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

[Paul Menzel]

Dear Christophe,


On 26.03.19 13:55, Christophe Leroy wrote:

> Le 26/03/2019 Ã 13:49, Paul Menzel a ÃcritÂ:

> > 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
> > > [ÂÂÂ 4.407957] kmemleak: Kernel memory leak detector initialized
> > > [ÂÂÂ 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?

It seems to have worked with Linux 4.18-rc4+ [1].

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

No, sorry, I have not. I do not have resources for this.


Kind regards,

Paul


[1]: https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-July/175658.html