bfshell cause bf_switch to segfault

[lzhzero]

Hi,
When I use bfshell to send scripts to a running bf_switchd program.
As soon as the bfshell connection is closed, it will cause segfault on the bf_switchd program.
Here is the gdb output:

...
bf_rt cli exited normally.

Thread 13 "bf_cli_smain" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffdeffd640 (LWP 260075)]
0x00007ffff7e32975 in __GI___libc_free (mem=0xffffffffd40017b0) at malloc.c:3288
3288    malloc.c: No such file or directory.
(gdb) bt
#0  0x00007ffff7e32975 in __GI___libc_free (mem=0xffffffffd40017b0) at malloc.c:3288
#1  0x00007ffff7d996a5 in bf_sys_free (ptr=<optimized out>)
    at /P4_SDE/p4-dpdk-target/third-party/target-syslibs/src/bf_sal/linux_usr/bf_sys_mem.c:40
#2  0x00007ffff78a97e4 in clish_shell_fini (this=0x7fffd4000b60)
    at /P4_SDE/p4-dpdk-target/third-party/target-utils/third-party/klish/clish/shell/shell_new.c:195
#3  clish_shell_delete (this=this@entry=0x7fffd4000b60)
    at /P4_SDE/p4-dpdk-target/third-party/target-utils/third-party/klish/clish/shell/shell_new.c:218
#4  0x00007ffff78af808 in cli_thread_start (args=<optimized out>)
    at /P4_SDE/p4-dpdk-target/third-party/target-utils/third-party/klish/clish/shell/shell_thread.c:233
#5  0x00007ffff7f8ad80 in start_thread (arg=0x7fffdeffd640) at pthread_create.c:481
#6  0x00007ffff7ea676f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb)