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[Launchpad Bug Tracker <1661265@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package snapd - 2.22.2+17.04

---------------
snapd (2.22.2+17.04) zesty; urgency=medium

  * New upstream release, LP: #1659522
    - cherry pick fix for sched_setscheduler regression
      (LP: #1661265)

snapd (2.22.1) xenial; urgency=medium

  * New upstream release, LP: #1659522
    - cherry pick fix for snapctl auth.json handling

snapd (2.22) xenial; urgency=medium

  * New upstream release, LP: #1659522
    - many: make ubuntu-core-launcher mostly go
    - interfaces/builtin: add account-control interface
    - interfaces/builtin: add missing syscalls to core-support needed
      for systemctl
    - interfaces/builtin: rework core-support to only allow full access
      to systemctl
    - debian/tests: drop stale autopkgtest dependencies.
    - tests: make the debugging of c-unit-tests more useful
    - store: retry auth-related requests
    - tests: integration test for system reload
    - snap: be more helpful in the `snap install <already-installed>`
      error message
    - tests: set SNAPPY_USE_STAGING_STORE in su call
    - tests: use test snap
    - spread: set SNAPD_DEBUG=1 in the core snap as well
    - tests: add extra debugging to security-setuid-root test
    - cmd,snap,wrappers: systemd reload command support
    - interfaces: builtin: mir: Allow recv and send
    - overlord/ifacestate: use ParseConnRef
    - overlord/snapstate,overlord/ifacestate: add automatic ubuntu-core
      -> core transition
    - debian: remove aliases as well in snapd.postrm
    - many: change interfaces.ParseID to return value
    - interfaces/opengl: allow access to the nvidia abstract socket
    - overlord, daemon: flag failures feature fancy forms.
    - many: add --classic support to try and revert, and make missing
      these things a little harder
    - interfaces: allow reading non-PCI-attached usb devices via raw-usb
    - many: rename snap-alter-ns to snap-update-ns
    - interfaces/builtin: add core-support
    - store: increase the retry.LimitTime()
    - debian: move the packaging out into package/$id-$version_id
    - overlord/stapstate: don't use unkeyed fields
    - many: add stub implementation of snap-alter-ns
    - asserts: improve error message when key is not valid at the given
      time
    - snapstate, ifacestate: add snapstate.CheckChangeConflict() to
      ifacestate.{Connect,Disconnect}
    - debian: remove trusty specific bits
    - docs: Add a note about building snapd.
    - interfaces: miscellaneous updates for default and network-control
    - daemon: bubble out store.ErrSnapNotFound in the findOne codepath
    - store: add retry logging into download as well
    - snap: show price in `snap info`
    - cmd: add fault injection support code
    - interfaces: network-manager: allow rw access to /etc/netplan
    - debian: move systemd files out of ./debian and into ./data/systemd
    - asserts: implement SuggestFormat to help avoid specifying the
      wrong format iteration for an assertion
    - many: detect potentially insecure use of snap-confine
    - interfaces: allow querying added security backends
    - cmd: ensure that all .c files have a -test.c file
    - asserts: don't use 'context' for the path of attributes, want to
      reuse the concept for something else
    - interfaces: abbreviate ConnRef construction
    - tests: ensure systemd override directory is available before using
      it
    - cmd: more build system cleanups and a small fix
    - tests: increase retries for service up
    - cmd: move seccomp cleanup function to seccomp-support
    - many: auto-connect plugs and slots symmetrically
    - overlord: use a ticker for the pruning
    - interfaces/builtin: add uhid interface
    - cmd/snap-confine: add shutdown helper
    - tests: fix path used when debugging
    - cmd: switch to non-recursive make
    - overlord/ifacestate: setup security of snaps affected by auto-
      connection
    - spread: refresh apt cache before first install
    - overlord: allow max 500 changes in "ready" state to avoid growing
      changes for 24h
    - snap: add {Plug,Slot}Info.SecurityTags
    - cmd: move snap-discard-ns to dedicated directory
    - tests: skip i18n test when no "snappy.mo" file is available
    - interfaces,overlord/ifacestate: small refactor around reference
      methods
    - tests: remove the snapd dirs last (should fix random test errors)
    - interfaces: mm: permissions for protocol proxies
    - interfaces/builtin: add evolution interfaces
    - many: extract the logging http client and user-agent handling for
      use in devicestate
    - interfaces: unity8-download-manager is the chosen name for this
      interface.
    - tests: add "quiet" wrapper function that only prints output on
      failure
    - tests: fix failing snapd-reexec test
    - docs: simplify HACKING.md that snapd itself supports setting up
      the sockets
    - overlord: flag required-snaps from model as required and prevent
      removing them
    - spread: exclude .o and .a files
    - tests: parameterize remote store
    - cmd: fix hardcoded paths to rst2man and support rst2man.py
    - tests: improve debug output when reexec is used
    - tests: disable ipv6 before unpacking delta
    - interfaces: add new interface API
    - tests: change TRUST_TEST_KEYS to be controlled from the host
    - spread: add boilerplate for Linode delta uploads
    - wrappers: add support for the X-Ayatana-Desktop-Shortcuts=
      extension
    - partition: add support for native grubenv read/write and use it
    - tests: add test ensuring manual pages are shipped

 -- Michael Vogt <michael.vogt@xxxxxxxxxx>  Thu, 02 Feb 2017 17:13:51
+0100

** Changed in: snapd (Ubuntu Zesty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1661265

Title:
  [regression] sched_setscheduler denied with Qt/QML applications

Status in Canonical System Image:
  In Progress
Status in Snappy:
  Fix Committed
Status in snapd package in Ubuntu:
  Fix Released
Status in snapd source package in Trusty:
  Fix Committed
Status in snapd source package in Xenial:
  Fix Committed
Status in snapd source package in Yakkety:
  Fix Committed
Status in snapd source package in Zesty:
  Fix Released

Bug description:
  2.22 added stricter mediation of sched_setscheduler which requires use
  of 'process-control' with certain invocations of sched_setsceduler.
  Testing and code searches for sched_setscheduler showed that this was
  not an issue for most applications and existing snaps, but after 2.22
  was released it was found that qtbase-opensource-src uses
  sched_setscheduler indirectly as part of QThread::Priority, and
  QThread::Priority is used extensively under the hood by the libraries
  to support (at least) QML applications.

  The fix is simple, adjust interfaces/seccomp/template.go from this:
    sched_setscheduler 0 - -

  back to:
    sched_setscheduler

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