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[Launchpad Bug Tracker <1415340@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: lvm2 (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1415340

Title:
  lvconvert segmentation fault on merge

Status in lvm2 package in Ubuntu:
  Confirmed

Bug description:
  1: System information

  root@saturn:~# lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  2: Package information

  root@saturn:~# apt-cache policy lvm2
  lvm2:
    Installed: 2.02.98-6ubuntu2
    Candidate: 2.02.98-6ubuntu2
    Version table:
   *** 2.02.98-6ubuntu2 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status
  root@saturn:~# 

  3. Expected behavior:
   lvconvert --merge should not segfault after merge is successful.

  4. Actual behavior:
  root@saturn:~# mount /dev/saturn/rings.two /mnt
  root@saturn:~# touch /mnt/foo
  root@saturn:~# umount /mnt
  root@saturn:~# valgrind lvconvert --merge /dev/saturn/rings.two
  ==23772== Memcheck, a memory error detector
  ==23772== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
  ==23772== Using Valgrind-3.10.0.SVN and LibVEX; rerun with -h for copyright info
  ==23772== Command: lvconvert --merge /dev/saturn/rings.two
  ==23772== 
  ==23772== Warning: invalid file descriptor 1024 in syscall close()
  ==23772== Warning: invalid file descriptor 1025 in syscall close()
  ==23772== Warning: invalid file descriptor 1026 in syscall close()
  ==23772== Warning: invalid file descriptor 1027 in syscall close()
  ==23772==    Use --log-fd=<number> to select an alternative log fd.
  ==23772== Warning: invalid file descriptor 1028 in syscall close()
  ==23772== Warning: invalid file descriptor 1029 in syscall close()
  ==23772== Warning: invalid file descriptor 1030 in syscall close()
    Merging of volume rings.two started.
    Internal error: Reserved memory (126324736) not enough: used 126881792. Increase activation/reserved_memory?
    rings: Merged: 97.0%
  ==23772== Invalid read of size 8
  ==23772==    at 0x481A79: lv_is_merging_cow (in /sbin/lvm)
  ==23772==    by 0x4997DD: dev_manager_snapshot_percent (in /sbin/lvm)
  ==23772==    by 0x43AF2B: lv_snapshot_percent (in /sbin/lvm)
  ==23772==    by 0x417110: ??? (in /sbin/lvm)
  ==23772==    by 0x427C3F: ??? (in /sbin/lvm)
  ==23772==    by 0x4281BC: poll_daemon (in /sbin/lvm)
  ==23772==    by 0x41853B: lvconvert_poll (in /sbin/lvm)
  ==23772==    by 0x41862A: ??? (in /sbin/lvm)
  ==23772==    by 0x41A9D2: ??? (in /sbin/lvm)
  ==23772==    by 0x42EF21: process_each_lv_in_vg (in /sbin/lvm)
  ==23772==    by 0x4304B4: process_each_lv (in /sbin/lvm)
  ==23772==    by 0x41B3DC: lvconvert (in /sbin/lvm)
  ==23772==  Address 0x28 is not stack'd, malloc'd or (recently) free'd
  ==23772== 
  ==23772== 
  ==23772== Process terminating with default action of signal 11 (SIGSEGV): dumping core
  ==23772==  Access not within mapped region at address 0x28
  ==23772==    at 0x481A79: lv_is_merging_cow (in /sbin/lvm)
  ==23772==    by 0x4997DD: dev_manager_snapshot_percent (in /sbin/lvm)
  ==23772==    by 0x43AF2B: lv_snapshot_percent (in /sbin/lvm)
  ==23772==    by 0x417110: ??? (in /sbin/lvm)
  ==23772==    by 0x427C3F: ??? (in /sbin/lvm)
  ==23772==    by 0x4281BC: poll_daemon (in /sbin/lvm)
  ==23772==    by 0x41853B: lvconvert_poll (in /sbin/lvm)
  ==23772==    by 0x41862A: ??? (in /sbin/lvm)
  ==23772==    by 0x41A9D2: ??? (in /sbin/lvm)
  ==23772==    by 0x42EF21: process_each_lv_in_vg (in /sbin/lvm)
  ==23772==    by 0x4304B4: process_each_lv (in /sbin/lvm)
  ==23772==    by 0x41B3DC: lvconvert (in /sbin/lvm)
  ==23772==  If you believe this happened as a result of a stack
  ==23772==  overflow in your program's main thread (unlikely but
  ==23772==  possible), you can try to increase the size of the
  ==23772==  main thread stack using the --main-stacksize= flag.
  ==23772==  The main thread stack size used in this run was 8388608.
  ==23772== 
  ==23772== HEAP SUMMARY:
  ==23772==     in use at exit: 586,786 bytes in 712 blocks
  ==23772==   total heap usage: 9,622 allocs, 8,910 frees, 19,027,414 bytes allocated
  ==23772== 
  ==23772== LEAK SUMMARY:
  ==23772==    definitely lost: 0 bytes in 0 blocks
  ==23772==    indirectly lost: 0 bytes in 0 blocks
  ==23772==      possibly lost: 0 bytes in 0 blocks
  ==23772==    still reachable: 586,786 bytes in 712 blocks
  ==23772==         suppressed: 0 bytes in 0 blocks
  ==23772== Rerun with --leak-check=full to see details of leaked memory
  ==23772== 
  ==23772== For counts of detected and suppressed errors, rerun with: -v
  ==23772== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
  Segmentation fault (core dumped)

  Merge was successful:

  root@saturn:~# mount /dev/saturn/rings /mnt
  root@saturn:~# ls /mnt -la
  total 17
  drwxr-xr-x  3 root root  1024 Jan 28 00:01 .
  drwxr-xr-x 22 root root  4096 Jan 17 06:36 ..
  -rw-r--r--  1 root root     0 Jan 28 00:01 foo
  drwx------  2 root root 12288 Jan 28 00:00 lost+found


  Replication steps (For me, anyways):

  1) Create empty lv (lv0)
  2) create snapshot of lv (lv1)
  3) Create filesystem on lv0
  4) Create snapshot of lv0 (lv2)
  5) mount lv2 and use touch to create a file
  6) unmount lv2
  7) lvconvert --merge /dev/vol00/lv2

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