Segmentation fault on file_reload

[superfast1979]

I can't reproduce it but in continuous integration often we find this coredump.

id 5d80a02a6d51c05d5d6e436ec970aefeec28b9af
reason: netopeer-server killed by SIGSEGV
time: Wed 08 Mar 2017 11:15:13 AM CET
cmdline: /usr/bin/netopeer-server -v 3 &
package: netopeer-server-0.8.0-1
uid: 0 (root)
count: 78
Directory: /var/spool/abrt/ccpp-2017-03-08-11:15:13-11587

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[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/usr/bin/netopeer-server -v 3 &'.
Program terminated with signal 11, Segmentation fault.
#0 0x00007f54863bc994 in fclose@@GLIBC_2.2.5 () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install netopeer-server-0.8.0-1.x86_64
(gdb) where
#0 0x00007f54863bc994 in fclose@@GLIBC_2.2.5 () from /lib64/libc.so.6
#1 0x00007f548717f8d9 in file_reload.part.1 () from /lib64/libnetconf.so.0
#2 0x00007f5487180ca5 in ncds_file_unlock () from /lib64/libnetconf.so.0
#3 0x00007f5487177fa9 in ncds_break_locks () from /lib64/libnetconf.so.0
#4 0x00007f5487158958 in nc_session_close () from /lib64/libnetconf.so.0
#5 0x00007f5487158b66 in nc_session_free () from /lib64/libnetconf.so.0
#6 0x000000000040ae69 in np_ssh_client_transport ()
#7 0x0000000000406210 in client_main_thread ()
#8 0x00007f5486719df5 in start_thread () from /lib64/libpthread.so.0
#9 0x00007f54864471ad in clone () from /lib64/libc.so.6
(gdb)

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segfault.txt