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[Launchpad Bug Tracker <1539349@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.4.0-4.19

---------------
linux (4.4.0-4.19) xenial; urgency=low

  * update ZFS and SPL to 0.6.5.4 (LP: #1542296)
    - [Config] update spl/zfs version
    - SAUCE: (noup) Update spl to 0.6.5.4-0ubuntu2, zfs to 0.6.5.4-0ubuntu1
    - [Config] reconstruct -- drop links for zfs userspace components
    - [Config] reconstruct -- drop links for zfs userspace components -- restore spec links

  * recvmsg() fails SCM_CREDENTIALS request with EOPNOTSUPP. (LP: #1540731)
    - Revert "af_unix: Revert 'lock_interruptible' in stream receive code"

  * lxc: ADT exercise test failing with linux-4.4.0-3.17  (LP: #1542049)
    - Revert "UBUNTU: SAUCE: apparmor: fix sleep from invalid context"

  * WARNING: at /build/linux-lts-wily-W0lTWH/linux-lts-wily-4.2.0/net/core/skbuff.c:4174 (Travis IB) (LP: #1541326)
    - SAUCE: IB/IPoIB: Do not set skb truesize since using one linearskb

  * backport Microsoft Precision Touchpad palm rejection patch (LP: #1541671)
    - HID: multitouch: enable palm rejection if device implements confidence usage

  * [Ubuntu 16.04] Update qla2xxx driver for POWER (QLogic) (LP: #1541456)
    - qla2xxx: Remove unavailable firmware files
    - qla2xxx: Enable Extended Logins support
    - qla2xxx: Enable Exchange offload support.
    - qla2xxx: Enable Target counters in DebugFS.
    - qla2xxx: Add FW resource count in DebugFS.
    - qla2xxx: Added interface to send explicit LOGO.
    - qla2xxx: Delete session if initiator is gone from FW
    - qla2xxx: Wait for all conflicts before ack'ing PLOGI
    - qla2xxx: Replace QLA_TGT_STATE_ABORTED with a bit.
    - qla2xxx: Remove dependency on hardware_lock to reduce lock contention.
    - qla2xxx: Add irq affinity notification
    - qla2xxx: Add selective command queuing
    - qla2xxx: Move atioq to a different lock to reduce lock contention
    - qla2xxx: Disable ZIO at start time.
    - qla2xxx: Set all queues to 4k
    - qla2xxx: Check for online flag instead of active reset when transmitting responses
    - scsi: qla2xxxx: avoid type mismatch in comparison

  * [Hyper-V] PCI Passthrough (LP: #1541120)
    - x86/irq: Export functions to allow MSI domains in modules
    - genirq/msi: Export functions to allow MSI domains in modules

  * Update lpfc driver to 11.0.0.10 (LP: #1541592)
    - lpfc: Fix FCF Infinite loop in lpfc_sli4_fcf_rr_next_index_get.
    - lpfc: Fix the FLOGI discovery logic to comply with T11 standards
    - lpfc: Fix RegLogin failed error seen on Lancer FC during port bounce
    - lpfc: Fix driver crash when module parameter lpfc_fcp_io_channel set to 16
    - lpfc: Fix crash in fcp command completion path.
    - lpfc: Modularize and cleanup FDMI code in driver
    - lpfc: Fix RDP Speed reporting.
    - lpfc: Fix RDP ACC being too long.
    - lpfc: Make write check error processing more resilient
    - lpfc: Use new FDMI speed definitions for 10G, 25G and 40G FCoE.
    - lpfc: Fix mbox reuse in PLOGI completion
    - lpfc: Fix external loopback failure.
    - lpfc: Add logging for misconfigured optics.
    - lpfc: Delete unnecessary checks before the function call "mempool_destroy"
    - lpfc: Use kzalloc instead of kmalloc
    - lpfc: Update version to 11.0.0.10 for upstream patch set

  * Miscellaneous Ubuntu changes
    - [Config] CONFIG_ARM64_VA_BITS=48
    - [Config] Fixed Vcs-Git

  * Miscellaneous upstream changes
    - cxl: Fix possible idr warning when contexts are released
    - cxl: use correct operator when writing pcie config space values
    - cxlflash: drop unlikely before IS_ERR_OR_NULL
    - cxl: Fix DSI misses when the context owning task exits
    - cxlflash: Removed driver date print
    - cxlflash: Fix to resolve cmd leak after host reset
    - cxlflash: Resolve oops in wait_port_offline
    - cxlflash: Enable device id for future IBM CXL adapter
    - cxl: fix build for GCC 4.6.x
    - cxl: use -Werror only with CONFIG_PPC_WERROR
    - cxl: Enable PCI device ID for future IBM CXL adapter

 -- Andy Whitcroft <apw@xxxxxxxxxxxxx>  Fri, 05 Feb 2016 14:58:51 +0000

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

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https://bugs.launchpad.net/bugs/1539349

Title:
  sleep from invalid context in aa_move_mount

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

Bug description:
  In xenial master-next, when I cp /bin/mount /home/ubuntu/mount, define
  the following policy:

  #include <tunables/global>
  /home/ubuntu/mount {
    #include <abstractions/base>
    #include <abstractions/nameservice>

    capability,
    network,
    mount,
    /** mkrwixr,
  }

  And then run the following script under sudo from ~/ubuntu:

  #!/bin/sh

  apparmor_parser -r /home/ubuntu/mount.aa
  umount -l a/b
  umount -l a/a
  umount -l a
  rm -rf a
  mkdir a
  mount --bind a a
  mount --make-slave a
  mkdir a/a a/b
  mount -t tmpfs tmpfs a/a
  /home/ubuntu/mount --move a/a a/b

  I get the following kernel warning:

  Jan 29 02:36:06 seth kernel: audit: type=1400 audit(1454034966.022:15): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/home/ubuntu/mount" pid=1179 comm="apparmor_parser"
  Jan 29 02:36:06 seth kernel: BUG: sleeping function called from invalid context at mm/slub.c:1287
  Jan 29 02:36:06 seth kernel: in_atomic(): 1, irqs_disabled(): 0, pid: 1189, name: mount
  Jan 29 02:36:06 seth kernel: no locks held by mount/1189.
  Jan 29 02:36:06 seth kernel: CPU: 0 PID: 1189 Comm: mount Not tainted 4.4.0+ #4
  Jan 29 02:36:06 seth kernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
  Jan 29 02:36:06 seth kernel:  0000000000000000 00000000a02414bf ffff88007784fc28 ffffffff81449309
  Jan 29 02:36:06 seth kernel:  ffff880079129580 ffff88007784fc50 ffffffff810b5789 ffffffff81ce0e60
  Jan 29 02:36:06 seth kernel:  0000000000000507 0000000000000000 ffff88007784fc78 ffffffff810b5889
  Jan 29 02:36:06 seth kernel: Call Trace:
  Jan 29 02:36:06 seth kernel:  [<ffffffff81449309>] dump_stack+0x4b/0x72
  Jan 29 02:36:06 seth kernel:  [<ffffffff810b5789>] ___might_sleep+0x179/0x230
  Jan 29 02:36:06 seth kernel:  [<ffffffff810b5889>] __might_sleep+0x49/0x80
  Jan 29 02:36:06 seth kernel:  [<ffffffff81258814>] ? getname_kernel+0x34/0x120
  Jan 29 02:36:06 seth kernel:  [<ffffffff81221fcb>] kmem_cache_alloc+0x1db/0x2a0
  Jan 29 02:36:06 seth kernel:  [<ffffffff81258814>] getname_kernel+0x34/0x120
  Jan 29 02:36:06 seth kernel:  [<ffffffff81258e96>] kern_path+0x16/0x30
  Jan 29 02:36:06 seth kernel:  [<ffffffff813e98ac>] aa_move_mount+0x17c/0x320
  Jan 29 02:36:06 seth kernel:  [<ffffffff813df7a3>] apparmor_sb_mount+0x233/0x2d0
  Jan 29 02:36:06 seth kernel:  [<ffffffff81392be7>] security_sb_mount+0x57/0x80
  Jan 29 02:36:06 seth kernel:  [<ffffffff8126f581>] do_mount+0xb1/0xe60
  Jan 29 02:36:06 seth kernel:  [<ffffffff811f0416>] ? __might_fault+0x96/0xa0
  Jan 29 02:36:06 seth kernel:  [<ffffffff811deae3>] ? memdup_user+0x53/0x80
  Jan 29 02:36:06 seth kernel:  [<ffffffff8127066f>] SyS_mount+0x9f/0x100
  Jan 29 02:36:06 seth kernel:  [<ffffffff818d0af6>] entry_SYSCALL_64_fastpath+0x16/0x76

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