bug (isdn-subsystem?) in 2.4.0

bug (isdn-subsystem?) in 2.4.0

[Ronny Buchmann]

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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Re: bug (isdn-subsystem?) in 2.4.0

[Kai Germaschewski]

On Mon, 15 Jan 2001, Ronny Buchmann wrote:

> i have the following problem with kernel 2.4.0 (also with -ac6):
>
> kernel BUG at slab.c:1095!
> invalid operand: 0000
> CPU: 0

I could reproduce the problem, the appended patch fixes it here. Linus,
could you please apply this for 2.4.1?

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

A decoded oops would be nice the next time, see

	<your linux kernel source>/REPORTING-BUGS

However, you gave enough information for me to reproduce the problem, so
it's fine this time.

Thanks,
--Kai

--- linux-2.4.1-pre2/drivers/isdn/isdn_v110.c%	Sun Aug  6 21:43:42 2000
+++ linux-2.4.1-pre2/drivers/isdn/isdn_v110.c	Mon Jan 15 22:31:43 2001
@@ -102,7 +102,7 @@
 	int i;
 	isdn_v110_stream *v;

-	if ((v = kmalloc(sizeof(isdn_v110_stream), GFP_KERNEL)) == NULL)
+	if ((v = kmalloc(sizeof(isdn_v110_stream), GFP_ATOMIC)) == NULL)
 		return NULL;
 	memset(v, 0, sizeof(isdn_v110_stream));
 	v->key = key;
@@ -134,7 +134,7 @@
 	v->b = 0;
 	v->skbres = hdrlen;
 	v->maxsize = maxsize - hdrlen;
-	if ((v->encodebuf = kmalloc(maxsize, GFP_KERNEL)) == NULL) {
+	if ((v->encodebuf = kmalloc(maxsize, GFP_ATOMIC)) == NULL) {
 		kfree(v);
 		return NULL;
 	}


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Re: bug (isdn-subsystem?) in 2.4.0

[Ronny Buchmann]

Kai Germaschewski wrote:

> On Mon, 15 Jan 2001, Ronny Buchmann wrote:
> 
> 
>> i have the following problem with kernel 2.4.0 (also with -ac6):
>> 
>> kernel BUG at slab.c:1095!
>> invalid operand: 0000
>> CPU: 0
> 
> 
> I could reproduce the problem, the appended patch fixes it here. Linus,
> could you please apply this for 2.4.1?
but a part of the problem remains: i can't get a succesful connection

the calling side gets a CONNECT message, but on the called side i only 
get the RING
and after some seconds on both lines NO CARRIER

syslog only shows the RING and no connect

the same when i'm calling from gsm phone

btw, when calling from mobile phone i have to leave S19=197 (with 2.2.17 
S19=0 is working as described in the isdn faq, has this changed now?)

>> (if you need the other numbers or anything else, ask me, i can reproduce
>> it easily)
> 
> 
> A decoded oops would be nice the next time, see
> 
> 	<your linux kernel source>/REPORTING-BUGS
> 
sorry, my fault

tia
ronny

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