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Created attachment 926690 [details]
qemu-iotests-results-for-qcow2.txt

BTW, Test the raw and vhdx format can pass.

- qemu-iotests for raw:
Not run: 006 007 013 014 015 017 018 019 020 022 023 024 026 027 028 029 030 031 034 035 037 038 040 041 042 043 044 049 054 060 067 068 069 073 074 079 080 081 083 084 085 086 088 092 095
Passed all 17 tests

- qemu-iotests for vhdx:
Not run: 006 007 013 014 015 016 017 018 019 020 022 023 024 025 026 027 028 029 030 031 034 035 037 038 040 041 042 043 044 048 049 054 060 067 068 069 073 074 079 080 081 083 084 085 086 088 092 095
Passed all 14 tests

The problem is in the test case, not the code. As it happens, I get a different
set of (similarly false positive) failures. We may consider cleaning this up for
6.8, but it might just not be worth the effort in the end.