Unexpected Error: SSL: DECRYPTION_FAILED_OR_BAD_RECORD_MAC

[laydros]

Describe the bug Unexpected Error dialog pops up when syncing with GUI running

To Reproduce Seems to happen while syncing

Expected behaviour Sync to completion without errors

System:

• Maestral version: 1.5.0
• Python version: 3.9.7
• OS: Manjaro, kernel 5.14.10-1
• Desktop environment: Plasma 5.22.5, Framework 5.86.0, Qt 5.15.2
• PyQt version (for Linux GUI): 5.15.4

Additional context

Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/urllib3/response.py", line 441, in _error_catcher
    yield
  File "/usr/lib/python3.9/site-packages/urllib3/response.py", line 522, in read
    data = self._fp.read(amt) if not fp_closed else b""
  File "/usr/lib/python3.9/http/client.py", line 462, in read
    n = self.readinto(b)
  File "/usr/lib/python3.9/http/client.py", line 506, in readinto
    n = self.fp.readinto(b)
  File "/usr/lib/python3.9/socket.py", line 704, in readinto
    return self._sock.recv_into(b)
  File "/usr/lib/python3.9/ssl.py", line 1241, in recv_into
    return self.read(nbytes, buffer)
  File "/usr/lib/python3.9/ssl.py", line 1099, in read
    return self._sslobj.read(len, buffer)
ssl.SSLError: [SSL: DECRYPTION_FAILED_OR_BAD_RECORD_MAC] decryption failed or bad record mac (_ssl.c:2633)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/laydros/.local/lib/python3.9/site-packages/maestral/manager.py", line 791, in _handle_sync_thread_errors
    yield
  File "/home/laydros/.local/lib/python3.9/site-packages/maestral/manager.py", line 769, in startup_worker
    self.sync.download_sync_cycle(client)
  File "/home/laydros/.local/lib/python3.9/site-packages/maestral/sync.py", line 2836, in download_sync_cycle
    downloaded = self.apply_remote_changes(changes)
  File "/home/laydros/.local/lib/python3.9/site-packages/maestral/sync.py", line 3004, in apply_remote_changes
    for n, r in enumerate(res):
  File "/usr/lib/python3.9/concurrent/futures/_base.py", line 608, in result_iterator
    yield fs.pop().result()
  File "/usr/lib/python3.9/concurrent/futures/_base.py", line 438, in result
    return self.__get_result()
  File "/usr/lib/python3.9/concurrent/futures/_base.py", line 390, in __get_result
    raise self._exception
  File "/usr/lib/python3.9/concurrent/futures/thread.py", line 52, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/home/laydros/.local/lib/python3.9/site-packages/maestral/sync.py", line 3328, in _create_local_entry
    res = self._on_remote_file(event, client)
  File "/home/laydros/.local/lib/python3.9/site-packages/maestral/sync.py", line 3387, in _on_remote_file
    md = client.download(f"rev:{event.rev}", tmp_fname, sync_event=event)
  File "/home/laydros/.local/lib/python3.9/site-packages/maestral/client.py", line 623, in download
    for c in http_resp.iter_content(chunksize):
  File "/usr/lib/python3.9/site-packages/requests/models.py", line 758, in generate
    for chunk in self.raw.stream(chunk_size, decode_content=True):
  File "/usr/lib/python3.9/site-packages/urllib3/response.py", line 579, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "/usr/lib/python3.9/site-packages/urllib3/response.py", line 544, in read
    raise IncompleteRead(self._fp_bytes_read, self.length_remaining)
  File "/usr/lib/python3.9/contextlib.py", line 137, in __exit__
    self.gen.throw(typ, value, traceback)
  File "/usr/lib/python3.9/site-packages/urllib3/response.py", line 452, in _error_catcher
    raise SSLError(e)
urllib3.exceptions.SSLError: [SSL: DECRYPTION_FAILED_OR_BAD_RECORD_MAC] decryption failed or bad record mac (_ssl.c:2633)

[samschott]

Thanks for the report! This is a strange one. How reproducible is the error? I.e., does it reoccur after restarting Maestral? And do any other programs report similar issues when downloading larger files (wget, web browser, etc)?

[laydros]

I stopped and restarted Maestral and it happened again after a few minutes. Since it looked like a few more files completed in the meantime, I stopped and started again. Then everything finished. So that's good news for me, but bad news for tracing the bug.

This was on a Manjaro system, I'm also planning to set up maestral on a Debian computer soon, I'll report back if I get anything similar.

No other programs reported similar errors.