That happened when I tried to verify CD_R disks burned with
xcdroast (I have an ATAPI writer so I need to use ide-scsi
which also takes control over the ATAPI CD reader).
Hangs happned when I verified disks (mainly sequencial
read from the block device). Luckily not when burning disks.
I recompiled the kernel disabling SMP support and did not
see these hangs again. I believe the hangs are related
to (transient) read errors from the CD.
Itai
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