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#1 2012-07-24 02:32:23

laloch
Member
Registered: 2010-02-04
Posts: 181

linux 3.5 - lvm boot troubles

Hello,

probably due to somewhat slower detection of devices in the latest device-mapper driver I had to add "lvmwait=/dev/mapper/<root-volume> rootdelay=1" kernel command-line parameters in order to boot my system normally. I'm writing this just in case someone runs into the "Activating logical volumes... No volume groups found" message while booting her lvm-rooted system.

edit: this was more an ugly workaround rather than real solution

Last edited by laloch (2012-07-24 21:41:49)

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#2 2012-07-24 03:35:06

boypt
Member
Registered: 2009-09-25
Posts: 11

Re: linux 3.5 - lvm boot troubles

Confirmed.

I have a LVM root, kernel 3.5-1 fail to boot reporting:

No volume groups found,

and drop me to the busybox shell.

In the busybox I execute this commands:

lvm vgchange -ay

lvm reports the following message:

//sbin/dmeventd: stat failed: No such file or directory

But still it managed to find other logical volumes. Now i quit the busybox and the system boots like normal.

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#3 2012-07-24 03:57:47

falconindy
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From: New York, USA
Registered: 2009-10-22
Posts: 4,097
Website

Re: linux 3.5 - lvm boot troubles

Works for me....

Loading /vmlinuz-linux......
Loading /initramfs-linux.img......ready.
:: running early hook [udev]
:: running hook [udev]
:: Triggering uevents...
:: running hook [lvm2]
Activating logical volumes...
  3 logical volume(s) in volume group "VolGroup00" now active
:: performing fsck on '/dev/mapper/VolGroup00-root'
root: clean, 57394/327680 files, 616107/1310720 blocks
:: mounting '/dev/mapper/VolGroup00-root' on real root
:: running cleanup hook [shutdown]
:: running cleanup hook [udev]

Welcome to Arch Linux!

btw the default rootdelay is 10 seconds assuming that udev is present (it's ignored when udev isn't running). You aren't doing yourself any favors by decreasing the root delay.

Last edited by falconindy (2012-07-24 03:58:20)

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#4 2012-07-24 09:31:40

laloch
Member
Registered: 2010-02-04
Posts: 181

Re: linux 3.5 - lvm boot troubles

falconindy wrote:

You aren't doing yourself any favors by decreasing the root delay.

I am. Relevant part of the lvm2 hook:

    # If the lvmwait= parameter has been specified on the command line
    # wait for the device(s) before trying to activate the volume group(s)
    for pvdev in ${lvmwait//,/ }; do
        poll_device ${pvdev} ${rootdelay}
    done

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#5 2012-07-24 11:33:16

falconindy
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From: New York, USA
Registered: 2009-10-22
Posts: 4,097
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Re: linux 3.5 - lvm boot troubles

I'm aware of what the lvm2 hook does. You're still decreasing the delay with no conceivable gain. If the device shows up in 1 second, poll_device returns in 1 second whether the delay is 10 seconds or 10 minutes. If the device doesn't show up for 5 seconds, your decreased delay will cause boot to fail.

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#6 2012-07-24 16:58:32

falconindy
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From: New York, USA
Registered: 2009-10-22
Posts: 4,097
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Re: linux 3.5 - lvm boot troubles

After re-reading the OP I'm convinced you're even misusing the lvmwait parameter. You're meant to add member devices to lvmwait=, not the resultant assembled device (which is waited for by resolve_device in /init).

No idea what's going on here, but without config and/or lsinitcpio -a output from the image, this isn't going to go any further.

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#7 2012-07-24 18:06:44

laloch
Member
Registered: 2010-02-04
Posts: 181

Re: linux 3.5 - lvm boot troubles

See here: https://wiki.archlinux.org/index.php/Mk … #Using_LVM
As for the rootdelay timeout, it even waits for 10 seconds for each volume in the lvmwait array.

edit: @falconindy: You are right. It does not make any sense to poll-wait for the LVM volume and then do the vgchange -a y ... but waiting for physical volumes doesn't work for me either, because they are already there. It's the dm-mod module initialization. It just seems to be too slow.

Last edited by laloch (2012-07-24 20:28:54)

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#8 2012-07-24 21:48:43

laloch
Member
Registered: 2010-02-04
Posts: 181

Re: linux 3.5 - lvm boot troubles

So I modified my lvm2 hook to look like this:

#!/usr/bin/ash

run_hook() {
    local pvdev

    modprobe -q dm-mod >/dev/null 2>&1

    # If the lvmwait= parameter has been specified on the command line
    # wait for the device(s) before trying to activate the volume group(s)
    for pvdev in ${lvmwait//,/ }; do
        poll_device ${pvdev} ${rootdelay}
    done

    msg "Activating logical volumes..."
    lvm pvscan
    [ -d /etc/lvm ] && lvm vgscan

    if [ -n "$quiet" ]; then
      lvm vgchange --sysinit -a y >/dev/null
    else
      lvm vgchange --sysinit -a y
    fi
}

which seems to be better solution

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#9 2012-08-11 08:34:41

Liuuutas
Member
From: Cambridge
Registered: 2009-05-02
Posts: 71

Re: linux 3.5 - lvm boot troubles

laloch wrote:

So I modified my lvm2 hook to look like this:

    msg "Activating logical volumes..."
+    lvm pvscan
    [ -d /etc/lvm ] && lvm vgscan

which seems to be better solution

Has anybody reported upstream, that there is a problem and that the problem can be solved by inserting one line as shown above?

I can also confirm, that there is the very same problem on my machine and recent updates did not solve it.

Cheers,
Ignas

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#10 2012-08-13 10:22:30

bibaheu
Member
Registered: 2012-08-13
Posts: 1

Re: linux 3.5 - lvm boot troubles

Same problem here. I tried to downgrade the kernel from [core], but it didn't work.

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#11 2012-08-28 13:58:26

Bevan
Member
Registered: 2009-09-08
Posts: 45

Re: linux 3.5 - lvm boot troubles

I ran into the same problem as linux 3.5 now is in [core].
For me using lvmwait=/dev/sdXX did the job (sdXX is the partition which acts as LVM physical volume).

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#12 2012-08-28 18:28:56

jrussell
Member
From: Cape Town, South Africa
Registered: 2012-08-16
Posts: 510

Re: linux 3.5 - lvm boot troubles

Same problem just now after updating to linux 3.5.3-1. I added lvmwait=/dev/mapper/<volume group name><logical volume name> from https://wiki.archlinux.org/index.php/Mk … #Using_LVM to my /etc/default/grub file under "GRUB_CMDLINE_LINUX_DEFAULT", run grub-mkconfig and I now have no problem. Without it, my system sometimes boots, sometimes doesnt -  with the error "No volume groups found".

What is the best or permanent solution? my boots are now a little slower, with a blank pause after the grub menu


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#13 2012-08-28 20:47:49

wop138
Member
Registered: 2012-08-28
Posts: 1

Re: linux 3.5 - lvm boot troubles

Same problem after updating to linux 3.5.3-1.
Utilizing the lvmwait temporary workaround.

lsinitcpio output:


==> Image: /boot/initramfs-linux.img
==> Created with mkinitcpio 0.10
==> Kernel: 3.5.3-1-ARCH
==> Size: 4.25 MiB
==> Compressed with: gzip
  -> Uncompressed size: 11.73 MiB (.362 ratio)
  -> Estimated extraction time: 0.112s

==> Included modules:
  ahci                    hid-elecom              hid-roccat              i2c-algo-bit
  button                  hid-emsff               hid-roccat-arvo         i2c-core
  crc16                   hid-ezkey               hid-roccat-common       i915 [explicit]
  dm-log                  hid-gaff                hid-roccat-isku         intel-agp
  dm-mirror               hid-generic             hid-roccat-kone         intel-gtt
  dm-mod                  hid-gyration            hid-roccat-koneplus     jbd2
  dm-region-hash          hid-holtekff            hid-roccat-kovaplus     lcd
  dm-snapshot             hid-hyperv              hid-roccat-pyra         libahci
  drm                     hid-kensington          hid-saitek              libata
  drm_kms_helper          hid-keytouch            hid-samsung             mbcache
  efivars [explicit]      hid-kye                 hid-sjoy                scsi_mod
  ehci-hcd                hid-lcpower             hid-sony                sd_mod
  ext4                    hid-logitech            hid-speedlink           snd
  fb_sys_fops             hid-logitech-dj         hid-sunplus             snd-rawmidi
  ff-memless              hid-magicmouse          hid-tivo                snd-seq-device
  hid                     hid-microsoft           hid-tmff                soundcore
  hid-a4tech              hid-monterey            hid-topseed             syscopyarea
  hid-apple               hid-multitouch          hid-twinhan             sysfillrect
  hid-aureal              hid-ntrig               hid-uclogic             sysimgblt
  hid-axff                hid-ortek               hid-wacom               usb-common
  hid-belkin              hid-petalynx            hid-waltop              usbcore
  hid-cherry              hid-picolcd             hid-wiimote             usbhid
  hid-chicony             hid-pl                  hid-zpff                video
  hid-cypress             hid-primax              hid-zydacron            xhci-hcd
  hid-dr                  hid-prodikeys           hv_vmbus

==> Included binaries:
  blkid           dmsetup         fsck.ext4       lvm             switch_root     udevd
  busybox         fsck            kmod            mount           udevadm

==> Early hook run order:
  udev

==> Hook run order:
  udev
  lvm2
  resume

==> Cleanup hook run order:
  udev

Last edited by wop138 (2012-08-28 21:04:38)

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#14 2012-08-29 01:31:07

dimich
Member
From: Kharkiv, Ukraine
Registered: 2009-11-03
Posts: 35

Re: linux 3.5 - lvm boot troubles

It looks like `lvm pvscan' helps just because it produces short delay before `lvm vgchange'. I guess if /etc/lvm exists on initrd then it also should work because `lvm vgscan' should run and produce a delay, but delay looks like a crutch in this case.
I also tryed to add `udevadm settle' to lvm2 hook and scsi_wait_scan to MODULES in mkinitcpio.conf but both variants don't work.
BTW, current kernel provides devtmpfs enabled by default. Did anybody try to use devtmpfs instead of udev in the initrd?

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#15 2012-08-29 01:40:26

falconindy
Developer
From: New York, USA
Registered: 2009-10-22
Posts: 4,097
Website

Re: linux 3.5 - lvm boot troubles

dimich wrote:

I also tryed to add `udevadm settle' to lvm2 hook

Of course not. Assuming sane hook ordering on your image, the udev hook runs this before the lvm hook runs. Running it again won't do any good because the event queue will already be empty.

dimich wrote:

Did anybody try to use devtmpfs instead of udev in the initrd?

That isn't a "pick one" option. You always have devtmpfs because udev is incapable of creating device nodes these days. Rather, it depends on devtmpfs (the kernel) to handle this. Regardless, lvm isn't really swayed by what udev does beyond creating the underlying block devices. It depends on brute force scanning to find volumes as opposed to the evented model that udev encourages (requires?).

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#16 2012-08-29 19:14:48

mic006fr
Member
Registered: 2012-08-29
Posts: 1

Re: linux 3.5 - lvm boot troubles

I am having the same issue, after upgrading to kernel 3.5.1.

1/ what is the recommended place of lvm2 in the HOOKS array in mkinitcpio.conf ? I have not found any hint in the documentation.
I am currently using:
HOOKS="base udev autodetect pata scsi sata lvm2 filesystems usbinput fsck"

2/ is there an official or at least clean fix for this issue ?

3/ I am quite disappointed that an issue seen 1 month ago in testing has not been solved and is not blocking the release of the new kernel to core.
It means that all people, even the beginners, can be badly impacted. New kernel release shall have been delayed until a fix (temporary or permanent) has been found, no ?

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#17 2012-08-29 23:26:14

cemsbr
Member
From: Brazil
Registered: 2008-05-03
Posts: 98
Website

Re: linux 3.5 - lvm boot troubles

mic006fr wrote:

3/ I am quite disappointed that an issue seen 1 month ago in testing has not been solved and is not blocking the release of the new kernel to core.
It means that all people, even the beginners, can be badly impacted. New kernel release shall have been delayed until a fix (temporary or permanent) has been found, no ?

That's why I also have Ubuntu installed. It is very useful when Arch stops booting. I wish I could trust Arch more than I do. I suggest voting for https://bugs.archlinux.org/index.php?do … k_id=30966

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#18 2012-08-30 01:02:13

falconindy
Developer
From: New York, USA
Registered: 2009-10-22
Posts: 4,097
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Re: linux 3.5 - lvm boot troubles

I suggest doing something more productive than voting on a bug that's clearly a kernel issue if you want this solved.

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#19 2012-08-30 01:36:57

cemsbr
Member
From: Brazil
Registered: 2008-05-03
Posts: 98
Website

Re: linux 3.5 - lvm boot troubles

falconindy wrote:

I suggest doing something more productive than voting on a bug that's clearly a kernel issue if you want this solved.

I do not have anything new to share so far and If I have, I certainly will. Maybe a kernel that doesn't boot moved from testing because it wasn't affecting many people and voting is a way to show that more people are having problems. With more votes, I believe the priority can become higher than "normal", attracting more people to solve the problem quicker. To finish, I'll quote falconindy from the bug report:

falconindy in bug report wrote:

Yes, thanks for reiterating what's already been said multiple times in this bug report. If you have nothing useful to add, there's a vote button you can click.

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#20 2012-08-30 02:22:18

falconindy
Developer
From: New York, USA
Registered: 2009-10-22
Posts: 4,097
Website

Re: linux 3.5 - lvm boot troubles

cemsbr wrote:

Maybe a kernel that doesn't boot moved from testing because it wasn't affecting many people and voting is a way to show that more people are having problems.

Except that it does boot and affects only a fraction of the userbase. Reread the thread if you aren't convinced that people have found ways around this inconvenience.

cemsbr wrote:

To finish, I'll quote falconindy from the bug report:

falconindy in bug report wrote:

Yes, thanks for reiterating what's already been said multiple times in this bug report. If you have nothing useful to add, there's a vote button you can click.

Right. Voting satisfies some invisible need for people to feel heard, and it prevents my inbox from filling up with garbage that I don't need to be reading.

Bisect the changes in drivers/dm in the kernel tree, report it upstream, be an hero.

Last edited by falconindy (2012-08-30 02:25:11)

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#21 2012-08-30 09:12:58

post-factum
Member
From: /ukraine/kyiv
Registered: 2008-09-12
Posts: 82
Website

Re: linux 3.5 - lvm boot troubles

Same problem here. Cannot open encrypted swap over lvm. Work after several reboots.

Last edited by post-factum (2012-08-30 09:13:22)


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#22 2012-09-02 20:37:58

jrussell
Member
From: Cape Town, South Africa
Registered: 2012-08-16
Posts: 510

Re: linux 3.5 - lvm boot troubles

I just formatted and removed grub and Im trying syslinux, I notice when my computer boots now by default I get "Waiting 10 seconds for device /dev/sda1". With grub I never saw that, I have "quiet" off with both bootloaders.

Not sure if this will help anyone


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#23 2012-09-03 19:35:49

blueicefield
Member
Registered: 2011-08-23
Posts: 4

Re: linux 3.5 - lvm boot troubles

I have exactly the same problem. It seems that with this new kernel the detection of my hard drive is slower. That's why the LVM volumes aren't detected.

To solve the problem, I added this option to the kernel line in my grub.cfg file :

lvmwait=/dev/mapper/VolGroup00-root

Since, I haven't any more that problem during the boot.

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#24 2012-09-05 00:43:18

insequent
Member
Registered: 2012-07-10
Posts: 3

Re: linux 3.5 - lvm boot troubles

falconindy wrote:

Except that it does boot and affects only a fraction of the userbase. Reread the thread if you aren't convinced that people have found ways around this inconvenience.

It boots if you like digging through forums for a solution on a different computer. Though people have been saying it sometimes works, I never had such luxury. It failed every time for me, until I added lvmwait. Any bug that breaks the boot cycle post-upgrade should have top priority, I would think. These are the kind of bugs that detract users from wanting to stick with Archlinux.

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#25 2012-09-05 00:49:07

falconindy
Developer
From: New York, USA
Registered: 2009-10-22
Posts: 4,097
Website

Re: linux 3.5 - lvm boot troubles

insequent wrote:

These are the kind of bugs that detract users from wanting to stick with Archlinux.

Upstream bugs are tragic. Perhaps if someone who's affected by it were to report it upstream, it would get fixed faster.

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