Bug#859156: multipath-tools: boot ends in rescue mode - boot partition marked as systemd_ready=0

[Alban Browaeys]

Package: multipath-tools
Version: 0.6.4-5
Severity: normal

systemd at bootup mounts / and /home both lvm2 logical volumes above
bcache0 physical volume. But then it timeout waiting for /boot and
/boot/efi device UUIDs... and fallbacks to the rescue shell.


I flushed all entries from /etc/multipath/wwids (after backing it up)
and now all is fine.
Leaving the above entries there and commenting out 60-multipath.rules the code
which sets SYSTEMD_READ=0 also let me boot properly.

>From tests, where sda7 is /boot a "bare metal" partition:
sudo sh -c "env - SEQNUM="1" ACTION="add" $(udevadm info  -x /dev/sda7|sed -n '/^E:/ {   s at E: \(.*\)=\(.*\)@\1="\2"@p  }' | tr '\n' ' ' )  /sbin/multipath -u /dev/sda7; ";echo $?
with wwids cleanup up I get:
/dev/sda7 is not a valid multipath device path
1
but with wwids restored:
sda7 is a valid multipath device path
0
thus SYSTEMD_READY="0" and DM_MULTIPATH_DEVICE_PATH="1" are both set.
Thus systemd waits and timeout bringing the /boot device unit (then the mount unit fails
 because of dependency to this device unit).



Configuration is a bit uncommon:
/boot and /boot/efi on sda<n> partitions
bcache (backing and caching devices are sda<n> partition and sdb disk)
is an lvm2 physical volume, above that are mostly root / and /home
logical volumes.


This is pretty serious an issue (fail to boot) though I have been unable to sort out
if the wwids file entries  I cleanup were a local issue, another package issue
or added by multipathd itself.
They were not restored after reboot.

Best regards
Alban


PS: mind my current is a local binnmu per I fixed a locking bug in uev_update_path when called
by udev. This should not relate to this issue. Pending another bug report.


-- Package-specific info:
/etc/multipath.conf does not exist.


-- System Information:
Debian Release: 9.0
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (500, 'testing'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.10.0-trunk-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages multipath-tools depends on:
ii  init-system-helpers  1.47
ii  kpartx               0.6.4-5.1
ii  libaio1              0.3.110-3
ii  libc6                2.24-9
ii  libdevmapper1.02.1   2:1.02.137-2
ii  librados2            10.2.5-6
ii  libreadline7         7.0-2
ii  libsystemd0          232-22
ii  libudev1             232-22
ii  liburcu4             0.9.3-3
ii  lsb-base             9.20161125
ii  sg3-utils-udev       1.42-2
ii  udev                 232-22

multipath-tools recommends no packages.

Versions of packages multipath-tools suggests:
ii  multipath-tools-boot  0.6.4-5.1

-- no debconf information