Having now experimented with this, I found that I have exactly
the same problem with 2.4.31, even running dvbdate from the
command line would crash the box.
The eventual fix was to take CONFIG_DEBUG_KERNEL out of
my .config (it was left in there from when I was playing
with the file-system API).
The CONFIG_DEBUG_KERNEL option appears to scribble over
free'd memory with 0x5a5a5a5a to detect uninitialised data,
and the crashes I was seeing was from where the kernel
tried to use this as a pointer:
Unable to handle kernel paging request at virtual address 5a5a5a5a
*pde = 00000000
CPU: 0
EIP: 0010:[<c011616c>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010086
eax: f795bdb8 ebx: 5a5a5a5a ecx: 00000001 edx: 00000003
esi: f795bdac edi: f795bdb8 ebp: c03bfef8 esp: c03bfee0
ds: 0018 es: 0018 ss: 0018
Process swapper (pid: 0, stackpage=c03bf000)
Stack: 00000001 00000286 00000003 f78f9340 f795bdac f78f9380 f78f9248 f8960a1f
f792b000 f7847dec f73a618c f7847dec f78f9580 00000000 00000000 03ffd403
f7872300 00000000 f792b000 00000006 f8966014 f8961d75 f792b000 00000001
Call Trace: [<f8960a1f>] [<f8961d75>] [<c01089a5>] [<c0108b54>] [<c01052e0]
[<c010afd8>] [<c01052e0>] [<c0105303>] [<c0105372>] [<c0105000>]
Code: 8b 13 0f 0f 02 39 c3 74 3c 8b 4b fc 8b 01 85 45 f0 74 25 31
I don't know if the problem is in the dvb drivers or in
something else that it depends on (eg. usb), but I would be curious
to know if anyone else gets the same problem if they turn on
CONFIG_DEBUG_KERNEL.
Regards,
Bernard
Bernard Hatt wrote:
> I've been running 2.4.27 with linuxtv-dvb-1.1.1 and
> linuxtv-dvb-apps-1.1.0 for some time with no problems whatsoever.
>
> Having now upgraded to 2.4.30 (re-compiling the linux-dvb modules)
> using dvb seems to cause the machine to lock up (completly frozen
> with just the caps lock and scroll lock flashing on the keyboard).
>
> xine will start up and display the first channel, but will lock the
> machine if I change channel, and dvbdate will also cause this.
>
> The hardware is a DEC-2000:
> P: Vendor=0b48 ProdID=1006 Rev= 1.00
> S: Manufacturer=TechnoTrend AG
> S: Product=TechnoTrend DVB-S/-C/-T STB - USB Adapter
> I: If#= 0 Alt= 0 #EPs= 8 Cls=00(>ifc ) Sub=00 Prot=00 Driver=ttusb-dec
>
> Everything is stable again once I reboot with 2.4.27 ...
>
> Have I missed something obvious in upgrading the kernel ?, is
> anyone else running with 2.4.30 ?
>
> Thanks,
>
> Bernard
>
> _______________________________________________
>
> linux-dvb@xxxxxxxxxxx
> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
>
