Hi,

On Tue, Mar 29, 2011 at 12:50 PM, Catalin Marinas
[off-list ref] wrote:

On Tue, 2011-03-29 at 12:38 +0100, Maxin John wrote:

quoted

Hi,

quoted

You may want to disable the kmemleak testing to reduce the amount of
leaks reported.

The kmemleak results in MIPS that I have included in the previous mail
were obtained during the booting of the malta kernel.
Later, I have checked the "real" usage by using the default
"kmemleak_test" module.

Following output shows the kmemleak results when I used the "kmemleak_test.ko"

Yes, that's fine to test kmemleak and show that it reports issues on
MIPS. But it shouldn't report other leaks if the test module isn't
loaded at all (removing it wouldn't remove the leaks reported as they
are permanent).

Thank a lot for this information.  Based on this, I will check it
again in the MIPS platform.

quoted

debian-mips:~# cat /sys/kernel/debug/kmemleak
........

These were caused by the kmemleak test.

Oh.. I am sorry for creating confusion. I have added these lines (
........) just to show that I haven't shared the
complete output in order to reduce the length of the mail.

quoted

quoted

These are probably false positives.

The previous results could be false positives. However, the current
results are not false positives as we have intentionally created the
memory leaks using the test module.

I was only referring to those leaks coming from udp.c and ignored the
kmemleak tests (that's why I said that you should run it again without
the kmemleak_test.ko).

quoted

quoted

Since the pointer referring this
block (udp_table) is __read_mostly, is it possible that the
corresponding section gets placed outside the _sdata.._edata range?

I am not sure about this. Please  let know how can I check this.

Boot the kernel with kmemleak enabled but don't load kmemleak_test.ko.
Than you can either wait 10-15 minutes or force a scan with:

echo scan > /sys/kernel/debug/kmemleak
echo scan > /sys/kernel/debug/kmemleak
cat /sys/kernel/debug/kmemleak.

Thanks a lot for sharing the detailed steps.I will perform the test as
mentioned above and will share the results.

Thanks and Regards,
Maxin B. John