creating LVM snapshot using lvcreate hangs

[Animesh]

lvcreate command hangs while taking a snapshot of root file system. Running strace on hang process reports that process is hung doing semop. I am using ubuntu 14.04.

Package used:
Package: lvm2
Version: 2.02.98-6ubuntu2
Architecture: amd64

Kernel:
ubuntu-test:~$ uname -a
Linux ubuntu-test 3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri May 8 09:43:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Command outputs:
test@ubuntu-test:$ sudo lvs
  LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert
  TestVolume TestGroup -wi-ao--- 20.00g
  test_iso_lv test_root_vg -wi-ao--- 3.00g
  test_log_lv test_root_vg -wi-ao--- 2.00g
  test_root_lv test_root_vg owi-aos-- 9.95g
  test_root_lv_before_upgrade test_root_vg swi-a-s-- 9.95g test_root_lv 0.03
  test_swap_lv test_root_vg -wi-ao--- 16.00g

test@ubuntu-test:$ sudo lvdisplay
  --- Logical volume ---
  LV Path /dev/TestGroup/TestVolume
  LV Name TestVolume
  VG Name TestGroup
  LV UUID F3HgjF-Gxjf-V8Yk-GrbO-JfZ7-ByjG-rV8UtP
  LV Write Access read/write
  LV Creation host, time ubuntu, 2015-06-22 20:54:19 +0000
  LV Status available
  # open 1
  LV Size 20.00 GiB
  Current LE 5119
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 252:0

  --- Logical volume ---
  LV Path /dev/test_root_vg/test_root_lv
  LV Name test_root_lv
  VG Name test_root_vg
  LV UUID am2iU8-hYPl-rrot-9HqW-P5O5-bBZf-WNgKNx
  LV Write Access read/write
  LV Creation host, time ubuntu, 2015-06-22 20:54:19 +0000
  LV snapshot status source of
                         test_root_lv_before_upgrade [active]
  LV Status available
  # open 1
  LV Size 9.95 GiB
  Current LE 2548
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 252:1

  --- Logical volume ---
  LV Path /dev/test_root_vg/test_log_lv
  LV Name test_log_lv
  VG Name test_root_vg
  LV UUID S9QDl1-x7ss-ng1N-SL72-T3cA-dkgK-BHlW4W
  LV Write Access read/write
  LV Creation host, time ubuntu, 2015-06-22 20:54:19 +0000
  LV Status available
  # open 1
  LV Size 2.00 GiB
  Current LE 512
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 252:2

  --- Logical volume ---
  LV Path /dev/test_root_vg/test_swap_lv
  LV Name test_swap_lv
  VG Name test_root_vg
  LV UUID 1j508M-L6ZI-pqCd-yPYL-6jtf-Iglj-B5IbDq
  LV Write Access read/write
  LV Creation host, time ubuntu, 2015-06-22 20:54:19 +0000
  LV Status available
  # open 2
  LV Size 16.00 GiB
  Current LE 4096
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 252:3

  --- Logical volume ---
  LV Path /dev/test_root_vg/test_iso_lv
  LV Name test_iso_lv
  VG Name test_root_vg
  LV UUID SYM3KQ-On4R-7iwN-Ozxv-91dc-blay-zb2Xmc
  LV Write Access read/write
  LV Creation host, time ubuntu, 2015-06-22 20:54:20 +0000
  LV Status available
  # open 1
  LV Size 3.00 GiB
  Current LE 768
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 252:4

  --- Logical volume ---
  LV Path /dev/test_root_vg/test_root_lv_before_upgrade
  LV Name test_root_lv_before_upgrade
  VG Name test_root_vg
  LV UUID zzBMia-FP2s-Eh7g-Xlhk-Mc8b-mPfk-ThWb5r
  LV Write Access read/write
  LV Creation host, time ubuntu-test, 2015-06-23 18:52:06 +0000
  LV snapshot status active destination for test_root_lv
  LV Status available
  # open 0
  LV Size 9.95 GiB
  Current LE 2548
  COW-table size 9.95 GiB
  COW-table LE 2548
  Allocated to snapshot 0.03%
  Snapshot chunk size 4.00 KiB
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 252:5

[Marcus Tomlinson (marcustomlinson)]

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