[Bug 453678] Re: udev initramfs hook ignores that udevadm is disabled, copies it anyway

[Rolf Leggewie]

** Changed in: apt (Ubuntu Karmic)
       Status: Triaged => Won't Fix

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Title:
  udev initramfs hook ignores that udevadm is disabled, copies it anyway

Status in “apt” package in Ubuntu:
  Triaged
Status in “apt” source package in Karmic:
  Won't Fix

Bug description:
  Binary package hint: udev

  I've just experienced a perfect storm of bugs during an upgrade, which
  I will relate here for its amusement value rather than for its
  relevance in fixing the bug that I am currently filing.

  During an upgrade to the latest karmic - which somehow managed to find
  over 150 distinct packages in need of upgrading - the 'restart udev'
  command in the middle of the udev upgrade hung.

  'sudo initctl log-priority debug' also hung - in the 'sudo' part, not
  the 'initctl' part.  Trying to run 'sudo' anywhere else obviously also
  hangs.

  Switching to VT 1 and trying to log in, the login is accepted... and
  then hangs right after pam_motd, without giving me a shell (this
  points to pam_ck_connector having problems).

  So switching back and forth between X and VT1 and trying a few
  different things to get myself unwedged, something gets confused on
  the audio side, causing my speakers to repeat a single sample from the
  music I had playing.  So I try to kill pulseaudio and get it to
  restart.

  Killing pulseaudio alerts gnome-settings-daemon, which tries to
  reconnect, which hangs... thereby hanging metacity.

  So now I can't type in any of my X terminals either.

  So I use SysRq-E, which succeeds in killing the processes and
  respawning them... aside from the fact that X comes back without a
  keyboard or mouse.

  And of course openssh isn't managed by upstart yet, so I can't log in
  remotely.

  So I reboot, and that's when the fun starts... because among the
  packages that was upgraded before udev hung was the kernel.  Which
  means that when the package was configured, a new initramfs was
  generated... while udev was in an unconfigured state.  Which means
  that when /sbin/udevadm was copied into the new initramfs, it wasn't
  /sbin/udevadm.

  Output I should never see from my initramfs at boot time:

    udevadm trigger is not permitted while udev is unconfigured.
    udevadm settle is not permitted while udev is unconfigured.

  Fortunately, I had an earlier kernel installed so I could boot from it
  and recover - but the udev initramfs hook should *never* do this.
  Either it should explicitly grab /sbin/udevadm.upgrade if present and
  copy it in place of /sbin/udevadm, or it should detect
  /sbin/udevadm.upgrade and *abort* the initramfs generation.

  What I can't figure out is how the linux package was configured at all
  under these circumstances: linux-image-2.6.31-14-generic depends on
  initramfs-tools, and initramfs-tools depends on udev.  So there should
  have been no point at which update-initramfs would have been called
  while udev was unconfigured.  So maybe this isn't a udev bug at all,
  but a bug in update-manager.

  Here, though, are the relevant bits of /var/log/dpkg.log.

  2009-10-16 17:37:32 upgrade linux-image-2.6.31-14-generic 2.6.31-14.46 2.6.31-14.48
  2009-10-16 17:37:32 status half-configured linux-image-2.6.31-14-generic 2.6.31-14.46
  2009-10-16 17:37:32 status unpacked linux-image-2.6.31-14-generic 2.6.31-14.46
  2009-10-16 17:37:32 status half-installed linux-image-2.6.31-14-generic 2.6.31-14.46
  2009-10-16 17:37:53 status half-installed linux-image-2.6.31-14-generic 2.6.31-14.46
  2009-10-16 17:37:56 status unpacked linux-image-2.6.31-14-generic 2.6.31-14.48
  2009-10-16 17:37:58 status unpacked linux-image-2.6.31-14-generic 2.6.31-14.48
  2009-10-16 17:38:40 upgrade udev 147~-5 147~-6
  2009-10-16 17:38:40 status half-configured udev 147~-5
  2009-10-16 17:38:40 status unpacked udev 147~-5
  2009-10-16 17:38:40 status half-installed udev 147~-5
  2009-10-16 17:38:40 status half-installed udev 147~-5
  2009-10-16 17:38:40 status half-installed udev 147~-5
  2009-10-16 17:38:41 status half-installed udev 147~-5
  2009-10-16 17:38:41 status unpacked udev 147~-6
  2009-10-16 17:38:41 status unpacked udev 147~-6
  2009-10-16 17:41:49 configure linux-image-2.6.31-14-generic 2.6.31-14.48 2.6.31-14.48
  2009-10-16 17:41:49 status unpacked linux-image-2.6.31-14-generic 2.6.31-14.48
  2009-10-16 17:41:49 status half-configured linux-image-2.6.31-14-generic 2.6.31-14.48
  2009-10-16 17:42:12 status installed linux-image-2.6.31-14-generic 2.6.31-14.48
  2009-10-16 17:42:55 configure udev 147~-6 147~-6
  2009-10-16 17:42:55 status unpacked udev 147~-6
  2009-10-16 17:42:55 status unpacked udev 147~-6
  2009-10-16 17:42:55 status unpacked udev 147~-6
  2009-10-16 17:42:55 status unpacked udev 147~-6
  2009-10-16 17:42:56 status unpacked udev 147~-6
  2009-10-16 17:42:56 status unpacked udev 147~-6
  2009-10-16 17:42:56 status unpacked udev 147~-6
  2009-10-16 17:42:56 status half-configured udev 147~-6
  <crash>

  ProblemType: Bug
  Architecture: amd64
  CustomUdevRuleFiles: 56-hpmud_support.rules 60-persistent-storage.rules.dpkg-old 60-persistent-storage.rules.dpkg-bak kino.rules
  Date: Fri Oct 16 20:10:17 2009
  DistroRelease: Ubuntu 9.10
  MachineType: LENOVO 6371CTO
  Package: udev 147~-6
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcCmdLine: root=/dev/mapper/hostname-root ro quiet splash
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
  SourcePackage: udev
  Uname: Linux 2.6.31-14-generic x86_64
  dmi.bios.date: 12/27/2006
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7IET23WW (1.04 )
  dmi.board.name: 6371CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr7IET23WW(1.04):bd12/27/2006:svnLENOVO:pn6371CTO:pvrThinkPadT60:rvnLENOVO:rn6371CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 6371CTO
  dmi.product.version: ThinkPad T60
  dmi.sys.vendor: LENOVO

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