** Changed in: linux (Ubuntu Wily)
Status: Fix Committed => Fix Released
** Changed in: linux (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1512815
Title:
read() from pty doesn't finish.
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Trusty:
Fix Released
Status in linux source package in Vivid:
Fix Released
Status in linux source package in Wily:
Fix Released
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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