[linux-dvb] random memory corruptions with asus p7131 (Re: asus p7131 vs ZDF?)

Oliver Endriss o.endriss at gmx.de
Sun Oct 14 19:47:23 CEST 2007

Soeren Sonnenburg wrote:
> On Fri, 2007-10-12 at 02:24 +0200, Oliver Endriss wrote:
> > Soeren Sonnenburg wrote:
> > > I am unfortunately 100% sure that it is caused by the saa7146 driver, as
> > > I have an uptime of over a week now that it is not loaded (but the card
> > > is still in the slot, yeah and I did memory tests for 18 passes -
> > > nothing).
> > 
> > Could you please try the patch posted in
> > http://linuxtv.org/pipermail/linux-dvb/2007-October/021042.html
> > 
> > and report whether it fixes your problem?
> Hmmhh, reading what it changes
> "Two fixes for the 'saa7146_wait_for_debi_done' code:
> (a) Timeout did not work when the routine was called with interrupts
>     disabled.
> (b) Reduce PCI I/O load caused by saa7146_wait_for_debi_done.
>     Seems to be very important on fast machines!"
> I am not sure why this could fix the problems I am seeing. I can give it
> a try if you are quite confident that it could help

High load on the PCI bus might trigger a bug somewhere else.
Btw, I'm not aware of any reports that the saa7146 driver caused memory
corruption or something like that.

> , but I get 
> - gcc compile failures
> - filesystem corruptions
> - database corruptions

Hm. Very often these symptoms are caused by broken hardware.

> when the card's driver is loaded and is in use for a few days (and then
> finally a hang/crash+reboot). I have the *feeling* that the situation
> improved slightly by improving reception via F-connectors, so I thing
> there is some kind of buffer overflow or so occurring...
> Anyway thanks for your work, I will happily try it if you think it may
> fix this problem.

I would try. ;-)


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