The problem seems to start here:
18:52:24 cthulhu kernel: devkit-disks-da[6011]: segfault at c ip
080660da sp bfb85410 error 4 in devkit-disks-daemon[8048000+28000]
It looks like the modem was reset after the crash, falling back to
storage mode and being switched again. This happens several times in
your log.
Did you update your kernel as well? There is a firmware bug in some
Huawei models which was exposed by kernel 2.6.31.2; IIRC a workaround
was implemented with 2.6.31.5.
It causes the modem to reset as soon as the storage (card reader or
pseudo CD-ROM present *after* switching) is accessed.
The CD access problem you report points definitely into that direction.
Unfortunately, there is nothing that can be done from usb_modeswitch's
side.
Josua Dietze
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