Florian Weimer <fwei...@redhat.com> added the comment:

offsets = ( 4096, 12288, 20480, 28672, 36864, 45056, 53248, 61440, 69632,
        77824,)

These offsets are less than 64 KiB apart.  On systems with a 64 KiB page size, 
this will not result in a sparse file on tmpfs because the effective block size 
is the page size (tmpfs lives in the page cache).

Red Hat Enterprise Linux uses 64 KiB pages on aarch64, ppc64, ppc64le.  Only 
s390x and x86_64 use 4 KiB pages.

----------
nosy: +fweimer

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