I've successfully burned several iso images (backups of DVDs) to blank dual layer discs using K3b, but the last one I tried to burn got stuck at 4076MB. I tried it a couple of times with different iso images and now it fails at 4076MB (presumably where the layer switches) every time.

Screenshot:

Error output.
Devices
-----------------------
Optiarc DVD RW AD-7201S 1.06 (/dev/sr0, CD-R, CD-RW, CD-ROM, DVD-ROM, DVD-R, DVD-RW, DVD-R DL, DVD+R, DVD+RW, DVD+R DL) [DVD-ROM, DVD-R Sequential, DVD-R Dual Layer Sequential, DVD-R Dual Layer Jump, DVD-RAM, DVD-RW Restricted Overwrite, DVD-RW Sequential, DVD+RW, DVD+R, DVD+R Dual Layer, CD-ROM, CD-R, CD-RW] [SAO, TAO, RAW, SAO/R96P, SAO/R96R, RAW/R16, RAW/R96P, RAW/R96R, Restricted Overwrite, Layer Jump] [%7]

System
-----------------------
K3b Version: 2.0.2
KDE Version: 4.8.2 (4.8.2)
QT Version: 4.8.1
Kernel: 3.0.0-19-generic

Used versions
-----------------------
cdrecord: 1.1.11

cdrecord
-----------------------
scsidev: '/dev/sr0'
devname: '/dev/sr0'
scsibus: -2 target: -2 lun: -2
Linux sg driver version: 3.5.27
Wodim version: 1.1.11
SCSI buffer size: 64512
Beginning DMA speed test. Set CDR_NODMATEST environment variable if device
communication breaks or freezes immediately after that.
TOC Type: 1 = CD-ROM
Driveropts: 'burnfree'
Device type : Removable CD-ROM
Version : 5
Response Format: 2
Capabilities :
Vendor_info : 'Optiarc '
Identification : 'DVD RW AD-7201S '
Revision : '1.06'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Current: 0x002B (DVD+R/DL)
Profile: 0x002B (DVD+R/DL) (current)
Profile: 0x001B (DVD+R)
Profile: 0x001A (DVD+RW)
Profile: 0x0016 (DVD-R/DL layer jump recording)
Profile: 0x0015 (DVD-R/DL sequential recording)
Profile: 0x0014 (DVD-RW sequential recording)
Profile: 0x0013 (DVD-RW restricted overwrite)
Profile: 0x0012 (DVD-RAM)
Profile: 0x0011 (DVD-R sequential recording)
Profile: 0x0010 (DVD-ROM)
Profile: 0x000A (CD-RW)
Profile: 0x0009 (CD-R)
Profile: 0x0008 (CD-ROM)
Profile: 0x0002 (Removable disk)
Using generic SCSI-3/mmc DVD-R(W) driver (mmc_mdvd).
Driver flags : SWABAUDIO BURNFREE
Supported modes: PACKET SAO
Drive buf size : 1310720 = 1280 KB
FIFO size : 12582912 = 12288 KB
Speed set to 11080 KB/s
Track 01: data 6137 MB
Total size: 7049 MB (698:21.48) = 3142611 sectors
Lout start: 7049 MB (698:23/36) = 3142611 sectors
Current Secsize: 2048
HINT: use dvd+rw-mediainfo from dvd+rw-tools for information extraction.
Blocks total: 4173824 Blocks current: 4173824 Blocks remaining: 1031213
Starting to write CD/DVD at speed 8.0 in real SAO mode for single session.
Last chance to quit, starting real write in 2 seconds.
1 seconds.
0 seconds. Operation starts.
dvd_dual_layer_split: read_dvd_structure returns invalid data
Preparing middle zone location for this DVD+R dual layer disc
Waiting for reader process to fill input buffer ... input buffer ready.
Performing OPC...
Sending CUE sheet...
Starting new track at sector: 0
Track 01: 0 of 6137 MB written.
Track 01: 1 of 6137 MB written (fifo 98%) [buf 62%] 0.5x.

[... etc. etc. ...]

Track 01: 4076 of 6137 MB written (fifo 100%) [buf 38%] 4.6x.
/usr/bin/wodim: faio_wait_on_buffer for writer timed out.
Errno: 5 (Input/output error), write_g1 scsi sendcmd: no error
CDB: 2A 00 00 1F D9 7C 00 00 1F 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 72 0B 00 00 00 00 00 0E 09 0C 00 00 00 02 00 00
Sense Key: 0x0 No Additional Sense, Segment 11
Sense Code: 0x00 Qual 0x02 (end-of-partition/medium detected) Fru 0x0
Sense flags: Blk 0 (not valid)
cmd finished after 271.408s timeout 200s
/usr/bin/wodim: A write error occured.
/usr/bin/wodim: Please properly read the error message above.
Errno: 5 (Input/output error), prevent/allow medium removal scsi sendcmd: fatal error
CDB: 1E 00 00 00 00 00
cmd finished after 0.000s timeout 200s
Track 01: data 6137 MB
Total size: 7049 MB (698:21.48) = 3142611 sectors
Lout start: 7049 MB (698:23/36) = 3142611 sectors
Current Secsize: 2048
HINT: use dvd+rw-mediainfo from dvd+rw-tools for information extraction.
Blocks total: 4173824 Blocks current: 4173824 Blocks remaining: 1031213
Errno: 5 (Input/output error), test unit ready scsi sendcmd: fatal error
CDB: 00 00 00 00 00 00
cmd finished after 0.000s timeout 200s
write track data: error after 4274774016 bytes
Writing time: 810.544s
Average write speed 5.8x.
Min drive buffer fill was 38%
Fixating...
Errno: 5 (Input/output error), flush cache scsi sendcmd: fatal error
CDB: 35 00 00 00 00 00 00 00 00 00
cmd finished after 0.000s timeout 200s
/usr/bin/wodim: Cannot fixate disk.
Trouble flushing the cache
Fixating time: 0.000s
Errno: 5 (Input/output error), prevent/allow medium removal scsi sendcmd: fatal error
CDB: 1E 00 00 00 00 00
cmd finished after 0.000s timeout 200s
/usr/bin/wodim: fifo had 67523 puts and 67333 gets.
/usr/bin/wodim: fifo was 0 times empty and 24218 times full, min fill was 80%.

cdrecord command:
-----------------------
/usr/bin/wodim -v gracetime=2 dev=/dev/sr0 speed=8 -sao driveropts=burnfree -data -tsize=3142611s -


Devices
-----------------------
Optiarc DVD RW AD-7201S 1.06 (/dev/sr0, CD-R, CD-RW, CD-ROM, DVD-ROM, DVD-R, DVD-RW, DVD-R DL, DVD+R, DVD+RW, DVD+R DL) [DVD-ROM, DVD-R Sequential, DVD-R Dual Layer Sequential, DVD-R Dual Layer Jump, DVD-RAM, DVD-RW Restricted Overwrite, DVD-RW Sequential, DVD+RW, DVD+R, DVD+R Dual Layer, CD-ROM, CD-R, CD-RW] [SAO, TAO, RAW, SAO/R96P, SAO/R96R, RAW/R16, RAW/R96P, RAW/R96R, Restricted Overwrite, Layer Jump] [%7]

System
-----------------------
K3b Version: 2.0.2
KDE Version: 4.8.2 (4.8.2)
QT Version: 4.8.1
Kernel: 3.0.0-19-generic

Used versions
-----------------------
cdrecord: 1.1.11

cdrecord
-----------------------
scsidev: '/dev/sr0'
devname: '/dev/sr0'
scsibus: -2 target: -2 lun: -2
Linux sg driver version: 3.5.27
Wodim version: 1.1.11
SCSI buffer size: 64512
Beginning DMA speed test. Set CDR_NODMATEST environment variable if device
communication breaks or freezes immediately after that.
TOC Type: 1 = CD-ROM
Driveropts: 'burnfree'
Device type : Removable CD-ROM
Version : 5
Response Format: 2
Capabilities :
Vendor_info : 'Optiarc '
Identification : 'DVD RW AD-7201S '
Revision : '1.06'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Current: 0x002B (DVD+R/DL)
Profile: 0x002B (DVD+R/DL) (current)
Profile: 0x001B (DVD+R)
Profile: 0x001A (DVD+RW)
Profile: 0x0016 (DVD-R/DL layer jump recording)
Profile: 0x0015 (DVD-R/DL sequential recording)
Profile: 0x0014 (DVD-RW sequential recording)
Profile: 0x0013 (DVD-RW restricted overwrite)
Profile: 0x0012 (DVD-RAM)
Profile: 0x0011 (DVD-R sequential recording)
Profile: 0x0010 (DVD-ROM)
Profile: 0x000A (CD-RW)
Profile: 0x0009 (CD-R)
Profile: 0x0008 (CD-ROM)
Profile: 0x0002 (Removable disk)
Using generic SCSI-3/mmc DVD-R(W) driver (mmc_mdvd).
Driver flags : SWABAUDIO BURNFREE
Supported modes: PACKET SAO
Drive buf size : 1310720 = 1280 KB
FIFO size : 12582912 = 12288 KB
Speed set to 11080 KB/s
Track 01: data 6137 MB
Total size: 7049 MB (698:21.48) = 3142611 sectors
Lout start: 7049 MB (698:23/36) = 3142611 sectors
Current Secsize: 2048
HINT: use dvd+rw-mediainfo from dvd+rw-tools for information extraction.
Blocks total: 4173824 Blocks current: 4173824 Blocks remaining: 1031213
Starting to write CD/DVD at speed 8.0 in real SAO mode for single session.
Last chance to quit, starting real write in 2 seconds.
1 seconds.
0 seconds. Operation starts.
dvd_dual_layer_split: read_dvd_structure returns invalid data
Preparing middle zone location for this DVD+R dual layer disc
Waiting for reader process to fill input buffer ... input buffer ready.
Performing OPC...
Sending CUE sheet...
Starting new track at sector: 0
Track 01: 0 of 6137 MB written.
Track 01: 1 of 6137 MB written (fifo 98%) [buf 62%] 0.5x.

[... etc. etc. ...]

Track 01: 4076 of 6137 MB written (fifo 100%) [buf 38%] 4.6x.
/usr/bin/wodim: faio_wait_on_buffer for writer timed out.
Errno: 5 (Input/output error), write_g1 scsi sendcmd: no error
CDB: 2A 00 00 1F D9 7C 00 00 1F 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 72 0B 00 00 00 00 00 0E 09 0C 00 00 00 02 00 00
Sense Key: 0x0 No Additional Sense, Segment 11
Sense Code: 0x00 Qual 0x02 (end-of-partition/medium detected) Fru 0x0
Sense flags: Blk 0 (not valid)
cmd finished after 271.408s timeout 200s
/usr/bin/wodim: A write error occured.
/usr/bin/wodim: Please properly read the error message above.
Errno: 5 (Input/output error), prevent/allow medium removal scsi sendcmd: fatal error
CDB: 1E 00 00 00 00 00
cmd finished after 0.000s timeout 200s
Track 01: data 6137 MB
Total size: 7049 MB (698:21.48) = 3142611 sectors
Lout start: 7049 MB (698:23/36) = 3142611 sectors
Current Secsize: 2048
HINT: use dvd+rw-mediainfo from dvd+rw-tools for information extraction.
Blocks total: 4173824 Blocks current: 4173824 Blocks remaining: 1031213
Errno: 5 (Input/output error), test unit ready scsi sendcmd: fatal error
CDB: 00 00 00 00 00 00
cmd finished after 0.000s timeout 200s
write track data: error after 4274774016 bytes
Writing time: 810.544s
Average write speed 5.8x.
Min drive buffer fill was 38%
Fixating...
Errno: 5 (Input/output error), flush cache scsi sendcmd: fatal error
CDB: 35 00 00 00 00 00 00 00 00 00
cmd finished after 0.000s timeout 200s
/usr/bin/wodim: Cannot fixate disk.
Trouble flushing the cache
Fixating time: 0.000s
Errno: 5 (Input/output error), prevent/allow medium removal scsi sendcmd: fatal error
CDB: 1E 00 00 00 00 00
cmd finished after 0.000s timeout 200s
/usr/bin/wodim: fifo had 67523 puts and 67333 gets.
/usr/bin/wodim: fifo was 0 times empty and 24218 times full, min fill was 80%.

cdrecord command:
-----------------------
/usr/bin/wodim -v gracetime=2 dev=/dev/sr0 speed=8 -sao driveropts=burnfree -data -tsize=3142611s -

I don't think I can delete my post, so I'll just confess instead. I didn't check the box 'Verify disk', which seems to make the difference.

Please report this as a bug, Verify disc should not affect the ability to burn dual-layer discs.

bcooksley wrote:Please report this as a bug, Verify disc should not affect the ability to burn dual-layer discs.

Have done so, thanks.

https://bugs.kde.org/show_bug.cgi?id=299391