linux-kernel - Re: Reading `/sys/kernel/debug/kmemleak` takes 3 s and content not shown

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Message-ID: <ad2278fd-ea56-d715-7efb-c4e0adb7314e@c-s.fr>
Date:   Tue, 26 Mar 2019 13:55:46 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Paul Menzel <pmenzel@...gen.mpg.de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: Reading `/sys/kernel/debug/kmemleak` takes 3 s and content not
 shown



Le 26/03/2019 à 13:49, Paul Menzel a écrit :
> Dear Linux folks,
> 
> 
> On 19.02.19 10:44, Paul Menzel wrote:
> 
>> On a the IBM S822LC (8335-GTA) with Ubuntu 18.10, and Linux 5.0-rc5+
>> accessing `/sys/kernel/debug/kmemleak` takes a long time. According to
>> strace it takes three seconds.
>>
>> $ dmesg | grep leak
>> [    4.407957] kmemleak: Kernel memory leak detector initialized
>> [    4.407959] kmemleak: Automatic memory scanning thread started
>> [745989.625624] kmemleak: 1 new suspected memory leaks (see 
>> /sys/kernel/debug/kmemleak)
>> [1002619.951902] kmemleak: 1 new suspected memory leaks (see 
>> /sys/kernel/debug/kmemleak)
>> ```
>>
>> Unfortunately, the leaks supposedly stored in that file are not shown
>> either.
> 
> The problem is still present with Linux 5.0. Do you have an idea, how to 
> fix this?
> 

Have you identified a previous version that works properly ?

If so, have you been able to bisect the problem ?

Christophe