linux-kernel - Re: AMD uncore kmemleak

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Message-ID: <80ef6f5d-52b4-38ee-d161-27743211f902@amd.com>
Date:   Wed, 9 Nov 2022 16:33:59 +0530
From:   Ravi Bangoria <ravi.bangoria@....com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Sandipan Das <sandipan.das@....com>
Subject: Re: AMD uncore kmemleak

Hi Boris,

On 09-Nov-22 4:22 PM, Borislav Petkov wrote:
> Hey,
> 
> Peter said you liked this stuff so here it is. :-)
> 
> On one of my test boxes (Carrizo laptop - that's an Excavator core) I
> see the below. It happens with 6.1-rc1.
> 
> I booted latest -rc4 + tip/master and it is gone so something has
> changed in the meantime or this particular version doesn't fire...
> 
> Anyway, we thought you should know in case you want to dig deeper.
> 
> Thx.
> 
> cat /sys/kernel/debug/kmemleak
> unreferenced object 0xffff888101a3d3a0 (size 32):
>   comm "swapper/0", pid 1, jiffies 4294892455 (age 294.968s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<000000002f5fe849>] __kmalloc_node+0x5f/0x180
>     [<00000000066a1fb1>] amd_uncore_cpu_up_prepare+0xc7/0x240
>     [<000000005fa7fab5>] cpuhp_invoke_callback+0xf8/0x460
>     [<00000000d4b0952e>] cpuhp_issue_call+0x118/0x190
>     [<000000008cb1592a>] __cpuhp_setup_state_cpuslocked+0xee/0x2a0
>     [<0000000007534fa6>] __cpuhp_setup_state+0x76/0x100
>     [<00000000d8277f50>] amd_uncore_init+0x275/0x336
>     [<000000004af336cd>] do_one_initcall+0x44/0x200
>     [<0000000040cb5caf>] kernel_init_freeable+0x198/0x1e4
>     [<000000008b0e9fae>] kernel_init+0x16/0x120
>     [<00000000459bcaeb>] ret_from_fork+0x22/0x30
> unreferenced object 0xffff888101a3d240 (size 32):

I guess this should fix it:
https://lore.kernel.org/all/4fa9e5ac6d6e41fa889101e7af7e6ba372cfea52.1662613255.git.sandipan.das@amd.com

Thanks,
Ravi