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This bug has been copied from bug #1283116 and has been proposed
to be backported to 7.2 z-stream (EUS).

Fix included in qemu-kvm-1.5.3-105.el7_2.2

Reproduced bug with qemu-img-1.5.3-105.el7.x86_64 & qemu-kvm-1.5.3-105.el7.x86_64

1.# truncate -s 1G test_sparse
2.# echo "a" >> test_sparse
3.# qemu-img map test_sparse
Offset          Length          Mapped to       File
qemu-img: qemu-img.c:1988: get_block_status: Assertion `nb_sectors' failed.
Aborted (core dumped)


verified bug with qemu-img-1.5.3-105.el7_2.2.x86_64

# truncate -s 1G test_sparse
# echo "a" >> test_sparse
# qemu-img map test_sparse
Offset          Length          Mapped to       File
0x40000000      0x200           0x40000000      test_sparse

According to this result.  This bug is fixed.

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://rhn.redhat.com/errata/RHSA-2016-0083.html