[linux-lvm] lvm2 lvmetad hangs with 100% cpu

[Pirate Fibonacci]

A simpler version that demonstrates bug...

thanks...

from lvm2py import *

lvm = LVM()
vg_list_obj  = lvm.vgscan()
target_count = 12
volume_size  = 1
vg_name      = 'vg-targetd'
volume_name  = "test_volume_%s"

for i in range (1,target_count):
  lv_name = volume_name % (str(i).zfill(2))
  vg = lvm.get_vg(vg_name, 'w')
  vg.create_lv(lv_name, volume_size, 'GiB')
  print 'created volume ', lv_name

i = 1
while i < 300:
    vg = lvm.get_vg(vg_name, 'r')
    lv_list_obj = vg.lvscan()
    output = []
    for lv in lv_list_obj:
        output.append(dict(volume_name=lv.name, size=int(lv.size()),
uuid=lv.uuid))
    print output
    print i
    i = i + 1



On Tue, Sep 9, 2014 at 2:40 PM, Pirate Fibonacci <pirate112358 at gmail.com>
wrote:

> All,
>
> I'm using fedora20. fresh install. I start with an empty volume group,
> vg-targetd
>
> I've included some python code that reproduces the hang.
>
> the script creats 11 logical volumes. attaches them to the
> BlockStorageObject from the rtslib. iscsi...
>
> then we go in to a loop calling lvscan() about the 42 iteration, the
> program will hang with lvmetad going 100% cpu
>
> using the lvm lib, I don't have this issue.
>
> thanks
>
> Jeffrey
>
>
>
> #!/usr/bin/python
> from lvm2py import *
> from rtslib import BlockStorageObject
>
> lvm = LVM()
> vg_list_obj  = lvm.vgscan()
> lv_list_obj  = {}
> target_count = 12
> volume_size  = 1
> vg_name      = 'vg-targetd'
> volume_name  = "test_volume_%s"
>
> for i in range (1,target_count):
>   lv_name = volume_name % (str(i).zfill(2))
>   so_name = "%s:%s" % (vg_name, lv_name)
>   vg = lvm.get_vg(vg_name, 'w')
>   vg.create_lv(lv_name, volume_size, 'GiB')
>   storageblock_obj = BlockStorageObject(so_name, dev="/dev/%s/%s" %
> (vg_name, lv_name))
>   print 'created volume ', lv_name
>
> i = 1
> while i < 300:
>     vg = lvm.get_vg(vg_name, 'r')
>     lv_list_obj = vg.lvscan()
>     output = []
>     for lv in lv_list_obj:
>         output.append(dict(volume_name=lv.name, size=int(lv.size()),
> uuid=lv.uuid))
>     print output
>     print i
>     i = i + 1
>
>
> # hangs after 42 iterations with 12 volumes
>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/linux-lvm/attachments/20140909/eb2db0c4/attachment.htm>