Hello,

On Wed, Nov 09, 2011 at 05:51:59PM +0100, Stanislaw Gruszka wrote:

I just discovered that CONFIG_DEBUG_PAGEALLOC does not work as expected.
It leave most of free pages unprotected, hence unintentional write to
them is not discovered. I'm attaching additional patch, which should
make detection actually work.

If kernel will does not boot with corrupt_dbg=1, you may try to catch
corruption without that option. Attached patch should make it possible,
however having corrupt_dbg=1 increase probability of the catch.

Okay, I applied this additional patch, and by the increased memory usage (as
shown by free) I concluded that it indeed works. However, I was still able to
reproduce the issue without a single error being written to dmesg. :-(

I will try some really old kernels as Wey suggested to see whether it makes
any sense to bisect it, but if it does, it might take more time than I can
make free. Perhaps it would be cheaper to just get another card in that case.
:-)

Kind regards,
-- 
Tomáš Janoušek, a.k.a. Liskni_si, http://work.lisk.in/