I use s3ql-2.9.1 in Fedora 20 packages with OpenStack Swift (/v1) as
backed storage.
s3ql crash often.

Below the log when s3ql is crashed.

Is it a bug of s3ql?

-----
2014-08-06 17:19:09.067 [pid=674, thread='Thread-6', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
404, in _upload_loop
    self._do_upload(*tmp)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
431, in _do_upload
    % obj_id).get_obj_size()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 321, in perform_write
    return fn(fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 768, in __exit__
    self.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 762, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 934, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/s3c.py", line
758, in close
    headers=self.headers, body=self.fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
214, in _do_request
    shutil.copyfileobj(body, self.conn, BUFSIZE)
  File "/usr/lib64/python3.3/shutil.py", line 71, in copyfileobj
    fdst.write(buf)
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 592,
in write
    eval_coroutine(self.co_write(buf))
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 1309,
in eval_coroutine
    assert next(crt).poll()
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 604,
in co_write
    raise StateError('No active request with pending body data')
dugong.StateError: No active request with pending body data
2014-08-06 17:19:09.108 [pid=674, thread='Thread-5',
module='s3ql.mount', fn='exchook', line=698]: Unhandled top-level
exception during shutdown (will not be re-raised)
2014-08-06 17:19:09.159 [pid=674, thread='Thread-10',
module='s3ql.mount', fn='exchook', line=698]: Unhandled top-level
exception during shutdown (will not be re-raised)
2014-08-06 17:19:09.210 [pid=674, thread='Thread-7',
module='s3ql.mount', fn='exchook', line=698]: Unhandled top-level
exception during shutdown (will not be re-raised)
2014-08-06 17:19:09.264 [pid=674, thread='Thread-11',
module='s3ql.backends.swift', fn='_do_request', line=233]: OpenStack
auth token seems to have expired, requesting new one.
2014-08-06 17:19:09.267 [pid=674, thread='Thread-5', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
404, in _upload_loop
    self._do_upload(*tmp)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
431, in _do_upload
    % obj_id).get_obj_size()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 321, in perform_write
    return fn(fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 768, in __exit__
    self.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 762, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 934, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/s3c.py", line
758, in close
    headers=self.headers, body=self.fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
214, in _do_request
    shutil.copyfileobj(body, self.conn, BUFSIZE)
  File "/usr/lib64/python3.3/shutil.py", line 71, in copyfileobj
    fdst.write(buf)
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 592,
in write
    eval_coroutine(self.co_write(buf))
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 1309,
in eval_coroutine
    assert next(crt).poll()
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 604,
in co_write
    raise StateError('No active request with pending body data')
dugong.StateError: No active request with pending body data
2014-08-06 17:19:09.272 [pid=674, thread='Thread-19',
module='s3ql.backends.swift', fn='_do_request', line=233]: OpenStack
auth token seems to have expired, requesting new one.
2014-08-06 17:19:09.286 [pid=674, thread='Thread-10', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
404, in _upload_loop
    self._do_upload(*tmp)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
431, in _do_upload
    % obj_id).get_obj_size()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 321, in perform_write
    return fn(fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 768, in __exit__
    self.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 762, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 934, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/s3c.py", line
758, in close
    headers=self.headers, body=self.fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
214, in _do_request
    shutil.copyfileobj(body, self.conn, BUFSIZE)
  File "/usr/lib64/python3.3/shutil.py", line 71, in copyfileobj
    fdst.write(buf)
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 592,
in write
    eval_coroutine(self.co_write(buf))
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 1309,
in eval_coroutine
    assert next(crt).poll()
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 604,
in co_write
    raise StateError('No active request with pending body data')
dugong.StateError: No active request with pending body data
2014-08-06 17:19:09.288 [pid=674, thread='Thread-7', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
404, in _upload_loop
    self._do_upload(*tmp)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
431, in _do_upload
    % obj_id).get_obj_size()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 321, in perform_write
    return fn(fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 768, in __exit__
    self.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 762, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 934, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/s3c.py", line
758, in close
    headers=self.headers, body=self.fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
214, in _do_request
    shutil.copyfileobj(body, self.conn, BUFSIZE)
  File "/usr/lib64/python3.3/shutil.py", line 71, in copyfileobj
    fdst.write(buf)
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 592,
in write
    eval_coroutine(self.co_write(buf))
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 1309,
in eval_coroutine
    assert next(crt).poll()
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 604,
in co_write
    raise StateError('No active request with pending body data')
dugong.StateError: No active request with pending body data
2014-08-06 17:19:13.481 [pid=674, thread='Thread-4',
module='s3ql.mount', fn='exchook', line=698]: Unhandled top-level
exception during shutdown (will not be re-raised)
2014-08-06 17:19:13.482 [pid=674, thread='Thread-4', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
404, in _upload_loop
    self._do_upload(*tmp)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
431, in _do_upload
    % obj_id).get_obj_size()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 321, in perform_write
    return fn(fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 768, in __exit__
    self.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 762, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 934, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/s3c.py", line
758, in close
    headers=self.headers, body=self.fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
214, in _do_request
    shutil.copyfileobj(body, self.conn, BUFSIZE)
  File "/usr/lib64/python3.3/shutil.py", line 71, in copyfileobj
    fdst.write(buf)
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 592,
in write
    eval_coroutine(self.co_write(buf))
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 1309,
in eval_coroutine
    assert next(crt).poll()
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 604,
in co_write
    raise StateError('No active request with pending body data')
dugong.StateError: No active request with pending body data
2014-08-06 17:19:13.519 [pid=674, thread='Thread-3',
module='s3ql.mount', fn='exchook', line=698]: Unhandled top-level
exception during shutdown (will not be re-raised)
2014-08-06 17:19:13.519 [pid=674, thread='Thread-3', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
404, in _upload_loop
    self._do_upload(*tmp)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
431, in _do_upload
    % obj_id).get_obj_size()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 321, in perform_write
    return fn(fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 768, in __exit__
    self.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 762, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 934, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/s3c.py", line
758, in close
    headers=self.headers, body=self.fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
214, in _do_request
    shutil.copyfileobj(body, self.conn, BUFSIZE)
  File "/usr/lib64/python3.3/shutil.py", line 71, in copyfileobj
    fdst.write(buf)
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 592,
in write
    eval_coroutine(self.co_write(buf))
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 1309,
in eval_coroutine
    assert next(crt).poll()
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 604,
in co_write
    raise StateError('No active request with pending body data')
dugong.StateError: No active request with pending body data
2014-08-06 17:19:13.554 [pid=674, thread='Thread-8',
module='s3ql.mount', fn='exchook', line=698]: Unhandled top-level
exception during shutdown (will not be re-raised)
2014-08-06 17:19:13.554 [pid=674, thread='Thread-8', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
404, in _upload_loop
    self._do_upload(*tmp)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
431, in _do_upload
    % obj_id).get_obj_size()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 321, in perform_write
    return fn(fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 768, in __exit__
    self.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 762, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 934, in close
    self.fh.close()
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/s3c.py", line
758, in close
    headers=self.headers, body=self.fh)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
214, in _do_request
    shutil.copyfileobj(body, self.conn, BUFSIZE)
  File "/usr/lib64/python3.3/shutil.py", line 71, in copyfileobj
    fdst.write(buf)
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 592,
in write
    eval_coroutine(self.co_write(buf))
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 1309,
in eval_coroutine
    assert next(crt).poll()
  File "/usr/lib/python3.3/site-packages/dugong/__init__.py", line 604,
in co_write
    raise StateError('No active request with pending body data')
dugong.StateError: No active request with pending body data
2014-08-06 17:19:13.582 [pid=674, thread='Thread-14',
module='s3ql.backends.swift', fn='_do_request', line=233]: OpenStack
auth token seems to have expired, requesting new one.
2014-08-06 17:19:14.212 [pid=674, thread='Thread-12',
module='s3ql.mount', fn='exchook', line=698]: Unhandled top-level
exception during shutdown (will not be re-raised)
2014-08-06 17:19:14.213 [pid=674, thread='Thread-12', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
387, in delete
    resp = self._do_request('DELETE', '/%s%s' % (self.prefix, key))
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
246, in _do_request
    raise HTTPError(resp.status, resp.reason, resp.headers)
s3ql.backends.s3c.HTTPError: 404 Not Found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
674, in _removal_loop
    backend.delete_multi(['s3ql_data_%d' % i for i in ids])
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 705, in delete_multi
    return self.backend.delete_multi(keys, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 452, in delete_multi
    self.delete(key, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
391, in delete
    raise NoSuchObject(key)
s3ql.backends.common.NoSuchObject: Backend does not have anything stored
under key 's3ql_data_228742'
2014-08-06 17:19:14.543 [pid=674, thread='Thread-13',
module='s3ql.mount', fn='exchook', line=698]: Unhandled top-level
exception during shutdown (will not be re-raised)
2014-08-06 17:19:14.545 [pid=674, thread='Thread-13', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
387, in delete
    resp = self._do_request('DELETE', '/%s%s' % (self.prefix, key))
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
246, in _do_request
    raise HTTPError(resp.status, resp.reason, resp.headers)
s3ql.backends.s3c.HTTPError: 404 Not Found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
674, in _removal_loop
    backend.delete_multi(['s3ql_data_%d' % i for i in ids])
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 705, in delete_multi
    return self.backend.delete_multi(keys, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 452, in delete_multi
    self.delete(key, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
391, in delete
    raise NoSuchObject(key)
s3ql.backends.common.NoSuchObject: Backend does not have anything stored
under key 's3ql_data_228743'
2014-08-06 17:19:14.784 [pid=674, thread='Thread-20',
module='s3ql.mount', fn='exchook', line=698]: Unhandled top-level
exception during shutdown (will not be re-raised)
2014-08-06 17:19:14.784 [pid=674, thread='Thread-20', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
387, in delete
    resp = self._do_request('DELETE', '/%s%s' % (self.prefix, key))
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
246, in _do_request
    raise HTTPError(resp.status, resp.reason, resp.headers)
s3ql.backends.s3c.HTTPError: 404 Not Found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
674, in _removal_loop
    backend.delete_multi(['s3ql_data_%d' % i for i in ids])
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 705, in delete_multi
    return self.backend.delete_multi(keys, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 452, in delete_multi
    self.delete(key, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
391, in delete
    raise NoSuchObject(key)
s3ql.backends.common.NoSuchObject: Backend does not have anything stored
under key 's3ql_data_228745'
2014-08-06 17:19:14.849 [pid=674, thread='Thread-15',
module='s3ql.mount', fn='exchook', line=698]: Unhandled top-level
exception during shutdown (will not be re-raised)
2014-08-06 17:19:14.849 [pid=674, thread='Thread-15', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
387, in delete
    resp = self._do_request('DELETE', '/%s%s' % (self.prefix, key))
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
246, in _do_request
    raise HTTPError(resp.status, resp.reason, resp.headers)
s3ql.backends.s3c.HTTPError: 404 Not Found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
674, in _removal_loop
    backend.delete_multi(['s3ql_data_%d' % i for i in ids])
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 705, in delete_multi
    return self.backend.delete_multi(keys, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 452, in delete_multi
    self.delete(key, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
391, in delete
    raise NoSuchObject(key)
s3ql.backends.common.NoSuchObject: Backend does not have anything stored
under key 's3ql_data_228744'
2014-08-06 17:19:15.438 [pid=674, thread='Thread-17',
module='s3ql.mount', fn='exchook', line=698]: Unhandled top-level
exception during shutdown (will not be re-raised)
2014-08-06 17:19:15.439 [pid=674, thread='Thread-17', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
387, in delete
    resp = self._do_request('DELETE', '/%s%s' % (self.prefix, key))
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
246, in _do_request
    raise HTTPError(resp.status, resp.reason, resp.headers)
s3ql.backends.s3c.HTTPError: 404 Not Found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
674, in _removal_loop
    backend.delete_multi(['s3ql_data_%d' % i for i in ids])
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 705, in delete_multi
    return self.backend.delete_multi(keys, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 452, in delete_multi
    self.delete(key, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
391, in delete
    raise NoSuchObject(key)
s3ql.backends.common.NoSuchObject: Backend does not have anything stored
under key 's3ql_data_228747'
2014-08-06 17:19:15.665 [pid=674, thread='Thread-18',
module='s3ql.mount', fn='exchook', line=698]: Unhandled top-level
exception during shutdown (will not be re-raised)
2014-08-06 17:19:15.666 [pid=674, thread='Thread-18', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
387, in delete
    resp = self._do_request('DELETE', '/%s%s' % (self.prefix, key))
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
246, in _do_request
    raise HTTPError(resp.status, resp.reason, resp.headers)
s3ql.backends.s3c.HTTPError: 404 Not Found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
674, in _removal_loop
    backend.delete_multi(['s3ql_data_%d' % i for i in ids])
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 705, in delete_multi
    return self.backend.delete_multi(keys, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 452, in delete_multi
    self.delete(key, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
391, in delete
    raise NoSuchObject(key)
s3ql.backends.common.NoSuchObject: Backend does not have anything stored
under key 's3ql_data_228748'
2014-08-06 17:19:16.494 [pid=674, thread='Thread-16',
module='s3ql.mount', fn='exchook', line=698]: Unhandled top-level
exception during shutdown (will not be re-raised)
2014-08-06 17:19:16.495 [pid=674, thread='Thread-16', module='root',
fn='excepthook', line=163]: Uncaught top-level exception:
Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
387, in delete
    resp = self._do_request('DELETE', '/%s%s' % (self.prefix, key))
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
246, in _do_request
    raise HTTPError(resp.status, resp.reason, resp.headers)
s3ql.backends.s3c.HTTPError: 404 Not Found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib64/python3.3/site-packages/s3ql/mount.py", line 59, in
run_with_except_hook
    run_old(*args, **kw)
  File "/usr/lib64/python3.3/threading.py", line 594, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.3/site-packages/s3ql/block_cache.py", line
674, in _removal_loop
    backend.delete_multi(['s3ql_data_%d' % i for i in ids])
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 705, in delete_multi
    return self.backend.delete_multi(keys, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 452, in delete_multi
    self.delete(key, force=force)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/common.py",
line 58, in wrapped
    return method(*a, **kw)
  File "/usr/lib64/python3.3/site-packages/s3ql/backends/swift.py", line
391, in delete
    raise NoSuchObject(key)
s3ql.backends.common.NoSuchObject: Backend does not have anything stored
under key 's3ql_data_228749'
2014-08-06 17:19:33.096 [pid=674, thread='MainThread',
module='s3ql.mount', fn='unmount', line=168]: Unmounting file system...


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