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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Resolved as per original reporter in Xenial+.

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

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https://bugs.launchpad.net/bugs/1545401

Title:
  "kernel BUG at /build/linux-lts-wily-Vv6Eyd/linux-lts-
  wily-4.2.0/mm/memory.c:3146!"

Status in linux package in Ubuntu:
  Fix Released
Status in linux-lts-wily package in Ubuntu:
  Invalid
Status in linux source package in Trusty:
  Invalid
Status in linux-lts-wily source package in Trusty:
  Confirmed
Status in linux source package in Wily:
  Incomplete
Status in linux-lts-wily source package in Wily:
  Invalid

Bug description:
  I was trying to attach gdb to chromium-browser, by passing the PID to
  gdb (gdb -p $PID). The first attempt as non-root user crashed gdb and
  I got this message:

  ------------[ cut here ]------------
  kernel BUG at /build/linux-lts-wily-Vv6Eyd/linux-lts-wily-4.2.0/mm/memory.c:3146!
  invalid opcode: 0000 [#1] SMP
  Modules linked in: vboxpci(OE) vboxnetadp(OE) r8168(OE) vboxnetflt(OE) vboxdrv(OE) ib_cm ib_sa ib_mad ib_core ib_addr libfc qla2xxx scsi_transport_fc configfs pci_stub drbg ansi_cprng ctr ccm dm_crypt ip6table_filter ip6_tables iptable_filter ip_tables x_tables binfmt_misc uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media arc4 hp_wmi sparse_keymap rtsx_pci_ms memstick dm_multipath scsi_dh snd_hda_codec_idt ath9k snd_hda_codec_generic ath9k_common snd_hda_codec_hdmi joydev ath9k_hw input_leds snd_hda_intel serio_raw ath snd_hda_codec snd_hda_core snd_hwdep k10temp snd_pcm_oss mac80211 snd_mixer_oss snd_pcm snd_seq_midi i2c_piix4 snd_seq_midi_event snd_rawmidi cfg80211 snd_seq snd_seq_device snd_timer snd soundcore shpchp parport_pc hp_accel lis3lv02d ppdev input_polldev mac_hid cpuid msr ircomm_tty ircomm irda crc_ccitt lp parport btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear pata_acpi rtsx_pci_sdmmc amdkfd amd_iommu_v2 radeon i2c_algo_bit ttm drm_kms_helper psmouse ahci drm pata_atiixp libahci rtsx_pci wmi video [last unloaded: vboxpci]
  CPU: 3 PID: 25702 Comm: gdb Tainted: G           OE   4.2.0-27-generic #32~14.04.1-Ubuntu
  Hardware name: Hewlett-Packard HP Pavilion dv6 Notebook PC/3590, BIOS F.21 09/13/2011
  task: ffff8800cb54d780 ti: ffff88000a8f0000 task.ti: ffff88000a8f0000
  RIP: 0010:[<ffffffff811a6a90>]  [<ffffffff811a6a90>] handle_mm_fault+0x17e0/0x1840
  RSP: 0018:ffff88000a8f3bb8  EFLAGS: 00010246
  RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00003ffffffff000
  RDX: ffff8801697c04f8 RSI: 0000000000000120 RDI: 00000001697c0067
  RBP: ffff88000a8f3c78 R08: 00000001edddb120 R09: 0000000000000120
  R10: 0000000000000001 R11: ffff8800000004f8 R12: ffff88003265bc00
  R13: ffff880007a18808 R14: 00007f856029fe68 R15: ffff8800aa3843c0
  FS:  00007f3d95334740(0000) GS:ffff88020ed80000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000002b69528 CR3: 000000012a9ad000 CR4: 00000000000006e0
  Stack:
   0000001600000000 ffff880000000016 ffffea0005a5f030 ffffffff817b0e73
   ffff88003265bc00 00007f856029fe68 0000001700000000 ffff8800000004f8
   ffff880000000000 0000000000000017 00007f856029fe68 ffff88003265bc00
  Call Trace:
   [<ffffffff817b0e73>] ? follow_page_pte+0xae/0x307
   [<ffffffff811a070e>] ? follow_page_mask+0x1ce/0x320
   [<ffffffff811a095b>] __get_user_pages+0xfb/0x5b0
   [<ffffffff811a1222>] get_user_pages+0x52/0x60
   [<ffffffff811a16a7>] __access_remote_vm+0xb7/0x1c0
   [<ffffffff811a7620>] access_process_vm+0x50/0x70
   [<ffffffff81081aa9>] ptrace_request+0x2c9/0x5a0
   [<ffffffff817ae9da>] ? queued_spin_lock_slowpath+0xb/0xf
   [<ffffffff810a0efa>] ? wait_task_inactive+0xea/0x1e0
   [<ffffffff811eb508>] ? vfs_write+0x148/0x190
   [<ffffffff81022f51>] arch_ptrace+0x261/0x2b0
   [<ffffffff81080a2f>] ? ptrace_check_attach+0x5f/0x140
   [<ffffffff81081726>] SyS_ptrace+0xa6/0x110
   [<ffffffff817bc3b2>] entry_SYSCALL_64_fastpath+0x16/0x75
  Code: d8 50 a8 81 e8 92 0f ed ff 4c 8b 9d 78 ff ff ff e9 fa ee ff ff 48 8b 7d 98 89 45 80 e8 2a dd fd ff 8b 45 80 89 c3 e9 ba eb ff ff <0f> 0b c7 45 80 01 00 00 00 e9 a5 f7 ff ff 4c 89 c7 48 89 95 68
  RIP  [<ffffffff811a6a90>] handle_mm_fault+0x17e0/0x1840
   RSP <ffff88000a8f3bb8>
  ---[ end trace c5ec208e5d4b9c66 ]---

  Then I tried running it as root (sudo gdb -p $PID). gdb got stuck at
  "Attaching to process ...". I tried killing gdb as root from another
  terminal, by running "killall gdb", but killall got stuck, too. pidof
  and ps also got stuck...

  This is the line referenced in the error message:  http://lxr.free-
  electrons.com/source/mm/memory.c?v=4.2#L3146 , I'm not sure if Ubuntu
  runs a modified version of this file, though. Also, I'm not sure if
  this affects Wily (I guess it does) or if this has been patched
  upstream.

  There is a similar bug report here:
  https://bugzilla.redhat.com/show_bug.cgi?id=1296505 , but it doesn't
  involve gdb.

  Should I report this bug upstream?

  My system is:
  $ lsb_release -a
  LSB Version:    core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:core-4.1-amd64:core-4.1-noarch:security-4.0-amd64:security-4.0-noarch:security-4.1-amd64:security-4.1-noarch
  Distributor ID: Ubuntu
  Description:    Ubuntu 14.04.3 LTS
  Release:        14.04
  Codename:       trusty
  $ uname -r
  4.2.0-27-generic
  $ dpkg -l | grep linux-image-generic
  ii  linux-image-generic-lts-wily                          4.2.0.27.21                                               amd64        Generic Linux kernel image
  --- 
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  pepee      3001 F.... pulseaudio
   /dev/snd/controlC1:  pepee      3001 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 14.04
  EcryptfsInUse: Yes
  MachineType: Hewlett-Packard HP Pavilion dv6 Notebook PC
  Package: linux (not installed)
  ProcFB:
   0 radeondrmfb
   1 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-34-generic root=UUID=5510f07e-5967-4508-b715-e371124b439b ro radeon.dpm=1 radeon.audio=1 clocksource=hpet hpet=enable nomdmonddf nomdmonisw radeon.lockup_timeout=20000 crashkernel=384M-:128M crashkernel=384M-:128M
  ProcVersionSignature: Ubuntu 4.2.0-34.39~14.04.1-generic 4.2.8-ckt4
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-34-generic N/A
   linux-backports-modules-4.2.0-34-generic  N/A
   linux-firmware                            1.134~gd~t
  Tags:  trusty trusty
  Uname: Linux 4.2.0-34-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-06-06 (648 days ago)
  UserGroups: adm admin audio cdrom debian-tor dialout disk fuse kismet libvirtd lpadmin lxd messagebus netdev plugdev sambashare uml-net uucp vboxusers video wireshark
  _MarkForUpload: True
  dmi.bios.date: 09/13/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.21
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 3590
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 33.18
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnHewlett-Packard:bvrF.21:bd09/13/2011:svnHewlett-Packard:pnHPPaviliondv6NotebookPC:pvr0590110000244610000610100:rvnHewlett-Packard:rn3590:rvr33.18:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP Pavilion dv6 Notebook PC
  dmi.product.version: 0590110000244610000610100
  dmi.sys.vendor: Hewlett-Packard

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