linux-kernel - Re: kmemleak detects leak in msr_build

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Date:   Wed, 12 Jan 2022 00:16:17 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: kmemleak detects leak in msr_build_context

On Tue, Jan 11, 2022 at 10:05:43PM +0100, Paul Menzel wrote:
> [    0.672475] smpboot: CPU0: AMD A6-6400K APU with Radeon(tm) HD Graphics (family: 0x15, model: 0x13, stepping: 0x1)

I have a similar box to yours:

[    0.382127] smpboot: CPU0: AMD PRO A12-8800B R7, 12 Compute Cores 4C+8G (family: 0x15, model: 0x60, stepping: 0x1)

...

[    0.974044] x86/pm: family 0x15 cpu detected, MSR saving is needed during suspending.

well, Bulldozer-based at least, and booting with kmemleak enabled is fine:

$ cat /sys/kernel/debug/kmemleak 
$

I wonder whether you have something else applied and forgotten along
with all those random printks I'm seeing in dmesg...

Also,

unreferenced object 0xffff8914823de500 (size 64):
					^^^^^^^^

That's strange too - sizeof(struct saved_msr) is 40 and not 64 so that
looks weird...

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette