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[Launchpad Bug Tracker <1813873@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.18.0-15.16

---------------
linux (4.18.0-15.16) cosmic; urgency=medium

  * Ubuntu boot failure. 4.18.0-14 boot stalls. (does not boot) (LP: #1814555)
    - Revert "drm/i915/ringbuffer: Delay after EMIT_INVALIDATE for gen4/gen5"

  * Userspace break as a result of missing patch backport (LP: #1813873)
    - tty: Don't hold ldisc lock in tty_reopen() if ldisc present

 -- Stefan Bader <stefan.bader@xxxxxxxxxxxxx>  Thu, 07 Feb 2019 11:24:34
+0100

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

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

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https://bugs.launchpad.net/bugs/1813873

Title:
  Userspace break as a result of missing patch backport

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Cosmic:
  Fix Released

Bug description:
  Hi,

  The most recent set of Ubuntu kernels applied a variety of tty patches
  including:
  https://github.com/torvalds/linux/commit/c96cf923a98d1b094df9f0cf97a83e118817e31b

  But have not applied the more recent
  https://github.com/torvalds/linux/commit/d3736d82e8169768218ee0ef68718875918091a0
  patch.

  This second patch is required to prevent a rather serious regression
  where userspace applications reading from stdin can receive EAGAIN
  when they should not.

  I will try to link correspondence from the mailing list archives once
  they are available, but for now if you have access to the linux-
  console mailing list you can find discussion under the thread
  "Userspace break? read from STDIN returns EAGAIN if tty is "touched"".

  I would appreciate it if this could be examined soon as it is a
  regression on userspace.

  Thanks
  Michael

  
  Good:
  4.15.0-43-generic #46-Ubuntu SMP Thu Dec 6 14:45:28 UTC 2018

  
  Bad:
  4.15.0-44-generic #47-Ubuntu SMP Mon Jan 14 11:26:59 UTC 2019

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