linux-kernel - Re: amdgpu crashes on OOM

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Date:   Mon, 26 Oct 2020 12:03:46 +0100
From:   Michel Dänzer <michel@...nzer.net>
To:     "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        alexander.deucher@....com, Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>, amd-gfx@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: amdgpu crashes on OOM

On 2020-10-26 5:29 a.m., Alex Xu (Hello71) wrote:
> Hi,
> 
> I frequently encounter OOM on my system, mostly due to my own fault.
> Recently, I noticed that not only does a swap storm happen and OOM
> killer gets invoked, but the graphics output freezes permanently.
> Checking the kernel messages, I see:
> 
> kworker/u24:4: page allocation failure: order:5, mode:0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null)
> CPU: 6 PID: 279469 Comm: kworker/u24:4 Tainted: G        W         5.9.0-14732-g20b1adb60cf6 #2
> Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./B450 Pro4, BIOS P4.20 06/18/2020
> Workqueue: events_unbound commit_work
> Call Trace:
>   ? dump_stack+0x57/0x6a
>   ? warn_alloc.cold+0x69/0xcd
>   ? __alloc_pages_direct_compact+0xfb/0x116
>   ? __alloc_pages_slowpath.constprop.0+0x9c2/0xc14
>   ? __alloc_pages_nodemask+0x143/0x167
>   ? kmalloc_order+0x24/0x64
>   ? dc_create_state+0x1a/0x4d
>   ? amdgpu_dm_atomic_commit_tail+0x1b19/0x227d

Looks like dc_create_state should use kvzalloc instead of kzalloc 
(dc_state_free already uses kvfree).

order:5 means it's trying to allocate 32 physically contiguous pages, 
which can be hard to fulfill even with lower memory pressure.


-- 
Earthling Michel Dänzer               |               https://redhat.com
Libre software enthusiast             |             Mesa and X developer