Running 'wodim blank=fast' on a previously written DVD-RW causes the kernel to go into an (apparently infinite) loop starting and stopping the DVD. $ wodim blank=fast wodim: Operation not permitted. Warning: Cannot raise RLIMIT_MEMLOCK limits. Device was not specified. Trying to find an appropriate drive... Detected CD-R drive: /dev/sr0 Device type : Removable CD-ROM Version : 5 Response Format: 2 Capabilities : Vendor_info : 'ASUS ' Identification : 'DRW-2014L1T ' Revision : '1.02' Device seems to be: Generic mmc2 DVD-R/DVD-RW. Using generic SCSI-3/mmc DVD-R(W) driver (mmc_mdvd). Driver flags : SWABAUDIO BURNFREE Supported modes: PACKET SAO Speed set to 5540 KB/s Starting to write CD/DVD at speed 4.0 in real BLANK mode for single session. Last chance to quit, starting real write in 0 seconds. Operation starts. wodim: OPC failed. The process is in D state, and 'kill -9' does not stop it. Judging by the sound, the DVD motor is spinning up and spinning down every 3 seconds of so. There is an ATA error message in /var/log/messages: Nov 20 17:01:46 i kernel: [169029.856091] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen Nov 20 17:01:46 i kernel: [169029.856104] sr 1:0:0:0: [sr0] CDB: Send OPC info: 54 01 00 00 00 00 00 00 00 00 Nov 20 17:01:46 i kernel: [169029.856134] ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0 Nov 20 17:01:46 i kernel: [169029.856138] res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout) Nov 20 17:01:46 i kernel: [169029.856148] ata2.00: status: { DRDY } Nov 20 17:01:46 i kernel: [169029.856161] ata2: hard resetting link Nov 20 17:01:46 i kernel: [169030.316074] ata2: softreset failed (device not ready) Nov 20 17:01:46 i kernel: [169030.316085] ata2: applying SB600 PMP SRST workaround and retrying Nov 20 17:01:47 i kernel: [169030.471077] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300) Nov 20 17:01:47 i kernel: [169030.471726] ata2.00: configured for UDMA/66 Nov 20 17:01:47 i kernel: [169030.471942] ata2: EH complete ~ Kernel 2.6.35.6-48.fc14.x86_64, wodim-1.1.11-1.fc14.x86_64
The process managed to exit about 20 minutes after being sent the signal, which would correspond to several hundred retries of the operation. Locking up the DVD-writer for that long isn't sensible; if the operation hasn't succeeded after the first couple, it probably never will.
Does this still happen on 2.6.35.9?
Yes, this still happens with 2.6.35.9-64.fc14.x86_64. It only happens with one particular disk (presumably damaged in some way).
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