I verified the test instructions, working as outlined:
root@node-horsea:/home/ubuntu# qemu-system-x86_64 -cdrom
./CentOS-7-x86_64-Minimal-1511.iso -m 1024 -blockdev
'{"driver":"file","filename":"/mnt/reproducer-centos.img","node-name":"disk0","cache":{"direct":true}}'
-device virtio-blk-pci,drive=disk0 -vnc 0.0.0.0:0 -enable-kvm
qemu-system-x86_64: warning: host doesn't support requested feature:
CPUID.80000001H:ECX.svm [bit 2]
qemu-system-x86_64: /build/qemu-RSjBPs/qemu-5.0/block/io.c:1887:
bdrv_co_write_req_prepare: Assertion `end_sector <= bs->total_sectors ||
child->perm & BLK_PERM_RESIZE' failed.
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https://bugs.launchpad.net/bugs/1921665
Title:
QEMU hits assertion when virtual disk is stored on NFS server and is
not 4 kib byte aligned
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