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Hi! Trying to download with 32 parallel (1 thready copy worked) copies on centos 7 with devtoolset 7 enabled i got this:
```
*** Error in `python3': double free or corruption (fasttop): 0x00007fce780022b0 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x81329)[0x7fcf64caa329]
/lib64/libstdc++.so.6(_ZNSs6assignERKSs+0x9e)[0x7fcf5603a07e]
/home/adrian/.local/lib/python3.6/site-packages/pyxrootd/lib64/libXrdCl.so.3(+0x168ff5)[0x7fcf5670dff5]
/home/adrian/.local/lib/python3.6/site-packages/pyxrootd/lib64/libXrdCl.so.3(_ZN5XrdCl14ClassicCopyJob3RunEPNS_19CopyProgressHandlerE+0x245c)[0x7fcf5671d8dc]
/home/adrian/.local/lib/python3.6/site-packages/pyxrootd/lib64/libXrdCl.so.3(+0x15f220)[0x7fcf56704220]
/home/adrian/.local/lib/python3.6/site-packages/pyxrootd/lib64/libXrdCl.so.3(_ZN5XrdCl10JobManager7RunJobsEv+0x9d)[0x7fcf56737e6d]
/home/adrian/.local/lib/python3.6/site-packages/pyxrootd/lib64/libXrdCl.so.3(+0x192ee9)[0x7fcf56737ee9]
/lib64/libpthread.so.0(+0x7ea5)[0x7fcf65707ea5]
/lib64/libc.so.6(clone+0x6d)[0x7fcf64d27b0d]
```
full log https://asevcenc.web.cern.ch/asevcenc/xrootd_python_2free/error.txt

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