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[zasran <1503655@xxxxxxxxxxxxxxxxxx>]

Not 100% sure it's the same problem, my dmesg looks like this:

[   68.951259] BUG: unable to handle kernel paging request at ffffebe000000000
[   68.951264] IP: [<ffffffff811d5f59>] kmem_cache_free+0x69/0x200
[   68.951270] PGD 0 
[   68.951272] Oops: 0000 [#1] SMP 
[   68.951274] Modules linked in: xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat ipt_REJECT nf_reject_ipv4 ebtable_filter ebtables binfmt_misc rfcomm bnep bridge stp llc ip6table_filter ip6_tables nf_conntrack_ipv4 nf_defrag_ipv4 xt_tcpudp xt_recent xt_conntrack nf_conntrack iptable_filter ip_tables x_tables uas usb_storage snd_hda_codec_hdmi nvidia(POE) intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel arc4 rtl8821ae snd_hda_codec_realtek kvm snd_hda_codec_generic snd_soc_rt5640 btcoexist snd_soc_rl6231 crct10dif_pclmul snd_soc_core snd_hda_intel rtl_pci crc32_pclmul snd_hda_controller joydev ghash_clmulni_intel rtlwifi aesni_intel snd_hda_codec snd_compress mac80211 snd_hwdep snd_pcm_dmaengine aes_x86_64 snd_pcm lrw gf128mul
[   68.951302]  snd_seq_midi glue_helper snd_seq_midi_event ablk_helper snd_rawmidi cfg80211 cryptd btusb snd_seq bluetooth hid_logitech_hidpp snd_seq_device snd_timer drm snd i2c_hid mei_me soundcore shpchp mei ie31200_edac lpc_ich edac_core dw_dmac i2c_designware_platform snd_soc_sst_acpi dw_dmac_core 8250_dw spi_pxa2xx_platform video i2c_designware_core mac_hid parport_pc ppdev lp parport autofs4 hid_logitech_dj usbhid hid raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq ahci r8169 libahci raid1 mii raid0 multipath linear sdhci_acpi sdhci
[   68.951328] CPU: 2 PID: 2451 Comm: pulseaudio Tainted: P           OE  3.19.0-31-generic #35-Ubuntu
[   68.951330] Hardware name: GIGABYTE GB-BXi7G3-760/M4HM8BP-00, BIOS F1 08/12/2014
[   68.951331] task: ffff880211bbc4b0 ti: ffff8801de474000 task.ti: ffff8801de474000
[   68.951333] RIP: 0010:[<ffffffff811d5f59>]  [<ffffffff811d5f59>] kmem_cache_free+0x69/0x200
[   68.951336] RSP: 0018:ffff8801de477dd8  EFLAGS: 00010286
[   68.951337] RAX: 000001e000000000 RBX: 0000000000000000 RCX: 00007f46dbffd000
[   68.951338] RDX: 000077ff80000000 RSI: 0000000000000000 RDI: ffff88021508c400
[   68.951339] RBP: ffff8801de477df8 R08: 0000000000000000 R09: ffffffff8123b4f2
[   68.951340] R10: ffff8801e379fda1 R11: ffffebe000000000 R12: ffff88021508c400
[   68.951341] R13: ffff8801e379fb28 R14: 0000000000000000 R15: ffff8801f4514558
[   68.951342] FS:  00007f46ee478780(0000) GS:ffff88021dc80000(0000) knlGS:0000000000000000
[   68.951343] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   68.951344] CR2: ffffebe000000000 CR3: 00000001e07e3000 CR4: 00000000001407e0
[   68.951346] Stack:
[   68.951346]  0000000000000000 0000000000000000 ffff8801e379fae8 ffff8801e379fb28
[   68.951348]  ffff8801de477e28 ffffffff8123b4f2 0000000000000008 ffff8801e379fae8
[   68.951350]  0000000000000000 0000000000000005 ffff8801de477e58 ffffffff8123b534
[   68.951352] Call Trace:
[   68.951357]  [<ffffffff8123b4f2>] ep_unregister_pollwait.isra.7+0x72/0x90
[   68.951359]  [<ffffffff8123b534>] ep_remove+0x24/0xd0
[   68.951361]  [<ffffffff8123c2bf>] eventpoll_release_file+0x5f/0xa0
[   68.951365]  [<ffffffff811f6c58>] __fput+0x1d8/0x250
[   68.951368]  [<ffffffff811f6d1e>] ____fput+0xe/0x10
[   68.951371]  [<ffffffff81093f07>] task_work_run+0xb7/0xf0
[   68.951375]  [<ffffffff81014fe7>] do_notify_resume+0x97/0xb0
[   68.951378]  [<ffffffff817cc1ef>] int_signal+0x12/0x17
[   68.951379] Code: ff 77 00 00 49 bb 00 00 00 00 00 ea ff ff 48 01 d8 48 0f 42 15 c9 40 a4 00 4c 8b 4d 08 48 01 d0 48 c1 e8 0c 48 c1 e0 06 49 01 c3 <49> 8b 03 f6 c4 80 0f 85 53 01 00 00 4c 8b 17 65 4c 03 15 f8 41 
[   68.951400] RIP  [<ffffffff811d5f59>] kmem_cache_free+0x69/0x200
[   68.951402]  RSP <ffff8801de477dd8>
[   68.951403] CR2: ffffebe000000000
[   68.951405] ---[ end trace f976bce8b764902e ]---

I can login but later on I see same symptoms as others, cannot login via
any means - lightdm, ssh, text virtual console. No errors it's just
stuck after I enter password.

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https://bugs.launchpad.net/bugs/1503655

Title:
  Kernel bug in eventpoll_release_file+0x46/0xa0 with 3.13.0-66.107

Status in linux package in Ubuntu:
  Confirmed
Status in linux-lts-utopic package in Ubuntu:
  Invalid
Status in linux source package in Trusty:
  Fix Committed
Status in linux-lts-utopic source package in Trusty:
  Fix Committed
Status in linux source package in Vivid:
  Fix Committed
Status in linux-lts-utopic source package in Vivid:
  Invalid
Status in linux source package in Wily:
  Confirmed
Status in linux-lts-utopic source package in Wily:
  Invalid

Bug description:
  With the latest kernel in trusty-proposed I seem to get panics on my
  X230 laptop:

  BUG: unable to handle kernel paging request at fffffffffffffff8
  IP: [<ffffffff81207176>] eventpoll_release_file+0x46/0xa0
  PGD 1c11067 PUD 1c13067 PMD 0 
  Oops: 0000 [#1] SMP 
  Modules linked in: snd_hrtimer ip6table_filter ip6_tables ebtable_nat ebt
  CPU: 1 PID: 1939 Comm: pulseaudio Not tainted 3.13.0-66-generic #107-Ubun
  Hardware name: LENOVO 2324CTO/2324CTO, BIOS G2ET94WW (2.54 ) 04/30/2013
  task: ffff8800c2068000 ti: ffff8800c4826000 task.ti: ffff8800c4826000
  RIP: 0010:[<ffffffff81207176>]  [<ffffffff81207176>] eventpoll_release_fi
  RSP: 0018:ffff8800c4827e78  EFLAGS: 00010286
  RAX: 0000000000000000 RBX: ffffffffffffffb7 RCX: 000000000000000f
  RDX: 0000000001000000 RSI: 0000000000000000 RDI: ffffffff81c72e80
  RBP: ffff8800c4827ea0 R08: 0000000000000000 R09: 0000000000040000
  R10: ffff880210471e61 R11: 0000000000000206 R12: ffffffffffffffa8
  R13: ffff880210471e61 R14: ffff8800c4bc6c00 R15: ffff8800c4acc8f0
  FS:  00007f3dbedd6740(0000) GS:ffff88021e240000(0000) knlGS:0000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: fffffffffffffff8 CR3: 00000000ce1da000 CR4: 00000000001407e0
  Stack:
  ffff8800c4acc840 0000000000000008 ffff880210471e61 ffff8800c4bc6c00
  ffff8800c4afdc00 ffff8800c4827ee8 ffffffff811c00aa 0000000000000000
  ffff8800c2068000 0000000000000000 ffffffff81ebb680 ffff8800c2068620
  Call Trace:
  [<ffffffff811c00aa>] __fput+0x24a/0x260
  [<ffffffff811c010e>] ____fput+0xe/0x10
  [<ffffffff81088557>] task_work_run+0xa7/0xe0
  [<ffffffff81013ed7>] do_notify_resume+0x97/0xb0
  [<ffffffff81734f5a>] int_signal+0x12/0x17
  Code: 00 41 56 41 55 41 54 53 e8 68 37 52 00 49 8b 07 48 8b 08 49 39 c7 4
  RIP  [<ffffffff81207176>] eventpoll_release_file+0x46/0xa0
  RSP <ffff8800c4827e78>
  CR2: fffffffffffffff8
  ---[ end trace f2ee3b43ddaf4bd4 ]---

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