the recreate script demonstrates failure on xenial, artful and bionic in a VM.
xenial needs a change to mount-image-callback to run 'blockdev' on the nbd
device. i'm not actually sure how i've never seen that bug before.
with the change in place, all 3 can be made to show the issue. artful
and bionic vms are actually somewhat reliable, but if you run two copies
of the script concurrently it will fail.
=== modified file 'bin/mount-image-callback'
--- bin/mount-image-callback 2018-01-03 15:44:47 +0000
+++ bin/mount-image-callback 2018-01-04 17:19:37 +0000
@@ -316,6 +316,7 @@
fi
i=0
+ [ -b "$mdev" ] || blockdev --rereadpt $nbd
while :; do
[ -b "$mdev" ] && break
i=$(($i+1))
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https://bugs.launchpad.net/bugs/1741096
Title:
test-mic can fail / writes to qemu-nbd device do not persist
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