[Bug 818177] Re: HP DL380G5 root disk mounted read-only on boot and boot fails

[Serge Hallyn]

Quoting Stefan Bader (stefan.bader at canonical.com):
> This looks quite like it is likely related to /usr/share/initramfs-
> tools/scripts/init-bottom/udev. How things should work is:

This is also where it appears to hang on my systems.

> - we got the initramfs mounted as initial /
> - udev gets started and left running until the real root device node becomes available
> - now udev gets stopped (used to be clubbed to death which caused even more problems) and /dev is tried to be
>   moved to <realroot>/dev.
> - <newroot> bcomes /,  restart udev, and things should proceed from there
> 
> >From the serial console log of comment #18 it looks like things went ok
> until the time udev should stop. There is no error message there but
> somehow it looks like fsck in the new / does not find the uuid link for
> it. Unclear whether maybe the move of /dev did not work, or did the
> previous step resolve the uuid to dev without the symlink? As Adam
> mentioned before, allowing udev to settle helps. So the race is
> somewhere there. Whoever can reproduce this may want to add additional
> echo's to the init-bottom script.

(TBH I don't believe anyone can 'not reproduce it'.  It sometimes takes
me 10 boots, but a standard ubuntu server kvm vm with a single primary
partition on virtio occasionally hangs there as well).

I've tried adding echos, but as near as I can tell, adding any echo
before the udevadm control --exit stops the hang.  I rebooted 10 times
last night trying to do a 'ps -ef' before it, but that seemed to slow it
down just enough to stop the race.

I've tried (blindly) installing a recompiled udev which keeps handling
inotify events while waiting to exit, but that doesn't seem to be the
problem.  It looks as though udevadm control --exit simply is hanging.

Perhaps some debug statements in udevd itself will be more helpful.
(will try)

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https://bugs.launchpad.net/bugs/818177

Title:
  HP DL380G5 root disk mounted read-only on boot and boot fails

Status in “linux” package in Ubuntu:
  Incomplete
Status in “udev” package in Ubuntu:
  Confirmed

Bug description:
  After running a do-release-upgrade -d on a natty server, I'm unable to
  boot the machine properly.

  It looks like it doesn't see the local disks anymore.

  I think this looks quite a lot like the debbug linked from here:
  https://bugs.launchpad.net/ubuntu/oneiric/+source/linux/+bug/746751

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-7-server 3.0.0-7.8
  ProcVersionSignature: Ubuntu 3.0.0-7.8-server 3.0.0
  Uname: Linux 3.0.0-7-server x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 2011-07-29 13:34 seq
   crw-rw---- 1 root audio 116, 33 2011-07-29 13:34 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  Date: Fri Jul 29 13:40:10 2011
  HibernationDevice: RESUME=UUID=844d17fa-ff69-4250-844b-33b930236c56
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
  MachineType: HP ProLiant DL380 G5
  PciMultimedia:
   
  ProcEnviron:
   LANGUAGE=en_US:
   PATH=(custom, user)
   LANG=en_US
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.0.0-7-server root=/dev/mapper/User Name-root ro INIT_VERBOSE=yes
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-7-server N/A
   linux-backports-modules-3.0.0-7-server  N/A
   linux-firmware                          1.56
  RfKill: Error: [Errno 2] No such file or directory
  SourcePackage: linux
  UpgradeStatus: Upgraded to oneiric on 2011-07-29 (0 days ago)
  dmi.bios.date: 06/28/2007
  dmi.bios.vendor: HP
  dmi.bios.version: P56
  dmi.chassis.type: 23
  dmi.chassis.vendor: HP
  dmi.modalias: dmi:bvnHP:bvrP56:bd06/28/2007:svnHP:pnProLiantDL380G5:pvr:cvnHP:ct23:cvr:
  dmi.product.name: ProLiant DL380 G5
  dmi.sys.vendor: HP

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