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[Bug 1586418] Re: exercising ptys causes a kernel oops

 

This bug was fixed in the package linux - 4.4.0-34.53

---------------
linux (4.4.0-34.53) xenial; urgency=low

  [ Seth Forshee ]

  * Release Tracking Bug
    - LP: #1606960

  * [APL][SAUCE] Slow system response time due to a monitor bug (LP: #1606147)
    - x86/cpu/intel: Introduce macros for Intel family numbers
    - SAUCE: x86/cpu: Add workaround for MONITOR instruction erratum on Goldmont
      based CPUs

linux (4.4.0-33.52) xenial; urgency=low

  [ Seth Forshee ]

  * Release Tracking Bug
    - LP: #1605709

  * [regression] NFS client: access problems after updating to kernel
    4.4.0-31-generic (LP: #1603719)
    - SAUCE: (namespace) Bypass sget() capability check for nfs

linux (4.4.0-32.51) xenial; urgency=low

  [ Seth Forshee ]

  * Release Tracking Bug
    - LP: #1604443

  * thinkpad yoga 260 wacom touchscreen not working (LP: #1603975)
    - HID: wacom: break out parsing of device and registering of input
    - HID: wacom: Initialize hid_data.inputmode to -1
    - HID: wacom: Support switching from vendor-defined device mode on G9 and G11

  * changelog: add CVEs as first class citizens (LP: #1604344)
    - use CVE numbers in changelog

  * [Xenial] Include Huawei PCIe SSD hio kernel driver (LP: #1603483)
    - SAUCE: import Huawei ES3000_V2 (2.1.0.23)
    - SAUCE: hio: bio_endio() no longer takes errors arg
    - SAUCE: hio: blk_queue make_request_fn now returns a blk_qc_t
    - SAUCE: hio: use alloc_cpumask_var to avoid -Wframe-larger-than
    - SAUCE: hio: fix mask maybe-uninitialized warning
    - [config] enable CONFIG_HIO (Huawei ES3000_V2 PCIe SSD driver)
    - SAUCE: hio: Makefile and Kconfig

  * CVE-2016-5243 (LP: #1589036)
    - tipc: fix an infoleak in tipc_nl_compat_link_dump
    - tipc: fix nl compat regression for link statistics

  * CVE-2016-4470
    - KEYS: potential uninitialized variable

  * integer overflow in xt_alloc_table_info (LP: #1555353)
    - netfilter: x_tables: check for size overflow

  * CVE-2016-3135:
    - Revert "UBUNTU: SAUCE: (noup) netfilter: x_tables: check for size overflow"

  * CVE-2016-4440 (LP: #1584192)
    - kvm:vmx: more complete state update on APICv on/off

  * the system hangs in the dma driver when reboot or shutdown on a baytrail-m
    laptop (LP: #1602579)
    - dmaengine: dw: platform: power on device on shutdown
    - ACPI / LPSS: override power state for LPSS DMA device

  * Add proper  palm detection support for MS Precision Touchpad (LP: #1593124)
    - Revert "HID: multitouch: enable palm rejection if device implements
      confidence usage"
    - HID: multitouch: enable palm rejection for Windows Precision Touchpad

  * Add support for Intel 8265 Bluetooth ([8087:0A2B]) (LP: #1599068)
    - Bluetooth: Add support for Intel Bluetooth device 8265 [8087:0a2b]

  * CVE-2016-4794 (LP: #1581871)
    - percpu: fix synchronization between chunk->map_extend_work and chunk
      destruction
    - percpu: fix synchronization between synchronous map extension and chunk
      destruction

  * Xenial update to v4.4.15 stable release (LP: #1601952)
    - net_sched: fix pfifo_head_drop behavior vs backlog
    - net: Don't forget pr_fmt on net_dbg_ratelimited for CONFIG_DYNAMIC_DEBUG
    - sit: correct IP protocol used in ipip6_err
    - esp: Fix ESN generation under UDP encapsulation
    - netem: fix a use after free
    - ipmr/ip6mr: Initialize the last assert time of mfc entries.
    - Bridge: Fix ipv6 mc snooping if bridge has no ipv6 address
    - sock_diag: do not broadcast raw socket destruction
    - bpf, perf: delay release of BPF prog after grace period
    - neigh: Explicitly declare RCU-bh read side critical section in neigh_xmit()
    - net: macb: fix default configuration for GMAC on AT91
    - net: alx: Work around the DMA RX overflow issue
    - bpf: try harder on clones when writing into skb
    - AX.25: Close socket connection on session completion
    - crypto: ux500 - memmove the right size
    - crypto: user - re-add size check for CRYPTO_MSG_GETALG
    - USB: uas: Fix slave queue_depth not being set
    - usb: quirks: Fix sorting
    - usb: quirks: Add no-lpm quirk for Acer C120 LED Projector
    - usb: musb: only restore devctl when session was set in backup
    - usb: musb: Stop bulk endpoint while queue is rotated
    - usb: musb: Ensure rx reinit occurs for shared_fifo endpoints
    - usb: musb: host: correct cppi dma channel for isoch transfer
    - usb: xhci-plat: properly handle probe deferral for devm_clk_get()
    - USB: xhci: Add broken streams quirk for Frescologic device id 1009
    - xhci: Fix handling timeouted commands on hosts in weird states.
    - USB: mos7720: delete parport
    - usb: gadget: fix spinlock dead lock in gadgetfs
    - usb: host: ehci-tegra: Grab the correct UTMI pads reset
    - usb: dwc3: exynos: Fix deferred probing storm.
    - Linux 4.4.15

  * qeth: delete napi struct when removing a qeth device (LP: #1601831)
    - qeth: delete napi struct when removing a qeth device

  * Adjust KBL PCI-ID's (LP: #1600124)
    - drm/i915: Add more Kabylake PCI IDs.
    - drm/i915: Removing PCI IDs that are no longer listed as Kabylake.

  * [i915_bpo] Rebase driver to v4.7-rc6 + gen9 workarounds + KBP PCH support
    (LP: #1599109)
    - drm/kms_helper: Add a common place to call init and exit functions.
    - drm: Add helper for DP++ adaptors
    - GPU-DRM: Delete unnecessary checks before drm_property_unreference_blob()
    - drm: introduce pipe color correction properties
    - drm: fix blob pointer check
    - drm: atomic helper: do not unreference error pointer
    - drm: fix lut value extraction function
    - drm/dsi: Add a helper to get bits per pixel of MIPI DSI pixel format
    - SAUCE: drm: Introduce drm_malloc_gfp()
    - SAUCE: i915_bpo: Rebase to v4.7-rc6
    - SAUCE: i915_bpo: Add backported workarounds for gen9
    - SAUCE: i915_bpo: Revert "drm/i915: Get panel_type from OpRegion panel
      details"
    - SAUCE: i915_bpo: Introduce Kabypoint PCH for Kabylake H/DT.

  * Baytrail-I got black screen with HDMI output (LP: #1599379)
    - drm/i915: Only ignore eDP ports that are connected
    - drm/i915: Check VBT for port presence in addition to the strap on VLV/CHV

  * [Hyper-V] storvsc messages for CD-ROM medium not present tray closed
    (LP: #1590655)
    - SAUCE: (no-up) scsi: storvsc: Filter out storvsc messages CD-ROM medium not
      present

  * Hotplug device addition issue - missing patches on Xenial kernel
    (LP: #1599250)
    - Revert "UBUNTU: SAUCE: powerpc/eeh: Validate arch in eeh_add_device_early()"
    - Revert "powerpc/eeh: Fix crash in eeh_add_device_early() on Cell"
    - powerpc/iommu: Remove the dependency on EEH struct in DDW mechanism
    - powerpc/pseries: Fix PCI config address for DDW

  * kernel: signal return with invalid floating-point control (LP: #1597971)
    - s390: fix test_fp_ctl inline assembly contraints

  * [Toshiba P50W-B00F] Touchscreen no longer working (LP: #1498667)
    - SAUCE: (no-up) usb: quirks: Add no-lpm quirk for Elan Microelectronics
      Touchpad

  * [yakkety] d-i does not support (ehci_msm) Qualcomm  On-Chip EHCI Host
    Controller (LP: #1599347)
    - d-i: Add ehci_msm to usb-modules

  * [Bug] Legacy audio couldn't work after S3 resume on Kabylake (LP: #1596871)
    - ALSA: hda - Skip ELD notification during PM process
    - ALSA: hda - hdmi add wmb barrier for audio component
    - ALSA: hda - hdmi defer to register acomp eld notifier

  * sync spl  0.6.5.6-0ubuntu4 changes into Xenial kernel source (LP: #1599257)
    - SAUCE: (noup) Update spl to 0.6.5.6-0ubuntu4

  * Config: missing AMD Seattle platform support (LP: #1597574)
    - [Config] Enable the AMD Seattle platform

  * Network installer fails to detect network on AMD Overdrive (ARM64)
    (LP: #1597573)
    - [Config] Add amd-xgbe to nic-modules udeb

  * exercising ptys causes a kernel oops (LP: #1586418)
    - devpts: fix null pointer dereference on failed memory allocation

  * Regression (constant vibration of device) in xpad driver in Ubuntu 16.04
    (LP: #1574102)
    - Input: xpad - move pending clear to the correct location

  * thunderx nics fail to establish link (LP: #1597867)
    - net: thunderx: Fix link status reporting

  * Xenial update to v4.4.14 stable release (LP: #1596575)
    - scsi_lib: correctly retry failed zero length REQ_TYPE_FS commands
    - scsi: Add QEMU CD-ROM to VPD Inquiry Blacklist
    - netlink: Fix dump skb leak/double free
    - tipc: fix nametable publication field in nl compat
    - switchdev: pass pointer to fib_info instead of copy
    - tuntap: correctly wake up process during uninit
    - udp: prevent skbs lingering in tunnel socket queues
    - uapi glibc compat: fix compilation when !__USE_MISC in glibc
    - sfc: on MC reset, clear PIO buffer linkage in TXQs
    - team: don't call netdev_change_features under team->lock
    - vxlan: Accept user specified MTU value when create new vxlan link
    - tcp: record TLP and ER timer stats in v6 stats
    - bridge: Don't insert unnecessary local fdb entry on changing mac address
    - l2tp: fix configuration passed to setup_udp_tunnel_sock()
    - ipv6: Skip XFRM lookup if dst_entry in socket cache is valid
    - vxlan: Relax MTU constraints
    - geneve: Relax MTU constraints
    - vxlan, gre, geneve: Set a large MTU on ovs-created tunnel devices
    - KVM: x86: fix OOPS after invalid KVM_SET_DEBUGREGS
    - KVM: irqfd: fix NULL pointer dereference in kvm_irq_map_gsi
    - ALSA: hda - Add PCI ID for Kabylake
    - ALSA: hda - Fix headset mic detection problem for Dell machine
    - ALSA: hda/realtek - ALC256 speaker noise issue
    - ALSA: hda/realtek - Add support for new codecs ALC700/ALC701/ALC703
    - ALSA: hda/realtek: Add T560 docking unit fixup
    - ARM: fix PTRACE_SETVFPREGS on SMP systems
    - gpio: bcm-kona: fix bcm_kona_gpio_reset() warnings
    - s390/bpf: fix recache skb->data/hlen for skb_vlan_push/pop
    - s390/bpf: reduce maximum program size to 64 KB
    - irqchip/gic-v3: Fix ICC_SGI1R_EL1.INTID decoding mask
    - crypto: public_key: select CRYPTO_AKCIPHER
    - crypto: ccp - Fix AES XTS error for request sizes above 4096
    - arm64: Provide "model name" in /proc/cpuinfo for PER_LINUX32 tasks
    - arm64: mm: always take dirty state from new pte in ptep_set_access_flags
    - powerpc/pseries/eeh: Handle RTAS delay requests in configure_bridge
    - powerpc: Fix definition of SIAR and SDAR registers
    - powerpc: Use privileged SPR number for MMCR2
    - powerpc/pseries: Add POWER8NVL support to ibm,client-architecture-support
      call
    - pinctrl: mediatek: fix dual-edge code defect
    - parisc: Fix pagefault crash in unaligned __get_user() call
    - memcg: add RCU locking around css_for_each_descendant_pre() in
      memcg_offline_kmem()
    - wext: Fix 32 bit iwpriv compatibility issue with 64 bit Kernel
    - x86/entry/traps: Don't force in_interrupt() to return true in IST handlers
    - fix d_walk()/non-delayed __d_free() race
    - sparc: Fix system call tracing register handling.
    - sparc64: Fix bootup regressions on some Kconfig combinations.
    - sparc64: Fix numa node distance initialization
    - sparc64: Fix sparc64_set_context stack handling.
    - sparc/PCI: Fix for panic while enabling SR-IOV
    - sparc64: Reduce TLB flushes during hugepte changes
    - sparc64: Take ctx_alloc_lock properly in hugetlb_setup().
    - sparc: Harden signal return frame checks.
    - sparc64: Fix return from trap window fill crashes.
    - MIPS: Fix 64k page support for 32 bit kernels.
    - crypto: qat - fix adf_ctl_drv.c:undefined reference to adf_init_pf_wq
    - drm/core: Do not preserve framebuffer on rmfb, v4.
    - Linux 4.4.14

  * [Hyper-V] Rebase Hyper-V to 4.6 kernel (LP: #1583357)
    - hv_netvsc: rework link status change handling
    - hv_netvsc: Resize some of the variables in hv_netvsc_packet
    - hv_netvsc: Rearrange the hv_negtvsc_packet to be space efficient
    - hv_netvsc: Eliminate the channel field in hv_netvsc_packet structure
    - hv_netvsc: Eliminate rndis_msg pointer from hv_netvsc_packet structure
    - hv_netvsc: Eliminatte the data field from struct hv_netvsc_packet
    - hv_netvsc: Eliminate send_completion from struct hv_netvsc_packet
    - hv_netvsc: Eliminate send_completion_ctx from struct hv_netvsc_packet
    - hv_netvsc: Don't ask for additional head room in the skb
    - hv_netvsc: move subchannel existence check to netvsc_select_queue()
    - hv_netvsc: remove locking in netvsc_send()
    - hv_netvsc: Eliminate page_buf from struct hv_netvsc_packet
    - hv_netvsc: Eliminate send_completion_tid from struct hv_netvsc_packet
    - hv_netvsc: Eliminate is_data_pkt from struct hv_netvsc_packet
    - hv_netvsc: Eliminate completion_func from struct hv_netvsc_packet
    - hv_netvsc: Eliminate xmit_more from struct hv_netvsc_packet
    - hv_netvsc: Eliminate status from struct hv_netvsc_packet
    - hv_netvsc: Eliminate vlan_tci from struct hv_netvsc_packet
    - storvsc: add logging for error/warning messages
    - hv_netvsc: Fix race condition on Multi-Send Data field
    - kvm/x86: split ioapic-handled and EOI exit bitmaps
    - kvm/x86: per-vcpu apicv deactivation support
    - kvm/x86: Hyper-V synthetic interrupt controller
    - kvm/x86: Hyper-V kvm exit
    - kvm/x86: Rearrange func's declarations inside Hyper-V header
    - kvm/x86: Added Hyper-V vcpu_to_hv_vcpu()/hv_vcpu_to_vcpu() helpers
    - kvm/x86: Hyper-V internal helper to read MSR HV_X64_MSR_TIME_REF_COUNT
    - kvm/x86: Hyper-V SynIC message slot pending clearing at SINT ack
    - kvm/x86: Hyper-V SynIC timers
    - storvsc: Fix a bug in the layout of the hv_fc_wwn_packet
    - storvsc: Properly support Fibre Channel devices
    - storvsc: Refactor the code in storvsc_channel_init()
    - storvsc: Tighten up the interrupt path
    - storvsc: Fix typo in MODULE_PARM_DESC
    - Revert "hv_netvsc: use skb_get_hash() instead of a homegrown implementation"
    - hv_netvsc: use skb_get_hash() instead of a homegrown implementation
    - hv_netvsc: Fix book keeping of skb during batching process
    - storvsc: Install the storvsc specific timeout handler for FC devices
    - storvsc: Use the specified target ID in device lookup
    - Revert "Drivers: hv: vmbus: Cleanup vmbus_set_event()"
    - Drivers: hv: vmbus: Cleanup vmbus_set_event()
    - Revert "Drivers: hv: vmbus: Eliminate the spin lock on the read path"
    - Drivers: hv: vmbus: Eliminate the spin lock on the read path
    - Revert "hv_netvsc: cleanup netdev feature flags for netvsc"
    - hv_netvsc: cleanup netdev feature flags for netvsc
    - hv_netvsc: Restore needed_headroom request
    - kvm/x86: Rename Hyper-V long spin wait hypercall
    - hv_netvsc: add software transmit timestamp support
    - hv_netvsc: add ethtool support for set and get of settings
    - hv_netvsc: Fix accessing freed memory in netvsc_change_mtu()
    - hv_netvsc: Fix the array sizes to be max supported channels
    - hv_netvsc: Fix the order of num_sc_offered decrement
    - x86/hyperv: Avoid reporting bogus NMI status for Gen2 instances
    - Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()
    - Drivers: hv: kvp: fix IP Failover

 -- Seth Forshee <seth.forshee@xxxxxxxxxxxxx>  Wed, 27 Jul 2016 10:01:20
-0500

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

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

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https://bugs.launchpad.net/bugs/1586418

Title:
  exercising ptys causes a kernel oops

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Vivid:
  Fix Released
Status in linux source package in Wily:
  Won't Fix
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  [SRU JUSTIFICATION][TRUSTY][WILY][XENIAL]

  Running stress-ng --pty 1 with a very low vmalloc memory available can
  trip an oops.  This can be generally only be reproduced when memory is
  under a high amount of pressure.  I was able to reproduce reliably by
  forcefully injecting vmalloc to return NULL when the stress-ng pty was
  running.

  [FIX]
  Upstream commit 5353ed8deedee9e5acb9f896e9032158f5d998de ("devpts: fix null pointer dereference on failed memory allocation"). This needs backporting to Yakkey, Xenial, Wily and Trusty because of changes in variable names.

  [TEST]
  Forcefully inject vmalloc to return NULL when running the pty stressor. Without the fix, an oops can be tripped, with the fix, no issues occur.

  ------------------------------------------------------------------

  running: "stress-ng --pty 1" and this occurs in less than 1 second:

  [   67.753230] alloc_vmap_area: 9 callbacks suppressed
  [   67.753233] vmap allocation for size 16384 failed: use vmalloc=<size> to increase size.
  [   67.753235] vmalloc: allocation failure: 8844 bytes
  [   67.753237] stress-ng-pty: page allocation failure: order:0, mode:0x24000c2
  [   67.753240] CPU: 2 PID: 2150 Comm: stress-ng-pty Not tainted 4.4.0-23-generic #41-Ubuntu
  [   67.753241] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
  [   67.753243]  c1abf967 0832d3cc 00000286 f2497c8c c139fe1f c19ce22c 00000001 f2497cbc
  [   67.753248]  c1177396 c19cc624 f506b5f0 00000000 024000c2 f2497cd0 c19ce22c f2497ca4
  [   67.753252]  0832d3cc 0000228c 00000000 f2497cec c11ad2ff 024000c2 00000000 c19ce22c
  [   67.753256] Call Trace:
  [   67.753264]  [<c139fe1f>] dump_stack+0x58/0x79
  [   67.753267]  [<c1177396>] warn_alloc_failed+0xd6/0x110
  [   67.753272]  [<c11ad2ff>] __vmalloc_node_range+0x1ef/0x210
  [   67.753276]  [<c148f590>] ? tty_get_pgrp+0x40/0x40
  [   67.753278]  [<c11ad386>] __vmalloc_node+0x66/0x70
  [   67.753280]  [<c1494e46>] ? n_tty_open+0x16/0xc0
  [   67.753283]  [<c11ad408>] vmalloc+0x38/0x40
  [   67.753284]  [<c1494e46>] ? n_tty_open+0x16/0xc0
  [   67.753290]  [<c1494e46>] n_tty_open+0x16/0xc0
  [   67.753293]  [<c1498fd8>] tty_ldisc_open.isra.2+0x28/0x60
  [   67.753295]  [<c14997fc>] tty_ldisc_setup+0x1c/0x70
  [   67.753297]  [<c14935bc>] tty_init_dev+0x7c/0x180
  [   67.753301]  [<c124fee1>] ? devpts_new_index+0xf1/0x120
  [   67.753303]  [<c149b7a5>] ptmx_open+0x75/0x160
  [   67.753306]  [<c11e0a14>] chrdev_open+0xa4/0x180
  [   67.753310]  [<c11da62c>] do_dentry_open+0x1ec/0x300
  [   67.753312]  [<c11e0970>] ? cdev_put+0x20/0x20
  [   67.753314]  [<c11db60f>] vfs_open+0x4f/0x60
  [   67.753316]  [<c11ea109>] path_openat+0x509/0x1140
  [   67.753318]  [<c11eae94>] ? putname+0x54/0x60
  [   67.753321]  [<c11ebde8>] do_filp_open+0x68/0xe0
  [   67.753324]  [<c11f8d16>] ? __alloc_fd+0x36/0x150
  [   67.753326]  [<c11db9c8>] do_sys_open+0x128/0x2b0
  [   67.753329]  [<c11dbb72>] SyS_open+0x22/0x30
  [   67.753332]  [<c100393d>] do_fast_syscall_32+0x8d/0x150
  [   67.753336]  [<c17a98dc>] sysenter_past_esp+0x3d/0x61
  [   67.753338] Mem-Info:
  [   67.753342] active_anon:5790 inactive_anon:1203 isolated_anon:0
                  active_file:30258 inactive_file:14843 isolated_file:0
                  unevictable:856 dirty:46 writeback:0 unstable:0
                  slab_reclaimable:4643 slab_unreclaimable:5952
                  mapped:5271 shmem:1380 pagetables:193 bounce:0
                  free:166082 free_pcp:1176 free_cma:0
  [   67.753349] DMA free:9616kB min:788kB low:984kB high:1180kB active_anon:288kB inactive_anon:112kB active_file:2436kB inactive_file:1216kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15916kB mlocked:0kB dirty:4kB writeback:0kB mapped:396kB shmem:108kB slab_reclaimable:268kB slab_unreclaimable:428kB kernel_stack:24kB pagetables:8kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
  [   67.753350] lowmem_reserve[]: 0 818 949 949
  [   67.753357] Normal free:567248kB min:41608kB low:52008kB high:62412kB active_anon:18440kB inactive_anon:2992kB active_file:101312kB inactive_file:47608kB unevictable:3164kB isolated(anon):0kB isolated(file):0kB present:897016kB managed:872588kB mlocked:3164kB dirty:180kB writeback:0kB mapped:16216kB shmem:3620kB slab_reclaimable:18304kB slab_unreclaimable:23380kB kernel_stack:1568kB pagetables:688kB unstable:0kB bounce:0kB free_pcp:3736kB local_pcp:224kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
  [   67.753358] lowmem_reserve[]: 0 0 1055 1055
  [   67.753364] HighMem free:87464kB min:128kB low:1804kB high:3480kB active_anon:4432kB inactive_anon:1708kB active_file:17284kB inactive_file:10548kB unevictable:260kB isolated(anon):0kB isolated(file):0kB present:135044kB managed:135044kB mlocked:260kB dirty:0kB writeback:0kB mapped:4472kB shmem:1792kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:76kB unstable:0kB bounce:0kB free_pcp:968kB local_pcp:152kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
  [   67.753365] lowmem_reserve[]: 0 0 0 0
  [   67.753367] DMA: 2*4kB (UM) 1*8kB (E) 2*16kB (UE) 1*32kB (U) 3*64kB (ME) 3*128kB (UME) 1*256kB (M) 3*512kB (UME) 3*1024kB (UME) 2*2048kB (UM) 0*4096kB = 9616kB
  [   67.753378] Normal: 1*4kB (U) 25*8kB (ME) 38*16kB (UM) 25*32kB (ME) 14*64kB (UME) 9*128kB (UM) 9*256kB (UM) 8*512kB (UME) 8*1024kB (UME) 0*2048kB 134*4096kB (M) = 567116kB
  [   67.753389] HighMem: 1*4kB (U) 0*8kB 1*16kB (U) 0*32kB 1*64kB (M) 0*128kB 3*256kB (UM) 3*512kB (UM) 5*1024kB (UM) 1*2048kB (U) 19*4096kB (M) = 87380kB
  [   67.753435] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
  [   67.753436] 47051 total pagecache pages
  [   67.753437] 0 pages in swap cache
  [   67.753439] Swap cache stats: add 0, delete 0, find 0/0
  [   67.753440] Free swap  = 1046524kB
  [   67.753444] Total swap = 1046524kB
  [   67.753450] 262013 pages RAM
  [   67.753459] 33761 pages HighMem/MovableOnly
  [   67.753461] 6126 pages reserved
  [   67.753483] 0 pages cma reserved
  [   67.753486] tty_init_dev: ldisc open failed, clearing slot 3474
  [   67.753525] BUG: unable to handle kernel NULL pointer dereference at 0000001c
  [   67.755622] IP: [<c124ff1a>] devpts_kill_index+0xa/0x60
  [   67.756058] *pdpt = 000000002f82f001 *pde = 0000000000000000
  [   67.756461] Oops: 0000 [#1] SMP
  [   67.756866] Modules linked in: snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm ppdev input_leds snd_timer parport_pc joydev snd parport 8250_fintek soundcore serio_raw i2c_piix4 mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear qxl crc32_pclmul ttm aesni_intel drm_kms_helper aes_i586 syscopyarea sysfillrect xts sysimgblt lrw fb_sys_fops gf128mul ablk_helper cryptd drm pata_acpi psmouse floppy
  [   67.759038] CPU: 2 PID: 2150 Comm: stress-ng-pty Not tainted 4.4.0-23-generic #41-Ubuntu
  [   67.759396] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
  [   67.759758] task: f506b200 ti: f2496000 task.ti: f2496000
  [   67.760109] EIP: 0060:[<c124ff1a>] EFLAGS: 00010246 CPU: 2
  [   67.760460] EIP is at devpts_kill_index+0xa/0x60
  [   67.760806] EAX: 00000000 EBX: 00000000 ECX: 00000033 EDX: 00000d92
  [   67.761165] ESI: fffffff4 EDI: 00000d92 EBP: f2497d54 ESP: f2497d4c
  [   67.761500]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
  [   67.761830] CR0: 80050033 CR2: 0000001c CR3: 355d6ca0 CR4: 001406f0
  [   67.762166] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
  [   67.762497] DR6: fffe0ff0 DR7: 00000400
  [   67.762822] Stack:
  [   67.763139]  00000000 fffffff4 f2497d60 c149b509 e65caa00 f2497d6c c1492bb0 e65caa00
  [   67.763497]  f2497d98 c14935e9 c1a2cf78 00000d92 f64aa7d0 f2497d98 c124fee1 00000d92
  [   67.763860]  e65e66c0 f64aa7d0 f64aa7d0 f2497db4 c149b7a5 00000000 00000d92 c1d20ae0
  [   67.764228] Call Trace:
  [   67.764568]  [<c149b509>] pty_unix98_shutdown+0x29/0x40
  [   67.764917]  [<c1492bb0>] release_tty+0x30/0xe0
  [   67.765272]  [<c14935e9>] tty_init_dev+0xa9/0x180
  [   67.765623]  [<c124fee1>] ? devpts_new_index+0xf1/0x120
  [   67.765974]  [<c149b7a5>] ptmx_open+0x75/0x160
  [   67.766323]  [<c11e0a14>] chrdev_open+0xa4/0x180
  [   67.766668]  [<c11da62c>] do_dentry_open+0x1ec/0x300
  [   67.767013]  [<c11e0970>] ? cdev_put+0x20/0x20
  [   67.767352]  [<c11db60f>] vfs_open+0x4f/0x60
  [   67.767690]  [<c11ea109>] path_openat+0x509/0x1140
  [   67.768030]  [<c11eae94>] ? putname+0x54/0x60
  [   67.768367]  [<c11ebde8>] do_filp_open+0x68/0xe0
  [   67.768704]  [<c11f8d16>] ? __alloc_fd+0x36/0x150
  [   67.769051]  [<c11db9c8>] do_sys_open+0x128/0x2b0
  [   67.769385]  [<c11dbb72>] SyS_open+0x22/0x30
  [   67.769717]  [<c100393d>] do_fast_syscall_32+0x8d/0x150
  [   67.770052]  [<c17a98dc>] sysenter_past_esp+0x3d/0x61
  [   67.770385] Code: 00 b8 fb ff ff ff eb 9d b8 ed ff ff ff eb 96 e8 9d 01 e2 ff 8d b6 00 00 00 00 8d bc 27 00 00 00 00 55 89 e5 56 53 3e 8d 74 26 00 <8b> 40 1c 89 d6 81 78 38 d1 1c 00 00 74 0c a1 f8 59 d1 c1 85 c0
  [   67.771232] EIP: [<c124ff1a>] devpts_kill_index+0xa/0x60 SS:ESP 0068:f2497d4c
  [   67.771607] CR2: 000000000000001c
  [   67.772009] ---[ end trace 40e08a6f48f9983e ]---

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