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[Launchpad Bug Tracker <1588056@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.4.0-31.50

---------------
linux (4.4.0-31.50) xenial; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1602449

  * nouveau: boot hangs at blank screen with unsupported graphics cards
    (LP: #1602340)
    - SAUCE: drm: check for supported chipset before booting fbdev off the hw

linux (4.4.0-30.49) xenial; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1597897

  * FCP devices are not detected correctly nor deterministically (LP: #1567602)
    - scsi_dh_alua: Disable ALUA handling for non-disk devices
    - scsi_dh_alua: Use vpd_pg83 information
    - scsi_dh_alua: improved logging
    - scsi_dh_alua: sanitze sense code handling
    - scsi_dh_alua: use standard logging functions
    - scsi_dh_alua: return standard SCSI return codes in submit_rtpg
    - scsi_dh_alua: fixup description of stpg_endio()
    - scsi_dh_alua: use flag for RTPG extended header
    - scsi_dh_alua: use unaligned access macros
    - scsi_dh_alua: rework alua_check_tpgs() to return the tpgs mode
    - scsi_dh_alua: simplify sense code handling
    - scsi: Add scsi_vpd_lun_id()
    - scsi: Add scsi_vpd_tpg_id()
    - scsi_dh_alua: use scsi_vpd_tpg_id()
    - scsi_dh_alua: Remove stale variables
    - scsi_dh_alua: Pass buffer as function argument
    - scsi_dh_alua: separate out alua_stpg()
    - scsi_dh_alua: Make stpg synchronous
    - scsi_dh_alua: call alua_rtpg() if stpg fails
    - scsi_dh_alua: switch to scsi_execute_req_flags()
    - scsi_dh_alua: allocate RTPG buffer separately
    - scsi_dh_alua: Use separate alua_port_group structure
    - scsi_dh_alua: use unique device id
    - scsi_dh_alua: simplify alua_initialize()
    - revert commit a8e5a2d593cb ("[SCSI] scsi_dh_alua: ALUA handler attach should
      succeed while TPG is transitioning")
    - scsi_dh_alua: move optimize_stpg evaluation
    - scsi_dh_alua: remove 'rel_port' from alua_dh_data structure
    - scsi_dh_alua: Use workqueue for RTPG
    - scsi_dh_alua: Allow workqueue to run synchronously
    - scsi_dh_alua: Add new blacklist flag 'BLIST_SYNC_ALUA'
    - scsi_dh_alua: Recheck state on unit attention
    - scsi_dh_alua: update all port states
    - scsi_dh_alua: Send TEST UNIT READY to poll for transitioning
    - scsi_dh_alua: do not fail for unknown VPD identification

linux (4.4.0-29.48) xenial; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1597015

  * Wireless hotkey fails on Dell XPS 15 9550 (LP: #1589886)
    - intel-hid: new hid event driver for hotkeys
    - intel-hid: fix incorrect entries in intel_hid_keymap
    - intel-hid: allocate correct amount of memory for private struct
    - intel-hid: add a workaround to ignore an event after waking up from S4.
    - [Config] CONFIG_INTEL_HID_EVENT=m

  * cgroupfs mounts can hang (LP: #1588056)
    - Revert "UBUNTU: SAUCE: (namespace) mqueue: Super blocks must be owned by the
      user ns which owns the ipc ns"
    - Revert "UBUNTU: SAUCE: kernfs: Do not match superblock in another user
      namespace when mounting"
    - Revert "UBUNTU: SAUCE: cgroup: Use a new super block when mounting in a
      cgroup namespace"
    - (namespace) bpf: Use mount_nodev not mount_ns to mount the bpf filesystem
    - (namespace) bpf, inode: disallow userns mounts
    - (namespace) ipc: Initialize ipc_namespace->user_ns early.
    - (namespace) vfs: Pass data, ns, and ns->userns to mount_ns
    - SAUCE: (namespace) Sync with upstream s_user_ns patches
    - (namespace) kernfs: The cgroup filesystem also benefits from SB_I_NOEXEC
    - (namespace) ipc/mqueue: The mqueue filesystem should never contain
      executables

  * KVM system crashes after starting guest (LP: #1596635)
    - xhci: Cleanup only when releasing primary hcd

  * Upstream patch "crypto: vmx - IV size failing on skcipher API" for Ubuntu
    16.04 (LP: #1596557)
    - crypto: vmx - IV size failing on skcipher API

  * [Bug]tpm initialization fails on x86 (LP: #1596469)
    - tpm_crb: drop struct resource res from struct crb_priv
    - tpm_crb: fix mapping of the buffers

  * Device shutdown notification for CAPI Flash cards (LP: #1592114)
    - cxlflash: Fix regression issue with re-ordering patch
    - cxlflash: Fix to drain operations from previous reset
    - cxlflash: Add device dependent flags
    - cxlflash: Shutdown notify support for CXL Flash cards

  * scsi-modules udeb should include pm80xx (LP: #1595628)
    - [Config] Add pm80xx scsi driver to d-i

  * Sync up latest relevant upstream bug fixes (LP: #1594871)
    - SAUCE: (noup) Update zfs to 0.6.5.6-0ubuntu10

  * Cannot compile module tda10071 (LP: #1592531)
    - [media] tda10071: Fix dependency to REGMAP_I2C

  * lsvpd doesn't show correct location code for devices attached to a CAPI card
    (LP: #1594847)
    - cxl: Make vPHB device node match adapter's

  * enable CRC32 and AES ARM64 by default or as module (LP: #1594455)
    - [Config] Enable arm64 AES and CRC32 crypto

  * VMX kernel crypto module exhibits poor performance in Ubuntu 16.04
    (LP: #1592481)
    - crypto: vmx - comply with ABIs that specify vrsave as reserved.
    - crypto: vmx - Fix ABI detection
    - crypto: vmx - Increase priority of aes-cbc cipher

  * build squashfs into xenial kernels by default (LP: #1593134)
    - [Config] CONFIG_SQUASHFS=y

  * Restore irqfd fast path for PPC (LP: #1592809)
    - KVM: PPC: Book3S HV: Re-enable XICS fast path for irqfd-generated interrupts

  * Unable to start guests with memballoon default. (LP: #1592042)
    - virtio_balloon: fix PFN format for virtio-1

  * Key 5 automatically pressed on some Logitech wireless keyboards
    (LP: #1579190)
    - HID: core: prevent out-of-bound readings

  * ZFS: Running ztest repeatedly for long periods of time eventually results in
    "zdb: can't open 'ztest': No such file or directory" (LP: #1587686)
    - Fix ztest truncated cache file

  * STC840.20:Alpine:alp7fp1:Ubuntu 16.04, BlueFin (SAN) EEH 6 times during boot
    then disabled SRC BA188002:b0314a_1612.840 (LP: #1587316)
    - lpfc: Fix DMA faults observed upon plugging loopback connector

 -- Kamal Mostafa <kamal@xxxxxxxxxxxxx>  Tue, 12 Jul 2016 16:28:12 -0700

** Changed in: linux (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1588056

Title:
  cgroupfs mounts can hang

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  SRU Justification

  Impact: In some circumstances mount(2) of cgroup can endlessly return
  ERESTARTNOINTR, causing mount(8) to endlessly spin in loop.

  Fix: Drop sauce patches for making cgroupfs work with s_user_ns in
  favor of patches from linux-next which do not have this problem.

  Regression potential: The changes go beyond simply fixing the bug in
  order to sync up with upstream, but the upstream patches are by and
  large functionally equivalent. One consequence is that the bpf fs will
  no longer be mountable in a user namespace, but this fs is new in 4.4,
  unused as far as I can tell, and broken for user namespace mounts
  anyway.

  ---

  Consider the following,

  root@dev:/tmp# mkdir foo
  root@dev:/tmp# mount -t cgroup -o none,name=foo none foo
  root@dev:/tmp# mkdir -p foo/bad
  root@dev:/tmp# umount -l foo
  root@dev:/tmp# mount -t cgroup -o none,name=foo none foo # hangs forever
  ^C
  root@dev:/tmp# uname -a
  Linux dev 4.4.0-22-generic #40-Ubuntu SMP Thu May 12 22:03:46 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

  When I strace the mount task, I get a whole bunch of,

  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)
  mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ? ERESTARTNOINTR (To be restarted)

  Which I think means that we're looping on,

  https://github.com/torvalds/linux/blob/master/kernel/cgroup.c#L2137

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