There are several reports on gvfs-smb eating cpu on the gnome/ubuntu/redhat etc bug trackers, https://bugzilla.gnome.org/show_bug.cgi?id=762580 https://bugzilla.redhat.com/show_bug.cgi?id=1303300 https://bugs.launchpad.net/ubuntu/+source/gvfs/+bug/1572260 it's easy to reproduce on Ubuntu Xenial with smbclient (samba 4.3.9) * edit /etc/hosts * add a line "1.2.3.4 BUG" * try to "smbclient -L BUG" -> smbclient hangs and eat CPU, it seems trying to connect in loop to the invalid host Description from the redhat bugzilla about a more standard user situation "I discovered that part of the problem is my ISP. They offer a "feature" to provide customers with a special search site whenever they type an invalid address into their browser. This is implemented on the DNS level. So when gvfs-smb tries to connect to the non-existing host MYGROUP.localdomain, instead of a DNS error my ISP returns the IP of their search site, which gvfs-smb is then trying to connect to and that causes CPU usage to rise to 100%." Reply from one of the gvfs hackers "Thanks for your bug report. It sounds like a bug in samba, because gvfs just call SMBC_opendir_ctx and it hangs there... See backtrace in time of hang: Thanks for your bug report. It sounds like a bug in samba, because gvfs just call SMBC_opendir_ctx and it hangs there... See backtrace in time of hang: ... #1 0x00007fe4b2713d26 in async_connect_send () from /usr/lib64/samba/libsmb-transport-samba4.so #2 0x00007fe4b782df47 in open_socket_out_connected () from /lib64/libsmbconf.so.0 #3 0x00007fe4b5ca8be4 in tevent_common_loop_immediate () from /lib64/libtevent.so.0 #4 0x00007fe4b5cada2e in epoll_event_loop_once () from /lib64/libtevent.so.0 #5 0x00007fe4b5cac137 in std_event_loop_once () from /lib64/libtevent.so.0 #6 0x00007fe4b5ca838d in _tevent_loop_once () from /lib64/libtevent.so.0 #7 0x00007fe4b5ca95ff in tevent_req_poll () from /lib64/libtevent.so.0 #8 0x00007fe4b8ce31ee in tevent_req_poll_ntstatus () from /lib64/libtevent-util.so.0 #9 0x00007fe4b7cb3980 in cli_connect_nb () from /usr/lib64/samba/liblibsmb-samba4.so ..."
*** This bug has been marked as a duplicate of bug 12105 ***
Hmmm. Is it possible this is a duplicate of 12105: https://bugzilla.samba.org/show_bug.cgi?id=12105 Please check the above and report back.