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[Launchpad Bug Tracker <1559194@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: In Progress => 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/1559194

Title:
  Bad page state in process genwqe_gunzip pfn:3c275 in the genwqe device
  driver

Status in Release Notes for Ubuntu:
  Fix Released
Status in Ubuntu on IBM z Systems:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  == Comment: #0 - Dmitry Gorbachev <dmitry.gorbachev@xxxxxxxxxx> - 2016-03-17 08:52:41 ==
  An error occurs when running zEDC compression/decompression and hotplugging PCI devices.
  There was 1G of memory, 2 pci functions and 50 threads of gunzipping enabled.

  Mar 14 23:59:01 s8330018 kernel: [ 4972.486883] BUG: Bad page state in process genwqe_gunzip  pfn:3c275
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486888] page:000003d100f09d40 count:-1 mapcount:0 mapping:          (null) index:0x0
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486891] flags: 0x0()
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486895] page dumped because: nonzero _count
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486897] Modules linked in: xt_CHECKSUM(E) iptable_mangle(E) ipt_MASQUERADE(E) nf_nat_masquerade_ipv4(E) iptable_nat(E) nf_conntrack_ipv4(E) nf_defrag_ipv4(E) nf_nat_ipv4(E) nf_nat(E) nf_conntrack(E) xt_tcpudp(E) bridge(E) stp(E) llc(E) iptable_filter(E) ip_tables(E) x_tables(E) genwqe_card(E) crc_itu_t(E) qeth_l2(E) qeth(E) vmur(E) ccwgroup(E) dm_multipath(E) ib_iser(E) rdma_cm(E) iw_cm(E) ib_cm(E) ib_sa(E) ib_mad(E) ib_core(E) ib_addr(E) iscsi_tcp(E) libiscsi_tcp(E) libiscsi(E) scsi_transport_iscsi(E) btrfs(E) zlib_deflate(E) raid10(E) raid456(E) async_memcpy(E) async_raid6_recov(E) async_pq(E) async_xor(E) async_tx(E) xor(E) raid6_pq(E) libcrc32c(E) raid1(E) raid0(E) linear(E) ghash_s390(E) prng(E) aes_s390(E) des_s390(E) des_generic(E) sha512_s390(E) sha256_s390(E) sha1_s390(E) sha_common(E) zfcp(E) qdio(E) scsi_transport_fc(E) dasd_eckd_mod(E) dasd_mod(E)
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486916] CPU: 0 PID: 37867 Comm: genwqe_gunzip Tainted: G        W   E   4.4.0-8-generic #23-Ubuntu
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486916]        00000000209176f8 0000000020917788 0000000000000002 0000000000000000
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486916]        0000000020917828 00000000209177a0 00000000209177a0 0000000000114182
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486916]        0000000000000011 000000000092345a 000003d10000000a 000000000000000a
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486916]        00000000209177e8 0000000020917788 0000000000000000 0000000020914000
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486916]        0000000000000000 0000000000114182 0000000020917788 00000000209177e8
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486922] Call Trace:
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486927] ([<000000000011406e>] show_trace+0xf6/0x148)
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486929]  [<0000000000114136>] show_stack+0x76/0xe8
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486934]  [<0000000000518c26>] dump_stack+0x6e/0x90
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486937]  [<000000000027c376>] bad_page+0xe6/0x148
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486938]  [<0000000000280516>] get_page_from_freelist+0x49e/0xba8
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486940]  [<0000000000280ede>] __alloc_pages_nodemask+0x166/0xb00
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486941]  [<000000000015635a>] s390_dma_alloc+0x82/0x1a0
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486944]  [<000003ff805ea142>] __genwqe_alloc_consistent+0x7a/0x90 [genwqe_card]
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486947]  [<000003ff805ea344>] genwqe_alloc_sync_sgl+0x17c/0x2e0 [genwqe_card]
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486950]  [<000003ff805e52da>] do_execute_ddcb+0x1da/0x348 [genwqe_card]
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486952]  [<000003ff805e5964>] genwqe_ioctl+0x51c/0xc20 [genwqe_card]
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486953]  [<00000000003145ee>] do_vfs_ioctl+0x3b6/0x518
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486955]  [<00000000003147f4>] SyS_ioctl+0xa4/0xb8
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486956]  [<00000000007ad1be>] system_call+0xd6/0x264
  Mar 14 23:59:01 s8330018 kernel: [ 4972.486957]  [<000003ffa9df2492>] 0x3ffa9df2492

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