linux-kernel - Re: Change eats memory on my server

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Message-ID: <83f74a11-b3c0-db2e-8301-4292d60d803b@amd.com>
Date:   Mon, 18 Jan 2021 08:43:12 +0100
From:   Christian König <christian.koenig@....com>
To:     Eli Cohen <elic@...dia.com>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, daniel.vetter@...ll.ch,
        sam@...nborg.org, dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: Change eats memory on my server

Hi Eli,

have you already tried using kmemleak?

This sounds like a leak of memory allocated using kmalloc(), so kmemleak 
should be able to catch it.

Regards,
Christian.

Am 17.01.21 um 06:08 schrieb Eli Cohen:
> On Fri, Jan 15, 2021 at 10:03:50AM +0100, Thomas Zimmermann wrote:
>> Could you please double-check that 3fb91f56aea4 ("drm/udl: Retrieve USB
>> device from struct drm_device.dev") works correctly
> Checked again, it does not seem to leak.
>
>> and that 823efa922102
>> ("drm/cma-helper: Remove empty drm_gem_cma_prime_vunmap()") is broken?
>>
> Yes, this one leaks, as does the one preceding it:
>
> 1086db71a1db ("drm/vram-helper: Remove invariant parameters from internal kmap function")
>   
>> For one of the broken commits, could you please send us the output of
>>
>>    dmesg | grep -i drm
>>
>> after most of the memory got leaked?
>>
> I ran the following script in the shell:
>
> while true; do cat /proc/meminfo | grep MemFree:; sleep 5; done
>
> and this is what I saw before I got disconnected from the shell:
>
> MemFree:          148208 kB
> MemFree:          148304 kB
> MemFree:          146660 kB
> Connection to nps-server-24 closed by remote host.
> Connection to nps-server-24 closed.
>
>
> I also mointored the output of dmesg | grep -i drm
> The last output I was able to save on disk is this:
>
> [   46.140720] ast 0000:03:00.0: [drm] Using P2A bridge for configuration
> [   46.140737] ast 0000:03:00.0: [drm] AST 2500 detected
> [   46.140754] ast 0000:03:00.0: [drm] Analog VGA only
> [   46.140772] ast 0000:03:00.0: [drm] dram MCLK=800 Mhz type=7 bus_width=16
> [   46.153553] [drm] Initialized ast 0.1.0 20120228 for 0000:03:00.0 on minor 0
> [   46.165097] fbcon: astdrmfb (fb0) is primary device
> [   46.391381] ast 0000:03:00.0: [drm] fb0: astdrmfb frame buffer device
> [   56.097697] systemd[1]: Starting Load Kernel Module drm...
> [   56.343556] systemd[1]: modprobe@....service: Succeeded.
> [   56.350382] systemd[1]: Finished Load Kernel Module drm.
> [13319.469462] [   2683] 70889  2683    55586        0    73728      138             0 tdrm
> [13320.658386] [   2683] 70889  2683    55586        0    73728      138             0 tdrm
> [13321.800970] [   2683] 70889  2683    55586        0    73728      138             0 tdrm