This is a reproducer for the stall problem in drivers/tty/n_tty.c
To reproduce the problem, save the program below as pty.c, compile it,
and run it in parallel.
# cc -o pty pty.c
# for i in {1..16}; do ./pty& done; wait
The problem can be reproduced on a multi-socket server with recent CPUs.
The program always stalled during the first run when I used a server
with the following CPU.
Intel(R) Xeon(R) CPU E5-2698 v3 @ 2.30GHz
2-sockets x 16-cores x 2-threads
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https://bugs.launchpad.net/bugs/1512815
Title:
14.04: read() from pty doesn't finish.
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