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[ some more info cut+pasted ]

upstream has 8 MB for 2.8 and older, and 4 MB for 2.9 and newer machine types.

qemu-kvm traditionally has 16 MB (for rhel6 compatibility).  It should have followed upstream and use 4MB too for 2.9+ (aka rhel-7.4+) machine types (and keep the 16M for the older ones).

Didn't happen for some reason, thats why the assert() can still be triggered unless cirrus memory is explicitly set to 4 MB.

I don't feel like touching it this late in the RHEL-7.5 cycle.

I think we should take care to fix this when we add the next machine type to qemu-kvm, on the next rebase.  When I remember plans correctly (no more rebases in 7.x) this means for RHEL-8 ...

OK, we got a new 7.6 machine type, so we can fix this for 7.6.

Fix included in qemu-kvm-rhev-2.12.0-4.el7

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3443