kernel-packages team mailing list archive

[Masaki Tachibana <tachibana@xxxxxxxxxxxxxxxxx>]

We tested 
linux-image-3.13.0-67-generic_3.13.0-67.110hf85627v20151105b2_amd64.deb 
and 
linux-image-extra-3.13.0-67-generic_3.13.0-67.110hf85627v20151105b2_amd64.deb 
on Ubuntu 14.04 LTS by running our test program. 

3.13.0-45.74 kernel: The problem occurred 2 times at 3300 running. 
3.13.0-67.110hf85627v20151105b2 kernel: 0 time at 300000 running. 

We think the fixed kernel works fine.

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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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