Description of problem:
Attempting to backup the root file system using lvm snapshots
gives the following errors.
---
ROOTFSDEV=/dev/VolGroup00/LogVol00
SNAPNAME=LogVol00-snap
SNAPDEV=/dev/VolGroup00/$SNAPNAME
lvcreate -l 100%FREE -s -n $SNAPNAME $ROOTFSDEV
Unable to read from event server.
VolGroup00-LogVol00--snap: event registration failed: Input/output error
VolGroup00/snapshot0: snapshot segment monitoring function failed.
Logical volume "LogVol00-snap" created
---
However the snapshot seems to be created ok and dump/fsck works on it.
Inspection of kernel messages reveals
May 20 23:58:33 HOST kernel: dmeventd[27885]: segfault at 0000000000000090 rip 00000035af20b680 rsp 00000000410730c8 error 4
May 21 00:07:59 HOST kernel: dmeventd[28187]: segfault at 0000000000000090 rip 00000035af20b680 rsp 000000004029c0c8 error 4
Version-Release number of selected component (if applicable):
# uname -a
Linux HOST 2.6.18-128.1.10.el5xen #1 SMP Wed Apr 29 14:24:51 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
# cat /etc/issue
Red Hat Enterprise Linux Server release 5.3 (Tikanga)
Kernel \r on an \m
# ls /lib*/libdevmapper-event-lvm2snapshot.so
/lib64/libdevmapper-event-lvm2snapshot.so
# file /lib*/libdevmapper-event-lvm2snapshot.so
/lib64/libdevmapper-event-lvm2snapshot.so: symbolic link to `libdevmapper-event-lvm2snapshot.so.2.02'
# file /lib64/libdevmapper-event-lvm2snapshot.so.2.02
/lib64/libdevmapper-event-lvm2snapshot.so.2.02: ELF 64-bit LSB shared object, AMD x86-64, version 1 (SYSV), stripped
# rpm -qa |grep mapper
device-mapper-multipath-0.4.7-23.el5_3.4
device-mapper-event-1.02.28-2.el5
device-mapper-1.02.28-2.el5
# rpm -qa |grep lvm
system-config-lvm-1.1.5-1.0.el5
lvm2-2.02.40-6.el5
# yum update
Loaded plugins: rhnplugin, security
Skipping security plugin, no data
Setting up Update Process
No Packages marked for Update
prior to snapshot lvcreate...
# vgdisplay
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 136.50 GB
PE Size 32.00 MB
Total PE 4368
Alloc PE / Size 4286 / 133.94 GB
Free PE / Size 82 / 2.56 GB
VG UUID tcdD4f-OUCJ-Ll40-ddOw-Cvy3-6yGN-9SJ0W1
after snapshot lvcreate... and during dump of it...
# vgdisplay
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 9
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 136.50 GB
PE Size 32.00 MB
Total PE 4368
Alloc PE / Size 4368 / 136.50 GB
Free PE / Size 0 / 0
VG UUID tcdD4f-OUCJ-Ll40-ddOw-Cvy3-6yGN-9SJ0W1
How reproducible:
100%
Steps to Reproduce:
see above
Actual results:
seee above
Expected results:
no error msg
Additional info: