Mac 启动Crash: 0 failed in bufferevent_decref_and_unlock_

[xuaofei]

error: module importing failed: invalid pathname
�[01;32m2021-10-05 17:04:22 [thread-main] INFO: �[0mworker threads: 4, config: /Users/xxxx/.config/pegas/config
�[01;32m2021-10-05 17:04:22 [thread-3056] INFO: �[0mcurrent server: 0, server length: 2
�[01;32m2021-10-05 17:04:22 [thread-3056] INFO: �[0mController Listening at: /tmp/pegas.sock
�[01;32m2021-10-05 17:04:22 [thread-6896] INFO: �[0mListening at 0.0.0.0:1080
�[01;32m2021-10-05 17:04:22 [thread-3744] INFO: �[0mListening at 0.0.0.0:1080
�[01;32m2021-10-05 17:04:22 [thread-3472] INFO: �[0mListening at 0.0.0.0:1080
�[01;32m2021-10-05 17:04:22 [thread-0320] INFO: �[0mListening at 0.0.0.0:1080
[err] bufferevent.c:713: Assertion bufev_private->refcnt > 0 failed in bufferevent_decref_and_unlock_
Program ended with exit code: 9

Darwin Mac-mini.local 19.6.0 Darwin Kernel Version 19.6.0: Mon Aug 31 22:12:52 PDT 2020; root:xnu-6153.141.2~1/RELEASE_X86_64 x86_64

Mac-mini-$ cmake -DCMAKE_BUILD_TYPE=Release -DWITH_APPLET=ON .. -G "Xcode"
-- The C compiler identification is AppleClang 12.0.0.12000032
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Found libevent2 includes: /usr/local/include/event2/event.h
-- Found libevent2 library: /usr/local/lib/libevent.dylib
-- Found libevent2 core library: /usr/local/lib/libevent_core.dylib
-- Found libevent2 extra library: /usr/local/lib/libevent_extra.dylib
-- Found libevent2 openssl library: /usr/local/lib/libevent_openssl.dylib
-- Found libevent2 mbedtls library: LIBEVENT2_MBEDTLS_LIBRARIES-NOTFOUND
-- Found openssl library root: /usr/local/Cellar/openssl@1.1/1.1.1l/
-- Found OpenSSL: /usr/local/Cellar/openssl@1.1/1.1.1l/lib/libcrypto.dylib (found suitable version "1.1.1l", minimum required is "1.1.0")
-- Found openssl libraries: /usr/local/Cellar/openssl@1.1/1.1.1l/lib/libssl.dylib;/usr/local/Cellar/openssl@1.1/1.1.1l/lib/libcrypto.dylib
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/xxxx/Desktop/Code/MyProject/pegasocks/build

Mac-mini-:build xxxx$ brew install libevent
Warning: libevent 2.1.12 is already installed and up-to-date.
To reinstall 2.1.12, run:
brew reinstall libevent

[chux0519]

不太确定是什么原因，依赖看起来都是满足的，不使用 Xcode ，直接编译最新的 master 分支试试看

mkdir build && cd build

cmake -DCMAKE_BUILD_TYPE=Release -DWITH_APPLET=ON ..

make -j

看看可以启动吗，如果还是遇到问题，手动编译安装最新的 libevent 再试一次

如果还是遇到同样的问题，麻烦你在 Debug 模式下，lldb 启动它，crash 后 bt 一下，看看输出。

[xuaofei]

不使用Xcode直接make -j也有问题。奔溃原因应该是一致的：bufferevent_decref_and_unlock_

另外发现brew install libevent 是安装的2.1.12版本但是看到目录下面是libevent-2.1.7.dylib 不清楚是不是正常情况。

[chux0519]

刚用 mac 试了下，发现 brew 安装的 libevent，lib 的版本号也不一致

[chux0519@Yongshengs-MacBook-Pro build]$ ls  /usr/local/Cellar/libevent/2.1.12/lib/
libevent-2.1.7.dylib       libevent_core.a             libevent_extra.dylib          libevent_pthreads-2.1.7.dylib
libevent.a                 libevent_core.dylib         libevent_openssl-2.1.7.dylib  libevent_pthreads.a
libevent.dylib             libevent_extra-2.1.7.dylib  libevent_openssl.a            libevent_pthreads.dylib
libevent_core-2.1.7.dylib  libevent_extra.a            libevent_openssl.dylib        pkgconfig

这里应该是正常情况，后面的 7 应该是 7 月发布的意思，完整的版本号实际上类似：libevent-2.1-7_2.1.12-stable-1

可以先手动编译安装一下最新的 libevent ，然后再编译一下 pegas

> git clone https://github.com/libevent/libevent.git
> cd libevent
> mkdir build && cd build
> cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$(pwd) -DOPENSSL_ROOT_DIR=/usr/local/Cellar/openssl\@1.1/1.1.1l/ -DEVENT__DISABLE_MBEDTLS=ON ..
> make -j
> make install

这里会安装最新版本的 libevent 到 build 目录，然后 pull 下最新的 pegasocks 代码，cmake 时指定一下 libevent 版本

> cmake -DCMAKE_BUILD_TYPE=Release -DWITH_APPLET=1 -DLibevent2_ROOT=/Users/$USER/repos/libevent/build ..

也许是最近的一些重构 break 了 2.12 的某些功能(master 分支的 libevent 不存在这个问题)，修复后我会更新到这个 issue，目前先暂时这样用一下。

[xuaofei]

按照上面的方式编译libevent ,然后指定libevent目录编译通过并且可以正常运行PegasApp了。

谢谢大大🙏

[chux0519]

客气了，这个问题还有点奇怪，只在 OSX 上可以复现，后面我再仔细看看。