** Changed in: linux (Ubuntu Xenial)
Status: New => In Progress
** Changed in: linux (Ubuntu Xenial)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Xenial)
Assignee: Canonical Kernel (canonical-kernel) => Joseph Salisbury
(jsalisbury)
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https://bugs.launchpad.net/bugs/696435
Title:
wait-for-root fails to detect nbd root
Status in linux package in Ubuntu:
Fix Released
Status in nbd package in Ubuntu:
Invalid
Status in systemd package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
In Progress
Status in systemd source package in Xenial:
Incomplete
Bug description:
When using an nbd root, wait-for-root blocks for 30 seconds before
booting continues successfully.
Using Ubuntu Natty, related packages versions:
nbd-client 1:2.9.16-6ubuntu1
initramfs-tools 0.98.1ubuntu9
The wait-for-root call from /usr/share/initramfs-tools/scripts/local:
while [ -z "${FSTYPE}" ]; do
FSTYPE=$(wait-for-root "${ROOT}" ${ROOTDELAY:-30})
# Run failure hooks, hoping one of them can fix up the system
# and we can restart the wait loop. If they all fail, abort
# and move on to the panic handler and shell.
if [ -z "${FSTYPE}" ] && ! try_failure_hooks; then
break
fi
done
I replaced wait-for-root with a sh script that did `set >&2`, here are the
relevant environment variables at the time wait-for-root was called:
ROOT='/dev/nbd0'
ROOTDELAY=''
ROOTFLAGS=''
ROOTFSTYPE=''
nbdroot='192.168.0.1,2011'
It's probably worth noting that "nbd0: unknown partition table" was
displayed asynchronously 1-2 seconds after wait-for-root was invoked
and while it was still waiting. But I tried adding a "sleep 5" as the
last line of local-top/nbd, so that the nbd message was displayed a
lot before wait-for-root was called, and it didn't make a difference.
So I don't think a race condition is involved in this problem.
Temporarily I'm passing rootdelay=1 in the kernel command line to work
around the problem.
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