[Bug 1661629] Re: upgrade of kernel fails with mkinitramfs: failed to determine device for /

[Robie Basak]

Thank you for taking the time to file this patch and helping to make
Ubuntu better.

Does this apply and work correctly on the current Ubuntu development
release (Cosmic) please? We land changes there first and only once
successful consider backporting to existing releases as appropriate.

> With this change I was able to build a image using "MODULES=dep" and
successfully create a crash dump with zfs on root.

What sort of block device was backing your filesystem in your test case
please? I'm not particularly familiar with this part of initramfs-tools,
but it seems to me that essentials like the loading of the virtio_pci
module would be short-circuited by your patch. Do you have an opinion on
this?

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https://bugs.launchpad.net/bugs/1661629

Title:
  upgrade of kernel fails with mkinitramfs: failed to determine device
  for /

Status in initramfs-tools package in Ubuntu:
  Confirmed

Bug description:
  When upgrading packages with "apt upgrade" on Ubuntu 16.04.1 LTS with
  root on ZFS I get this error:

  Setting up linux-image-4.4.0-59-generic (4.4.0-59.80) ...
  Running depmod.
  update-initramfs: deferring update (hook will be called later)
  Examining /etc/kernel/postinst.d.
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-59-generic /boot/vmlinuz-4.4.0-59-generic
  run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-59-generic /boot/vmlinuz-4.4.0-59-generic
  update-initramfs: Generating /boot/initrd.img-4.4.0-59-generic
  run-parts: executing /etc/kernel/postinst.d/kdump-tools 4.4.0-59-generic /boot/vmlinuz-4.4.0-59-generic
  kdump-tools: Generating /var/lib/kdump/initrd.img-4.4.0-59-generic
  mkinitramfs: failed to determine device for /
  mkinitramfs: workaround is MODULES=most, check:
  grep -r MODULES /etc/initramfs-tools/

  Error please report bug on initramfs-tools
  Include the output of 'mount' and 'cat /proc/mounts'
  update-initramfs: failed for  with 1.
  run-parts: /etc/kernel/postinst.d/kdump-tools exited with return code 1
  Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/linux-image-4.4.0-59-generic.postinst line 1052.
  dpkg: error processing package linux-image-4.4.0-59-generic (--configure):
   subprocess installed post-installation script returned error exit status 2

  version of initramfs-tools is 0.122ubuntu8.8

  
  Output of mount is:

  sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
  proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
  udev on /dev type devtmpfs (rw,nosuid,relatime,size=8066020k,nr_inodes=2016505,mode=755)
  devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
  tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=1623576k,mode=755)
  rpool/ROOT/ubuntu on / type zfs (rw,relatime,xattr,noacl)
  securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
  tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
  tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
  tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
  cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
  pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
  cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
  cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
  cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
  cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
  cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
  cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
  cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
  cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
  cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
  cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
  mqueue on /dev/mqueue type mqueue (rw,relatime)
  hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
  systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=31,pgrp=1,timeout=0,minproto=5,maxproto=5,direct)
  debugfs on /sys/kernel/debug type debugfs (rw,relatime)
  fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
  rpool/home on /home type zfs (rw,nosuid,noatime,xattr,noacl)
  rpool/home/fredrik on /home/fredrik type zfs (rw,nosuid,noatime,xattr,noacl)
  rpool/home/root on /root type zfs (rw,nosuid,noatime,xattr,noacl)
  rpool/srv on /srv type zfs (rw,noatime,xattr,noacl)
  rpool/var/cache on /var/cache type zfs (rw,nosuid,noexec,noatime,xattr,noacl)
  rpool/var/log on /var/log type zfs (rw,nosuid,noexec,noatime,xattr,noacl)
  rpool/var/spool on /var/spool type zfs (rw,nosuid,noexec,noatime,xattr,noacl)
  rpool/var/tmp on /var/tmp type zfs (rw,nosuid,noatime,xattr,noacl)
  tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=1623576k,mode=700,uid=1000,gid=1000)
  binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,relatime)
  tracefs on /sys/kernel/debug/tracing type tracefs (rw,relatime)

  cat /proc/mounts 
  sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
  proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
  udev /dev devtmpfs rw,nosuid,relatime,size=8066020k,nr_inodes=2016505,mode=755 0 0
  devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
  tmpfs /run tmpfs rw,nosuid,noexec,relatime,size=1623576k,mode=755 0 0
  rpool/ROOT/ubuntu / zfs rw,relatime,xattr,noacl 0 0
  securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
  tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0
  tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0
  tmpfs /sys/fs/cgroup tmpfs ro,nosuid,nodev,noexec,mode=755 0 0
  cgroup /sys/fs/cgroup/systemd cgroup rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd 0 0
  pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0
  cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0
  cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0
  cgroup /sys/fs/cgroup/net_cls,net_prio cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio 0 0
  cgroup /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory 0 0
  cgroup /sys/fs/cgroup/hugetlb cgroup rw,nosuid,nodev,noexec,relatime,hugetlb 0 0
  cgroup /sys/fs/cgroup/cpu,cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0
  cgroup /sys/fs/cgroup/pids cgroup rw,nosuid,nodev,noexec,relatime,pids 0 0
  cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0
  cgroup /sys/fs/cgroup/perf_event cgroup rw,nosuid,nodev,noexec,relatime,perf_event 0 0
  cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0
  mqueue /dev/mqueue mqueue rw,relatime 0 0
  hugetlbfs /dev/hugepages hugetlbfs rw,relatime 0 0
  systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=31,pgrp=1,timeout=0,minproto=5,maxproto=5,direct 0 0
  debugfs /sys/kernel/debug debugfs rw,relatime 0 0
  fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
  rpool/home /home zfs rw,nosuid,noatime,xattr,noacl 0 0
  rpool/home/fredrik /home/fredrik zfs rw,nosuid,noatime,xattr,noacl 0 0
  rpool/home/root /root zfs rw,nosuid,noatime,xattr,noacl 0 0
  rpool/srv /srv zfs rw,noatime,xattr,noacl 0 0
  rpool/var/cache /var/cache zfs rw,nosuid,noexec,noatime,xattr,noacl 0 0
  rpool/var/log /var/log zfs rw,nosuid,noexec,noatime,xattr,noacl 0 0
  rpool/var/spool /var/spool zfs rw,nosuid,noexec,noatime,xattr,noacl 0 0
  rpool/var/tmp /var/tmp zfs rw,nosuid,noatime,xattr,noacl 0 0
  tmpfs /run/user/1000 tmpfs rw,nosuid,nodev,relatime,size=1623576k,mode=700,uid=1000,gid=1000 0 0
  binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,relatime 0 0
  tracefs /sys/kernel/debug/tracing tracefs rw,relatime 0 0

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