raft节点移除后程序崩溃，堆栈信息如下，求解

[weingithub]

Program terminated with signal 11, Segmentation fault.
#0 0x00007f1daf27c4c9 in InsertBefore (e=0x55ce799abab8, this=0x7f1d84bae2a0) at brpc/src/butil/containers/linked_list.h:97
97 e->previous_->next_ = this;
(gdb) bt
#0 0x00007f1daf27c4c9 in InsertBefore (e=0x55ce799abab8, this=0x7f1d84bae2a0) at brpc/src/butil/containers/linked_list.h:97
#1 Append (e=0x7f1d84bae2a0, this=0x55ce799abab8) at brpc/src/butil/containers/linked_list.h:171
#2 bthread::wait_for_butex (arg=0x7f1d84bae2a0) at brpc/src/bthread/butex.cpp:514
#3 0x00007f1daf294b4e in bthread::TaskGroup::sched_to (pg=pg@entry=0x7f1d9271a3b0, next_meta=next_meta@entry=0x55ce727ec580) at brpc/src/bthread/task_group.cpp:623
#4 0x00007f1daf2968e2 in sched_to (next_tid=, pg=0x7f1d9271a3b0) at brpc/src/bthread/task_group_inl.h:75
#5 bthread::TaskGroup::run_main_task (this=this@entry=0x55ce71d0b800) at brpc/src/bthread/task_group.cpp:147
#6 0x00007f1daf2924fe in bthread::TaskControl::worker_thread (arg=0x55ce718e8400) at brpc/src/bthread/task_control.cpp:73
#7 0x00007f1daeeb0e25 in start_thread () from /lib64/libpthread.so.0
#8 0x00007f1dac91734d in clone () from /lib64/libc.so.6
(gdb) f 0
#0 0x00007f1daf27c4c9 in InsertBefore (e=0x55ce799abab8, this=0x7f1d84bae2a0) at brpc/src/butil/containers/linked_list.h:97
97 e->previous_->next_ = this;
(gdb) p *e
$1 = {previous_ = 0x0, next_ = 0x0}
(gdb) f 1
#1 Append (e=0x7f1d84bae2a0, this=0x55ce799abab8) atbrpc/src/butil/containers/linked_list.h:171
171 e->InsertBefore(&root_);
(gdb) p root_
$2 = {previous_ = 0x0, next_ = 0x0}

[weingithub]

不知道是否是raft删除不当，还是bthread使用不当？

[chenzhangyi]

跑下asan看下， 这种通常是内存被写坏了

[weingithub]

修改上层逻辑，不再出现该coredump了。