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Bug#856589: initramfs-tools: mkinitramfs fails to run on systems with tmpfs on /

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Package: initramfs-tools
Version: 0.120+deb8u2
Severity: normal

Hi,

I am trying to configure kdump-tools on a Debian jessie live system
(which runs entirely on tmpfs mount points using a custom made initrd).
kdump-tools uses initramfs-tools to generate an initramfs for the crash
kernel. On package installation, it runs:

  root@host:~$ /etc/kernel/postinst.d/kdump-tools $(uname -r)
  kdump-tools: Generating /var/lib/kdump/initrd.img-4.4.36-2
  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.

Since kdump-tools specifies a config directory, the suggested grep
command is incorrect (patch to fix that is attached).

  root@host:~$ grep -r MODULES /var/lib/kdump/initramfs-tools/
  /var/lib/kdump/initramfs-tools/initramfs.conf:# MODULES: [ most | netboot | dep | list ]
  /var/lib/kdump/initramfs-tools/initramfs.conf:MODULES=dep

The recommended workaround (set MODULES=most) does not work either:

  root@host:~$ sudo sed -i "s/MODULES=dep/MODULES=most/" /var/lib/kdump/initramfs-tools/initramfs.conf
  root@host:~$ grep -r MODULES /var/lib/kdump/initramfs-tools/
  /var/lib/kdump/initramfs-tools/initramfs.conf:# MODULES: [ most | netboot | dep | list ]
  /var/lib/kdump/initramfs-tools/initramfs.conf:MODULES=most
  root@host:~$ sudo /etc/kernel/postinst.d/kdump-tools $(uname -r)
  kdump-tools: Generating /var/lib/kdump/initrd.img-4.4.36-2
  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.

Here is the requeted output of mount (/proc/mounts says the same):

  root@host:~$ mount
  proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
  sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
  udev on /dev type devtmpfs (rw,relatime,size=755840k,nr_inodes=188960,mode=755)
  tmpfs on / type tmpfs (rw,relatime,size=2097152k)
  tmpfs on /var type tmpfs (rw,nodev,relatime,size=1048576k)
  tmpfs on /var/log type tmpfs (rw,nosuid,nodev,noexec,relatime,size=204800k)
  tmpfs on /tmp type tmpfs (rw,nosuid,nodev,relatime,size=524288k)
  tmpfs on /home type tmpfs (rw,nosuid,nodev,relatime,size=102400k)
  securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
  tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
  devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
  tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
  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)
  cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
  cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
  cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
  cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
  cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
  cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls)
  systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=22,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
  configfs on /sys/kernel/config type configfs (rw,relatime)
  mqueue on /dev/mqueue type mqueue (rw,relatime)
  hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
  debugfs on /sys/kernel/debug type debugfs (rw,relatime,mode=755)
  fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)

Workaround: Comment all calls in dep_add_modules() in hook-functions.

-- 
Benjamin Drung
System Developer
Debian & Ubuntu Developer

ProfitBricks GmbH
Greifswalder Str. 207
D - 10405 Berlin

Email: benjamin.drung@profitbricks.com
URL:  http://www.profitbricks.com

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Registergericht: Amtsgericht Charlottenburg, HRB 125506B.
Geschäftsführer: Andreas Gauger, Achim Weiss.

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Bug#856589: initramfs-tools: mkinitramfs fails to run on systems with tmpfs on / Benjamin Drung <benjamin.drung@profitbricks.com> - 2017-03-02 19:30 +0100
  Bug#856589: initramfs-tools: mkinitramfs fails to run on systems with tmpfs on / Benjamin Drung <benjamin.drung@profitbricks.com> - 2017-03-03 22:20 +0100
  Bug#856589: initramfs-tools: mkinitramfs fails to run on systems with tmpfs on / Ben Hutchings <ben@decadent.org.uk> - 2017-03-07 00:00 +0100
    Bug#856589: mkinitramfs fails with MODULES=dep and root on tmpfs Benjamin Drung <benjamin.drung@profitbricks.com> - 2017-03-07 18:10 +0100
      Bug#856589: mkinitramfs fails with MODULES=dep and root on tmpfs Ben Hutchings <ben@decadent.org.uk> - 2017-03-07 19:00 +0100

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