[Bug 906358] Re: udev and lvm2 hang at boot
Christian Weiske
cweiske at cweiske.de
Wed Jan 18 19:12:06 UTC 2012
I can reproduce the issue using Virtualbox 4.1.2 on ubuntu 64bit, 8gib
disk
1. install a fresh system: ubuntu 11.10 desktop amd64
2. during installation: manual partitioning, 4gib ext4 for /, no other partition
3. after installation: run gparted, create new partition on the rest of the disk (4gib) without file system (uninitialized)
4. run system-config-lvm: init partition 2 (the newly created one)
4.1 add lvmdisk1, 2gib, ext4
4.2 add lvmdisk2, 1gib, ext4
5. reboot
6. wait 60 seconds
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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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