[Qemu-block] block/nfs: qemu-iotests 077 failing

[Kevin Wolf]

Hi Peter,

while testing the blockdev-add for NFS series, I noticed that apart from
a few obvious false positives, qemu-iotests case 077 fails in a
concerning way:

--- /home/kwolf/source/qemu/tests/qemu-iotests/077.out  2016-09-14 
11:23:41.143593271 +0200
+++ 077.out.bad 2016-10-31 16:27:17.644705503 +0100
@@ -82,6 +82,7 @@
 XXX bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
 == Verify image content ==
+Pattern verification failed at offset 0, 512 bytes
 read 512/512 bytes at offset 0
 512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 read 512/512 bytes at offset 512
Failures: 077

Is this failure known? If not, maybe someone should look into it as it
appears to be data corruption at the first sight. (However, I don't want
to completely rule out that blkdebug just behaves differently with NFS.)

Kevin