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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => grizzly-3

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https://bugs.launchpad.net/bugs/1115786

Title:
  Starting a LXC Container can lead to a kernel oops

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  If you are using a qcow iamge with an lxc container, starting a lxc
  container will lead to a kernel oops (attached below), this is due to
  the nbd being disconnected while the lxc container is still running.

  Feb  4 15:10:58 homer kernel: [ 2483.980180] Kernel BUG at ffffffff811c50b4 [verbose debug info unavailable]
  Feb  4 15:10:58 homer kernel: [ 2483.982652] Modules linked in: ebt_arp(F) ebt_ip(F) veth(F) xt_conntrack(F) xt_nat(F) openvswitch ip6table_filter(F) ip6_tables(F) ebtable_nat(F) ebtables(F) xt_state(F) ipt_REJECT(F) xt_CHECKSUM(F) iptable_mangle(F) xt_tc
  pudp(F) iptable_filter(F) ipt_MASQUERADE(F) iptable_nat(F) nf_conntrack_ipv4(F) nf_defrag_ipv4(F) nf_nat_ipv4(F) nf_nat(F) nf_conntrack(F) ip_tables(F) x_tables(F) bridge(F) stp(F) llc(F) ib_iser rdma_cm ib_addr iw_cm ib_cm ib_sa ib_mad ib_core iscsi_tcp(
  F) libiscsi_tcp(F) libiscsi(F) scsi_transport_iscsi(F) nfsd(F) auth_rpcgss(F) nfs_acl(F) nfs(F) lockd(F) sunrpc(F) fscache(F) dm_crypt(F) arc4(F) rt2800pci rt2800lib snd_hda_codec_hdmi rt2x00pci snd_hda_codec_realtek rt2x00lib snd_hda_intel mac80211 snd_h
  da_codec kvm_amd snd_hwdep(F) cfg80211 kvm snd_pcm(F) snd_page_alloc(F) eeprom_93cx6<4>[ 2484.001668] CPU 0 
  Feb  4 15:10:58 homer kernel: [ 2484.007849] RIP: 0010:[<ffffffff811c50b4>]  [<ffffffff811c50b4>] submit_bh+0x154/0x1e0
  Feb  4 15:10:58 homer kernel: [ 2484.014575] RAX: 0000000000040005 RBX: ffff88006cdbdb60 RCX: 0000000000000019
  Feb  4 15:10:58 homer kernel: [ 2484.021599] RBP: ffff8800cf925aa0 R08: 000000000a000020 R09: 0000000000000000
  Feb  4 15:10:58 homer kernel: [ 2484.028831] R13: ffff880067b5a400 R14: 0000000000005bc8 R15: ffff8801dfb9ec00
  Feb  4 15:10:58 homer kernel: [ 2484.036334] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  Feb  4 15:10:58 homer kernel: [ 2484.044179] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  Feb  4 15:10:58 homer kernel: [ 2484.052237] Process init (pid: 10006, threadinfo ffff8800cf924000, task ffff8801df86dd00)
  Feb  4 15:10:58 homer kernel: [ 2484.060569]  ffff88006cdbdb60 0000000000000411 ffff880067b5a400 0000000000005bc8
  Feb  4 15:10:58 homer kernel: [ 2484.069418]  ffff8800cf925ad0 ffffffff811c6263 ffff8800cf925b18 ffffffff812526e8
  Feb  4 15:10:58 homer kernel: [ 2484.078454]  [<ffffffff811c61d7>] __sync_dirty_buffer+0x57/0xd0
  Feb  4 15:10:58 homer kernel: [ 2484.087813]  [<ffffffff812526e8>] ext4_commit_super+0x198/0x230
  Feb  4 15:10:58 homer kernel: [ 2484.097368]  [<ffffffff81253914>] ext4_error_inode+0x64/0x120
  Feb  4 15:10:58 homer kernel: [ 2484.107094]  [<ffffffff811ca0f7>] ? bio_put+0x97/0xc0
  Feb  4 15:10:58 homer kernel: [ 2484.116986]  [<ffffffff8123bf53>] ext4_find_entry+0x323/0x4e0
  Feb  4 15:10:58 homer kernel: [ 2484.127088]  [<ffffffff8123c162>] ext4_lookup+0x52/0x170
  Feb  4 15:10:58 homer kernel: [ 2484.137356]  [<ffffffff8119d278>] __lookup_hash+0x38/0x50
  Feb  4 15:10:58 homer kernel: [ 2484.147795]  [<ffffffff811a1c09>] path_lookupat+0x6b9/0x740
  Feb  4 15:10:58 homer kernel: [ 2484.158434]  [<ffffffff8117c531>] ? kmem_cache_alloc+0x31/0x130
  Feb  4 15:10:58 homer kernel: [ 2484.169290]  [<ffffffff811a1cc4>] filename_lookup+0x34/0xc0
  Feb  4 15:10:58 homer kernel: [ 2484.180358]  [<ffffffff813071ba>] ? apparmor_cred_prepare+0x3a/0x60
  Feb  4 15:10:58 homer kernel: [ 2484.191661]  [<ffffffff811922ec>] sys_faccessat+0x9c/0x1e0
  Feb  4 15:10:58 homer kernel: [ 2484.203168]  [<ffffffff81192448>] sys_access+0x18/0x20
  Feb  4 15:10:58 homer kernel: [ 2484.214875] Code: e4 a1 44 89 e0 41 5c 41 5d 41 5e 5d c3 66 2e 0f 1f 84 00 00 00 00 00 40 f6 c7 01 0f 84 14 ff ff ff f0 80 66 01 f7 e9 0a ff ff ff <0f> 0b 48 8b 53 70 c1 e0 09 41 f6 c5 01 89 43 30 89 42 08 75 9a 
  Feb  4 15:10:58 homer kernel: [ 2484.234017]  RSP <ffff8800cf925a80>
  Feb  4 15:10:58 homer kernel: [ 2484.480951] block nbd3: Attempted send on closed socket

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