[Bug 46935] System hangs when using ltserial, ltmodem, /dev/ttyLTM0

[Johan Kiviniemi]

Public bug reported:

A laptop with

0000:02:02.0 Communication controller: Agere Systems WinModem 56k (rev
01)

hanged during an upgrade. It had to be forced to shut down with the
power button. When investigating the problem, i straced dpkg --configure
-a, and saw that the last actions before the hang are open(/dev/ttyLTM0)
and some ioctls with the fd during wvdial's postinst.

I blacklisted the ltserial module, and was able to finish the upgrade
without a problem.

The Ubuntu kernel versions installed to the computer: (the bug can be reproduced with both of them)
2.6.15-22-686
2.6.15-23-686

** Affects: linux-restricted-modules-2.6.15 (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed
** Affects: wvdial (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

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System hangs when using ltserial, ltmodem, /dev/ttyLTM0
https://launchpad.net/bugs/46935