CD recording with cdrecord/dvdrecord hangs system completely

[Yury Tarasievich]

Hello,

Webform for some reason doesn't accept safety code, so I'm sending PR 
via e-mail:

System is SMP 2xPIII-500 with 512M RAM. Disks are SCSI 4x9G on ahc0: 
<Adaptec aic7896/97 Ultra2 SCSI adapter>, recorder is IDE Teac CD-W524E.

uname -a is
FreeBSD nova.in.grsu.by 4.10-RELEASE FreeBSD 4.10-RELEASE #0: Sat Jun 19 
18:07:20 EEST 2004     root at nova.in.grsu.by:/usr/src/sys/compile/SMP-8  i386

When recording fairly massive amount of data on CD-recorder, after about 
30 to 100 Megs recorded all system activity stops. Consoles can be 
switched but do not otherwise respond to keystrokes (no ctrl-alt-del 
too), network exchange stops. Console #0 sometimes shows lots of 
messages about swap pages, something like them not being where expected 
(?) (you see, each time this happened, I had to hard-reset ASAP and 
assist autofsck-ing with lots of errors, not copying to paper, sorry no 
help from me here.)

Surely happened with 4.9 and 4.10 RELEASEs. Surely did NOT happen with 
4.6.2 and 4.7 RELEASEs. Can't remember whether it happened with 
4.8-RELEASE or started only in 4.9.

Config of kernel is always the same, adding SMP, IPX, 
IPFW2/DUMMY/BRIDGE, device atapicam and HZ=1000, and excluding some 
unneeded devices.

I just noticed it first in 4.9 (4.8?), and it's still there in 4.10. In 
4.9, it happened each time when trying to record ~>50 meg track. There 
seemed to be some improvement in 4.10, two ~100 meg tracks recorded 
okay, then wham. Small amounts of data pas okay, but I don't know 
whether problem cause is cumulative or not.

For recording, I used cdrtools 1.11a37, 2.0.0.3 and dvdrtools 0.1.5.

regards,
Yury.