On 08/11/2011 07:56 PM, Carlos Eduardo de Brito Novaes wrote:
> Hello again,
>
> I did what you said, changed the open/close to non real time, removed every
> portion of code that is not related with the fault (the read_rt is still
> there
> since is where the problem arrises and also another ioctl to start timer
> since
> the open/close are moved out of real time context). There is also the wait
> ioctl to show that the code works when wait is done inside ioctl.
> The problem persists, but no hangs perceived. Just the application returns
> too
> fast and there is the kernel message on NULL pointer derreference, so I also
> tried to recompile with another kernel version, the vanilla 2.6.38-8 from
> kernel.org and the adeos patch (on the previous tests I was using the same
> with additional ubuntu patches). Even now the app returns imediately after
> call read with rtdm_event_wait and there is the same kernel log.
> I dont think there is any memory corruption due to the module code since
> there
> is no dynamic allocations, little pointer operations mainly related to the
> context hadler witch is allocated by xenomai on rtdm_dev_register.
> I send you the new tarball.
>
> Thanks for your support.
The copy_to_user is still overflowing. And in fact, it is probably the
cause of the bug you observe, I had not read your example carefully.
--
Gilles.
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