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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