abderrahim opened a new issue, #1842:
URL: https://github.com/apache/buildstream/issues/1842

   When building with remote execution, I get the following error. I don't know 
if it's consistent, but retrying once gives the same error. 
   
   ```
   [16:35:19][00:11:56][e8a2758a][   build:bootstrap/build/gcc-stage1.bst] BUG  
   Build
   
       An unhandled exception occured:
       
       Traceback (most recent call last):
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/_scheduler/jobs/job.py",
 line 438, in child_action
           result = self.child_process()  # pylint: 
disable=assignment-from-no-return
                    ^^^^^^^^^^^^^^^^^^^^
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/_scheduler/jobs/elementjob.py",
 line 91, in child_process
           return self._action_cb(self._element)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/_scheduler/queues/buildqueue.py",
 line 55, in _assemble_element
           element._assemble()
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/element.py",
 line 1689, in _assemble
           collect = self.assemble(sandbox)  # pylint: 
disable=assignment-from-no-return
                     ^^^^^^^^^^^^^^^^^^^^^^
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/buildelement.py",
 line 315, in assemble
           with sandbox.batch(root_read_only=True, label="Running commands"):
         File "/usr/lib/python3.11/contextlib.py", line 144, in __exit__
           next(self.gen)
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/sandbox/sandbox.py",
 line 265, in batch
           batch.execute()
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/sandbox/_sandboxreapi.py",
 line 234, in execute
           self.sandbox._run_with_flags(
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/sandbox/sandbox.py",
 line 374, in _run_with_flags
           return self._run(command, flags=flags, cwd=cwd, env=env)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/sandbox/_sandboxreapi.py",
 line 101, in _run
           action_result = self._execute_action(action, flags)  # pylint: 
disable=assignment-from-no-return
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/sandbox/_sandboxremote.py",
 line 221, in _execute_action
           cascache.pull_tree(casremote, tree_digest)
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/_cas/cascache.py",
 line 278, in pull_tree
           digest = self._fetch_tree(remote, digest)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/_cas/cascache.py",
 line 644, in _fetch_tree
           dirdigests = self.add_objects(buffers=dirbuffers)
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/_cas/cascache.py",
 line 370, in add_objects
           tmp = stack.enter_context(self._temporary_object())
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
         File "/usr/lib/python3.11/contextlib.py", line 505, in enter_context
           result = _enter(cm)
                    ^^^^^^^^^^
         File "/usr/lib/python3.11/contextlib.py", line 137, in __enter__
           return next(self.gen)
                  ^^^^^^^^^^^^^^
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/_cas/cascache.py",
 line 595, in _temporary_object
           with utils._tempnamedfile(dir=self.tmpdir) as f:
         File "/usr/lib/python3.11/contextlib.py", line 137, in __enter__
           return next(self.gen)
                  ^^^^^^^^^^^^^^
         File 
"/home/abderrahimkitouni/.local/pipx/venvs/buildstream/lib/python3.11/site-packages/buildstream/utils.py",
 line 1268, in _tempnamedfile
           with _signals.terminator(close_tempfile), 
tempfile.NamedTemporaryFile(
                                                     
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
         File "/usr/lib/python3.11/tempfile.py", line 702, in NamedTemporaryFile
           file = _io.open(dir, mode, buffering=buffering,
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
         File "/usr/lib/python3.11/tempfile.py", line 699, in opener
           fd, name = _mkstemp_inner(dir, prefix, suffix, flags, output_type)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
         File "/usr/lib/python3.11/tempfile.py", line 395, in _mkstemp_inner
           fd = _os.open(file, flags, 0o600)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       OSError: [Errno 24] Too many open files: 
'/home/abderrahimkitouni/.cache/buildstream/tmp/tmpr9a6fdwb'
   ```


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