1. I know hardware issues never get answered but thought I'd add it anyway just for reference. If you know the cause please do share!

    Code:
    Receiving unhandled NULL exception
    #0  0x007f0886aaf340 in _L_unlock_13
    #1  0x007f0886aaf9e0 in physx::Cm::CmEventNameProvider::~CmEventNameProvider()
    #2  0x007f0886aafaf0 in physx::Cm::CmEventNameProvider::~CmEventNameProvider()
    #3  0x007f0886aafbd0 in physx::Cm::CmEventNameProvider::~CmEventNameProvider()
    #4  0x007f0886ab2750 in physx::Cm::CmEventNameProvider::~CmEventNameProvider()
    #5  0x007f0886ab2b80 in physx::Cm::CmEventNameProvider::~CmEventNameProvider()
    #6  0x007f0886ab2d20 in physx::Cm::CmEventNameProvider::~CmEventNameProvider()
    #7  0x007f0886ab2da0 in physx::Cm::CmEventNameProvider::~CmEventNameProvider()
    #8  0x007f0886ab2dc0 in std::vector<core::basic_string<char, core::StringStorageDefault<char> >, std::allocator<core::basic_string<char, core::StringStorageDefault<char> > > >::~vector()
    #9  0x007f0886ab2dd0 in std::vector<core::basic_string<char, core::StringStorageDefault<char> >, std::allocator<core::basic_string<char, core::StringStorageDefault<char> > > >::~vector()
    #10 0x007f0886ab2e80 in std::vector<core::basic_string<char, core::StringStorageDefault<char> >, std::allocator<core::basic_string<char, core::StringStorageDefault<char> > > >::~vector()
    #11 0x007f0886ab2ef0 in std::vector<core::basic_string<char, core::StringStorageDefault<char> >, std::allocator<core::basic_string<char, core::StringStorageDefault<char> > > >::~vector()
    #12 0x007f0886ab2f00 in std::vector<core::basic_string<char, core::StringStorageDefault<char> >, std::allocator<core::basic_string<char, core::StringStorageDefault<char> > > >::~vector()
    #13 0x007f0886ab2f20 in start_thread
    #14 0x007f0886ab2fc0 in clone
     
  2. Im not sure if you resolved this error, but I also got this, and fixed it.
    Personally I fixed it by following this post:
    Server crashing no matter what I do

    I deleted the libeac_server.so file and validated my steam install.

    Hope this helps!