bucket_engine.c:831 assert()

bucket_engine.c:831 assert – FW: rebalance hung in 3x dgm - amazon large instances

Thread 1 (Thread 22243):
#0 0x00007f543c7dc6b5 in raise () from /lib64/libc.so.6
#1 0x00007f543c7dde95 in abort () from /lib64/libc.so.6
#2 0x00007f543c7d5645 in __assert_fail () from /lib64/libc.so.6
#3 0x00007f543b3a1092 in get_engine_handle (h=0x7f543b5a6400,
cookie=0x7f54301ca478) at bucket_engine.c:831
#4 0x00007f543b3a16bd in bucket_item_allocate (handle=0x56de, cookie=0x56e3,
itm=0x6, key=0xffffffffffffffff, nkey=139999730841344,
nbytes=8243121631822625381, flags=0, exptime=0) at bucket_engine.c:1530
#5 0x0000000000410c1f in process_bin_update (c=0x7f54301ca478)
at daemon/memcached.c:3110
#6 complete_nread_binary (c=0x7f54301ca478) at daemon/memcached.c:3349
#7 0x0000000000411791 in complete_nread (c=0x7f54301ca478)
at daemon/memcached.c:3471
#8 conn_nread (c=0x7f54301ca478) at daemon/memcached.c:5275
#9 0x00000000004073f4 in event_handler (fd=<value optimized out>,
which=<value optimized out>, arg=0x7f54301ca478)
at daemon/memcached.c:5576
#10 0x00007f543d3d9df9 in event_process_active_single_queue (base=0x1b09260,
flags=0) at event.c:1308
#11 event_process_active (base=0x1b09260, flags=0) at event.c:1375
#12 event_base_loop (base=0x1b09260, flags=0) at event.c:1572
#13 0x0000000000413394 in worker_libevent (arg=0x1b07dc0)
at daemon/thread.c:304