asterisk users - Nov 2003 - E100P driver overwrites memory used bye linux-kernel

Hi,

we have a Digium E100P in use with asterisk and the driver of the E100P
overwrites important memory locations of the kernel. The side-effects
are malloc-errors when simple shell commands are used, unable to compile
anything (internal compiler errors), files that are edited are in the
state as before editing. The memory is ok, tested this with memtest86
and no problems occur if the driver is not loaded.

System:
- CPU: Athlon XP 2600+
- RAM: 1 GB DDR400 RAM
- BRD: EPOX 8KRA2i KT600

Kernel 2.4.21
(4GB) High Memory Support
[*] HIGHMEM I/O support
[*] MTRR (Memory Type Range Register) support
[*] Local APIC support on uniprocessors
[*] IO-APIC support on uniprocessors

can the highmem i/o support be the cause of the problems?
Has anyone had this problem, too?

cu,

Steffen Koepf

Hi,

i did some tests. If the kernel modules are loaded

Module                  Size  Used by    Not tainted
wct1xxp                11488  31
zaptel                176256  64  [wct1xxp]
ppp_generic            19068   0  [zaptel]
slhc                    5392   0  [ppp_generic]

and the E1 is connected to the PBX, everything is ok.

Then i started asterisk, it opens the D-Channel and
everything is still ok. I left the system in this state
and it survived one night without problems. But immediately
after the first call (B-Channel) the system memory is overwritten
and bad things happen. 
I looked through the wct1xxp.c and it looks like the D-Channel
(HDLC) is handled between hardware and driver like the B-Channels
(no HDLC decoding in hardware), right?
That would mean that it is probably software problem. Is there a 
way to do some test calls without asterisk?

cu,

Steffen