** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

** Changed in: linux (Ubuntu)
       Status: Incomplete => Triaged

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => Triaged

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => Medium

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भाषा समायोजकहरुको समूह, which is subscribed to Xenial.
Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1748671

Title:
  BUG: unable to handle kernel NULL pointer dereference at
  0000000000000009

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Triaged

Bug description:
  Got this bug/oops while running with the linux-image-4.4.0-113-generic
  (4.4.0-113.136) kernel from -proposed:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000009
  IP: [<ffffffffab413ad5>] csum_and_copy_from_iter+0x55/0x4c0
  PGD 0 
  Oops: 0000 [#1] SMP 
  Modules linked in: ctr ccm veth xt_CHECKSUM iptable_mangle xt_comment ec_sys 
bridge stp llc nf_log_ipv6 ip6table_filter ip6t_MASQUERADE 
nf_nat_masquerade_ipv6 ip6table_nat nf_nat_ipv6 ip6_tables nf_log_ip
   snd ghash_clmulni_intel soundcore r8169 psmouse input_leds cfg80211 rtsx_pci 
mii vhost_net vhost media ahci libahci macvtap macvlan mei_me mei kvm_intel kvm 
irqbypass tpm_crb i2c_hid intel_lpss_acpi inte
  CPU: 2 PID: 3997 Comm: dnsmasq Tainted: P        W  O    4.4.0-113-generic 
#136-Ubuntu
  Hardware name: System76                        Lemur/Lemur, BIOS 5.12 
02/17/2017
  task: ffff880830269e00 ti: ffff880035c44000 task.ti: ffff880035c44000
  RIP: 0010:[<ffffffffab413ad5>]  [<ffffffffab413ad5>] 
csum_and_copy_from_iter+0x55/0x4c0
  RSP: 0018:ffff880035c47a18  EFLAGS: 00010246
  RAX: 00000000ab729fd0 RBX: 000000000000001c RCX: ffff880035c47e98
  RDX: ffff880035c47a94 RSI: 000000000000001c RDI: ffff8807ef1a7424
  RBP: ffff880035c47a80 R08: 0000000000000000 R09: ffff8807ef1a7424
  R10: ffff8807ef1a7424 R11: ffff8807ef1a7400 R12: ffff880035c47e98
  R13: 0000000000000000 R14: 00ffffffabea6920 R15: 0000000000000001
  FS:  00007ff2b234d880(0000) GS:ffff88086ed00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000000000009 CR3: 0000000035c1e000 CR4: 0000000000360670
  Stack:
   ffff88084e001600 ffffffffab72d1d7 ffff880830f18500 ffff880035c47aaf
   ffff880035c47a94 00000000000001c0 00000000ffffffff b0f4001fc4815eea
   000000000000001c ffff880830f18500 0000000000000000 ffff880035c47d30
  Call Trace:
   [<ffffffffab72d1d7>] ? __alloc_skb+0x87/0x1f0
   [<ffffffffab782cb6>] ip_generic_getfrag+0x56/0xe0
   [<ffffffffab7abc0f>] raw_getfrag+0xaf/0x100
   [<ffffffffab78450a>] __ip_append_data.isra.45+0x98a/0xb90
   [<ffffffffab7abb60>] ? raw_recvmsg+0x1c0/0x1c0
   [<ffffffffab7abb60>] ? raw_recvmsg+0x1c0/0x1c0
   [<ffffffffab78478a>] ip_append_data.part.46+0x7a/0xe0
   [<ffffffffab785474>] ip_append_data+0x34/0x40
   [<ffffffffab7ac8a4>] raw_sendmsg+0x724/0xc00
   [<ffffffffab3a4ea0>] ? aa_sk_perm+0x70/0x210
   [<ffffffffab3a5761>] ? aa_sock_msg_perm+0x61/0x150
   [<ffffffffab7bc91b>] inet_sendmsg+0x6b/0xa0
   [<ffffffffab723b5e>] sock_sendmsg+0x3e/0x50
   [<ffffffffab724151>] SYSC_sendto+0x101/0x190
   [<ffffffffab729fd0>] ? sock_setsockopt+0x180/0x830
   [<ffffffffab397072>] ? apparmor_socket_setsockopt+0x22/0x30
   [<ffffffffab724c7e>] SyS_sendto+0xe/0x10
   [<ffffffffab84df9f>] entry_SYSCALL_64_fastpath+0x1c/0x93
  Code: f3 48 0f 47 de 48 85 db 0f 84 8b 01 00 00 8b 02 49 89 f9 49 89 cc 4c 8b 
71 08 89 45 c4 8b 01 a8 04 0f 85 79 01 00 00 4c 8b 79 18 <4d> 8b 6f 08 4d 29 f5 
49 39 dd 4c 0f 47 eb a8 02 0f 85 36 02 00 
  RIP  [<ffffffffab413ad5>] csum_and_copy_from_iter+0x55/0x4c0
   RSP <ffff880035c47a18>
  CR2: 0000000000000009
  ---[ end trace bdd9157c94a456b6 ]---

  The trigger is when I start an artful lxd container and it tries to
  get an IPv4/IPv6. Oddly enough, the same thing works perfectly for my
  xenial container. My lxd-bridge has dnsmasq contained by Apparmor
  which is non standard but always worked flawlessly.

  I can trigger the bug 100% of the time so validating any tentative fix
  should be easy.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-113-generic 4.4.0-113.136
  ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
  Uname: Linux 4.4.0-112-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  simon      7244 F.... pulseaudio
  CurrentDesktop: Unity
  CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read 
kernel buffer failed: Operation not permitted
  Date: Sat Feb 10 16:45:26 2018
  HibernationDevice: RESUME=/dev/mapper/nvme0n1p3_crypt
  InstallationDate: Installed on 2016-12-06 (431 days ago)
  InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Beta amd64 
(20161206)
  MachineType: System76 Lemur
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-112-generic.efi.signed 
root=UUID=49432620-38ed-44bd-912a-7bc51eec3a35 ro quiet splash possible_cpus=4 
nmi_watchdog=0 kaslr vsyscall=none vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-112-generic N/A
   linux-backports-modules-4.4.0-112-generic  N/A
   linux-firmware                             1.157.16
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/17/2017
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 5.12
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: Lemur
  dmi.board.vendor: System76
  dmi.board.version: lemu7
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: System76
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr5.12:bd02/17/2017:svnSystem76:pnLemur:pvrlemu7:rvnSystem76:rnLemur:rvrlemu7:cvnSystem76:ct10:cvrN/A:
  dmi.product.name: Lemur
  dmi.product.version: lemu7
  dmi.sys.vendor: System76
  --- 
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  simon      7244 F.... pulseaudio
  CurrentDesktop: Unity
  CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read 
kernel buffer failed: Operation not permitted
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=/dev/mapper/nvme0n1p3_crypt
  InstallationDate: Installed on 2016-12-06 (431 days ago)
  InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Beta amd64 
(20161206)
  MachineType: System76 Lemur
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-112-generic.efi.signed 
root=UUID=49432620-38ed-44bd-912a-7bc51eec3a35 ro quiet splash possible_cpus=4 
nmi_watchdog=0 kaslr vsyscall=none vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-112-generic N/A
   linux-backports-modules-4.4.0-112-generic  N/A
   linux-firmware                             1.157.16
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  xenial
  Uname: Linux 4.4.0-112-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip libvirtd lpadmin lxd plugdev sambashare sudo 
wireshark
  _MarkForUpload: True
  dmi.bios.date: 02/17/2017
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 5.12
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: Lemur
  dmi.board.vendor: System76
  dmi.board.version: lemu7
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: System76
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr5.12:bd02/17/2017:svnSystem76:pnLemur:pvrlemu7:rvnSystem76:rnLemur:rvrlemu7:cvnSystem76:ct10:cvrN/A:
  dmi.product.name: Lemur
  dmi.product.version: lemu7
  dmi.sys.vendor: System76

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