Package: linux-image-5.6.0-2-s390x Source: linux Version: 5.6.14-1 5.5 worked correctly: # qemu-system-s390x -M s390-ccw-virtio -cpu max -m 512 -kernel vmlinuz-5.5.0-0.bpo.2-s390x -display none -serial mon:stdio qemu-system-s390x: warning: 'msa5-base' requires 'kimd-sha-512'. qemu-system-s390x: warning: 'msa5-base' requires 'klmd-sha-512'. KASLR disabled: CPU has no PRNG [ 1.617782] Linux version 5.5.0-0.bpo.2-s390x (debian-kernel@lists.debian.org) (gcc version 8.3.0 (Debian 8.3.0-6)) #1 SMP Debian 5.5.17-1~bpo10+1 (2020-04-23) [ 1.618669] setup: Linux is running under KVM in 64-bit mode [ 1.619472] setup: The maximum memory size is 512MB [ 1.620515] cpu: 1 configured CPUs, 0 standby CPUs [...] But 5.6 appears to stop immediately: # qemu-system-s390x -M s390-ccw-virtio -cpu max -m 512 -kernel vmlinuz-5.6.0-2-s390x -display none -serial mon:stdio qemu-system-s390x: warning: 'msa5-base' requires 'kimd-sha-512'. qemu-system-s390x: warning: 'msa5-base' requires 'klmd-sha-512'. KASLR disabled: CPU has no PRNG # echo $? 0
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