[Bug 2084233] Re: Excluded libaio library from mlock may hang system while removing rootfs snapshot

[Heitor Alves de Siqueira]

** Also affects: lvm2 (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: lvm2 (Ubuntu Noble)
   Importance: Undecided
       Status: New

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

** Changed in: lvm2 (Ubuntu Jammy)
     Assignee: (unassigned) => Heitor Alves de Siqueira (halves)

** Changed in: lvm2 (Ubuntu Noble)
     Assignee: (unassigned) => Heitor Alves de Siqueira (halves)

** Changed in: lvm2 (Ubuntu)
     Assignee: (unassigned) => Heitor Alves de Siqueira (halves)

** Changed in: lvm2 (Ubuntu Jammy)
   Importance: Undecided => Medium

** Changed in: lvm2 (Ubuntu Noble)
   Importance: Undecided => Medium

** Changed in: lvm2 (Ubuntu Jammy)
       Status: New => In Progress

** Changed in: lvm2 (Ubuntu Noble)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/2084233

Title:
  Excluded libaio library from mlock may hang system while removing
  rootfs snapshot

Status in lvm2:
  Fix Released
Status in lvm2 package in Ubuntu:
  Fix Released
Status in lvm2 source package in Jammy:
  In Progress
Status in lvm2 source package in Noble:
  In Progress

Bug description:
  Hi,

  One of our production system hang while executing a custom backup
  script, using LVM snapshots and raw copies in order to build an
  alternative boot environment.

  We opened an issue on the LVM2 Github
  (https://github.com/lvmteam/lvm2/issues/159), and one of the
  contributor advises us to use at least the LVM2 2.03.17 version, built
  with the following patch :
  https://github.com/lvmteam/lvm2/commit/a3eb6ba425773224076c41aabc3c490a6a016ee6

  The libaio library is, on previous versions, excluded of the mlock
  call and it can lead to a full system hang, specifically during a
  rootfs snapshot removal, as removing a shapshot freezes the underlying
  volume and the system won't be able to read on that volume during this
  operation. In rare condtions, this can be harmful if the system
  decides to page-out during this operation.

  As I understand that it may be complicated to upgrade the LVM2 version
  on stable releases of Ubuntu, is it possible to cherry-pick the
  relevant (and really simple/small) patch from the LVM2 2.03.17 version
  on the current LVM2 versions used by Ubuntu ?

  Regards,

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