Bug 1303300 - gvfsd-smb-browse causes 100% CPU usage
Summary: gvfsd-smb-browse causes 100% CPU usage
Alias: None
Product: Fedora
Classification: Fedora
Component: samba
Version: 24
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: Guenther Deschner
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2016-01-30 12:49 UTC by Alex Willmy
Modified: 2016-12-20 18:31 UTC (History)
26 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2016-12-20 18:18:49 UTC
Type: Bug

Attachments (Terms of Use)
Logfile of gvfs (13.97 KB, text/plain)
2016-01-30 12:49 UTC, Alex Willmy
no flags Details

Description Alex Willmy 2016-01-30 12:49:28 UTC
Created attachment 1119633 [details]
Logfile of gvfs

Description of problem:
Whenever I use a file open or save dialog in an application gvfsd-smb-browse causes 100% CPU usage on one of my cores until I kill it manually. I don't have a Windows network, in fact my laptop is the only computer in the local network.

After some investigation 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%.

Version-Release number of selected component (if applicable):

How reproducible:
Every time

Steps to Reproduce:
1. Add an invalid host name entry to /etc/hosts e.g   MYGROUP
2. open gedit
3. click save

To work around this problem, either configure a custom DNS server in network settings (like Google's for example) or simply remove gvfs-smb.

Comment 1 Ondrej Holy 2016-02-01 09:27:36 UTC
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:
Thread 2 (Thread 0x7fe4a1510700 (LWP 30003)):
#0  0x00007fe4b92b5cb7 in fcntl () from /lib64/libpthread.so.0
#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
#10 0x00007fe4bb01a03d in SMBC_server_internal () from /lib64/libsmbclient.so.0
#11 0x00007fe4bb01a95d in SMBC_server () from /lib64/libsmbclient.so.0
#12 0x00007fe4bb0139ef in SMBC_opendir_ctx () from /lib64/libsmbclient.so.0
#13 0x0000000000405cb6 in do_mount (backend=<optimized out>, job=0x8fc2f0, mount_spec=<optimized out>, mount_source=<optimized out>, is_automount=<optimized out>)
    at gvfsbackendsmbbrowse.c:974
#14 0x00007fe4badf176a in g_vfs_job_run (job=0x8fc2f0) at gvfsjob.c:197
#15 0x00007fe4b9748731 in g_thread_pool_thread_proxy (data=0x8ee170) at gthreadpool.c:307
#16 0x00007fe4b9748157 in g_thread_proxy (data=0x7fe49c0044f0) at gthread.c:780
#17 0x00007fe4b92ad60a in start_thread () from /lib64/libpthread.so.0
#18 0x00007fe4b8fe7a4d in clone () from /lib64/libc.so.6

It time outs after several minutes and cpu usage go down...
do_mount - URI = smb://MYGROUP/
do_mount - try #0 
looking up cached server 'MYGROUP'\'IPC$', user 'MYGROUP';'oholy'
  returning (nil)
auth_callback - anonymous pass
auth_callback - out: last_user = 'oholy', last_domain = 'MYGROUP'
looking up cached server 'MYGROUP'\'IPC$', user 'MYGROUP';'oholy'
  returning (nil)
do_mount - [smb://MYGROUP/; 0] dir = (nil), cancelled = 0, errno = [110] 'Connection timed out' 
do_mount - (errno != EPERM && errno != EACCES), cancelled = 0, breaking
send_reply(0x8fc2f0), failed=1 (Failed to retrieve share list from server: Connection timed out)
purging server cache

Let's change the component to samba...

Comment 2 Stefan Hajnoczi 2016-04-08 13:03:49 UTC
I'm experiencing the same problem and also use an ISP that has a landing page for unknown domain names.


The following process consumes 100% CPU:
/usr/libexec/gvfsd-smb-browse --spawner :1.9 /org/gtk/gvfs/exec_spaw/4

Here is the call stack:
Thread 5 (Thread 0x7fd178e13700 (LWP 6358)):
#0  0x00007fd18ee4efdd in poll () at /lib64/libc.so.6
#1  0x00007fd18f58316c in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007fd18f58327c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3  0x00007fd18f5832b9 in glib_worker_main () at /lib64/libglib-2.0.so.0
#4  0x00007fd18f5a9835 in g_thread_proxy () at /lib64/libglib-2.0.so.0
#5  0x00007fd18f12060a in start_thread () at /lib64/libpthread.so.0
#6  0x00007fd18ee5aa4d in clone () at /lib64/libc.so.6
Thread 4 (Thread 0x7fd173fff700 (LWP 6359)):
#0  0x00007fd18ee4efdd in poll () at /lib64/libc.so.6
#1  0x00007fd18f58316c in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007fd18f5834f2 in g_main_loop_run () at /lib64/libglib-2.0.so.0
#3  0x00007fd18fba4336 in gdbus_shared_thread_func () at /lib64/libgio-2.0.so.0
#4  0x00007fd18f5a9835 in g_thread_proxy () at /lib64/libglib-2.0.so.0
#5  0x00007fd18f12060a in start_thread () at /lib64/libpthread.so.0
#6  0x00007fd18ee5aa4d in clone () at /lib64/libc.so.6
Thread 3 (Thread 0x7fd172ffd700 (LWP 6361)):
#0  0x00007fd18ee4efdd in poll () at /lib64/libc.so.6
#1  0x00007fd18f58316c in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007fd18f58327c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3  0x00007fd17840d2ad in dconf_gdbus_worker_thread () at /usr/lib64/gio/modules/libdconfsettings.so
#4  0x00007fd18f5a9835 in g_thread_proxy () at /lib64/libglib-2.0.so.0
#5  0x00007fd18f12060a in start_thread () at /lib64/libpthread.so.0
#6  0x00007fd18ee5aa4d in clone () at /lib64/libc.so.6
Thread 2 (Thread 0x7fd1727fc700 (LWP 6362)):
#0  0x00007fd18f128dfd in connect () at /lib64/libpthread.so.0
#1  0x00007fd1887b6dce in async_connect_send () at /usr/lib64/samba/libsmb-transport-samba4.so
#2  0x00007fd18d6a0f47 in open_socket_out_connected () at /lib64/libsmbconf.so.0
#3  0x00007fd18bb0cbe4 in tevent_common_loop_immediate () at /lib64/libtevent.so.0
#4  0x00007fd18bb11a2e in epoll_event_loop_once () at /lib64/libtevent.so.0
#5  0x00007fd18bb10137 in std_event_loop_once () at /lib64/libtevent.so.0
#6  0x00007fd18bb0c38d in _tevent_loop_once () at /lib64/libtevent.so.0
#7  0x00007fd18bb0d5ff in tevent_req_poll () at /lib64/libtevent.so.0
#8  0x00007fd18eb561ee in tevent_req_poll_ntstatus () at /lib64/libtevent-util.so.0
#9  0x00007fd18db26a60 in cli_connect_nb () at /usr/lib64/samba/liblibsmb-samba4.so
#10 0x00007fd190e4be44 in SMBC_server_internal () at /lib64/libsmbclient.so.0
#11 0x00007fd190e4c95d in SMBC_server () at /lib64/libsmbclient.so.0
#12 0x00007fd190e459ef in SMBC_opendir_ctx () at /lib64/libsmbclient.so.0
#13 0x00005615fc5acf01 in do_mount ()
#14 0x00007fd190c22baa in g_vfs_job_run () at /usr/lib64/gvfs/libgvfsdaemon.so
#15 0x00007fd18f5aa1ce in g_thread_pool_thread_proxy () at /lib64/libglib-2.0.so.0
#16 0x00007fd18f5a9835 in g_thread_proxy () at /lib64/libglib-2.0.so.0
#17 0x00007fd18f12060a in start_thread () at /lib64/libpthread.so.0
#18 0x00007fd18ee5aa4d in clone () at /lib64/libc.so.6
Thread 1 (Thread 0x7fd1911f1840 (LWP 6356)):
#0  0x00007fd18ee4efdd in poll () at /lib64/libc.so.6
#1  0x00007fd18f58316c in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007fd18f5834f2 in g_main_loop_run () at /lib64/libglib-2.0.so.0
#3  0x00005615fc5adcda in daemon_main ()
#4  0x00005615fc5aa99f in main ()

Comment 4 Ondrej Holy 2016-05-10 07:59:50 UTC
It is reproducible even with "smbclient -L MYGROUP". This causes high cpu usage for 2 minutes before "Connection to MYGROUP failed (Error NT_STATUS_IO_TIMEOUT)" is returned. However the error was returned almost immediately and without high cpu load with earlier versions of samba...

(In reply to collura from comment #3)
> the comment at 
> https://ask.fedoraproject.org/en/question/86178/gvfsd-smb-browse-heating-my-
> computer/
> has this as being upstream as:
>    https://bugzilla.gnome.org/show_bug.cgi?id=762580

This upstream report is for Nautilus, however the bug is in samba, can you please file a bug report on bugzilla.samba.org?

Comment 5 collura 2016-05-11 22:12:22 UTC
from comment#4 upstream filing a request for SMBC_opendir_ctx:

  looks like it might already be there as


Comment 6 Ondrej Holy 2016-05-12 08:11:10 UTC
The bug you mentioned is definitely something else. It is about crashes, not hangs and the backtrace is totally different.

Comment 7 seeker_moc 2016-05-20 18:10:07 UTC
I'm also experiencing the same bug when using a public wifi service that has a captive portal login. I never had this problem on my home internet connection. Running "smbclient -L MYGROUP" also gives me a couple of minutes of 100% CPU on a second core. After smbclient exits with timeout error the gvfsd-smb-browse process continues to take 100% for another few minutes, then eventually stops itself as well.

Comment 8 Brett Bogert 2016-06-04 20:40:24 UTC
I was also experiencing this bug in Ubuntu 16.04 and was able to reproduce
it in Fedora 24 Beta. After doing some research and troubleshooting I was
able to come up with the following workaround(fix ?).

This bug is being tracked in Ubuntu under launchpad bug #1409032 for

Note: This change only addresses the 100% CPU usage when opening
the Nautilus file browser after a initial boot or reboot. I am 
not sure what other issues with gvfsd-smb-browse and 100% CPU
usage this may impact so your experience may vary.

1- Make a back up of your /etc/samba/smb.conf file.

2- Using your preferred editor edit the smb.conf file and
add the following line below the "[global]" statement:

name resolve order = wins lmhosts bcast

Your file should look like this:

name resolve order = wins lmhosts bcast

3- Save the file and reboot.

This should resolve the 100% CPU usage problem and you should notice
that the "Network" Icon and label should appear in your file browser
much quicker that before.

I was only able to test this workaround/fix in Ubuntu 16.04 as I
could not find up to date information on how to restart the samba
service in Fedora 24(I tried both /sbin/service and systemctl
commands but they did not work).

If someone can test this on Fedora 24 I would appreciate it (Note it
requires an active internet connection to reproduce the problem).

Hope this helps

Comment 9 seeker_moc 2016-06-05 01:06:51 UTC
I can confirm this prevents the 100% CPU issue from occurring on Fedora 24. However, I am not currently at a location with an available Samba share, so I can't test to confirm whether this potentially breaks any kind of expected functionality.

Comment 10 Paul Gier 2016-08-22 15:24:00 UTC
Brett's fix (comment#8) seems to fix the issue for me on Fedora 24.  And I am able to access a windows share after changing my smb.conf file and rebooting.

Comment 11 Fedora End Of Life 2016-11-24 15:17:31 UTC
This message is a reminder that Fedora 23 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
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bug reports from releases that are no longer maintained. At that time
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Comment 12 Andreas Schneider 2016-11-25 08:53:45 UTC
Does the problem still occur on F25?

Comment 13 David Strauss 2016-11-27 02:34:32 UTC
This problem certainly occurs still on F24. I haven't tried on F25.

Comment 14 Fedora End Of Life 2016-12-20 18:18:49 UTC
Fedora 23 changed to end-of-life (EOL) status on 2016-12-20. Fedora 23 is
no longer maintained, which means that it will not receive any further
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