[Bug 1561103] Re: Multipath assigned user_friendly_names during initramfs
Launchpad Bug Tracker
1561103 at bugs.launchpad.net
Tue Apr 5 08:43:46 UTC 2016
This bug was fixed in the package multipath-tools -
0.5.0+git1.656f8865-5ubuntu2
---------------
multipath-tools (0.5.0+git1.656f8865-5ubuntu2) xenial; urgency=medium
[ Mauricio Faria de Oliveira ]
* Remove partition device nodes of individual paths (for LVM on multipath)
on the new multipath-tools with udev property blacklisting (LP: #1540401)
- debian/multipath-tools.dm-mpath-lvm.udev: replace 'multipath -c' with
'multipath -u' which can read udev properties at PROGRAM-rule time
(when udev properties are not yet written to the udev database).
- debian/initramfs/init-top: start multipathd before udev (required by
'multipath -u' in the udev rules)
- debian/initramfs/local-top: remove snippet to start multipathd.
* Remove debian/initramfs/local-top (redundant with other initramfs scripts):
- init-top: start multipathd.
- init-top: load modules (dm-multipath and SCSI device handlers); move the
missing dm-emc there (now scsi-dh-emc; see BTS 567014).
- local-premount: settle on udev events; and the extra call due to
multipath discovery in udev rules is no longer required with multipathd
in initramfs.
- debian/rules: do not install local-top anymore.
* debian/initramfs/local-premount: run multipath with -B so not to assign
names nor change /etc/multipath/bindings during initramfs (LP: #1561103)
* debian/patches/enable-find-multipaths.patch: re-enable find_multipaths
by default -- see the removed 'add_find-multipaths.patch' (LP: #1463046)
-- Mathieu Trudel-Lapierre <cyphermox at ubuntu.com> Mon, 04 Apr 2016
22:36:48 -0400
** Changed in: multipath-tools (Ubuntu)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/1561103
Title:
Multipath assigned user_friendly_names during initramfs
Status in multipath-tools package in Ubuntu:
Fix Released
Bug description:
== Comment: #0 - Mauricio Faria De Oliveira - 2016-03-23 10:40:56 ==
---Problem Description---
Multipath assigned user_friendly_names during initramfs
In the initramfs, there's one call to multipath which has no -B argument (local-premount).
It assigns new/different user_friendly_names to devices which might differ from that in the rootfs.
The names should not be assigned during initramfs time, and dealt w/ during rootfs time, then updated to initramfs accordingly.
--- Steps to Reproduce ---
Boot with break=pre-multipath,post-multipath:
Skip the 2 breakpoints in scripts/init-top/multipath.
...
(initramfs) exit
...
(initramfs) exit
starting version 229
...
Skip the 1st breakpoint in scripts/local-top/multipath.
(initramfs) exit
Begin: Loading multipath modules ... Success: loaded module dm-multipath.
Failure: failed to load module dm-emc.
done.
Begin: Starting multipathd ... Spawning shell within the initramfs
...
The multipath device names are not-user_friendly_names.
That is enabled, but there are no names defined in /etc/multipath/bindings,
so 'multipath -B' will not use user_friendly_names.
(initramfs) multipath -l -v1
36005076303ffd2a40000000000000349
36005076303ffd2a40000000000000348
36005076303ffd2a40000000000000347
36005076303ffd2a40000000000000346
(initramfs) grep user_friendly_names /etc/multipath.conf
user_friendly_names yes
(initramfs) cat /etc/multipath/bindings
# Multipath bindings, Version : 1.0
# NOTE: this file is automatically maintained by the multipath program.
# You should not need to edit this file in normal circumstances.
#
# Format:
# alias wwid
#
(initramfs)
Skip until the 1st breakpoint in /scripts/local-bottom/multipath:
(initramfs) exit
done.
Begin: Running /scripts/local-premount ... Begin: Waiting for udev to settle (multipath) ... done.
done.
...
Begin: Running /scripts/local-bottom ... Spawning shell within the initramfs
...
And now we've got user_friendly_names:
(initramfs) multipath -l -v1
mpathd
mpathc
mpathb
mpatha
That's because the multipath call in /scripts/local-premount/multipath
has no -B option.
(initramfs) grep multipath /scripts/local-premount/multipath
if [ -x /sbin/multipath ]
[ "$quiet" != "y" ] && log_begin_msg "Waiting for udev to settle (multipath)"
multipath -r -v0
And it changed the contents of /etc/multipath/bindings,
which is not desired for the initramfs (may conflict w/ the rootfs's file).
(initramfs) cat /etc/multipath/bindings
# Multipath bindings, Version : 1.0
# NOTE: this file is automatically maintained by the multipath program.
# You should not need to edit this file in normal circumstances.
#
# Format:
# alias wwid
#
mpatha 36005076303ffd2a40000000000000346
mpathb 36005076303ffd2a40000000000000347
mpathc 36005076303ffd2a40000000000000348
mpathd 36005076303ffd2a40000000000000349
(initramfs)
--- Solution verification ---
On another boot, appending -B on that multipath command, things work
fine:
(initramfs) sed -i '/multipath -r/ s/$/ -B/' /scripts/local-
premount/multipath
(initramfs) grep multipath /scripts/local-premount/multipath
if [ -x /sbin/multipath ]
[ "$quiet" != "y" ] && log_begin_msg "Waiting for udev to settle (multipath)"
multipath -r -v0 -B
(initramfs) exit # a few times until
...
Begin: Running /scripts/local-bottom ... Spawning shell within the initramfs
...
(initramfs) multipath -l -v1
36005076303ffd2a40000000000000349
36005076303ffd2a40000000000000348
36005076303ffd2a40000000000000347
36005076303ffd2a40000000000000346
(initramfs) cat /etc/multipath/bindings
# Multipath bindings, Version : 1.0
# NOTE: this file is automatically maintained by the multipath program.
# You should not need to edit this file in normal circumstances.
#
# Format:
# alias wwid
#
(initramfs)
== Comment: #3 - Mauricio Faria De Oliveira - 2016-03-23 10:43:24 ==
Hi @taco-screen-team,
@mathieu-tl is the suggested contact for this bug (multipath bugs et
al.)
Thanks
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