[Bug 1481881] Re: creating LVM snapshot using lvcreate hangs

[Marcus Tomlinson]

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this is still an issue on a maintained version of Ubuntu please let us
know.

** Changed in: apport (Ubuntu)
       Status: New => Incomplete

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Title:
  creating LVM snapshot using lvcreate hangs

Status in apport package in Ubuntu:
  Incomplete

Bug description:
  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 at 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 at 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

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