BUG #14571: 10.0 devel hang when create subscription

The following bug has been logged on the website:

Bug reference: 14571
Logged by: Zhou Digoal
Email address: digoal(at)126(dot)com
PostgreSQL version: Unsupported/Unknown
Operating system: CentOS 6.x x64
Description:

HI,
i use this commit:
https://git.postgresql.org/gitweb/?p=postgresql.git;a=snapshot;h=1513dbea7f89053476a5e95e2f2e952135a5b34c;sf=tgz

when i create subscription , client hang .

this is bt:

(gdb) bt
#0 0x00007f0ab9e7df13 in __epoll_wait_nocancel () from /lib64/libc.so.6
#1 0x0000000000846636 in WaitEventSetWait ()
#2 0x0000000000846a83 in WaitLatchOrSocket ()
#3 0x00007f0aaad5fed1 in libpqrcv_PQexec () from
/home/digoal/pgsql10/lib/libpqwalreceiver.so
#4 0x00007f0aaad5fff7 in libpqrcv_create_slot () from
/home/dege.zzz/pgsql10/lib/libpqwalreceiver.so
#5 0x000000000059e101 in CreateSubscription ()
#6 0x00000000005e1f09 in ProcessUtilitySlow.isra.7 ()
#7 0x00000000005e2f19 in standard_ProcessUtility ()
#8 0x00000000005e3ab5 in PortalRunUtility ()
#9 0x00000000005e7a8f in PortalRunMulti ()
#10 0x00000000005e8550 in PortalRun ()
#11 0x00000000005eb2d9 in exec_simple_query ()
#12 0x00000000005ee4e5 in PostgresMain ()
#13 0x0000000000471cc1 in ServerLoop ()
#14 0x0000000000674e1b in PostmasterMain ()
#15 0x000000000087ad32 in main ()

best regards.