[GEDI] Unexpected libgfapi behaviour

[Denis Chaplygin]

Hello!

I observe a weird behavior of glfs_init call. I'm using it in the following
way:

        fs = self._glfs_new(path)
        ret = self._glfs_set_volfile_server(fs, "tcp",
                                            address,
self.GLUSTER_DEFAULT_PORT)
        if ret == -1:
            err = ctypes.get_errno()
            raise IOError(
                "glfs_set_volfile_server failed: %s" % os.strerror(err))

        ret = self._glfs_init(fs)
        if ret == -1:
            err = ctypes.get_errno()
            raise IOError(
                "glfs_init failed: %s" % os.strerror(err))
        self.fs = fs


The code above is in Python and libgfapi is used via cpython using
following definitions:

   # C function prototypes for using the library gfapi
    _lib = ctypes.CDLL("libgfapi.so.0", use_errno=True)

    _glfs_new = ctypes.CFUNCTYPE(
        ctypes.c_void_p, ctypes.c_char_p)(('glfs_new', _lib))

    _glfs_set_volfile_server = ctypes.CFUNCTYPE(
        ctypes.c_int,
        ctypes.c_void_p,
        ctypes.c_char_p,
        ctypes.c_char_p,
        ctypes.c_int)(('glfs_set_volfile_server', _lib))

    _glfs_init = ctypes.CFUNCTYPE(
        ctypes.c_int, ctypes.c_void_p)(('glfs_init', _lib))

Address is 'brq-gluster01.rhev.lab.eng.brq.redhat.com' and path is
'/testiso'. Volume is up and running:

Status of volume: testiso
Gluster process                             TCP Port  RDMA Port  Online  Pid
------------------------------------------------------------------------------
Brick brq-gluster01.rhev.lab.eng.brq.redhat
.com:/data/testiso/brick1/brick             49152     0          Y
13641
Brick brq-gluster02.rhev.lab.eng.brq.redhat
.com:/data/testiso/brick1/brick             49152     0          Y
13519
Brick brq-gluster03.rhev.lab.eng.brq.redhat
.com:/data/testiso/brick1/brick             49152     0          Y
23145
Self-heal Daemon on localhost               N/A       N/A        Y
24975
Self-heal Daemon on brq-gluster02.rhev.lab.
eng.brq.redhat.com                          N/A       N/A        Y
23572
Self-heal Daemon on brq-gluster03.rhev.lab.
eng.brq.redhat.com                          N/A       N/A        Y
24603

Task Status of Volume testiso
------------------------------------------------------------------------------
There are no active volume tasks


The problem is that glfs_init call fail with return value of '-1' and errno
set to 0. There is nothing in logs on the gluster side. I also tried
running it with strace, nothing suspicious - connection to glusterd is
established successfully, there is some data transfer followed by load of
several translators.

The questions is  - what can be wrong and how to debug it?

Gluster version is 3.12.1-2.el7 on both client and server side.
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