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[Kamal Mostafa <kamal@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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

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https://bugs.launchpad.net/bugs/1593874

Title:
  warning stack trace while playing with apparmor namespaces

Status in linux package in Ubuntu:
  Expired
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  I'm not sure what exactly I was doing when this happened, but
  something fairly basic (creating containers, adding/removing
  profiles). Let me know if you need more than the trace and I can try
  and figure out how to reproduce.

  Jun 17 20:20:06 dev kernel: [13314.032676] ------------[ cut here ]------------
  Jun 17 20:20:06 dev kernel: [13314.032689] WARNING: CPU: 3 PID: 8964 at /build/linux-oXTOqc/linux-4.4.0/security/apparmor/label.c:82 __aa_proxy_redirect+0xff/0x130()
  Jun 17 20:20:06 dev kernel: [13314.032692] AppArmor WARN __aa_proxy_redirect: ((!!queued_write_can_lock(&(&(&(((((&((orig)->vec[0])))[(((orig)->size)) - 1])->ns))->labels)->lock)->raw_lock))): 
  Jun 17 20:20:06 dev kernel: [13314.032693] Modules linked in: binfmt_misc veth xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables isofs zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO) spl(O) zavl(PO) ppdev kvm_intel kvm joydev serio_raw irqbypass parport_pc parport ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear psmouse floppy
  Jun 17 20:20:06 dev kernel: [13314.032751] CPU: 3 PID: 8964 Comm: lxd Tainted: P        W  O    4.4.0-24-generic #43-Ubuntu
  Jun 17 20:20:06 dev kernel: [13314.032753] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
  Jun 17 20:20:06 dev kernel: [13314.032756]  0000000000000286 00000000dc104ca4 ffff880044db3d18 ffffffff813eab23
  Jun 17 20:20:06 dev kernel: [13314.032760]  ffff880044db3d60 ffffffff81cec7f0 ffff880044db3d50 ffffffff810810d2
  Jun 17 20:20:06 dev kernel: [13314.032763]  ffff880047f04360 ffff88007a08d360 ffff88004a551b00 ffff88004a551b38
  Jun 17 20:20:06 dev kernel: [13314.032766] Call Trace:
  Jun 17 20:20:06 dev kernel: [13314.032773]  [<ffffffff813eab23>] dump_stack+0x63/0x90
  Jun 17 20:20:06 dev kernel: [13314.032777]  [<ffffffff810810d2>] warn_slowpath_common+0x82/0xc0
  Jun 17 20:20:06 dev kernel: [13314.032780]  [<ffffffff8108116c>] warn_slowpath_fmt+0x5c/0x80
  Jun 17 20:20:06 dev kernel: [13314.032784]  [<ffffffff81380292>] ? __list_remove_profile+0x62/0xe0
  Jun 17 20:20:06 dev kernel: [13314.032788]  [<ffffffff8138abcf>] __aa_proxy_redirect+0xff/0x130
  Jun 17 20:20:06 dev kernel: [13314.032792]  [<ffffffff81395dc6>] destroy_ns+0x86/0xa0
  Jun 17 20:20:06 dev kernel: [13314.032794]  [<ffffffff81395d0f>] __aa_remove_ns+0x2f/0x60
  Jun 17 20:20:06 dev kernel: [13314.032798]  [<ffffffff81382a63>] aa_remove_profiles+0x193/0x270
  Jun 17 20:20:06 dev kernel: [13314.032800]  [<ffffffff81379721>] ? __aa_kvmalloc+0x41/0x60
  Jun 17 20:20:06 dev kernel: [13314.032803]  [<ffffffff8137724e>] profile_remove+0x9e/0x1f0
  Jun 17 20:20:06 dev kernel: [13314.032808]  [<ffffffff8120c468>] __vfs_write+0x18/0x40
  Jun 17 20:20:06 dev kernel: [13314.032811]  [<ffffffff8120cdf9>] vfs_write+0xa9/0x1a0
  Jun 17 20:20:06 dev kernel: [13314.032814]  [<ffffffff8120bd8f>] ? do_sys_open+0x1bf/0x2a0
  Jun 17 20:20:06 dev kernel: [13314.032818]  [<ffffffff8120dab5>] SyS_write+0x55/0xc0
  Jun 17 20:20:06 dev kernel: [13314.032823]  [<ffffffff81825bf2>] entry_SYSCALL_64_fastpath+0x16/0x71
  Jun 17 20:20:06 dev kernel: [13314.032826] ---[ end trace 2eb06377c45f3d4c ]---

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