使用cluster模式，建立连接后发送消息报错assert((s->sending & 0xffff) != 0),导致服务器崩溃

[RiceCN]

开了两个进程(A，B)，A进程先启动，B进程后启动，当B进程启动成功后，A进程通过cluster模式向B进程发送消息报错。
堆栈信息：
#0 0x00007f36c86a434e in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:67
#1 0x00007f36c86a5795 in abort () at abort.c:91
#2 0x00007f36c869d8fe in __assert_fail_base (fmt=, assertion=0x4caf54 "(s->sending & 0xffff) != 0", file=0x4cae1b "skynet-src/socket_server.c", line=,
function=) at assert.c:94
#3 0x00007f36c869d9c0 in __assert_fail (assertion=0x4caf54 "(s->sending & 0xffff) != 0", file=0x4cae1b "skynet-src/socket_server.c", line=1195, function=0x4cb390 "dec_sending_ref") at assert.c:103
#4 0x000000000040dd5e in ctrl_cmd () at skynet-src/socket_server.c:1195
#5 0x000000000040e50b in socket_server_poll () at skynet-src/socket_server.c:1483
#6 0x000000000040bcab in skynet_socket_poll ()
#7 0x000000000040a9c7 in thread_socket ()
#8 0x00007f36c9347d74 in start_thread (arg=0x7f36c57f9700) at pthread_create.c:305
#9 0x00007f36c87572cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115

对应代码：
static inline void
dec_sending_ref(struct socket_server *ss, int id) {
struct socket * s = &ss->slot[HASH_ID(id)];
// Notice: udp may inc sending while type == SOCKET_TYPE_RESERVE
if (s->id == id && s->protocol == PROTOCOL_TCP) {
assert((s->sending & 0xffff) != 0);
ATOM_DEC(&s->sending);
}
}

不知是啥原因，若忽略掉assert((s->sending & 0xffff) != 0)也能正常跑，就是不知道会造成啥后果

[cloudwu]

1. 能够复现吗？
2. 更新到最新，再查问题。

[RiceCN]

不是必现，出现此问题后，我把断言去掉后，sending值每次减1(值为负数)。我更新到最新版本试试

[RiceCN]

最新版本暂未重现此问题，先关闭此issues