when set track_commit_timestamp on, database system abort startup

HI, Dear pgsql-hackers The details are as follows: Environment: OS:CentOS 6.7 (Final), Linux 3.18.48-11.el6.x86_64 x86_64, 64-bit PostgreSQL: postgres=# select version(); version

function lca('{}'::ltree[]) caused DB Instance crash

HI,Oleg && pgsql-hackers Plese help me to check this is a bug of ltree? thxs! lhl@localhost:~$ cat /etc/issue Ubuntu 14.04.5 LTS \n \l lhl@localhost:~$ uname -av Linux localhost 3.13.0-107-generic #154-Ubuntu SMP Tue Dec 20 09:57:27 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux