Bug#923524: installation-reports: buster on s390x qemu: ssh key generation hangs; repeated message "BUG: non-zero pgtables_bytes on freeing mm: -16384"
On 01.03.2019 12:26, Simon McVittie wrote:
> Package: installation-reports
> Severity: normal
>
> I tried to install Debian s390x on a qemu VM using command lines based on
> <https://wiki.qemu.org/Documentation/Platforms/S390X>.
>
> A stretch installation hasn't finished yet but appears to be heading for
> success, using this command-line:
>
> qemu-system-s390x \
> -machine s390-ccw-virtio \
> -cpu max,zpci=on \
> -m 4096 \
> -nic bridge,br=virbr0,model=virtio \
> --cdrom ~/incoming/debian-9.7.0-s390x-netinst.iso \
> -kernel ~/incoming/kernel.debian.stretch.s390x \
> -initrd ~/incoming/initrd.debian.stretch.s390x \
> -drive file=/home/smcv/tmp/virt/s390x.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=unsafe \
> -device virtio-blk-ccw,devno=fe.0.0001,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,scsi=off
>
> (*.debian.stretch.s390x are from
> <http://ftp.debian.org/debian/dists/stable/main/installer-s390x/current/images/generic/>,
> and virbr0 is the default bridge behind NAT created by libvirtd, with
> 192.168.122.x addresses.)
>
> However, an installation of the current buster netboot image with a
> similar command-line fails. The step that should generate a SSH host key
> hangs at 0% progress; perhaps this is related to insufficient entropy
> in the kernel?
>
> I also noticed repeated kernel messages "BUG: non-zero pgtables_bytes
> on freeing mm: -16384" which are probably a bad sign.
This is a known bug that sneaked in the 4.19 stable kernel. It was fixed around
4.19.13 (or 14?) and later. Fedora was also affected.
It is only a cosmetic issue and should not explain the hang though.
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