Description of problem:
If open libreoffice, then soffice.bin eats one CPU

Version-Release number of selected component (if applicable):
libreoffice-5.4.4.2-3.fc27.x86_64

https://www-user.rhrk.uni-kl.de/~backes/

How reproducible:
always

Steps to Reproduce:
1.start libreoffice
2.
3.

Actual results:
une CPU is bysy with soffice.bin

Expected results:


Additional info:

1. Running ps:

0 R backes    4383  4368 99  80   0 - 412655 -     13:50 tty2     00:03:05 /usr/lib64/libreoffice/program/soffice.bin --writer --splash-pipe=5


2. Running strace:

loops with the following output:

...

poll([{fd=9, events=POLLIN}, {fd=14, events=POLLIN}, {fd=18, events=POLLIN}], 3, 4293) = 1 ([{fd=9, revents=POLLIN}])
read(9, "\1\0\0\0\0\0\0\0", 16)         = 8
write(9, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=9, events=POLLIN}, {fd=14, events=POLLIN}, {fd=18, events=POLLIN}], 3, 4293) = 1 ([{fd=9, revents=POLLIN}])
read(9, "\1\0\0\0\0\0\0\0", 16)         = 8
write(9, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=9, events=POLLIN}, {fd=14, events=POLLIN}, {fd=18, events=POLLIN}], 3, 4292) = 1 ([{fd=9, revents=POLLIN}])
read(9, "\1\0\0\0\0\0\0\0", 16)         = 8
write(9, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=9, events=POLLIN}, {fd=14, events=POLLIN}, {fd=18, events=POLLIN}], 3, 4292) = 1 ([{fd=9, revents=POLLIN}])
read(9, "\1\0\0\0\0\0\0\0", 16)         = 8
write(9, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=9, events=POLLIN}, {fd=14, events=POLLIN}, {fd=18, events=POLLIN}], 3, 4292) = 1 ([{fd=9, revents=POLLIN}])
read(9, "\1\0\0\0\0\0\0\0", 16)         = 8
write(9, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=9, events=POLLIN}, {fd=14, events=POLLIN}, {fd=18, events=POLLIN}], 3, 4291) = 1 ([{fd=9, revents=POLLIN}])
read(9, "\1\0\0\0\0\0\0\0", 16)         = 8
write(9, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=9, events=POLLIN}, {fd=14, events=POLLIN}, {fd=18, events=POLLIN}], 3, 4291) = 1 ([{fd=9, revents=POLLIN}])
read(9, "\1\0\0\0\0\0\0\0", 16)         = 8
write(9, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=9, events=POLLIN}, {fd=14, events=POLLIN}, {fd=18, events=POLLIN}], 3, 4291^C) = 1 ([{fd=9, revents=POLLIN}])


strace: Process 4383 detached
...

3. Occurs with previous versions of  LO too, for example with ibreoffice-5.4.4.2-1