bug (isdn-subsystem?) in 2.4.0

From: Ronny Buchmann (rbla@gmx.de)
Date: Mon Jan 15 2001 - 13:51:09 EST


hi

i have the following problem with kernel 2.4.0 (also with -ac6):

when trying to connect two isdn channels (/dev/ttyI0 and /dev/ttyI1)
both initialized with "AT &E123 &L123 &R9600 S19=0 S0=1"
i get after "ATDT 123" (123 stands for my number)

kernel BUG at slab.c:1095!
invalid operand: 0000
CPU: 0
......

(if you need the other numbers or anything else, ask me, i can reproduce
it easily)

syslog shows (with isdnctrl verbose 3):
isdn_net: call from 0987123,7,0 -> 123
isdn_net: call from 0987123 -> 0 123, ignored
isdn_tty: call from 0987123, -> RING on ttyI1

than the crash

(987 stands for the area code)

my system:
redhat 7.0 (kernel compiled with gcc-2.96, egcs-1.1.2 and gcc-2.95.1
same result with each of them)
isdn-card: avm fritzcard pnp

btw, it is working with 2.2.17 and the avm driver on suse 6.4

tia
ronny

ps: im not on linux-kernel, so please cc to me

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