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[Steve Langasek <1824687@xxxxxxxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu Disco)
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/1824687

Title:
  4.4.0-145-generic Kernel Panic  ip6_expire_frag_queue

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Cosmic:
  Invalid
Status in linux source package in Disco:
  Won't Fix

Bug description:
  [SRU Justification]

  == Impact ==

  Since 05c0b86b96 "ipv6: frags: rewrite ip6_expire_frag_queue()" the
  16.04/4.4 kernel crashes whenever that functions gets called (on busy
  systems this can be every 3-4 hours). While this potentially affects
  Cosmic and later, too, the fix differs on later kernels (Bionic is not
  yet affected as it does not yet carry updates to the frags handling).

  == Fix ==

  For Xenial and Cosmic, the proposed fix would be additional changes to ip6_expipre_frag_queue(), taken from follow-up changes to ip_expire().
  For Disco, I would hold back because we have a backlog of stable patches there and depending on what got backported to 5.0.y there would be a simpler fix.
  For current development kernels, one just needs to ensure that the following upstream change is included: 47d3d7fdb10a "ip6: fix skb leak in ip6frag_expire_frag_queue()".

  == Testcase ==

  Unfortunately this could not be re-created locally. But a test kernel
  which had the proposed fix applied was showing good testing (see
  comment #37 and #38).

  == Risk of Regression ==

  The modified function is only called in rare cases and the positive
  testing in production would cover this. So I would consider it low.

  ---

  Description:	Ubuntu 16.04.6 LTS
  Release:	16.04

  After upgrading our server to this Kernel we experience frequent Kernel panics (Attachment).
  Every 3 hours.
  Our machine has a throuput of about 600 Mbits/s
  The Panics are around the area of ip6_expire_frag_queue.

    __pskb_pull_tail
    ip6_dst_lookup_tail
    _decode_session6
    __xfrm_decode_session
    icmpv6_route_lookup
    icmp6_send

  It seems similar to Bug Report in Debian.
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=922488

  According to the bug finder of above bug it also occurred after using a Kernel with the change of
  rewrite ip6_expire_frag_queue()

  Intermediate solution. We disabled IPv6 on this machine to avoid further Panics.
  Please let me know what information is missing. The ubuntu-bug linux was send. And I hope it is attached to this report.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-145-generic 4.4.0-145.171
  ProcVersionSignature: Ubuntu 4.4.0-145.171-generic 4.4.176
  Uname: Linux 4.4.0-145-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  Date: Sun Apr 14 11:40:11 2019
  InstallationDate: Installed on 2018-03-18 (391 days ago)
  InstallationMedia: Ubuntu-Server 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-signed
  UpgradeStatus: Upgraded to xenial on 2018-10-21 (174 days ago)
  ---
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Apr 12 21:04 seq
   crw-rw---- 1 root audio 116, 33 Apr 12 21:04 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=/dev/mapper/tor3--vg-swap_1
  InstallationDate: Installed on 2018-03-18 (393 days ago)
  InstallationMedia: Ubuntu-Server 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
  IwConfig: Error: [Errno 2] No such file or directory
  Lsusb:
   Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 003: ID 0557:2221 ATEN International Co., Ltd Winbond Hermon
   Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Supermicro X9SRE/X9SRE-3F/X9SRi/X9SRi-3F
  Package: linux (not installed)
  PciMultimedia:

  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-145-generic root=/dev/mapper/hostname--vg-root ro
  ProcVersionSignature: Ubuntu 4.4.0-145.171-generic 4.4.176
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-145-generic N/A
   linux-backports-modules-4.4.0-145-generic  N/A
   linux-firmware                             1.157.21
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  xenial xenial
  Uname: Linux 4.4.0-145-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2018-10-21 (176 days ago)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 10/08/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.0c
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: X9SRE/X9SRE-3F/X9SRi/X9SRi-3F
  dmi.board.vendor: Supermicro
  dmi.board.version: 1.2
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 0123456789
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.0c:bd10/08/2012:svnSupermicro:pnX9SRE/X9SRE-3F/X9SRi/X9SRi-3F:pvr0123456789:rvnSupermicro:rnX9SRE/X9SRE-3F/X9SRi/X9SRi-3F:rvr1.2:cvnSupermicro:ct3:cvr0123456789:
  dmi.product.name: X9SRE/X9SRE-3F/X9SRi/X9SRi-3F
  dmi.product.version: 0123456789
  dmi.sys.vendor: Supermicro

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