root master, xrootd-5.3.0
To reproduce: TFile::Open("root://....."), then .q root.
Also opened as issue in root git: https://github.com/root-project/root/issues/8767
I can try reproducing this with a minimal c++ program.
```
0x00007ffff74b1a66 in pthread_rwlock_rdlock () from /lib64/libpthread.so.0
(gdb) bt
#0 0x00007ffff74b1a66 in pthread_rwlock_rdlock () from /lib64/libpthread.so.0
#1 0x00007fffe91ecd62 in XrdCl::Env::GetInt(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int&) ()
from /lib64/libXrdCl.so.3
#2 0x00007fffe9207a39 in XrdCl::PostMaster::PostMaster() () from /lib64/libXrdCl.so.3
#3 0x00007fffe91fed5e in XrdCl::DefaultEnv::GetPostMaster() () from /lib64/libXrdCl.so.3
#4 0x00007fffe9245fc5 in XrdCl::FileStateHandler::~FileStateHandler() () from /lib64/libXrdCl.so.3
#5 0x00007fffe9243bd0 in XrdCl::File::~File() () from /lib64/libXrdCl.so.3
#6 0x00007fffe9243c6d in XrdCl::File::~File() () from /lib64/libXrdCl.so.3
#7 0x00007fffef69630f in TNetXNGFile::~TNetXNGFile (this=0x2019f20, __in_chrg=<optimized out>)
at /home/matevz/root-dev/dev-1/net/netxng/src/TNetXNGFile.cxx:233
#8 0x00007fffef696396 in TNetXNGFile::~TNetXNGFile (this=0x2019f20, __in_chrg=<optimized out>)
at /home/matevz/root-dev/dev-1/net/netxng/src/TNetXNGFile.cxx:236
#9 0x00007ffff7bc5ad3 in TCollection::GarbageCollect (obj=0x2019f20) at /home/matevz/root-dev/dev-1/core/cont/src/TCollection.cxx:736
#10 0x00007ffff7bcdbe5 in TList::Delete (this=0x4307c0, option=0x7ffff7e1726b "slow") at /home/matevz/root-dev/dev-1/core/cont/src/TList.cxx:508
#11 0x00007ffff7af756b in TROOT::~TROOT (this=0x7ffff7f5a900 <ROOT::Internal::GetROOT1()::alloc>, __in_chrg=<optimized out>)
at /home/matevz/root-dev/dev-1/core/base/src/TROOT.cxx:889
#12 0x00007ffff7af4f5f in at_exit_of_TROOT () at /home/matevz/root-dev/dev-1/core/base/src/TROOT.cxx:290
#13 0x00007ffff7317247 in __run_exit_handlers () from /lib64/libc.so.6
#14 0x00007ffff73173f0 in exit () from /lib64/libc.so.6
#15 0x00007ffff7c91627 in TUnixSystem::Exit (this=0x42a800, code=0, mode=true) at /home/matevz/root-dev/dev-1/core/unix/src/TUnixSystem.cxx:2157
#16 0x00007ffff7b0cc16 in TApplication::Terminate (this=0x482000, status=0) at /home/matevz/root-dev/dev-1/core/base/src/TApplication.cxx:1672
#17 0x00007ffff7facf9d in TRint::Terminate (this=0x482000, status=0) at /home/matevz/root-dev/dev-1/core/rint/src/TRint.cxx:696
#18 0x00007ffff7b0b37d in TApplication::ProcessLine (this=0x482000, line=0x7fffffffb589 ".q", sync=false, err=0x7fffffffb51c)
at /home/matevz/root-dev/dev-1/core/base/src/TApplication.cxx:1334
#19 0x00007ffff7fad334 in TRint::ProcessLineNr (this=0x482000, filestem=0x7ffff7fbd6cf "ROOT_prompt_", line=0x7fffffffb589 ".q", error=0x7fffffffb51c)
at /home/matevz/root-dev/dev-1/core/rint/src/TRint.cxx:766
#20 0x00007ffff7facab4 in TRint::HandleTermInput (this=0x482000) at /home/matevz/root-dev/dev-1/core/rint/src/TRint.cxx:612
#21 0x00007ffff7faa5c5 in TTermInputHandler::Notify (this=0x1381dc0) at /home/matevz/root-dev/dev-1/core/rint/src/TRint.cxx:132
#22 0x00007ffff7fae98f in TTermInputHandler::ReadNotify (this=0x1381dc0) at /home/matevz/root-dev/dev-1/core/rint/src/TRint.cxx:124
#23 0x00007ffff7c8fa8a in TUnixSystem::CheckDescriptors (this=0x42a800) at /home/matevz/root-dev/dev-1/core/unix/src/TUnixSystem.cxx:1322
#24 0x00007ffff7c8eec6 in TUnixSystem::DispatchOneEvent (this=0x42a800, pendingOnly=false)
at /home/matevz/root-dev/dev-1/core/unix/src/TUnixSystem.cxx:1077
#25 0x00007ffff7b7e773 in TSystem::InnerLoop (this=0x42a800) at /home/matevz/root-dev/dev-1/core/base/src/TSystem.cxx:406
#26 0x00007ffff7b7e519 in TSystem::Run (this=0x42a800) at /home/matevz/root-dev/dev-1/core/base/src/TSystem.cxx:356
#27 0x00007ffff7b0c963 in TApplication::Run (this=0x482000, retrn=false) at /home/matevz/root-dev/dev-1/core/base/src/TApplication.cxx:1604
#28 0x00007ffff7fabddd in TRint::Run (this=0x482000, retrn=false) at /home/matevz/root-dev/dev-1/core/rint/src/TRint.cxx:463
#29 0x00000000004011e8 in main (argc=1, argv=0x7fffffffda28) at /home/matevz/root-dev/dev-1/main/src/rmain.cxx:30
```
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