From gvfs bug https://bugzilla.gnome.org/show_bug.cgi?id=747718

Sometimes, randomly, mounting fails with "Invalid argument".

During a successful mount:
parse_nmb: packet id = 14196
nmb packet from 192.168.1.15(35072) header: id=14196 opcode=Query(0) response=Yes
    header: flags: bcast=No rec_avail=Yes rec_des=Yes trunc=No auth=Yes
    header: rcode=0 qdcount=0 ancount=1 nscount=0 arcount=0
    answers: nmb_name=PC<20> rr_type=32 rr_class=1 ttl=259200
    answers   0 char ......   hex 0000C0A8010F
Got a positive name query response from 192.168.1.15 ( 192.168.1.15 )
remove_duplicate_addrs2: looking for duplicate address/port pairs
namecache_store: storing 1 address for pc#20: 192.168.1.15
Adding cache entry with key=[NBT/PC#20] and timeout=[Thu May  7 05:43:56 AM 2015 CDT] (660 seconds ahead)
internal_resolve_name: returning 1 addresses: 192.168.1.15:0 
Connecting to 192.168.1.15 at port 445

During a failed mount:
samba_tevent: EPOLL_CTL_DEL EBADF for fde[0x7f97b000c6f0] mpx_fde[(nil)] fd[12] - disabling
map_errno_from_nt_status: 32 bit codes: code=c0000001
### SMB: do_mount - [smb://pc/share; 0] res = -1, cancelled = 0, errno = [22] 'Invalid argument' 
### SMB: do_mount - (errno != EPERM && errno != EACCES), cancelled = 0, breaking

Full logs to follow.

Thanks