[Bug 802626] Re: vgchange may deadlock in initramfs when VG present that's not used for rootfs

[Seth Jennings]

I also am experiencing the 60 second delay on startup with -14 and not
with -13.  According to the Ubuntu to Mainline map, 3.0.0-13.22 maps to
3.0.6 and 3.0.0-14.23 maps to 3.0.9.  I bisected the commits over that
range and determined that reverting the following commit corrects this
issue:

7b59e3e29e1a28ad40892dd2115175e2702f1153 kobj_uevent: Ignore if some listeners c
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 70af0a7..ad72a03 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -282,7 +282,7 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_ac
                                                            kobj_bcast_filter,
                                                            kobj);
                        /* ENOBUFS should be handled in userspace */
-                       if (retval == -ENOBUFS)
+                       if (retval == -ENOBUFS || retval == -ESRCH)
                                retval = 0;
                } else
                        retval = -ENOMEM;

This comment on related defect 818177 references the lkml.org post where
the patch was submitted.

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/818177/comments/67

It seems like there might be a history of this bug before -13, but this
commit definitely exposed it more.

The fix for 818177 is already released for Precise but is still just
committed for Oneiric.

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https://bugs.launchpad.net/bugs/802626

Title:
  vgchange may deadlock in initramfs when VG present that's not used for
  rootfs

Status in “lvm2” package in Ubuntu:
  Triaged
Status in “udev” package in Ubuntu:
  Confirmed
Status in “lvm2” source package in Oneiric:
  Triaged
Status in “udev” source package in Oneiric:
  Confirmed

Bug description:
  The system is now unable to boot.
  I had to boot on previous kernel 3.0.0.
  Symptoms are boot freezes. When debugging, issuing a vgscan works ok.
  doing the vgchange -a y just hangs. I need to reboot the system afterwards.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: lvm2 2.02.66-4ubuntu2
  ProcVersionSignature: Ubuntu 3.0-0.1-generic 3.0.0-rc2
  Uname: Linux 3.0-0-generic x86_64
  Architecture: amd64
  Date: Mon Jun 27 18:15:46 2011
  ProcEnviron:
   LANGUAGE=fr_FR:en
   PATH=(custom, user)
   LANG=fr_FR.utf8
   LC_MESSAGES=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: lvm2
  UpgradeStatus: No upgrade log present (probably fresh install)

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