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[Kamal Mostafa <kamal@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu Trusty)
       Status: In Progress => Fix Committed

** Changed in: linux (Ubuntu Vivid)
       Status: In Progress => Fix Committed

** Changed in: linux (Ubuntu Wily)
       Status: In Progress => Fix Committed

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

** Changed in: linux-lts-utopic (Ubuntu Trusty)
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1572316

Title:
  oops when propagating mounts into containers - RIP:
  0010:[<ffffffff8123cb3e>] [<ffffffff8123cb3e>]
  propagate_one+0xbe/0x1c0

Status in linux package in Ubuntu:
  Fix Committed
Status in linux-lts-utopic package in Ubuntu:
  Invalid
Status in linux source package in Trusty:
  Fix Committed
Status in linux-lts-utopic source package in Trusty:
  Fix Committed
Status in linux source package in Vivid:
  Fix Committed
Status in linux-lts-utopic source package in Vivid:
  Invalid
Status in linux source package in Wily:
  Fix Committed
Status in linux-lts-utopic source package in Wily:
  Invalid
Status in linux source package in Xenial:
  Fix Committed
Status in linux-lts-utopic source package in Xenial:
  Invalid
Status in linux source package in Yakkety:
  Fix Committed
Status in linux-lts-utopic source package in Yakkety:
  Invalid

Bug description:
  SRU Justification:

  Impact: Propagation to some mount tree configurations can cause the
  kernel to oops. This is trivially reproducible using lxd.

  Fix: Upstream cherry pick.

  Regression Potential: Both Eric and I have tested the fix and believe
  that the post-fix code will handle all cases the same as before except
  for the ones which weren't being handled correctly. I believe the
  regression potential is small.

  ---

  If I use LXD on xenial with a configuration that does something like:
  (/nfs in my case is an nfs mount, but based on the kernel code in
  question anything is probably okay):

  devices:
    bind:
      type: disk
      source: /nfs
      path: /nfs
      recursive: "true"

  and then start the container and on the host, do a new mount:

  sudo mount $ipaddr:/some/nfs/path /nfs/newpath

  You get the following kernel oops:

  Apr 11 21:59:36 stock2 kernel: [ 1648.993034] Oops: 0000 [#1] SMP
  Apr 11 21:59:36 stock2 kernel: [ 1648.993415] Modules linked in: binfmt_misc veth rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache xt_CHECKSUM iptable_mangle xt_tcpudp ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack bridge stp llc iptable_filter ip_tables x_tables zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO) spl(O) zavl(PO) ppdev kvm_intel parport_pc joydev kvm input_leds mac_hid irqbypass parport i2c_piix4 8250_fintek serio_raw ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr sunrpc 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 cirrus ttm drm_kms_helper syscopyarea sysfillrect sysimgblt psmouse fb_sys_fops floppy drm pata_acpi
  Apr 11 21:59:36 stock2 kernel: [ 1649.002015] CPU: 2 PID: 9449 Comm: mount.nfs Tainted: P           O    4.4.0-18-generic #34+tych0201604111025
  Apr 11 21:59:36 stock2 kernel: [ 1649.003037] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
  Apr 11 21:59:36 stock2 kernel: [ 1649.004042] task: ffff880074c1a580 ti: ffff880067d30000 task.ti: ffff880067d30000
  Apr 11 21:59:36 stock2 kernel: [ 1649.004810] RIP: 0010:[<ffffffff8123cb3e>]  [<ffffffff8123cb3e>] propagate_one+0xbe/0x1c0
  Apr 11 21:59:36 stock2 kernel: [ 1649.005654] RSP: 0018:ffff880067d33d68  EFLAGS: 00010297
  Apr 11 21:59:36 stock2 kernel: [ 1649.006211] RAX: ffff88003bb4ca80 RBX: ffff880074ad8300 RCX: ffff880074503500
  Apr 11 21:59:36 stock2 kernel: [ 1649.006934] RDX: 0000000000000000 RSI: 000000000000019c RDI: 0000000000000000
  Apr 11 21:59:36 stock2 kernel: [ 1649.007656] RBP: ffff880067d33d78 R08: ffff8800363bad80 R09: ffffffff813eac5c
  Apr 11 21:59:36 stock2 kernel: [ 1649.008390] R10: ffffea00002b5800 R11: 0000000000018711 R12: ffff8800363ba600
  Apr 11 21:59:36 stock2 kernel: [ 1649.009111] R13: ffff880067d33dc0 R14: ffff880074ad8300 R15: 0000000000000000
  Apr 11 21:59:36 stock2 kernel: [ 1649.009835] FS:  00007f653eac4880(0000) GS:ffff88007cd00000(0000) knlGS:0000000000000000
  Apr 11 21:59:36 stock2 kernel: [ 1649.010642] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  Apr 11 21:59:36 stock2 kernel: [ 1649.011237] CR2: 0000000000000010 CR3: 0000000077a4e000 CR4: 00000000000006e0
  Apr 11 21:59:36 stock2 kernel: [ 1649.011984] Stack:
  Apr 11 21:59:36 stock2 kernel: [ 1649.012255]  ffff880074ad8300 ffff8800363ba600 ffff880067d33db0 ffffffff8123d060
  Apr 11 21:59:36 stock2 kernel: [ 1649.013070]  ffff88003bb4ca80 ffff8800363ba600 ffff88000c211980 0000000000000000
  Apr 11 21:59:36 stock2 kernel: [ 1649.013892]  ffff880067d33e98 ffff880067d33df8 ffffffff8122dd97 ffff88003bb4c900
  Apr 11 21:59:36 stock2 kernel: [ 1649.014751] Call Trace:
  Apr 11 21:59:36 stock2 kernel: [ 1649.015053]  [<ffffffff8123d060>] propagate_mnt+0x120/0x150
  Apr 11 21:59:36 stock2 kernel: [ 1649.015643]  [<ffffffff8122dd97>] attach_recursive_mnt+0x147/0x230
  Apr 11 21:59:36 stock2 kernel: [ 1649.016286]  [<ffffffff8122ded8>] graft_tree+0x58/0x90
  Apr 11 21:59:36 stock2 kernel: [ 1649.016809]  [<ffffffff8122df9e>] do_add_mount+0x8e/0xd0
  Apr 11 21:59:36 stock2 kernel: [ 1649.017342]  [<ffffffff8122ed70>] do_mount+0x2c0/0xe00
  Apr 11 21:59:36 stock2 kernel: [ 1649.017863]  [<ffffffff8122e924>] ? copy_mount_options+0xb4/0x220
  Apr 11 21:59:36 stock2 kernel: [ 1649.018466]  [<ffffffff8122fbdf>] SyS_mount+0x9f/0x100
  Apr 11 21:59:36 stock2 kernel: [ 1649.018996]  [<ffffffff818243b2>] entry_SYSCALL_64_fastpath+0x16/0x71
  Apr 11 21:59:36 stock2 kernel: [ 1649.019631] Code: 39 90 d8 00 00 00 75 ec 8b b0 10 01 00 00 48 89 3d 80 e1 f8 00 48 89 05 81 e1 f8 00 39 b1 10 01 00 00 74 19 48 8b bf d8 00 00 00 <48> 8b 47 10 48 89 3d 5f e1 f8 00 48 89 05 60 e1 f8 00 8b 43 30
  Apr 11 21:59:36 stock2 kernel: [ 1649.022395] RIP  [<ffffffff8123cb3e>] propagate_one+0xbe/0x1c0
  Apr 11 21:59:36 stock2 kernel: [ 1649.022990]  RSP <ffff880067d33d68>
  Apr 11 21:59:36 stock2 kernel: [ 1649.023362] CR2: 0000000000000010
  Apr 11 21:59:36 stock2 kernel: [ 1649.027053] ---[ end trace 46ce79a38cba28a5 ]---

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