Problem (?) with LVM snapshots since Feb 12 updates

After the update, I'm seeing some LVM snapshot errors during boot. In context:
:: running hook [udev]
:: Triggering uevents
[ x.xxx ] device-mapper: table: 254:9: snapshot: Snapshot cow pairing for exception table handover failed
[ x.xxx ] device-mapper: table: 254:14: snapshot: Snapshot cow pairing for exception table handover failed
:: running hook [keymap]
:: performing fsck on <root LV>
arch: clean ...
:: mounting '<root LV>' on real root
:: running cleanup hook [shutdown]
:: running cleanup hook [lvm]
:: running cleanup hook [udev]
Welcome to Arch Linux!
The number of errors varies between zero and three, the latter being the number of snapshots I have.
The corresponding info in the journal is:
Feb 15 09:29:17 caddywhompus kernel: device-mapper: table: 254:9: snapshot: Snapshot cow pairing for exception table handover failed
Feb 15 09:29:17 caddywhompus kernel: device-mapper: ioctl: error adding target to table
Feb 15 09:29:17 caddywhompus kernel: device-mapper: table: 254:14: snapshot: Snapshot cow pairing for exception table handover failed
Feb 15 09:29:17 caddywhompus kernel: device-mapper: ioctl: error adding target to table
Since the errors seem to occur during initramfs, here's some info on that:
# cat /etc/mkinitcpio.conf
MODULES="nouveau ext4"
BINARIES=""
FILES=""
HOOKS="base udev autodetect block keymap lvm2 keyboard fsck shutdown"
COMPRESSION="xz"
COMPRESSION_OPTIONS="-e -9"
# lsinitcpio -a /boot/caddywhompus.img
==> Image: /boot/caddywhompus.img
==> Created with mkinitcpio 0.13.0
==> Kernel: 3.7.7-1-ARCH
==> Size: 3.29 MiB
==> Compressed with: xz
-> Uncompressed size: 12.37 MiB (.265 ratio)
-> Estimated extraction time: 0.402s
==> Included modules:
ahci dm-mirror ehci-hcd libahci pata_marvell usb-common
ata_generic dm-mod ext4 [explicit] libata scsi_mod usbcore
button dm-region-hash hid mbcache sd_mod usbhid
cdrom dm-snapshot i2c-algo-bit mxm-wmi sr_mod usb-storage
crc16 drm i2c-core nouveau [explicit] ttm video
dm-log drm_kms_helper jbd2 pata_acpi uhci-hcd wmi
==> Included binaries:
blkid cp findmnt fsck.ext4 lsblk lvmetad switch_root udevd
busybox dmsetup fsck kmod lvm mount udevadm
==> Early hook run order:
udev
lvm2
==> Hook run order:
udev
keymap
==> Cleanup hook run order:
shutdown
lvm2
udev
Initially I missed the news to enable lvm-monitoring.service. I have since enabled the service, rebooted to another install of Arch which doesn't use LVM (all lvs are prevented from being activated with empty auto_activation_volume_list), and deleted and recreated the snapshots in case they had gotten borked. FWIW, the SSs now only exist for the purpose of troubleshooting this issue, so I'm not worried about their integrity.
I've done numerous boots and seen instances where both lvm-monitoring.service and dmeventd.service start, where both fail, and where one starts but the other fails. This doesn't seem to correspond with the occurence of the errors during boot. On my most recent boot both failed:
# systemctl status lvm-monitoring.service dmeventd.service
lvm-monitoring.service - Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling
Loaded: loaded (/usr/lib/systemd/system/lvm-monitoring.service; enabled)
Active: failed (Result: exit-code) since Fri 2013-02-15 09:49:25 EST; 2min 10s ago
Docs: man:dmeventd(8)
man:lvcreate(8)
man:lvchange(8)
man:vgchange(8)
Process: 237 ExecStart=/usr/sbin/lvm vgchange --monitor y (code=exited, status=5)
Feb 15 09:49:18 caddywhompus lvm[237]: 2 logical volume(s) in volume group "VG1" monitored
Feb 15 09:49:25 caddywhompus lvm[237]: No input from event server.
Feb 15 09:49:25 caddywhompus lvm[237]: VG0-ss_var: event registration failed: Input/output error
Feb 15 09:49:25 caddywhompus lvm[237]: VG0/snapshot1: snapshot segment monitoring function failed.
Feb 15 09:49:25 caddywhompus lvm[237]: 8 logical volume(s) in volume group "VG0" monitored
Feb 15 09:49:25 caddywhompus systemd[1]: lvm-monitoring.service: main process exited, code=exited, status=5/NOTINSSTALLED
Feb 15 09:49:25 caddywhompus systemd[1]: Failed to start Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling.
Feb 15 09:49:25 caddywhompus systemd[1]: Unit lvm-monitoring.service entered failed state
Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable.
dmeventd.service - Device-mapper event daemon
Loaded: loaded (/usr/lib/systemd/system/dmeventd.service; static)
Active: failed (Result: core-dump) since Fri 2013-02-15 09:49:35 EST; 2min 0s ago
Docs: man:dmeventd(8)
Process: 469 ExecStart=/usr/sbin/dmeventd (code=exited, status=0/SUCCESS)
Main PID: 470 (code=dumped, signal=SEGV)
CGroup: name=systemd:/system/dmeventd.service
Feb 15 09:49:25 caddywhompus systemd[1]: Starting Device-mapper event daemon...
Feb 15 09:49:25 caddywhompus dmeventd[470]: dmeventd ready for processing.
Feb 15 09:49:25 caddywhompus systemd[1]: Started Device-mapper event daemon.
Feb 15 09:49:25 caddywhompus lvm[470]: Monitoring snapshot VG0-ss_var
Feb 15 09:49:25 caddywhompus lvm[470]: Monitoring snapshot VG0-ss_root
Feb 15 09:49:25 caddywhompus lvm[470]: Monitoring snapshot VG0-ss_home
Feb 15 09:49:35 caddywhompus systemd[1]: dmeventd.service: main process exited, code=dumped, status=11/SEGV
Feb 15 09:49:35 caddywhompus systemd-coredump[676]: Process 470 (dmeventd) dumped core.
Feb 15 09:49:35 caddywhompus systemd[1]: Unit dmeventd.service entered failed state
But in all cases, lvdisplay seems to indicate that the snapshots are working fine:
# lvdisplay VG0/ss_root VG0/ss_var VG0/ss_home
--- Logical volume ---
LV Path /dev/VG0/ss_root
LV Name ss_root
VG Name VG0
LV UUID jQo9aS-392r-VEX4-36ra-LNS8-BfIJ-0d8NyL
LV Write Access read/write
LV Creation host, time recover, 2013-02-14 17:37:31 -0500
LV snapshot status active destination for lv_root
LV Status available
# open 0
LV Size 5.00 GiB
Current LE 1280
COW-table size 5.00 GiB
COW-table LE 1280
Allocated to snapshot 0.01%
Snapshot chunk size 4.00 KiB
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:5
--- Logical volume ---
LV Path /dev/VG0/ss_var
LV Name ss_var
VG Name VG0
LV UUID SPEFKY-nOYY-3B2L-GpAq-3eSe-aLtY-jlGLQJ
LV Write Access read/write
LV Creation host, time recover, 2013-02-14 17:37:32 -0500
LV snapshot status active destination for lv_var
LV Status available
# open 0
LV Size 5.71 GiB
Current LE 1462
COW-table size 5.71 GiB
COW-table LE 1462
Allocated to snapshot 0.51%
Snapshot chunk size 4.00 KiB
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:14
--- Logical volume ---
LV Path /dev/VG0/ss_home
LV Name ss_home
VG Name VG0
LV UUID MzJVwN-i49J-1nto-6UM4-bq0P-6jD9-F21ok2
LV Write Access read/write
LV Creation host, time recover, 2013-02-14 17:37:32 -0500
LV snapshot status active destination for lv_home
LV Status available
# open 0
LV Size 10.00 GiB
Current LE 2560
COW-table size 10.00 GiB
COW-table LE 2560
Allocated to snapshot 0.25%
Snapshot chunk size 4.00 KiB
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:7
I made the suggested change to global_filter in lvm.conf, though I never had any problems booting; I just saw the occasional warning about fd0 and/or cdrom when running lvscan after boot, and figured it couldn't hurt.
And... I have no idea where to go from here.

Hi,
I've had the same problem for a few months now and the computer has been rebooted many times. This time an endpoint engine has been updated so requires a reboot.
I've rebooted now and still don't see any updates for this windows 8 machines. On some of the W8 machines I have seen working, the updates don't appear in software centre, but when I go to view updates in programs and features, they do
appear there which is also a bit strange.
All the windows 7 machines work fine.
Jaz

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Problem with "SELECT...FOR UPDATE OF..." and "POST command" combination
Problem in committing transactions in Multiple Forms (Oracle Forms) with POST built-in command:
Consider that the following statements are written in WHEN-WINDOW-CLOSED trigger of a called form.
Statements in called form (Form name: FORM_CHILD):
go_block('display_block') ;
do_key('execute_query') ;
-- Data from table_b will be populated in this block, based on the value of COLUMN_1 obtained
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CALLING FORM 1
Statements in KEY-COMMIT trigger:
post;
call_form(form_child, no_activate) ;
Statements in ON-INSERT trigger:
select column_1
from table_a
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update table_a
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where column_2 = 'X' ;
insert into table_b ...;
insert into table_b ...; Statements in KEY-COMMIT trigger:
post;
call_form(form_child, no_activate) ;
CALLING FORM 2:
Statements in ON-INSERT trigger:
select column_1
from table_a
for update of column_1
where column_2 = 'X' ;
update table_a
set column_1 = column_1 + 1
where column_2 = 'X' ;
insert into table_b ...;
insert into table_b ...;
insert into table_b ...;
Our understanding:
Assume that both the forms are running from two different machines/instances, issuing commit at the same time. In this case, forms will start executing the statements written in ON-INSERT trigger, the moment POST command is executed. Though the commit is issued at the same time, according to oracle, only one of the request will be taken for processing first. Assume that calling form 1 is getting processed first.
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Kindly suggest us as to how to fix above problem. It will be much use, if you can send us the information regarding the behavior of Oracle Forms POST built-in also.
Our mail ID: [email protected]
Thanks a lot in advance.

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Problem (?) with LVM snapshots since Feb 12 updates

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