ltmdm panic

hi all,

the Lucent Technology winmodem, (ltmdm from the ports/comms),
 included in the Dell Inspiron 8000
panic when a ring incoming signal occurs.

The 6.0-current kernel is  dated from this afternoon, but
I have seen that 20 days ago.

here is the ddb screen:

SSkernel trap 12 with interrupts disabled
page fault while in kernel mode
fault virtual address 0x138
fault cod"e supervisor read = page not present
instruction pointer 0x8:0xc1b8d00d
stack pointer 0x10:0xcbedfc84
frame pointer = 0x10:0xcbedfc94
code segment base 0x0 limit 0xfffff, type 0x1b
	= dpl 0 pres 1 def32 1, gran 1

processor eflags = resume IOPL=0
current process = 18 (swi5 ttyltmdm++)
thread 100000]
stopped at siointr 1+0xbd instruction: cmpl $0,0x138(%edx)

Any idea would be welcome.
Thanks

raoul
raoul.megelas_at_libertysurf.fr