[Bug 1767896] Re: Live images with broken seed causes snapd high CPU usage and periodic short GUI freezes

[William D Waddington]

Yes, this is with the 18.10 final release.

I'm unable to provide confirmation/diagnostics as the behavior is worse
than with 18.04/04.1.  With persistence enabled I can sometimes
initially get to a desktop which has a moving mouse pointer but is
unresponsive. It will at some point black-screen with a message about
the Snappy daemon - which I wasn't able to capture.

Subsequent attempts to boot will either hang on the Ubuntu splash
indefinitely, or eventually flash a desktop immediately followed by a
black screen with only a flashing cursor.

I can exit that and initiate a shutdown with the three-fingered-salute.
That brings a message about a stop job for the Snappy daemon, which also
hangs for a very long time.

Sorry I can't provide any further information.  I'm handcuffed ... and
frustrated as *bleep*.

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https://bugs.launchpad.net/bugs/1767896

Title:
  Live images with broken seed causes snapd high CPU usage and periodic
  short GUI freezes

Status in OEM Priority Project:
  Fix Released
Status in snapd package in Ubuntu:
  New
Status in ubuntu-meta package in Ubuntu:
  Fix Released

Bug description:
  ThinkPad 25, UEFI mode, Ubuntu 18.04 installed as a _live_ distro in
  FAT32 partition on SATA SSD in WWAN slot.

  Grub options allow booting without persistence or with a 256MB
  persistence file.  Only thing "persisted" is TERM in favorites.

  Without persistence all is well. With persistence snapd uses up to 90%
  CPU - perhaps more - and cripples the system. Fan runs nearly full
  speed constantly.

  I can eliminate the problem by removing snapd - and that persists.
  Can't kill snapd.  PID is constantly changing.

  0% fan  and low CPU use at idle w/out snapd with persistence, or
  booted w/out persistence.

  WORKAROUND:
  sudo systemctl stop snapd

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