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

[Steve Langasek]

I'm not sure if there's a kernel bug here (there might be?), but I'm
pretty sure there is a udev bug, as indicated by the linked branch.
However, just adding an extra 'udevadm settle' to the initramfs before
killing udev is not sufficient to fix the race conditions here; udevadm
settle + udevadm control --exit is not atomic, which means any new
events that arrive in between the two calls might still be lost by
whatever's going on in udevadm control.

udevadm control --exit needs to be made robust, to ensure that any
events already being processed by udev at the time it's called get fully
processed, and not lost in the middle as seems to be happening now.


** Also affects: udev (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: udev (Ubuntu)
       Status: New => Confirmed

** Changed in: udev (Ubuntu)
   Importance: Undecided => High

** Changed in: udev (Ubuntu)
     Assignee: (unassigned) => Ubuntu Foundations Team (ubuntu-foundations-team)

** Changed in: linux (Ubuntu)
     Assignee: Ubuntu Foundations Team (ubuntu-foundations-team) => (unassigned)

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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:
  Confirmed
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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