Re: 5.4-rc1 boot regression with kmemleak enabled

[Qian Cai]

> On Nov 5, 2019, at 2:14 AM, Amir Goldstein <amir73il@xxxxxxxxx> wrote:
> 
> 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.

It probably use a bit more memory than before. Does lower the parameter help? Eventually, It should boot with POOL_SIZE=0, no?