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Message #155749
[Bug 1512815] Re: read() from pty doesn't finish.
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
trusty' to 'verification-done-trusty'.
If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!
** Tags added: verification-needed-trusty
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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
Status in linux source package in Trusty:
Fix Committed
Status in linux source package in Vivid:
Fix Released
Status in linux source package in Wily:
Fix Committed
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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References