linux-kernel - Re: [PATCH] KVM: arm64: Fix memory leaks from stage2 pagetable

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Message-ID: <20220531165710.GB25631@willie-the-truck>
Date:   Tue, 31 May 2022 17:57:11 +0100
From:   Will Deacon <will@...nel.org>
To:     Qian Cai <quic_qiancai@...cinc.com>
Cc:     Marc Zyngier <maz@...nel.org>, James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: arm64: Fix memory leaks from stage2 pagetable

On Thu, May 26, 2022 at 04:39:56PM -0400, Qian Cai wrote:
> Running some SR-IOV workloads could trigger some leak reports from
> kmemleak.
> 
> unreferenced object 0xffff080243cef500 (size 128):
>   comm "qemu-system-aar", pid 179935, jiffies 4298359506 (age 1629.732s)
>   hex dump (first 32 bytes):
>     28 00 00 00 01 00 00 00 00 e0 4c 52 03 08 ff ff  (.........LR....
>     e0 af a4 7f 7c d1 ff ff a8 3c b3 08 00 80 ff ff  ....|....<......
>   backtrace:
>      kmem_cache_alloc_trace
>      kvm_init_stage2_mmu

Hmm, I can't spot a 128-byte allocation in here so this is pretty cryptic.
I don't really like the idea of papering over the report; we'd be better off
trying to reproduce it.

Will