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[Launchpad Bug Tracker <1628976@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.8.0-30.32

---------------
linux (4.8.0-30.32) yakkety; urgency=low

  * CVE-2016-8655 (LP: #1646318)
    - packet: fix race condition in packet_set_ring

 -- Brad Figg <brad.figg@xxxxxxxxxxxxx>  Thu, 01 Dec 2016 08:02:53 -0800

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

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-8655

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https://bugs.launchpad.net/bugs/1628976

Title:
  Ubuntu 16.10: Oops panic in move_page_tables/page_remove_rmap after
  running memory_stress_ng.

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  FYI Canonical:

  We have been seeing various page handling issues during memory stress
  in the 4.8 kernels.  The following is the most recent issue resulting
  in system panics on this host after the 4.8.0-17 update:

  == Comment: #17 - PAVITHRA R. PRAKASH - 2016-09-28 06:26:21 ==
  Hi,

  Tried running on 4.8.0-17-generic kernel. Getting below call trace and
  system crashes. Attaching logs.

  [ 2959.364333] Unable to handle kernel paging request for data at address 0xf000000002fe4020
  [ 2959.364345] Faulting instruction address: 0xc0000000002bb2a0
  [ 2959.364356] Oops: Kernel access of bad area, sig: 11 [#1]
  [ 2959.364364] SMP NR_CPUS=2048 NUMA pSeries
  [ 2959.364377] Modules linked in: rpadlpar_io rpaphp dccp_diag dccp tcp_diag udp_diag inet_diag unix_diag af_packet_diag netlink_diag bnx2x mdio libcrc32c pseries_rng vmx_crypto binfmt_misc ip_tables x_tables autofs4 ibmvscsi crc32c_vpmsum
  [ 2959.364441] CPU: 13 PID: 108 Comm: oom_reaper Not tainted 4.8.0-17-generic #19-Ubuntu
  [ 2959.364452] task: c0000004fbdf9c00 task.stack: c0000004fbe00000
  [ 2959.364461] NIP: c0000000002bb2a0 LR: c000000000300618 CTR: c00000000009ca40
  [ 2959.364471] REGS: c0000004fbe036e0 TRAP: 0300   Not tainted  (4.8.0-17-generic)
  [ 2959.364481] MSR: 800000010280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE,TM[E]>  CR: 24028844  XER: 2000000c
  [ 2959.364526] CFAR: c000000000300614 DAR: f000000002fe4020 DSISR: 40000000 SOFTE: 1 
                 GPR00: c000000000300618 c0000004fbe03960 c0000000014e5e00 f000000002fe4000 
                 GPR04: 0000000000000001 0000000000000800 0000000000000000 c000000001665e00 
                 GPR08: 00000000f900a196 0000000000000001 0000000002fe4000 0000000000000000 
                 GPR12: 0000000000008800 c000000001b37500 0008000000000000 c1ffffffffffe7ff 
                 GPR16: c0000004f62a55f0 00003fff9a000000 00003fff99000000 0000000000000000 
                 GPR20: c0000004fbe03b80 c0000004e0713800 8e017c33020000c0 0000000000010000 
                 GPR24: c0000000fb3614c8 c0000000fce9d990 c0000000fce9d6e4 96a100f90b000040 
                 GPR28: f000000002fe4000 c0000000fb3614c8 0000000000000001 f000000002fe4000 
  [ 2959.364673] NIP [c0000000002bb2a0] page_remove_rmap+0x30/0x4b0
  [ 2959.364685] LR [c000000000300618] zap_huge_pmd+0xf8/0x480
  [ 2959.364692] Call Trace:
  [ 2959.364699] [c0000004fbe03960] [c0000004fbe039a0] 0xc0000004fbe039a0 (unreliable)
  [ 2959.364714] [c0000004fbe039a0] [c000000000300618] zap_huge_pmd+0xf8/0x480
  [ 2959.364726] [c0000004fbe039f0] [c0000000002a68d8] unmap_page_range+0xd08/0xee0
  [ 2959.364740] [c0000004fbe03b20] [c00000000025c474] __oom_reap_task+0x204/0x2c0
  [ 2959.364752] [c0000004fbe03c80] [c00000000025cda8] oom_reaper+0x1e8/0x300
  [ 2959.364765] [c0000004fbe03d80] [c0000000000fd120] kthread+0x110/0x130
  [ 2959.364778] [c0000004fbe03e30] [c0000000000098f0] ret_from_kernel_thread+0x5c/0x6c
  [ 2959.364788] Instruction dump:
  [ 2959.364796] 3c4c0123 3842ab90 7c0802a6 fba1ffe8 fbc1fff0 fbe1fff8 f8010010 f821ffc1 
  [ 2959.364821] 7c7f1b78 7c9e2378 60000000 60000000 <e95f0020> 71480001 392affff 40820008 
  [ 2959.364871] ---[ end trace 178b14c6911b70dc ]---
  [ 2959.372762] 
  [ 2959.372798] Sending IPI to other CPUs
  [ 2959.373834] IPI complete

  Thanks,
  Pavithra

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