linux-kernel - AMD uncore kmemleak

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Date:   Wed, 9 Nov 2022 11:52:20 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Ravi Bangoria <ravi.bangoria@....com>
Cc:     x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>
Subject: AMD uncore kmemleak

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):
  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 0xffff888101a3d4a0 (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

-- 
Regards/Gruss,
    Boris.

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