# LibNiceConnection::close coredump

**URL:** <https://discourse.lynckia.com/t/libniceconnection-close-coredump/1033>\
**Category:** Support\
**Created:** [November 9, 2020, 12:38pm UTC](https://discourse.lynckia.com/t/libniceconnection-close-coredump/1033 "2020-11-09T12:38:38Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![dboy](https://avatars.discourse-cdn.com/v4/letter/d/cdc98d/32.png) [@dboy](https://discourse.lynckia.com/u/dboy)\
**Post date:** [November 9, 2020, 12:38pm UTC](https://discourse.lynckia.com/t/libniceconnection-close-coredump/1033/1 "2020-11-09T12:38:39Z")

</div>

# question

- i found m\_Thread\_.timed\_join(timeout) called in LibNiceConnection::close method, and i face a coredump relation to it when i call LibNiceConnection::close() then delete it , the backtrace and log as below:

## backtrace

```auto
#0 0x00007f35ca960c56 in __memcpy_ssse3_back () from /lib64/libc.so.6
#1 0x00007f35cb3da2e0 in copy ( __n=59814224,__ s2=<optimized out>, __s1=<optimized out>)
    at /home/zhongjiannan/package/gcc-6.1.0/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/char_traits.h:290
#2 _M_copy ( __n=59814224,__ s=<optimized out>, __d=<optimized out>) at /home/zhongjiannan/package/gcc-6.1.0/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/basic_string.h:2877
#3 std::string::append (this=this@entry=0x7f35717ef6e0, __str=...) at /home/zhongjiannan/package/gcc-6.1.0/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/basic_string.tcc:773
#4 0x00007f35b8ed6c90 in operator+<char, std::char_traits<char>, std::allocator<char> > ( __rhs=...,__ lhs=0x7f35b9381cba "id: ", this=<optimized out>)
    at /usr/include/c++/4.8.2/bits/basic_string.tcc:702
#5 erizo::IceConnection::toLog (this=this@entry=0x7f358000d320) at ../erizo/src/erizo/IceConnection.h:124
#6 0x00007f35b8ed7680 in erizo::LibNiceConnection::mainLoop (this=0x7f358000d320) at ../erizo/src/erizo/LibNiceConnection.cpp:255
#7 0x00007f35b8b7c27a in thread_proxy () from /lib64/libboost_thread-mt.so.1.53.0
#8 0x00007f35cabdedc5 in start_thread () from /lib64/libpthread.so.0
#9 0x00007f35ca90d73d in clone () from /lib64/libc.so.6

```

## log

```auto
2020-11-09 15:36:11,991 - DEBUG: LibNiceConnection - id: 230597350002604830, message: interrupt thread to close, this: 0x7f358000d320
2020-11-09 15:36:11,991 - DEBUG: LibNiceConnection - id: 230597350002604830, message:Unrefing loop
2020-11-09 15:36:11,991 - DEBUG: LibNiceConnection - id: 230597350002604830, message: unrefing agent
2020-11-09 15:36:11,992 - DEBUG: LibNiceConnection - id: 230597350002604830, message: Unrefing context
2020-11-09 15:36:11,992 - DEBUG: LibNiceConnection - id: 230597350002604830, message: closed, this: 0x7f358000d320

```

### reason

- main\_loop thread interruptted, but g\_main\_loop\_run may still running, and delete LibNiceConnection instance cause wild pointer(0x7f358000d320)

- why m\_Thread\_.timed\_join used rather than m\_Thread\_.join() ?