linux-kernel - 5.4-rc1 boot regression with kmemleak enabled

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Date:   Tue, 5 Nov 2019 09:14:06 +0200
From:   Amir Goldstein <amir73il@...il.com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Theodore Tso <tytso@....edu>, fstests <fstests@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>, Qian Cai <cai@....pw>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: 5.4-rc1 boot regression with kmemleak enabled

Hi Catalin,

My kvm-xfstests [1] VM doesn't boot with kmemleak enabled since commit
c5665868183f ("mm: kmemleak: use the memory pool for early allocations").

There is no console output when running:

$ kvm -boot order=c -net none -machine type=pc,accel=kvm:tcg -cpu host \
    -drive file=$ROOTFS,if=virtio,snapshot=on -vga none -nographic \
    -smp 2 -m 2048 -serial mon:stdio --kernel $KERNEL \
    --append 'root=/dev/vda console=ttyS0,115200'

$ kvm --version
QEMU emulator version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.19)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

Attached defconfig saved by 'make savedefconfig'.

I tried increasing DEBUG_KMEMLEAK_MEM_POOL_SIZE, which did not help.
I also tried moving kmemleak_init() back to its old location, since this
changes seemed unrelated to the commit. Didn't help either.

Let me know if you have any suggestion how to debug this.

Thanks,
Amir.

[1] https://github.com/tytso/xfstests-bld/blob/master/Documentation/kvm-xfstests.md

Download attachment "defconfig" of type "application/octet-stream" (7580 bytes)