Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1512815
Title:
14.04: read() from pty doesn't finish.
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