mess, and difficult to describe over email :-/ (for me).
>

Ok, so there is hope for a fix.  Andre, when you have the patches available,
I'm sure meny people from this thread would be willing to help test, just
announce.

Is there a place where you keep your latest patches with a little
documentation on the purpose of the changes?

> Cheers,
> 
> Andre Hedrick
> LAD Storage Consulting Group
> 
> PS Mike, "Mr. Hedrick" was my genetic donor, "Andre" is what I answer too.
> 

??  I think you're thinking of someone else.  Read below, I addressed you as
"Andre", and IIRC always have.  I understand personally the "genetic donor"
problem though. 

Mike

> > Also, can someone say for sure (Andre) that this is a hardware limitation,
> > not a Linux IDE locking problem, and with no possibility of a software
> > work-around? 
> > 
> > Thanks,
> > 
> > Mike

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Bill Davidsen]

On Fri, 26 Apr 2002, Andre Hedrick wrote:

> 
> Basically it is a global design flaw from the beginning, and since I have
> only 2.4 to address it is a real nasty!  Short version, each subdriver
> personally does not do unique error handling.

  I'm snipping because obviously lots of folks are reading the previous
posts. Since you clearly can see the issue, I will let this thread rest in
hopes that we will have a patch to try and that it will make the whole
problem shrink if not vanish.

  It seems the casual assumption that anyone who has a problem must be
putting both devices on the same cable has been laid to rest, time to wait
for new data and/or patches. I will try again next weekend to test the
same problem using a totally separate (Promise) controller for the CD.

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Mike Fedyk]

On Mon, Apr 29, 2002 at 05:46:28PM -0400, Bill Davidsen wrote:
> On Fri, 26 Apr 2002, Andre Hedrick wrote:
> 
> > 
> > Basically it is a global design flaw from the beginning, and since I have
> > only 2.4 to address it is a real nasty!  Short version, each subdriver
> > personally does not do unique error handling.
> 
>   I'm snipping because obviously lots of folks are reading the previous
> posts. Since you clearly can see the issue, I will let this thread rest in
> hopes that we will have a patch to try and that it will make the whole
> problem shrink if not vanish.
> 
>   It seems the casual assumption that anyone who has a problem must be
> putting both devices on the same cable has been laid to rest, time to wait
> for new data and/or patches. I will try again next weekend to test the
> same problem using a totally separate (Promise) controller for the CD.

I found a CD that was having trouble reading, and put it on a 12x cd-rom
drive at /dev/hdc (hda - d = PIIX3).  The hard drive is on the Promise
controller (hde - h = Promise 20262).  Currently there are only two drives
in this system.

I ran:
while true; do find / -xdev -type f -print0 |xargs -0 cat > /dev/null; done

vmstat 1 > /dev/tty9

Then I ran `dd conv=noerror < /dev/hdc > /dev/null` and saw many resets and errors.

Now while this is happening and I'm listening to the hard drive tick away,
and hear the cd-rom drive trying to read the CD, and watching the vmstat
output. All is working great and smooth.

Now, I moved the cd-rom drive over to the promise controller (/dev/hdg,
that's on the *same* controller, but *different* cables (remember, there's
no hope if it's on the same cable as that's an IDE hardware design issue))
and reran the above test, and it was smooth too.

This is with 2.4.19-pre6-vm33, I haven't tested with other kernels.

I'll be adding 3 zip100s, 1 zip250, 1 cd-rw, and 1 ls-120 drive to this
system over the next few days as time permits, so I'll do more testing and
report.  As you can see, it'll be a big issue on this system if one drive
dominates the entire system.

Can someone else test some other kernel versions/trees?  I'd like this to see more
systematic testing so we can see what exactly triggers the problem.  

Oh BTW, I have a cmd649 ide controller I can test too, and in a month or three
I'll be able to test on a via chipset (but with an intel processor though).

Mike

lspci:
00:07.1 IDE interface: Intel Corp. 82371SB PIIX3 IDE [Natoma/Triton II]
00:0b.0 Unknown mass storage controller: Promise Technology, Inc. 20262 (rev 01)

hde: IBM-DPTA-372730, ATA DISK drive
hdg: TOSHIBA CD-ROM XM-5702B, ATAPI CD/DVD-ROM drive

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Stephen Samuel]

I ran a similar type of test on a 2.4.9.31 (redhat 7.1 ) kernel.
With the CD on HDD, I could read off of HDA just peachy while
the system was choking on a scratched (aol) cd.

I did a WC of a 300MB file (only 256MB of ram on the system,
so that's guaranteed to not fit in any cache).

Times to read the file were statistically equivalent whether
the system was choking on the CD or not.
-- 
Stephen Samuel +1(604)876-0426                samuel@bcgreen.com
		   http://www.bcgreen.com/~samuel/
Powerful committed communication, reaching through fear, uncertainty and
doubt to touch the jewel within each person and bring it to life.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Xavier Bestel]

Le jeu 02/05/2002 à 10:26, Stephen Samuel a écrit :
> I ran a similar type of test on a 2.4.9.31 (redhat 7.1 ) kernel.
> With the CD on HDD, I could read off of HDA just peachy while
> the system was choking on a scratched (aol) cd.

The "system grinding to a halt" happens to me too, when *ripping*
scratched cds. Note that it's when using *userspace* access to the block
device, with e.g. cdparanoia or grip (or dvd ripping tools).

My DVD drive is on a VT82C693A/694x (ABit VP6).

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Zwane Mwaikambo]

On 2 May 2002, Xavier Bestel wrote:

> The "system grinding to a halt" happens to me too, when *ripping*
> scratched cds. Note that it's when using *userspace* access to the block
> device, with e.g. cdparanoia or grip (or dvd ripping tools).

What does your system time usage look like?

-- 
http://function.linuxpower.ca
		

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Xavier Bestel]

Le jeu 02/05/2002 à 10:43, Zwane Mwaikambo a écrit :
> On 2 May 2002, Xavier Bestel wrote:
> 
> > The "system grinding to a halt" happens to me too, when *ripping*
> > scratched cds. Note that it's when using *userspace* access to the block
> > device, with e.g. cdparanoia or grip (or dvd ripping tools).
> 
> What does your system time usage look like?

IIRC (don't have a scratched cd at hand) nearly 100% system time (nearly
50% in fact cause it's a dual-proc)

	Xav

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Mike Fedyk]

On Thu, May 02, 2002 at 10:49:50AM +0200, Xavier Bestel wrote:
> Le jeu 02/05/2002 ? 10:26, Stephen Samuel a ?crit :
> > I ran a similar type of test on a 2.4.9.31 (redhat 7.1 ) kernel.
> > With the CD on HDD, I could read off of HDA just peachy while
> > the system was choking on a scratched (aol) cd.
> 
> The "system grinding to a halt" happens to me too, when *ripping*
> scratched cds. Note that it's when using *userspace* access to the block
> device, with e.g. cdparanoia or grip (or dvd ripping tools).
> 
> My DVD drive is on a VT82C693A/694x (ABit VP6).

Ahh, that's a good distinction to make.  I'll be testing CD ripping on this
machine eventually too.

Are you burning CDs at the same time as ripping?  If so, try doing that in a
two step process and see where the problem occours.

Can you post the full output of lspci?  Be sure to mention what drives are
on which controller (if you have two or more).

Can you post the kernel output from dmesg when it detects your drives?

Do you have any ISA devices in this system?

Can you post the commands it takes to reproduce the condition?

Also, `vmstat 1` output while the system is unresponsive would be good too.

Thanks,

Mike

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Xavier Bestel]

Le jeu 02/05/2002 à 17:48, Mike Fedyk a écrit :
> > The "system grinding to a halt" happens to me too, when *ripping*
> > scratched cds. Note that it's when using *userspace* access to the block
> > device, with e.g. cdparanoia or grip (or dvd ripping tools).
> > 
> > My DVD drive is on a VT82C693A/694x (ABit VP6).
> 
> Ahh, that's a good distinction to make.  I'll be testing CD ripping on this
> machine eventually too.
> 
> Are you burning CDs at the same time as ripping?  If so, try doing that in a
> two step process and see where the problem occours.

Well, I tried once and lost the CDR ...

> Can you post the full output of lspci?  Be sure to mention what drives are
> on which controller (if you have two or more).
> 
> Can you post the kernel output from dmesg when it detects your drives?
> 
> Do you have any ISA devices in this system?

A sound card and the legacy motherboard devices.

> Can you post the commands it takes to reproduce the condition?

Well, I use Grip (a gtk+ ripping proggy) in cdparanoia mode. Basically
it's like cdparanoia + gui.

> Also, `vmstat 1` output while the system is unresponsive would be good too.

I'll post that when I'll do it again with a scratched CD. For now I need
my machine to be responsive.

Cheers,
	Xav
 


00:00.0 Host bridge: VIA Technologies, Inc. VT82C693A/694x [Apollo PRO133x] (rev c4)
	Subsystem: ABIT Computer Corp.: Unknown device a204
	Flags: bus master, medium devsel, latency 8
	Memory at d0000000 (32-bit, prefetchable) [size=64M]
	Capabilities: [a0] AGP version 2.0
	Capabilities: [c0] Power Management version 2

00:01.0 PCI bridge: VIA Technologies, Inc. VT82C598/694x [Apollo MVP3/Pro133x AGP] (prog-if 00 [Normal decode])
	Flags: bus master, 66Mhz, medium devsel, latency 0
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
	I/O behind bridge: 00009000-00009fff
	Memory behind bridge: dd000000-deffffff
	Prefetchable memory behind bridge: d4000000-d7ffffff
	Capabilities: [80] Power Management version 2

00:07.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev 40)
	Subsystem: ABIT Computer Corp.: Unknown device 0000
	Flags: bus master, stepping, medium devsel, latency 0
	Capabilities: [c0] Power Management version 2

00:07.1 IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 06) (prog-if 8a [Master SecP PriP])
	Subsystem: VIA Technologies, Inc. Bus Master IDE
	Flags: bus master, medium devsel, latency 32
	I/O ports at a000 [size=16]
	Capabilities: [c0] Power Management version 2

00:07.2 USB Controller: VIA Technologies, Inc. UHCI USB (rev 16) (prog-if 00 [UHCI])
	Subsystem: Unknown device 0925:1234
	Flags: bus master, medium devsel, latency 32, IRQ 11
	I/O ports at a400 [size=32]
	Capabilities: [80] Power Management version 2

00:07.3 USB Controller: VIA Technologies, Inc. UHCI USB (rev 16) (prog-if 00 [UHCI])
	Subsystem: Unknown device 0925:1234
	Flags: bus master, medium devsel, latency 32, IRQ 11
	I/O ports at a800 [size=32]
	Capabilities: [80] Power Management version 2

00:07.4 Bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 40)
	Flags: medium devsel, IRQ 11
	Capabilities: [68] Power Management version 2

00:09.0 FireWire (IEEE 1394): Texas Instruments: Unknown device 8020 (prog-if 10 [OHCI])
	Subsystem: Ads Technologies Inc: Unknown device 0000
	Flags: bus master, medium devsel, latency 32, IRQ 9
	Memory at df004000 (32-bit, non-prefetchable) [size=2K]
	Memory at df000000 (32-bit, non-prefetchable) [size=16K]
	Capabilities: [44] Power Management version 1

00:0a.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139 (rev 10)
	Subsystem: Realtek Semiconductor Co., Ltd. RT8139
	Flags: bus master, medium devsel, latency 32, IRQ 10
	I/O ports at ac00 [size=256]
	Memory at df005000 (32-bit, non-prefetchable) [size=256]
	Expansion ROM at <unassigned> [disabled] [size=64K]

00:0b.0 VGA compatible controller: S3 Inc. ViRGE/DX or /GX (rev 01) (prog-if 00 [VGA])
	Subsystem: S3 Inc. ViRGE/DX
	Flags: medium devsel, IRQ 10
	Memory at d8000000 (32-bit, non-prefetchable) [size=64M]
	Expansion ROM at <unassigned> [disabled] [size=64K]

00:0c.0 Multimedia audio controller: Ensoniq ES1371 [AudioPCI-97] (rev 09)
	Subsystem: Ensoniq Creative Sound Blaster AudioPCI64V, AudioPCI128
	Flags: bus master, slow devsel, latency 32, IRQ 11
	I/O ports at b000 [size=64]
	Capabilities: [dc] Power Management version 2

00:0e.0 Unknown mass storage controller: Triones Technologies, Inc. HPT366 / HPT370 (rev 03)
	Subsystem: Triones Technologies, Inc.: Unknown device 0001
	Flags: bus master, 66Mhz, medium devsel, latency 120, IRQ 11
	I/O ports at b400 [size=8]
	I/O ports at b800 [size=4]
	I/O ports at bc00 [size=8]
	I/O ports at c000 [size=4]
	I/O ports at c400 [size=256]
	Expansion ROM at <unassigned> [disabled] [size=128K]
	Capabilities: [60] Power Management version 2

01:00.0 VGA compatible controller: ATI Technologies Inc Rage 128 PF (prog-if 00 [VGA])
	Subsystem: ATI Technologies Inc: Unknown device 0028
	Flags: bus master, stepping, 66Mhz, medium devsel, latency 32, IRQ 9
	Memory at d4000000 (32-bit, prefetchable) [size=64M]
	I/O ports at 9000 [size=256]
	Memory at de000000 (32-bit, non-prefetchable) [size=16K]
	Expansion ROM at <unassigned> [disabled] [size=128K]
	Capabilities: [50] AGP version 2.0
	Capabilities: [5c] Power Management version 2




Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
VP_IDE: IDE controller on PCI bus 00 dev 39
VP_IDE: chipset revision 6
VP_IDE: not 100% native mode: will probe irqs later
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
VP_IDE: VIA vt82c686b (rev 40) IDE UDMA100 controller on pci00:07.1
    ide0: BM-DMA at 0xa000-0xa007, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0xa008-0xa00f, BIOS settings: hdc:DMA, hdd:DMA
HPT370: IDE controller on PCI bus 00 dev 70
HPT370: chipset revision 3
HPT370: not 100% native mode: will probe irqs later
HPT370: using 33MHz PCI clock
    ide2: BM-DMA at 0xc400-0xc407, BIOS settings: hde:DMA, hdf:pio
    ide3: BM-DMA at 0xc408-0xc40f, BIOS settings: hdg:pio, hdh:pio
hdb: C/H/S=0/0/0 from BIOS ignored
hda: WDC WD400BB-32BSA0, ATA DISK drive
hdb: IOMEGA ZIP 100 ATAPI, ATAPI FLOPPY drive
hdc: HITACHI DVD-ROM GD-7500, ATAPI CD/DVD-ROM drive
hdd: LG CD-RW CED-8080B, ATAPI CD/DVD-ROM drive
hde: ST340824A, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
ide2 at 0xb400-0xb407,0xb802 on irq 11
hda: 78165360 sectors (40021 MB) w/2048KiB Cache, CHS=38166/64/32, UDMA(100)
hde: 78165360 sectors (40021 MB) w/2048KiB Cache, CHS=77545/16/63, UDMA(100)
Partition check:
 hda: [PTBL] [5169/240/63] hda1 < hda5 hda6 hda7 >
 hdb:<3>ide-scsi: hdb: unsupported command in request queue (0)
end_request: I/O error, dev 03:40 (hdb), sector 0
ide-scsi: hdb: unsupported command in request queue (0)
end_request: I/O error, dev 03:40 (hdb), sector 2
ide-scsi: hdb: unsupported command in request queue (0)
end_request: I/O error, dev 03:40 (hdb), sector 4
ide-scsi: hdb: unsupported command in request queue (0)
end_request: I/O error, dev 03:40 (hdb), sector 6
ide-scsi: hdb: unsupported command in request queue (0)
end_request: I/O error, dev 03:40 (hdb), sector 0
ide-scsi: hdb: unsupported command in request queue (0)
end_request: I/O error, dev 03:40 (hdb), sector 2
ide-scsi: hdb: unsupported command in request queue (0)
end_request: I/O error, dev 03:40 (hdb), sector 4
ide-scsi: hdb: unsupported command in request queue (0)
end_request: I/O error, dev 03:40 (hdb), sector 6
 unable to read partition table
 hde: hde1 hde2

[ That's Ok, it's the Zip drive ]

SCSI subsystem driver Revision: 1.00
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
  Vendor: IOMEGA    Model: ZIP 100           Rev: 23.D
  Type:   Direct-Access                      ANSI SCSI revision: 00
  Vendor: HITACHI   Model: DVD-ROM GD-7500   Rev: 0005
  Type:   CD-ROM                             ANSI SCSI revision: 02
  Vendor: LG        Model: CD-RW CED-8080B   Rev: 1.06
  Type:   CD-ROM                             ANSI SCSI revision: 02
Attached scsi removable disk sda at scsi0, channel 0, id 0, lun 0
sda : READ CAPACITY failed.
sda : status = 0, message = 00, host = 0, driver = 28 
Current sd00:00: sense key Not Ready
Additional sense indicates Medium not present
sda : block size assumed to be 512 bytes, disk size 1GB.  
 sda: I/O error: dev 08:00, sector 0
 I/O error: dev 08:00, sector 0
 unable to read partition table
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 1, lun 0
Attached scsi CD-ROM sr1 at scsi0, channel 0, id 2, lun 0
sr0: scsi3-mmc drive: 14x/40x cd/rw xa/form2 cdda tray
Uniform CD-ROM driver Revision: 3.12
sr1: scsi3-mmc drive: 32x/32x writer cd/rw xa/form2 cdda tray

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Mike Fedyk]

On Thu, May 02, 2002 at 01:26:46AM -0700, Stephen Samuel wrote:
> I ran a similar type of test on a 2.4.9.31 (redhat 7.1 ) kernel.
> With the CD on HDD, I could read off of HDA just peachy while
> the system was choking on a scratched (aol) cd.
> 
> I did a WC of a 300MB file (only 256MB of ram on the system,
> so that's guaranteed to not fit in any cache).
> 
> Times to read the file were statistically equivalent whether
> the system was choking on the CD or not.

Great, can you post the lspci output for your IDE chipset(s)?

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Stephen Samuel]

00:00.0 Host bridge: Intel Corporation 440BX/ZX - 82443BX/ZX Host bridge (rev 03)
00:01.0 PCI bridge: Intel Corporation 440BX/ZX - 82443BX/ZX AGP bridge (rev 03)
00:04.0 ISA bridge: Intel Corporation 82371AB PIIX4 ISA (rev 02)
00:04.1 IDE interface: Intel Corporation 82371AB PIIX4 IDE (rev 01)
00:04.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01)
00:04.3 Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 02)

Mike Fedyk wrote:
> On Thu, May 02, 2002 at 01:26:46AM -0700, Stephen Samuel wrote:
> 
>>I ran a similar type of test on a 2.4.9.31 (redhat 7.1 ) kernel.
>>With the CD on HDD, I could read off of HDA just peachy while
>>the system was choking on a scratched (aol) cd.
>>
>>I did a WC of a 300MB file (only 256MB of ram on the system,
>>so that's guaranteed to not fit in any cache).
>>
>>Times to read the file were statistically equivalent whether
>>the system was choking on the CD or not.
> 
> 
> Great, can you post the lspci output for your IDE chipset(s)?


-- 
Stephen Samuel +1(604)876-0426                samuel@bcgreen.com
		   http://www.bcgreen.com/~samuel/
Powerful committed communication, reaching through fear, uncertainty and
doubt to touch the jewel within each person and bring it to life.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Stephen Samuel]

> I don't think it has to do with the IRQs, but it sounds like the entire ide
> chipset (think two cables one one chipset...) has stopped responding when
> ONE device (out of a possible four (with two cables)) has failed media.

In my case, I was able to read data from hda while the cdrom
on hdd was trying to recover data from a scratched disk.
Reading data from hdc (shared cable with the CDROM), on the
other hand, was VERY slow.

I have an 82371AB PIIX4 ide interface (dual IDE chipset),
It's part of a 440BX chipset board.

If accessing on one IDE interface (C/D) causes the other (A/B) to lockup,
I'd guess you've got especially cheap hardware on your box.

-- 
Stephen Samuel +1(604)876-0426                samuel@bcgreen.com
		   http://www.bcgreen.com/~samuel/
Powerful committed communication, reaching through fear, uncertainty and
doubt to touch the jewel within each person and bring it to life.

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Zwane Mwaikambo]

On Wed, 24 Apr 2002, Bill Davidsen wrote:
> > Put your CDs on a different controller and you can do anything you
> > want without affecting other tasks.
> 
>   As above, another type of bus is not cost effective, another IDE cable
> doesn't solve the problem, no matter what theory says. 

Hmm, i have my cdrw on a different IDE controller in an all IDE system and 
never experience "hangs" even for completely borked cds. The disks are on 
the onboard IDE controller. This is also true for when burning CDs, i can 
thrash the harddisks with no noticeable slowdown.

	Zwane
-- 
http://function.linuxpower.ca
		

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Erik Andersen]

On Thu Apr 18, 2002 at 03:13:35PM +0200, Dr. Death wrote:
> Problem:
> 
> I use SuSE Linux 7.2 and when I create md5sums from damaged files on a 
> CD, the WHOLE system  freezes or is ugly slow untill md5 has passed the 
> damaged part of the file !

This should help somewhat.  Currently, ide-cd.c retries ERROR_MAX
(8) times when it sees an error.  But ide.c is also retrying
ERROR_MAX times when _it_ sees an error, and does a bus reset
after evey 4 failures.  So for each bad sector, you get 64
retries (with typical timouts of 7 seconds each) plus 16 bus
resets per bad sector.

The funny thing is though, we knew after the first read that we
had an uncorrectable medium error.  Try this patch vs 2.4.19-pre7

--- linux/drivers/ide/ide-cd.c.orig	Tue Apr  9 06:59:56 2002
+++ linux/drivers/ide/ide-cd.c	Tue Apr  9 07:04:59 2002
@@ -657,6 +657,11 @@
 			   request or data protect error.*/
 			ide_dump_status (drive, "command error", stat);
 			cdrom_end_request (0, drive);
+		} else if (sense_key == MEDIUM_ERROR) {
+			/* No point in re-trying a zillion times on a bad 
+			 * sector...  If we got here the error is not correctable */
+			ide_dump_status (drive, "media error (bad sector)", stat);
+			cdrom_end_request (0, drive);
 		} else if ((err & ~ABRT_ERR) != 0) {
 			/* Go to the default handler
 			   for other errors. */
 -Erik

--
Erik B. Andersen             http://codepoet-consulting.com/
--This message was written using 73% post-consumer electrons--

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Denis Vlasenko]

On 19 April 2002 18:01, Erik Andersen wrote:
> On Thu Apr 18, 2002 at 03:13:35PM +0200, Dr. Death wrote:
> > Problem:
> >
> > I use SuSE Linux 7.2 and when I create md5sums from damaged files on a
> > CD, the WHOLE system  freezes or is ugly slow untill md5 has passed the
> > damaged part of the file !
>
> This should help somewhat.  Currently, ide-cd.c retries ERROR_MAX
> (8) times when it sees an error.  But ide.c is also retrying
> ERROR_MAX times when _it_ sees an error, and does a bus reset
> after evey 4 failures.  So for each bad sector, you get 64
> retries (with typical timouts of 7 seconds each) plus 16 bus
> resets per bad sector.

And nobody knows how many tries is in hardware...
so we get 8x8x?? retries, and *this* is slow.
--
vda

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Hans-Peter Jansen]

On Fri, 19 Apr 2002 14:01:13 -0600
"Erik Andersen" <andersen@codepoet.org> wrote:

> This should help somewhat.  Currently, ide-cd.c retries ERROR_MAX
> (8) times when it sees an error.  But ide.c is also retrying
> ERROR_MAX times when _it_ sees an error, and does a bus reset
> after evey 4 failures.  So for each bad sector, you get 64
> retries (with typical timouts of 7 seconds each) plus 16 bus
> resets per bad sector.

Thanks for investigation. BTW: Does this cover the ide-scsi case, too?
 
> The funny thing is though, we knew after the first read that we
> had an uncorrectable medium error.  Try this patch vs 2.4.19-pre7
> 
> --- linux/drivers/ide/ide-cd.c.orig	Tue Apr  9 06:59:56 2002
> +++ linux/drivers/ide/ide-cd.c	Tue Apr  9 07:04:59 2002
> @@ -657,6 +657,11 @@
>  			   request or data protect error.*/
>  			ide_dump_status (drive, "command error", stat);
>  			cdrom_end_request (0, drive);
> +		} else if (sense_key == MEDIUM_ERROR) {
> +			/* No point in re-trying a zillion times on a bad 
> +			 * sector...  If we got here the error is not correctable */
> +			ide_dump_status (drive, "media error (bad sector)", stat);

.. and some curious will want to know which sector has thrown the error 
[which would save me to patch this some day myself...]

> +			cdrom_end_request (0, drive);
>  		} else if ((err & ~ABRT_ERR) != 0) {
>  			/* Go to the default handler
>  			   for other errors. */
>  -Erik
> 
> --
> Erik B. Andersen             http://codepoet-consulting.com/
> --This message was written using 73% post-consumer electrons--

Cheers,
  Hans-Peter

Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Andre Hedrick]

You have addressed the core problem I have been working on quietly.
The export of the sense data and end request per subdriver is required to
make the personalities proper.  This is messy for two of the four current
subdrivers, and teh fifth new one will be clean from the start.

Cheers,

Andre Hedrick
LAD Storage Consulting Group

On Mon, 22 Apr 2002, Hans-Peter Jansen wrote:

> On Fri, 19 Apr 2002 14:01:13 -0600
> "Erik Andersen" <andersen@codepoet.org> wrote:
> 
> > This should help somewhat.  Currently, ide-cd.c retries ERROR_MAX
> > (8) times when it sees an error.  But ide.c is also retrying
> > ERROR_MAX times when _it_ sees an error, and does a bus reset
> > after evey 4 failures.  So for each bad sector, you get 64
> > retries (with typical timouts of 7 seconds each) plus 16 bus
> > resets per bad sector.
> 
> Thanks for investigation. BTW: Does this cover the ide-scsi case, too?
>  
> > The funny thing is though, we knew after the first read that we
> > had an uncorrectable medium error.  Try this patch vs 2.4.19-pre7
> > 
> > --- linux/drivers/ide/ide-cd.c.orig	Tue Apr  9 06:59:56 2002
> > +++ linux/drivers/ide/ide-cd.c	Tue Apr  9 07:04:59 2002
> > @@ -657,6 +657,11 @@
> >  			   request or data protect error.*/
> >  			ide_dump_status (drive, "command error", stat);
> >  			cdrom_end_request (0, drive);
> > +		} else if (sense_key == MEDIUM_ERROR) {
> > +			/* No point in re-trying a zillion times on a bad 
> > +			 * sector...  If we got here the error is not correctable */
> > +			ide_dump_status (drive, "media error (bad sector)", stat);
> 
> .. and some curious will want to know which sector has thrown the error 
> [which would save me to patch this some day myself...]
> 
> > +			cdrom_end_request (0, drive);
> >  		} else if ((err & ~ABRT_ERR) != 0) {
> >  			/* Go to the default handler
> >  			   for other errors. */
> >  -Erik
> > 
> > --
> > Erik B. Andersen             http://codepoet-consulting.com/
> > --This message was written using 73% post-consumer electrons--
> 
> Cheers,
>   Hans-Peter
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files

[Roger Larsson]

Hi,

Byt why does it look up the whole system during these retries?
Does it busy wait? (on timer or HW status)

In that case the preemtive kernel could help too... (assuming that it
does not busy wait under a lock - but it is not unlikely...)

/RogerL

On Friday 19 April 2002 22.01, Erik Andersen wrote:
> On Thu Apr 18, 2002 at 03:13:35PM +0200, Dr. Death wrote:
> > Problem:
> > 
> > I use SuSE Linux 7.2 and when I create md5sums from damaged files on a 
> > CD, the WHOLE system  freezes or is ugly slow untill md5 has passed the 
> > damaged part of the file !
> 
> This should help somewhat.  Currently, ide-cd.c retries ERROR_MAX
> (8) times when it sees an error.  But ide.c is also retrying
> ERROR_MAX times when _it_ sees an error, and does a bus reset
> after evey 4 failures.  So for each bad sector, you get 64
> retries (with typical timouts of 7 seconds each) plus 16 bus
> resets per bad sector.
> 
> The funny thing is though, we knew after the first read that we
> had an uncorrectable medium error.  Try this patch vs 2.4.19-pre7
> 
> --- linux/drivers/ide/ide-cd.c.orig	Tue Apr  9 06:59:56 2002
> +++ linux/drivers/ide/ide-cd.c	Tue Apr  9 07:04:59 2002
> @@ -657,6 +657,11 @@
>  			   request or data protect error.*/
>  			ide_dump_status (drive, "command error", stat);
>  			cdrom_end_request (0, drive);
> +		} else if (sense_key == MEDIUM_ERROR) {
> +			/* No point in re-trying a zillion times on a bad 
> +			 * sector...  If we got here the error is not correctable */
> +			ide_dump_status (drive, "media error (bad sector)", stat);
> +			cdrom_end_request (0, drive);
>  		} else if ((err & ~ABRT_ERR) != 0) {
>  			/* Go to the default handler
>  			   for other errors. */
>  -Erik
> 
> --
> Erik B. Andersen             http://codepoet-consulting.com/
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> 

-- 
Roger Larsson
Skellefteå
Sweden