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[Launchpad Bug Tracker <1397976@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.13.0-65.105

---------------
linux (3.13.0-65.105) trusty; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1498108

  [ Upstream Kernel Changes ]

  * net: Fix skb_set_peeked use-after-free bug
      - LP: #1497184

linux (3.13.0-64.104) trusty; urgency=low

  [ Luis Henriques ]

  * Release Tracking Bug
    - LP: #1493803

  [ Chris J Arges ]

  * [Config] DEFAULT_IOSCHED="deadline" for ppc64el
    - LP: #1469829

  [ Upstream Kernel Changes ]

  * tcp: fix recv with flags MSG_WAITALL | MSG_PEEK
    - LP: #1486146
  * libceph: abstract out ceph_osd_request enqueue logic
    - LP: #1488035
  * libceph: resend lingering requests with a new tid
    - LP: #1488035
  * n_tty: Refactor input_available_p() by call site
    - LP: #1397976
  * tty: Fix pty master poll() after slave closes v2
    - LP: #1397976
  * md: use kzalloc() when bitmap is disabled
    - LP: #1493305
  * ata: pmp: add quirk for Marvell 4140 SATA PMP
    - LP: #1493305
  * libata: add ATA_HORKAGE_BROKEN_FPDMA_AA quirk for HP 250GB SATA disk
    VB0250EAVER
    - LP: #1493305
  * libata: add ATA_HORKAGE_NOTRIM
    - LP: #1493305
  * libata: force disable trim for SuperSSpeed S238
    - LP: #1493305
  * libata: increase the timeout when setting transfer mode
    - LP: #1493305
  * libata: Do not blacklist M510DC
    - LP: #1493305
  * mac80211: clear subdir_stations when removing debugfs
    - LP: #1493305
  * ALSA: hda - Add new GPU codec ID 0x10de007d to snd-hda
    - LP: #1493305
  * drm: Stop resetting connector state to unknown
    - LP: #1493305
  * usb: dwc3: Reset the transfer resource index on SET_INTERFACE
    - LP: #1493305
  * usb: xhci: Bugfix for NULL pointer deference in xhci_endpoint_init()
    function
    - LP: #1493305
  * xhci: Calculate old endpoints correctly on device reset
    - LP: #1493305
  * xhci: report U3 when link is in resume state
    - LP: #1493305
  * xhci: prevent bus_suspend if SS port resuming in phase 1
    - LP: #1493305
  * xhci: do not report PLC when link is in internal resume state
    - LP: #1493305
  * USB: OHCI: Fix race between ED unlink and URB submission
    - LP: #1493305
  * usb-storage: ignore ZTE MF 823 card reader in mode 0x1225
    - LP: #1493305
  * blkcg: fix gendisk reference leak in blkg_conf_prep()
    - LP: #1493305
  * tile: use free_bootmem_late() for initrd
    - LP: #1493305
  * Input: usbtouchscreen - avoid unresponsive TSC-30 touch screen
    - LP: #1493305
  * md/raid1: fix test for 'was read error from last working device'.
    - LP: #1493305
  * mmc: omap_hsmmc: Fix DTO and DCRC handling
    - LP: #1493305
  * isdn/gigaset: reset tty->receive_room when attaching ser_gigaset
    - LP: #1493305
  * mmc: sdhci-pxav3: fix platform_data is not initialized
    - LP: #1493305
  * mmc: block: Add missing mmc_blk_put() in power_ro_lock_show()
    - LP: #1493305
  * mmc: sdhci-esdhc: Make 8BIT bus work
    - LP: #1493305
  * bonding: correctly handle bonding type change on enslave failure
    - LP: #1493305
  * net: Clone skb before setting peeked flag
    - LP: #1493305
  * bridge: mdb: fix double add notification
    - LP: #1493305
  * usb: gadget: mv_udc_core: fix phy_regs I/O memory leak
    - LP: #1493305
  * inet: frags: fix defragmented packet's IP header for af_packet
    - LP: #1493305
  * bonding: fix destruction of bond with devices different from
    arphrd_ether
    - LP: #1493305
  * ARM: OMAP2+: hwmod: Fix _wait_target_ready() for hwmods without sysc
    - LP: #1493305
  * ASoC: pcm1681: Fix setting de-emphasis sampling rate selection
    - LP: #1493305
  * iscsi-target: Fix use-after-free during TPG session shutdown
    - LP: #1493305
  * iscsi-target: Fix iscsit_start_kthreads failure OOPs
    - LP: #1493305
  * iscsi-target: Fix iser explicit logout TX kthread leak
    - LP: #1493305
  * ALSA: hda - Apply fixup for another Toshiba Satellite S50D
    - LP: #1493305
  * vhost: actually track log eventfd file
    - LP: #1493305
  * xfs: remote attributes need to be considered data
    - LP: #1493305
  * ALSA: usb-audio: add dB range mapping for some devices
    - LP: #1493305
  * drm/radeon/combios: add some validation of lvds values
    - LP: #1493305
  * x86/efi: Use all 64 bit of efi_memmap in setup_e820()
    - LP: #1493305
  * ipr: Fix locking for unit attention handling
    - LP: #1493305
  * ipr: Fix incorrect trace indexing
    - LP: #1493305
  * ipr: Fix invalid array indexing for HRRQ
    - LP: #1493305
  * ALSA: hda - Fix MacBook Pro 5,2 quirk
    - LP: #1493305
  * x86/xen: Probe target addresses in set_aliased_prot() before the
    hypercall
    - LP: #1493305
  * netfilter: ctnetlink: put back references to master ct and expect
    objects
    - LP: #1493305
  * bridge: mdb: fix delmdb state in the notification
    - LP: #1493305
  * ipvs: fix crash with sync protocol v0 and FTP
    - LP: #1493305
  * act_pedit: check binding before calling tcf_hash_release()
    - LP: #1493305
  * netfilter: nf_conntrack: Support expectations in different zones
    - LP: #1493305
  * ipvs: do not use random local source address for tunnels
    - LP: #1493305
  * ALSA: hda - fix cs4210_spdif_automute()
    - LP: #1493305
  * niu: don't count tx error twice in case of headroom realloc fails
    - LP: #1493305
  * net/mlx4_core: Fix wrong index in propagating port change event to VFs
    - LP: #1493305
  * ipvs: fix crash if scheduler is changed
    - LP: #1493305
  * Linux 3.13.11-ckt26
    - LP: #1493305

 -- Brad Figg <brad.figg@xxxxxxxxxxxxx>  Mon, 21 Sep 2015 10:16:41 -0700

-- 
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https://bugs.launchpad.net/bugs/1397976

Title:
  tty hangup regression in 3.13 kernel (trusty LTS)

Status in linux package in Ubuntu:
  Fix Released
Status in linux-lts-trusty package in Ubuntu:
  Invalid
Status in linux source package in Precise:
  Invalid
Status in linux-lts-trusty source package in Precise:
  In Progress
Status in linux source package in Trusty:
  Fix Released
Status in linux-lts-trusty source package in Trusty:
  Invalid

Bug description:
  From https://lkml.org/lkml/2014/10/10/345

  #####
  Commit f95499c3030f ("n_tty: Don't wait for buffer work in read() loop")
  introduces a race window where a pty master can be signalled that the ptyslave was closed before all the data that the slave wrote is delivered.
  Commit f8747d4a466a ("tty: Fix pty master read() after slave closes") fixed theproblem in case of n_tty_read, but the problem still exists for n_tty_poll.This can be seen by running 'for ((i=0; i<100;i++));do ./test.py ;done'where test.py is:

  import os, select, pty
  (pid, pty_fd) = pty.fork()

  if pid == 0:
     os.write(1, 'This string should be received by parent')
  else:
     poller = select.epoll()
     poller.register( pty_fd, select.EPOLLIN )
     ready = poller.poll( 1 * 1000 )
     for fd, events in ready:
        if not events & select.EPOLLIN:
           print 'missed POLLIN event'
        else:
           print os.read(fd, 100)
     poller.close()

  The string from the slave is missed several times.
  This patch takes the same approach as the fix for read and special casesthis condition for poll.
  Tested on 3.16.
  #####

  This is has been merged to Linus Torvalds branch:
  https://github.com/torvalds/linux/commit/c4dc304677e8d566572c4738d95c48be150c6606

  This would be needed to be implemented in to 3.13 kernel too. As both
  12.04 and 14.04 is currently running the Trusty LTS it affectes both.

  br,

  Björn

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