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Hello,

I know this one sounds very specific but bear with me :)
Initially tracked here (DMC-1285).

When calling gfal-copy (with ProgressBar) against a TLS XRootd Storage, the XRootD client will enter a loop, caused by the XrdClForkHandler. The ProgressBar, which spawns a Python thread of its own, is a necessary step to trigger this.

It might be the additional thread puts the XrdClForkHandler in a bad state, causing the loop.

How to reproduce:

$ XRD_RUNFORKHANDLER=1 gfal-copy /tmp/file root://osggridftp01.slac.stanford.edu:2094/<path>

From XRootd v5.2.0, the XrdClForkHandler is enabled by default

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