I ran this loop for some 100 iterations without failure:
sudo sh -exc 'while true; do qemu-nbd --snapshot --connect /dev/nbd0
/srv/vm/adt-vivid-i386-cloud.img; sleep 0.5; [ -e /dev/nbd0p1 ]; mount
/dev/nbd0p1 /mnt; [ -d /mnt/root ]; umount /mnt; qemu-nbd --disconnect
/dev/nbd0; sleep 0.5; [ ! -e /dev/nbd0p1 ]; done'
(You need to change the VM image, obviously). Maybe in your experiments
you forgot a disconnect or so? If you can still reproduce this, please
attach the output of "journalctl -b" after you run into an error, and
check that you have no leftover /dev/nbd* devices.
However, systemd or udev don't actually create or manage /dev/*, that's
the kernel driver.
** Changed in: qemu (Ubuntu)
Importance: High => Medium
** Changed in: qemu (Ubuntu)
Status: Confirmed => Incomplete
** Summary changed:
- vivid: systemd breaks qemu-nbd mounting
+ disconnecting qemu-nbd leaves device node behind
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https://bugs.launchpad.net/bugs/1435428
Title:
disconnecting qemu-nbd leaves device node behind
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