kernel-packages team mailing list archive

[Eric Desrochers <eric.desrochers@xxxxxxxxxxxxx>]

I'm writing this comment on behalf of someone that does experience the
problem and have tested the test kernel (Wily kernel with commit
e81107d) by Joseph Salisbury.

Here is the feedbacks:

---
Hello,

We examined whether the provided kernel works on Ubuntu 15.10 by running
our test program.

4.2.0-16 kernel: The problem occurred 30 times at 630 running.
4.2.0-17.21~lp1512815 kernel: 0 time at 100000 running. (We didn't install linux-cloud-tools packages.)

We think the fixed kernel works fine.

By the way, if you are referencing 3.18.23, there is an extra
spin_unlock_irqrestore() which should be removed by
http://pastebin.com.keephe.com/L14RzUcF
,so please be aware.

We will wait for a kernel backported for Ubuntu 14.04 LTS (x86_64).
---

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https://bugs.launchpad.net/bugs/1512815

Title:
  read() from pty doesn't finish.

Status in linux package in Ubuntu:
  In Progress

Bug description:
  It has been brought to my attention

  By the attached test program pty, a pair of process repeats writing
  and reading only '\n' to a master pseudoterminal device (/dev/ptmx)
  and a slave pseudoterminal device (/dev/pts/N) each. When we carry out
  the following 30 pairs 10,000 times, in a pair each process doesn't
  finish reading.

  $ pty 30
  The following message will be usually indicated immediately.
  #name copy num/sec usec/num
  pty_switch 30 1541842 0.648575

  When a message wasn't indicated any more, we got the attached dump file. 
  A kernel was 3.13.0-45.74. 
  A system was Ubuntu 14.04 LTS.

  The same problem occurred in case of 3.13.0-55.92 kernel and the following kernel have been tested as well:
  2.6.32, 3.10: not reproduces.
  3.19, 4.0.0, 4.1.3: reproduces.

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