As we have noticed a random "Segmentation fault" error with the following backtrace:
(gdb) bt
#0 _int_free (av=0x7f3db4000020, p=0x7f3db40018a0, have_lock=0) at malloc.c:4199
#1 0x0000557164b22982 in Catch::AssertionInfo::~AssertionInfo (this=0x7f3c32fcc3c8, __in_chrg=<optimized out>) at /home/gsbot/hetao/libvineyard/thirdparty/etcd-cpp-apiv3/catch.hpp:827
#2 0x0000557164b0afd6 in Catch::AssertionResult::~AssertionResult (this=0x7f3c32fcc3c8, __in_chrg=<optimized out>) at /home/gsbot/hetao/libvineyard/thirdparty/etcd-cpp-apiv3/catch.hpp:7275
#3 0x0000557164b117f4 in Catch::AssertionStats::~AssertionStats (this=0x7f3c32fcc3c0, __in_chrg=<optimized out>) at /home/gsbot/hetao/libvineyard/thirdparty/etcd-cpp-apiv3/catch.hpp:10254
#4 0x0000557164b26d8c in Catch::RunContext::assertionEnded (this=0x7ffc893f2e40, result=...) at /home/gsbot/hetao/libvineyard/thirdparty/etcd-cpp-apiv3/catch.hpp:5981
#5 0x0000557164b0f77f in Catch::ResultBuilder::handleResult (this=0x7f3c32fcca00, result=...) at /home/gsbot/hetao/libvineyard/thirdparty/etcd-cpp-apiv3/catch.hpp:8271
#6 0x0000557164b0f6ee in Catch::ResultBuilder::captureExpression (this=0x7f3c32fcca00) at /home/gsbot/hetao/libvineyard/thirdparty/etcd-cpp-apiv3/catch.hpp:8267
#7 0x0000557164b0f2ca in Catch::ResultBuilder::endExpression (this=0x7f3c32fcca00) at /home/gsbot/hetao/libvineyard/thirdparty/etcd-cpp-apiv3/catch.hpp:8229
#8 0x0000557164b4637c in Catch::ExpressionLhs<bool>::endExpression (this=0x7f3c32fcc6f0) at /home/gsbot/hetao/libvineyard/thirdparty/etcd-cpp-apiv3/catch.hpp:1850
#9 0x0000557164b176de in <lambda(const string&, size_t)>::operator()(const std::string &, size_t) const (__closure=0x557164dcb6b0, key="/test/test_key", index=112)
at /home/gsbot/hetao/libvineyard/thirdparty/etcd-cpp-apiv3/tst/LockTest.cpp:184
Signed-off-by: Tao He <sighingnow@gmail.com>