I have applied the fix to /etc/rc.d/rc.sysinit and also to /usr/sbin/modemtest.
The setserial utility is supposed to configure the modem so that it can be used. For example, it can be made to automatically select the correct IRQ line. I don't know what the story is with other than serial hardware modems, but anyway the above scripts are now limited to only running setserial for /dev/ttyS0 - ttyS4 devices.
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