[rhelv6-list] xfs and xfsconvertd issues

[Derek Yarnell]

Hi,

Has anyone seen the following scenerio.  We have an XFS file system that
seems to be going a bit crazy.  Running a fully patched RHEL 6.2 system
we are running KVM instances with libvirt with a default pool on a XFS
file system.  I destroyed a domain at which point the qemu-kvm process
went into zombie (Z) state.  I tried to restart libvirtd and it also
went into zombie state.

# ps axuww | grep Z
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root     45678  0.1  0.0      0     0 ?        Zl   Feb29   0:58
[libvirtd] <defunct>
qemu     47218  0.6  0.0      0     0 ?        Zl   Feb29   6:19
[qemu-kvm] <defunct>

Now the xfsconvertd processes are all showing up in constant device wait
state (D).  The other KVM vms on the file system seem to be working with
no issue.  We can read and write to the file system other than the raw
disk image that was associated with the destroyed domain.  Any
operations on that file cause the process to go into device wait state (D).

We have mounted the file system as normal XFS with the default options,

# mount | grep xfs
/dev/mapper/vol00-libvirt on /var/lib/libvirt/images type xfs (rw)

I would have submitted a ticket to Red Hat however we are an Academic
subscriber and they decided to wack the very low level support avenue
(Web Help Desk) we had in previous years when they reworked their line
items this year.

Thanks,
derek

# ps axuww | grep xfs
root      1263  0.0  0.0      0     0 ?        S    Feb23   0:00
[xfs_mru_cache]
root      1264  0.0  0.0      0     0 ?        S    Feb23   0:00 [xfslogd/0]
root      1265  0.0  0.0      0     0 ?        S    Feb23   0:00 [xfslogd/1]
root      1266  0.0  0.0      0     0 ?        S    Feb23   0:00 [xfslogd/2]
root      1267  0.0  0.0      0     0 ?        S    Feb23   0:00 [xfslogd/3]
root      1268  0.0  0.0      0     0 ?        S    Feb23   0:00 [xfslogd/4]
root      1269  0.0  0.0      0     0 ?        S    Feb23   0:00 [xfslogd/5]
root      1270  0.0  0.0      0     0 ?        S    Feb23   0:00 [xfslogd/6]
root      1271  0.0  0.0      0     0 ?        S    Feb23   0:00 [xfslogd/7]
root      1272  0.0  0.0      0     0 ?        S    Feb23   0:00 [xfslogd/8]
root      1273  0.0  0.0      0     0 ?        S    Feb23   0:00 [xfslogd/9]
root      1274  0.0  0.0      0     0 ?        S    Feb23   0:00
[xfslogd/10]
root      1275  0.0  0.0      0     0 ?        S    Feb23   0:00
[xfslogd/11]
root      1276  0.0  0.0      0     0 ?        D    Feb23   0:00
[xfsdatad/0]
root      1277  0.0  0.0      0     0 ?        D    Feb23   0:38
[xfsdatad/1]
root      1278  0.0  0.0      0     0 ?        S    Feb23   0:00
[xfsdatad/2]
root      1279  0.0  0.0      0     0 ?        D    Feb23   2:08
[xfsdatad/3]
root      1280  0.0  0.0      0     0 ?        D    Feb23   1:35
[xfsdatad/4]
root      1281  0.0  0.0      0     0 ?        D    Feb23   5:38
[xfsdatad/5]
root      1282  0.0  0.0      0     0 ?        D    Feb23   6:50
[xfsdatad/6]
root      1283  0.0  0.0      0     0 ?        D    Feb23   7:52
[xfsdatad/7]
root      1284  0.0  0.0      0     0 ?        S    Feb23   0:00
[xfsdatad/8]
root      1285  0.0  0.0      0     0 ?        D    Feb23   0:01
[xfsdatad/9]
root      1286  0.0  0.0      0     0 ?        S    Feb23   0:00
[xfsdatad/10]
root      1287  0.0  0.0      0     0 ?        D    Feb23   8:48
[xfsdatad/11]
root      1288  0.7  0.0      0     0 ?        D    Feb23  75:55
[xfsconvertd/0]
root      1289  0.9  0.0      0     0 ?        D    Feb23  87:34
[xfsconvertd/1]
root      1290  0.7  0.0      0     0 ?        D    Feb23  76:46
[xfsconvertd/2]
root      1291  0.7  0.0      0     0 ?        R    Feb23  75:44
[xfsconvertd/3]
root      1292  0.8  0.0      0     0 ?        D    Feb23  83:27
[xfsconvertd/4]
root      1293  0.8  0.0      0     0 ?        D    Feb23  86:06
[xfsconvertd/5]
root      1294  0.8  0.0      0     0 ?        D    Feb23  83:19
[xfsconvertd/6]
root      1295  0.8  0.0      0     0 ?        D    Feb23  82:17
[xfsconvertd/7]
root      1296  0.6  0.0      0     0 ?        D    Feb23  63:55
[xfsconvertd/8]
root      1297  0.0  0.0      0     0 ?        S    Feb23   0:00
[xfsconvertd/9]
root      1298  0.0  0.0      0     0 ?        S    Feb23   0:00
[xfsconvertd/10]
root      1299  0.9  0.0      0     0 ?        D    Feb23  95:45
[xfsconvertd/11]
root      1300  0.0  0.0      0     0 ?        S    Feb23   0:00
[xfsbufd/dm-4]
root      1301  0.0  0.0      0     0 ?        S    Feb23   0:00
[xfssyncd/dm-4]
root      1302  0.0  0.0      0     0 ?        S    Feb23   0:00
[xfsaild/dm-4]

-- 
---
Derek T. Yarnell
University of Maryland
Institute for Advanced Computer Studies