Gluster users - Mar 2019 - geo-replication - OSError: [Errno 1] Operation not permitted - failing with socket files?

Hi,

i am trying to understand why georeplciation during "History Crawl"
starts
failing on each of the three bricks, one after the other. I have enabled
DEBUG for all the logs configurable by the geo-replication command.

Running glusterfs v4.16 the behaviour is as follow:
- The "History Crawl" worked fine for about one hr, it actually
replicated
some files and folders albeit most of them looks empty
- at some point it starts becoming faulty, try to start on another brick,
faulty and so on
- in the logs, Python exception above mentioned is raised:
[2019-03-17 18:52:49.565040] E [syncdutils(worker
/var/lib/heketi/mounts/vg_b088aec908c959c75674e01fb8598c21/brick_f90f425ecb89c3eec6ef2ef4a2f0a973/brick):332:log_raise_exception]
<top>:
FAIL:

Traceback (most recent call last):
  File "/usr/libexec/glusterfs/python/syncdaemon/gsyncd.py", line 311,
in
main
    func(args)
  File "/usr/libexec/glusterfs/python/syncdaemon/subcmds.py", line 72,
in
subcmd_worker
    local.service_loop(remote)
  File "/usr/libexec/glusterfs/python/syncdaemon/resource.py", line
1291,
in service_loop
    g3.crawlwrap(oneshot=True)
  File "/usr/libexec/glusterfs/python/syncdaemon/master.py", line 615,
in
crawlwrap
    self.crawl()
  File "/usr/libexec/glusterfs/python/syncdaemon/master.py", line
1569, in
crawl
    self.changelogs_batch_process(changes)
  File "/usr/libexec/glusterfs/python/syncdaemon/master.py", line
1469, in
changelogs_batch_process
    self.process(batch)
  File "/usr/libexec/glusterfs/python/syncdaemon/master.py", line
1304, in
process
    self.process_change(change, done, retry)
  File "/usr/libexec/glusterfs/python/syncdaemon/master.py", line
1203, in
process_change
    failures = self.slave.server.entry_ops(entries)
  File "/usr/libexec/glusterfs/python/syncdaemon/repce.py", line 216,
in
__call__
    return self.ins(self.meth, *a)
  File "/usr/libexec/glusterfs/python/syncdaemon/repce.py", line 198,
in
__call__
    raise res
OSError: [Errno 1] Operation not permitted

- The operation before the exception:
[2019-03-17 18:52:49.545103] D [master(worker
/var/lib/heketi/mounts/vg_b088aec908c959c75674e01fb8598c21/brick_f90f425ecb89c3eec6ef2ef4a2f0a973/brick):1186:process_change]
_GMaster: entries: [{'uid': 7575, 'gfid':
'e1ad7c98-f32a-4e48-9902-cc75840de7c3', 'gid': 100,
'mode'
: 49536, 'entry':
'.gfid/5219e4b8-a1f3-4a4e-b9c7-c9b129abe671/.control_f7c33270dc9db9234d005406a13deb4375459715.6lvofzOuVnfAwOwY',
'op': 'MKNOD'}, {'gfid':
'e1ad7c98-f32a-4e48-9902-cc75840de7c3', 'entry':
'.gfid/5219e4b8-a1f3-4a4e-b9c7-c9b129abe671/.control_f7c33270dc9db9
234d005406a13deb4375459715', 'stat': {'atime':
1552661403.3846507, 'gid':
100, 'mtime': 1552661403.3846507, 'uid': 7575, 'mode':
49536}, 'link':
None, 'op': 'LINK'}, {'gfid':
'e1ad7c98-f32a-4e48-9902-cc75840de7c3',
'entry': '.gfid/5219e4b8-a1f3-4a4e-b9c7-c9b129abe671/.con
trol_f7c33270dc9db9234d005406a13deb4375459715.6lvofzOuVnfAwOwY',
'op':
'UNLINK'}]
[2019-03-17 18:52:49.548614] D [repce(worker
/var/lib/heketi/mounts/vg_b088aec908c959c75674e01fb8598c21/brick_f90f425ecb89c3eec6ef2ef4a2f0a973/brick):179:push]
RepceClient: call 56917:140179359156032:1552848769.55 entry_ops([{'uid':
7575, 'gfid': 'e1ad7c98-f32a-4e48-9902-
cc75840de7c3', 'gid': 100, 'mode': 49536, 'entry':
'.gfid/5219e4b8-a1f3-4a4e-b9c7-c9b129abe671/.control_f7c33270dc9db9234d005406a13deb4375459715.6lvofzOuVnfAwOwY',
'op': 'MKNOD'}, {'gfid':
'*e1ad7c98-f32a-4e48-9902-cc75840de7c3*', 'entry':
'.gfid/5219e4b8-a1f3-4a4e-b9c7-c9b
129abe671/.control_f7c33270dc9db9234d005406a13deb4375459715',
'stat':
{'atime': 1552661403.3846507, 'gid': 100, 'mtime':
1552661403.3846507,
'uid': 7575, 'mode': 49536}, 'link': None, 'op':
'LINK'}, {'gfid':
'e1ad7c98-f32a-4e48-9902-cc75840de7c3', 'entry':
'.gfid/5219e4b8
-a1f3-4a4e-b9c7-c9b129abe671/*.control_f7c33270dc9db9234d005406a13deb4375459715.6lvofzOuVnfAwOwY',
'op'*: 'UNLINK'}],) ...

- The gfid highlighted, is pointing to these control files which are "unix
sockets" as per below:
rw-------  2 pippo users     0 Mar 14 16:32
.control_31c3a99664c1f956f949311e58434037e6a52d22
srw-------  2 pippo users     0 Mar 14 16:33
.control_a9b82937042529bca677b9f43eba9eb02ca7c5ee
srw-------  2 pippo users     0 Mar 14 16:32
.control_f429221460d52570066d9f25521011fe7e081cf5
srw-------  2 pippo users     0 Mar 15 15:50
.control_f7c33270dc9db9234d005406a13deb4375459715

So it seems geo-replicaiton should be at least skipping such file rather
than raising an exception? Am i the first experiencing this behaviour?

thanks in advance
Davide
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