so, i added -g -ggdb to setup.py.in and the output maybe have more info:

Thread 315 "python3" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffadfe3700 (LWP 22194)]
__memcpy_ssse3 () at ../sysdeps/x86_64/multiarch/memcpy-ssse3.S:2928
2928            movdqu  -0x20(%rsi), %xmm1
(gdb) bt
#0  __memcpy_ssse3 () at ../sysdeps/x86_64/multiarch/memcpy-ssse3.S:2928
#1  0x00007fffe81fdea0 in std::char_traits<char>::copy (__n=33554431, __s2=0x7ffee20021b8 "", __s1=<optimized out>)
at /usr/src/debug/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/x86_64-redhat-linux/libstdc++-v3/include/bits/char_traits.h:271
#2  std::basic_streambuf<char, std::char_traits<char> >::xsputn (this=0x7fffadfe2868, __s=0x7ffee20021b8 "", __n=140732656523360)
at /usr/src/debug/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/x86_64-redhat-linux/libstdc++-v3/include/bits/streambuf.tcc:90
#3  0x00007fffe81f4bb5 in std::basic_streambuf<char, std::char_traits<char> >::sputn (__n=140732656523360, __s=0x7ffee00021f8 "xrdcl.in0", this=<optimized out>)
at /usr/src/debug/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/x86_64-redhat-linux/libstdc++-v3/include/streambuf:451
#4  std::__ostream_write<char, std::char_traits<char> > (__n=140732656523360, __s=0x7ffee00021f8 "xrdcl.in0", __out=...)
at /usr/src/debug/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/x86_64-redhat-linux/libstdc++-v3/include/bits/ostream_insert.h:50
#5  std::__ostream_insert<char, std::char_traits<char> > (__out=..., __s=0x7ffee00021f8 "xrdcl.in0", __n=140732656523360)
at /usr/src/debug/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/x86_64-redhat-linux/libstdc++-v3/include/bits/ostream_insert.h:101
#6  0x00007fffe88eed93 in std::operator<< <char, std::char_traits<char>, std::allocator<char> > (__str=..., __os=...)
at /opt/rh/devtoolset-7/root/usr/include/c++/7/bits/basic_string.h:6277
#7  XrdCl::PropertyList::Set<XrdCl::XRootDStatus> (this=this@entry=0xd150c0, name="status", item=...) at /home/adrian/work-GRID/xrootd/src/./XrdCl/XrdClPropertyList.hh:219
#8  0x00007fffe88e7291 in (anonymous namespace)::QueuedCopyJob::Run (this=<optimized out>) at /home/adrian/work-GRID/xrootd/src/XrdCl/XrdClCopyProcess.cc:162
#9  0x00007fffe891ae6d in XrdCl::JobManager::RunJobs (this=0x7fffffffb3f0) at /home/adrian/work-GRID/xrootd/src/XrdCl/XrdClJobManager.cc:153
#10 0x00007fffe891aee9 in RunRunnerThread (arg=<optimized out>) at /home/adrian/work-GRID/xrootd/src/XrdCl/XrdClJobManager.cc:34
#11 0x00007ffff769eea5 in start_thread (arg=0x7fffadfe3700) at pthread_create.c:307
#12 0x00007ffff6cbeb0d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

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