Re: 2.5.64-mm6: oops in elv_remove_request

Jeremy Fitzhardinge
2003-03-14T17:48:56Z

On Fri, 2003-03-14 at 03:37, Jens Axboe wrote:
> Can you send me the output of -prcap?

# cdrecord -prcap
Cdrecord 2.01a05 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg Schilling
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.7'
Device type : Removable CD-ROM
Version : 2
Response Format: 2
Capabilities :
Vendor_info : 'PLEXTOR '
Identifikation : 'CD-R PX-W4824A'
Revision : '1.04'
Device seems to be: Generic mmc CD-RW.

Drive capabilities, per MMC-3 page 2A:

Does read CD-R media
Does write CD-R media
Does read CD-RW media
Does write CD-RW media
Does not read DVD-ROM media
Does not read DVD-R media
Does not write DVD-R media
Does not read DVD-RAM media
Does not write DVD-RAM media
Does support test writing

Does read Mode 2 Form 1 blocks
Does read Mode 2 Form 2 blocks
Does read digital audio blocks
Does restart non-streamed digital audio reads accurately
Does support Buffer-Underrun-Free recording
Does read multi-session CDs
Does read fixed-packet CD media using Method 2
Does not read CD bar code
Does read R-W subcode information
Does return R-W subcode de-interleaved and error-corrected
Does read raw P-W subcode data from lead in
Does return CD media catalog number
Does return CD ISRC information
Does support C2 error pointers
Does deliver composite A/V data

Does play audio CDs
Number of volume control levels: 256
Does support individual volume control setting for each channel
Does support independent mute setting for each channel
Does not support digital output on port 1
Does not support digital output on port 2

Loading mechanism type: tray
Does support ejection of CD via START/STOP command
Does not lock media on power up via prevent jumper
Does allow media to be locked in the drive via PREVENT/ALLOW command
Is not currently in a media-locked state
Does not support changing side of disk
Does not have load-empty-slot-in-changer feature
Does not support Individual Disk Present feature

Maximum read speed: 7056 kB/s (CD 40x, DVD 5x)
Current read speed: 7056 kB/s (CD 40x, DVD 5x)
Maximum write speed: 8467 kB/s (CD 48x, DVD 6x)
Current write speed: 8467 kB/s (CD 48x, DVD 6x)
Rotational control selected: CLV/PCAV
Buffer size in KB: 4096
Copy management revision supported: 0
Number of supported write speeds: 8
Write speed # 0: 8467 kB/s CLV/PCAV (CD 48x, DVD 6x)
Write speed # 1: 7056 kB/s CLV/PCAV (CD 40x, DVD 5x)
Write speed # 2: 5645 kB/s CLV/PCAV (CD 32x, DVD 4x)
Write speed # 3: 4234 kB/s CLV/PCAV (CD 24x, DVD 3x)
Write speed # 4: 3528 kB/s CLV/PCAV (CD 20x, DVD 2x)
Write speed # 5: 2822 kB/s CLV/PCAV (CD 16x, DVD 2x)
Write speed # 6: 1411 kB/s CLV/PCAV (CD 8x, DVD 1x)
Write speed # 7: 706 kB/s CLV/PCAV (CD 4x, DVD 0x)

But... When I first ran -checkdrive this morning, it gave me good
results:

# cdrecord -checkdrive
Cdrecord 2.01a05 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg Schilling
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.7'
Device type : Removable CD-ROM
Version : 2
Response Format: 2
Capabilities :
Vendor_info : 'PLEXTOR '
Identifikation : 'CD-R PX-W4824A'
Revision : '1.04'
Device seems to be: Generic mmc CD-RW.
Using generic SCSI-3/mmc CD-R driver (mmc_cdr).
Driver flags : MMC-3 SWABAUDIO BURNFREE VARIREC
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R

But immediately afterwards:

# cdrecord -checkdrive
Cdrecord 2.01a05 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg Schilling
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.7'
Device type : Removable CD-ROM
Version : 0
Response Format: 1
Vendor_info : 'PLEXTOR '
Identifikation : 'CD-R PX-W4824A'
Revision : '1.04'
Device seems to be: Generic mmc CD-RW.
Using generic SCSI-3/mmc CD-R driver (mmc_cdr).
Driver flags : MMC-3 SWABAUDIO BURNFREE VARIREC
Supported modes:

Ejecting and reinserting the disc seems to restore things:

# cdrecord -checkdrive
Cdrecord 2.01a05 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg Schilling
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.7'
Device type : Removable CD-ROM
Version : 2
Response Format: 2
Capabilities :
Vendor_info : 'PLEXTOR '
Identifikation : 'CD-R PX-W4824A'
Revision : '1.04'
Device seems to be: Generic mmc CD-RW.
Using generic SCSI-3/mmc CD-R driver (mmc_cdr).
Driver flags : MMC-3 SWABAUDIO BURNFREE VARIREC
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R

Once:

# cdrecord -checkdrive
Cdrecord 2.01a05 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg Schilling
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.7'
Device type : Removable CD-ROM
Version : 0
Response Format: 1
Vendor_info : 'PLEXTOR '
Identifikation : 'CD-R PX-W4824A'
Revision : '1.04'
Device seems to be: Generic mmc CD-RW.
Using generic SCSI-3/mmc CD-R driver (mmc_cdr).
Driver flags : MMC-3 SWABAUDIO BURNFREE VARIREC
Supported modes:

Notice the "version" and "response format" fields have changed.

J