[Bug 818177] Re: boot failures caused by udev race

[Serge Hallyn]

Quoting Steve Langasek (steve.langasek at canonical.com):
> On Thu, Oct 06, 2011 at 01:20:03AM -0000, Serge Hallyn wrote:
> > also see bug 833891 as a udev bug specifically for the LVM case.
> 
> Do you mean you're already tracking the LVM case on that bug instead, and

I was, yes.  I filed that one some time ago to track the hang on my own
laptop.  I realize there are too many open bugs on this, and we should
mark some as dupes.

> that in the setup you're using there is *no* use of LVM?  I guess no
one

Yes.

> told Adam that this is a different bug, because it was his LVM-based setup
> that I was responding to... :)

Right.

> > In fact, Eduard toward the end speculated precisely the semaphore as a
> > cause as you just did.
> 
> That was Eduard's speculation, copied from the *other* bug I linked to.

Right.

NOTE though:

The LVM authors have admonished us for calling vgscan/vgchange in a udev
rule, as that has its own deadlock potential.  My debdiff in bug 833891
is meant to address that.  It sounds like that deadlock is separate from
the speculation above.  Although perhaps not - such a deadlock could
explain why a semaphore in udevd is not getting Vd (since udevd never
finishes its processing of that rule, but just gets killed on timeout)?

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to udev in Ubuntu.
https://bugs.launchpad.net/bugs/818177

Title:
  boot failures caused by udev race

Status in “linux” package in Ubuntu:
  Invalid
Status in “udev” package in Ubuntu:
  Confirmed
Status in “linux” source package in Oneiric:
  Invalid
Status in “udev” source package in Oneiric:
  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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/818177/+subscriptions