I am running a freshly installed Debian in VMware and I cannot get my RAID array assembled at boot (only if I use the option --write-journal). So the following is working without any issues:
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mdadm --create /dev/md/test --level=5 --raid-devices=3 /dev/sd[bcd]1
/usr/share/mdadm/mkconf > /etc/mdadm/mdadm.conf
update-initramfs -u -k all
reboot
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mdadm --create /dev/md/test --level=5 --raid-devices=3 --write-journal=/dev/sde1 /dev/sd[bcd]1
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mdadm --detail /dev/md/test
mdadm: cannot open /dev/md/test: No such file or directory
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mdadm --stop /dev/md127
mdadm --assemble --scan