I just re-run it with the following options:

valgrind --suppressions=$ROOTSYS/etc/valgrind-root.supp --track-origins=yes --trace-children=yes --log-file=valgr.log --tool=memcheck --leak-check=full ./myscript.py

These are xrd-related entries that I get now:

==2396841== 150 bytes in 1 blocks are definitely lost in loss record 27,062 of 41,982
==2396841==    at 0x402D753: malloc (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/valgrind/3.15.0-bcolbf2/lib/valgrind/vgpreload_memcheck-amd64-linux.\
so)
==2396841==    by 0x55E1010: __libc_alloc_buffer_allocate (in /usr/lib64/libc-2.17.so)
==2396841==    by 0x56670CE: __resolv_conf_allocate (in /usr/lib64/libc-2.17.so)
==2396841==    by 0x56650EC: __resolv_conf_load (in /usr/lib64/libc-2.17.so)
==2396841==    by 0x5666987: __resolv_conf_get_current (in /usr/lib64/libc-2.17.so)
==2396841==    by 0x5665391: __res_vinit (in /usr/lib64/libc-2.17.so)
==2396841==    by 0x56664AA: maybe_init (in /usr/lib64/libc-2.17.so)
==2396841==    by 0x566661D: __resolv_context_get (in /usr/lib64/libc-2.17.so)
==2396841==    by 0x566F81B: gethostbyname2_r@@GLIBC_2.2.5 (in /usr/lib64/libc-2.17.so)
==2396841==    by 0x563CCB5: gaih_inet.constprop.8 (in /usr/lib64/libc-2.17.so)
==2396841==    by 0x563D5F3: getaddrinfo (in /usr/lib64/libc-2.17.so)
==2396841==    by 0x2C98380E: XrdNetUtils::GetAddrs(char const*, XrdNetAddr**, int&, XrdNetUtils::AddrOpts, int) (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/\
external/xrootd/4.12.3/lib64/libXrdUtils.so.2.0.0)

and

==2396841== 712 (80 direct, 632 indirect) bytes in 1 blocks are definitely lost in loss record 34,343 of 41,982
==2396841==    at 0x402DDB2: operator new(unsigned long) (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/valgrind/3.15.0-bcolbf2/lib/valgrind/vgpreload_\
memcheck-amd64-linux.so)
==2396841==    by 0x2CC923BC: XrdCryptosslFactory::Cipher(int, char*, int, char const*) (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/xrootd/4.12.3/li\
b64/libXrdCryptossl-4.so)
==2396841==    by 0x2CC36962: XrdSecProtocolgsi::ParseCrypto(XrdOucString) (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/xrootd/4.12.3/lib64/libXrdSec\
gsi-4.so)
==2396841==    by 0x2CC44DFD: XrdSecProtocolgsi::ClientDoInit(XrdSutBuffer*, XrdSutBuffer**, XrdOucString&) (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/exter\
nal/xrootd/4.12.3/lib64/libXrdSecgsi-4.so)
==2396841==    by 0x2CC454A4: XrdSecProtocolgsi::ParseClientInput(XrdSutBuffer*, XrdSutBuffer**, XrdOucString&) (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/e\
xternal/xrootd/4.12.3/lib64/libXrdSecgsi-4.so)
==2396841==    by 0x2CC45894: XrdSecProtocolgsi::getCredentials(XrdSecBuffer*, XrdOucErrInfo*) (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/xrootd/4.\
12.3/lib64/libXrdSecgsi-4.so)
==2396841==    by 0x2CAD260F: XrdCl::XRootDTransport::GetCredentials(XrdSecBuffer*&, XrdCl::HandShakeData*, XrdCl::XRootDChannelInfo*) (in /cvmfs/cms.cern\
.ch/slc7_amd64_gcc900/external/xrootd/4.12.3/lib64/libXrdCl.so.2.0.0)
==2396841==    by 0x2CAD348B: XrdCl::XRootDTransport::DoAuthentication(XrdCl::HandShakeData*, XrdCl::XRootDChannelInfo*) (in /cvmfs/cms.cern.ch/slc7_amd64\
_gcc900/external/xrootd/4.12.3/lib64/libXrdCl.so.2.0.0)
==2396841==    by 0x2CAD3FF5: XrdCl::XRootDTransport::HandShakeMain(XrdCl::HandShakeData*, XrdCl::AnyObject&) (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/ext\
ernal/xrootd/4.12.3/lib64/libXrdCl.so.2.0.0)
==2396841==    by 0x2CAD40CA: XrdCl::XRootDTransport::HandShake(XrdCl::HandShakeData*, XrdCl::AnyObject&) (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/externa\
l/xrootd/4.12.3/lib64/libXrdCl.so.2.0.0)
==2396841==    by 0x2CB333E5: XrdCl::AsyncSocketHandler::OnReadWhileHandshaking() (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/xrootd/4.12.3/lib64/li\
bXrdCl.so.2.0.0)
==2396841==    by 0x2CB3376C: XrdCl::AsyncSocketHandler::Event(unsigned char, XrdCl::Socket*) (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/xrootd/4.1\
2.3/lib64/libXrdCl.so.2.0.0)
==2396841==

and

==2396841== 832 bytes in 1 blocks are possibly lost in loss record 35,122 of 41,982
==2396841==    at 0x402F9A2: calloc (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/valgrind/3.15.0-bcolbf2/lib/valgrind/vgpreload_memcheck-amd64-linux.\
so)
==2396841==    by 0x4012784: _dl_allocate_tls (in /usr/lib64/ld-2.17.so)
==2396841==    by 0x4C3987B: pthread_create@@GLIBC_2.2.5 (in /usr/lib64/libpthread-2.17.so)
==2396841==    by 0x2CAD9358: XrdCl::TaskManager::Start() (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/xrootd/4.12.3/lib64/libXrdCl.so.2.0.0)
==2396841==    by 0x2CAC7E58: XrdCl::PostMaster::Start() (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/xrootd/4.12.3/lib64/libXrdCl.so.2.0.0)
==2396841==    by 0x2CAB5FB7: XrdCl::DefaultEnv::GetPostMaster() (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/xrootd/4.12.3/lib64/libXrdCl.so.2.0.0)
==2396841==    by 0x2CB5ABE6: XrdCl::LocalFileHandler::LocalFileHandler() (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/xrootd/4.12.3/lib64/libXrdCl.s\
o.2.0.0)
==2396841==    by 0x2CB0343B: XrdCl::FileStateHandler::FileStateHandler() (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/xrootd/4.12.3/lib64/libXrdCl.s\
o.2.0.0)
==2396841==    by 0x2CAFD895: XrdCl::File::File(bool) (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/external/xrootd/4.12.3/lib64/libXrdCl.so.2.0.0)
==2396841==    by 0x2C91BAA4: TNetXNGFile::TNetXNGFile(char const*, char const*, char const*, char const*, int, int, bool) (in /cvmfs/cms.cern.ch/slc7_amd\
64_gcc900/lcg/root/6.22.06-ljfedo2/lib/libNetxNG.so)
==2396841==    by 0x2C91C60B: TNetXNGFile::TNetXNGFile(char const*, char const*, char const*, int, int, bool) (in /cvmfs/cms.cern.ch/slc7_amd64_gcc900/lcg\
/root/6.22.06-ljfedo2/lib/libNetxNG.so)
==2396841==    by 0x2CC0F612: ???
==2396841==

I also uploaded the full log here: https://cernbox.cern.ch/index.php/s/ztbGo5drEuuOuNA

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