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

hermann pitton hermann-pitton at arcor.de
Wed Oct 17 04:43:12 CEST 2007


Am Mittwoch, den 17.10.2007, 02:34 +0200 schrieb Oliver Endriss:
> Soeren Sonnenburg wrote:
> > On Sun, 2007-10-14 at 19:47 +0200, Oliver Endriss wrote:
> > > 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.
> > 
> > Well it could be a bug in the asus p7131 firmware and the card just
> > randomly doing weird things... and if this can be seen only after a few
> > days of vdr/continuous use not many people may be affected and you may
> > just not get reports.
> > 
> > > > , but I get 
> > > > 
> > > > - gcc compile failures
> > > > - filesystem corruptions
> > > > - database corruptions
> > > 
> > > Hm. Very often these symptoms are caused by broken hardware.
> > 
> > I know. But as this machine has uptimes of months without this card
> > (even with several pci slots in use and worked for long long times with
> > very different cards in these slots) and it does not work when I just
> > use the card instead of a win-tv or so I am sure that it is the the asus
> > card which is not working correctly.
> > 
> > Anyway I am now replacing that card with a tt-1500-t lets see whether
> > strange things will happen or not.
> > 
> > > > 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. ;-)
> > 
> > Well :-) If the tt-1500 turns out to work OK I can just once give the
> > asus + your isolated patch a last chance before trashing it...
> 
> Wait! Please clarify whether you think that your problem is caused by
> the _saa7134_ driver or the _saa7146_ driver.
> 
> You wrote 'that <memory corruption> is caused by the saa7146 driver,'
> Is this a typo? Did you mean saa7134?
> 
> (My patch is pointless if you do not run a saa7146-based card.)

As I understand he has both.

Single work each, but not together and in that case always the saa713x
is the culprit.

Hermann






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