[Bug 906358] Re: udev and lvm2 hang at boot

[Christian Weiske]

The machine I have problems with has this partition setup:

$ LC_ALL=C fdisk -l /dev/sda

Disk /dev/sda: 1500.3 GB, 1500301910016 bytes
255 heads, 63 sectors/track, 182401 cylinders, total 2930277168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000b8523

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *          63     1048638      524288   83  Linux
/dev/sda3       126881370  2930272064  1401695347+   5  Extended
/dev/sda5       126881433   246870854    59994711   83  Linux
/dev/sda6       246870918   254871224     4000153+  82  Linux swap / Solaris
/dev/sda7       254871288  2930272064  1337700388+  83  Linux

sda7 is the partition on which i have my lvm setup:

$ lvmdiskscan |grep LVM
  /dev/sda7  [       1,25 TiB] LVM physical volume
  0 LVM physical volume whole disks
  1 LVM physical volume


LVM setup:

$ lvm vgs
  VG    #PV #LV #SN Attr   VSize VFree  
  Daten   1   2   0 wz--n- 1,25t 575,73g
$ lvm lvs
  LV    VG    Attr   LSize   Origin Snap%  Move Log Copy%  Convert
  games Daten -wi-ao 400,00g                                      
  homes Daten -wi-ao 300,00g                                      

Mounts:
/dev/mapper/Daten-homes on /home type ext4 (rw,commit=0)
/dev/mapper/Daten-games on /home/spiele type ext4 (rw,commit=0)

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https://bugs.launchpad.net/bugs/906358

Title:
  udev and lvm2 hang at boot

Status in “udev” package in Ubuntu:
  Incomplete

Bug description:
  I'm experiencing a really long wait when booting freshly installed
  xubuntu 11.10 with only updates and mdadm + lvm2 installed. I have
  managed to narrow it down somewhat but still looking for a fix.

  After disabling splash and quiet from grub I noticed it's waiting at /scripts/init-bottom/udev in initrd and continues after 61 seconds.
  Not surprisingly i found a "udevadm control --timeout 61 --exit" line in there. Well, why does it fail so badly it waits for timeout before exiting?

  After quite a bit of googling I found this:
  http://us.generation-nt.com/answer/problem-lvm-gets-stuck-during-booting-due-recent-uevent-change-help-205241751.html
  Ari Savolainen writes:
  An init script (/scripts/init-bottom/udev in initrd) issues command
  "udevadm control --timeouta --exit".
  At the same time udevd is executing "/sbin/lvm vgchange -a y" (from
  /lib/udev/rules.d/85-lvm2.rules) that calls ioctl to resume a logical
  volume. After that lvm gets stuck forever. Booting continues after the
  61 second timeout.

  Milan Broz writes:
  If you call vgchange or even vgscan from udev rule, it is completely wrong.
  This is not lvm upstream udev rule btw.

  This makes me slightly worried, does this cause any other problems
  than a annoyingly slow boot? Is there any way to fix this? I this a
  known issue?

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