kernel hangs during boot

Just tried to boot a new kernel on my laptop since the ACPI code was
modular and OHCI was finally fixed, and instead of booting it hangs
right after (or during?) the ATA probe:

ata0-master: pio=0x0c wdma=0x22 udma=0x45 cable=80pin
ata0-master: setting PIO4 on AcerLabs Aladdin chip
ata0-master: setting UDMA66 on AcerLabs Aladdin chip
GEOM: create disk ad0 dp=0xc427ab60
ad0: <TOSHIBA MK3017GAP/A0.10 H> ATA-5 disk at ata0-master
ad0: 28615MB (58605120 sectors), 58140 C, 16 H, 63 S, 512 B
ad0: 16 secs/int, 1 depth queue, UDMA66
(probe0:ata0:0:0:0): error 22
(probe0:ata0:0:0:0): Unretryable Error
(probe1:ata0:0:1:0): error 22
(probe1:ata0:0:1:0): Unretryable Error
ata1-master: pio=0x0c wdma=0x22 udma=0x42 cable=40pin
ata1-master: setting PIO4 on AcerLabs Aladdin chip
acd0: <UJDA720 DVD/CDRW/1.00> CDRW drive at ata1 as master
acd0: read 4134KB/s (4134KB/s) write 1377KB/s (1377KB/s), 2048KB buffer, PIO4
acd0: Reads: CDR, CDRW, CDDA stream, DVDROM, DVDR, DVDRAM, packet
acd0: Writes: CDR, CDRW, test write, burnproof
acd0: Audio: play, 256 volume levels
acd0: Mechanism: ejectable tray, unlocked
acd0: Medium: 120mm data disc
(probe1:ata1:0:1:0): error 22
(probe1:ata1:0:1:0): Unretryable Error
(probe2:ata0:0:0:0): error 22
(probe2:ata0:0:0:0): Unretryable Error
(probe3:ata0:0:1:0): error 22
(probe3:ata0:0:1:0): Unretryable Error
(probe1:ata1:0:1:0): error 22
(probe1:ata1:0:1:0): Unretryable Error
(probe0:ata1:0:0:0): Retrying Command
(probe0:ata1:0:0:0): error 22
(probe0:ata1:0:0:0): Unretryable Error
(probe0:ata1:0:0:0): Retrying Command
(probe0:ata1:0:0:0): error 22
(probe0:ata1:0:0:0): Unretryable Error
pass0 at ata1 bus 0 target 0 lun 0
pass0: <MATSHITA UJDA720 DVD/CDRW 1.00> Removable CD-ROM SCSI-0 device
pass0: 16.000MB/s transfers
GEOM: create disk cd0 dp=0xc4271600
cd0 at ata1 bus 0 target 0 lun 0
cd0: <MATSHITA UJDA720 DVD/CDRW 1.00> Removable CD-ROM SCSI-0 device
cd0: 16.000MB/s transfers
cd0: cd present [2156415 x 2048 byte records]
acpi_cmbat1: battery initialization failed, giving up
panic: from debugger
Stack backtrace:


ACPI as a module doesn't seem to be the culprit, nor does atapicam or even
atapicd. Pulling out the dvd drive still hangs. My working kernel is from
Nov 18, so I'm at a loss to exactly when this problem showed up.


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