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[Gavin Guo <gavin.guo@xxxxxxxxxxxxx>]

** Tags removed: verification-needed-trusty
** Tags added: verification-done-trusty

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https://bugs.launchpad.net/bugs/1488035

Title:
  OSDs Linked list corruption causes kernel BUG at
  /build/buildd/linux-3.13.0/net/ceph/osd_client.c:892!

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Trusty:
  Fix Committed

Bug description:
  [Impact]

  The node which mounts a ceph rbd volume causes a panic when all OSD
  daemons on the all ceph nodes are restarted.

  [642981.871592] ------------[ cut here ]------------
  [642981.912255] kernel BUG at
  /build/buildd/linux-3.13.0/net/ceph/osd_client.c:892!
  [642981.994517] invalid opcode: 0000 [#1] SMP
  [642982.037227] Modules linked in: xt_multiport iptable_mangle xt_nat
  xt_tcpudp veth xfs rbd libceph libcrc32c xt_addrtype xt_conntrack
  ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4
  iptable_filter ip_tables x_tables nf_nat nf_conntrack bridge aufs
  ipmi_devintf joydev gpio_ich x86_pkg_temp_thermal intel_powerclamp coretemp
  kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel
  aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd hid_generic mei_me
  ioatdma mei lpc_ich wmi ipmi_si 8021q garp stp mrp llc bonding
  acpi_power_meter mac_hid lp parport ixgbe usbhid dca tg3 ahci libahci hid
  ptp megaraid_sas mdio pps_core
  [642982.528519] CPU: 0 PID: 1062099 Comm: kworker/0:6 Not tainted
  3.13.0-45-generic #74-Ubuntu
  [642982.648057] Hardware name: NEC Express5800/R120f-1M
  [N8100-2203Y]/MS-S0901, BIOS 5.0.4016 12/17/2014
  [642982.775433] Workqueue: ceph-msgr con_work [libceph]
  [642982.841300] task: ffff881028444800 ti: ffff880d92374000 task.ti:
  ffff880d92374000
  [642982.973255] RIP: 0010:[<ffffffffa025f5be>] [<ffffffffa025f5be>]
  osd_reset+0x22e/0x2c0 [libceph]
  [642983.114484] RSP: 0018:ffff880d92375d80 EFLAGS: 00010283
  [642983.188540] RAX: ffff8800197f2ca8 RBX: ffff882028194750 RCX:
  ffff880036bcdc48
  [642983.334096] RDX: ffff8800197f2ca8 RSI: ffff8800197f2c10 RDI:
  0000000000000286
  [642983.485552] RBP: ffff880d92375dd8 R08: 0000000000000000 R09:
  0000000000000000
  [642983.643277] R10: ffffffff8160afcf R11: ffffea00710cae00 R12:
  ffff8800197f2c58
  [642983.805364] R13: ffff882028194810 R14: ffff880036bcdbf8 R15:
  ffff880036bcdc18
  [642983.968728] FS: 0000000000000000(0000) GS:ffff88103fa00000(0000)
  knlGS:0000000000000000
  [642984.135368] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [642984.220577] CR2: 00007f60d4cb7868 CR3: 0000000001c0e000 CR4:
  00000000001407f0
  [642984.383051] Stack:
  [642984.459809] ffff8820281947a8 ffff882028194760 ffff8800197f2800
  ffff8800197f2ca8
  [642984.618038] ffff880d92375da0 ffff880d92375da0 ffff8800197f2c10
  ffff8800197f2830

  [Fix]

  A linked list to manage OSDs in the kernel was corrupted when restarting
  all OSD daemons on all ceph nodes at the almost same time.

  The issues must be fixed by the following.

  libceph: must use new tid when watch is resent
  http://tracker.ceph.com/issues/8806

  This includes two patched and they has been already released.

  http://comments.gmane.org/gmane.comp.file-systems.ceph.devel/20878
  [PATCH 1/2] libceph: abstract out ceph_osd_request enqueue logic
  [PATCH 2/2] libceph: resend lingering requests with a new tid

  3.18 kernel adopts the fixes.

  libceph: abstract out ceph_osd_request enqueue logic
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f671b581f1dac61354186b7373af5f97fe420584
  libceph: resend lingering requests with a new tid
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2cc6128ab2afff7864dbdc33a73e2deaa935d9e0

  [Test Case]

  After setting up the ceph environment, repeatedly issued the following
  command from a node to all ceph nodes.

  rsh -i key -l ubuntu sn_hostname sudo service ceph-all restart

  And verify if there is panics.

  A test kernel with this fix was verified to fix this problem.

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