PROBLEM: lvm gets stuck during booting due to recent uevent change

[Ari Savolainen]

After commit ebf4127cd677 "kobj_uevent: Ignore if some listeners
cannot handle message" in the current development tree lvm gets stuck
during booting and never recovers.

The machine has Ubuntu 11.10. Here is what happens:

An init script (/scripts/init-bottom/udev in initrd) issues command
"udevadm control --timeout=61 --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.

Here is part of lvm backtrace from gdb (ioctl is called just before
dm_udev_wait from another function):

#0  0x00007f56d6d37797 in semop () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f56d720a75c in dm_udev_wait (cookie=223208589) at libdm-common.c:1279
#2  0x0000000000476d5f in _tree_action (dm=0xaa0680,
lv=0xffffffffffffff69, action=ACTIVATE) at activate/dev_manager.c:1479
#3  0x0000000000477a4e in dev_manager_activate (dm=0xaa0680,
lv=0xa9caf0) at activate/dev_manager.c:1505
#4  0x000000000042ebcc in _lv_activate_lv (lv=0xa9caf0) at
activate/activate.c:570
...
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