A SEGV was seen with a server with an http.exthandler configured. Sample trace from eos build of xrootd, v5.5.5:

#0  0x00007f30bc76a8c1 in __strlen_sse2_pminub () from /lib64/libc.so.6
#1  0x00007f30b81e6824 in std::char_traits<char>::length (__s=0x0)
    at /opt/rh/devtoolset-8/root/usr/include/c++/8/bits/char_traits.h:322
#2  std::string::assign (__s=0x0, this=0x7f300bcb03f8)
    at /opt/rh/devtoolset-8/root/usr/include/c++/8/bits/basic_string.h:4333
#3  std::string::operator= (__s=0x0, this=0x7f300bcb03f8)
    at /opt/rh/devtoolset-8/root/usr/include/c++/8/bits/basic_string.h:3656
#4  XrdHttpExtReq::XrdHttpExtReq (this=<optimized out>, req=<optimized out>, pr=<optimized out>)
    at /usr/src/debug/xrootd-5.5.9/src/XrdHttp/XrdHttpExtHandler.cc:92
#5  0x00007f30b81e110e in XrdHttpReq::ProcessHTTPReq (this=this@entry=0x7f3019c4ab60)
    at /usr/src/debug/xrootd-5.5.9/src/XrdHttp/XrdHttpReq.cc:976
#6  0x00007f30b81d7034 in XrdHttpProtocol::Process (this=0x7f3019c4aa00, lp=<optimized out>)
    at /usr/src/debug/xrootd-5.5.9/src/XrdHttp/XrdHttpProtocol.cc:871
#7  0x00007f30bd8d8ead in XrdLinkXeq::DoIt (this=<optimized out>)
    at /usr/src/debug/xrootd-5.5.9/src/Xrd/XrdLinkXeq.cc:320
#8  XrdLinkXeq::DoIt (this=0x7f305fc2a338) at /usr/src/debug/xrootd-5.5.9/src/Xrd/XrdLinkXeq.cc:308

You can view, comment on, or merge this pull request online at:

  https://github.com/xrootd/xrootd/pull/2007

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