https://bugs.kde.org/show_bug.cgi?id=384215
Bug ID: 384215
Summary: Short freezes with KDE applications when sharing
directories via Samba
Product: frameworks-kio
Version: unspecified
Platform: openSUSE RPMs
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: fa...@kde.org
Reporter: teu...@gmail.com
CC: kdelibs-b...@kde.org
Target Milestone: ---
System: Opensuse Leap 42.2 & plasmashell 5.8.6
Applications that depend on KDE libs/framework, suffer from freezes during
fileactivity when sharing directories and a Samba server is running.
During those freezes the network interface is flooded with DNS requests trying
to resolve the hostname of the system.
How to reproduce:
In Yast2, enable/setup a Samba server. Startup -> During Boot. Shares ->
Disable all available shares. Check Allow Users to Share Directories. Check
Allow Guest Access.
In Dolphin, select a couple of directories to share. Rightclick on it and
select Properties -> Share. Check Share with Samba. Check Allow Guests.
Reboot.
Start Wireshark and filter on DNS packets only.
Start a couple of KDE-libs dependent applications like Kate (preferably with th
filesystem browser plugin activated), Okular, Dolphin, and perform some file
manipulations (copy/edit/save).
Look what happens in Wireshark.
A temporary workaround is to open Yast2 -> System -> Network Settings ->
Hostname/DNS and check Assign Hostname to Loopback IP.
It will make the desktop usable again but still not snappy.
For a snappy KDE experience, you can't share directories using the above setup.
What did I expect: to have a snappy/responsive desktop when sharing directories
using a Samba server.
Here's some output of Wireshark:
No. Time Source Destination Protocol
Length Info
1 0.000000000 192.168.1.2 192.168.1.1 DNS 73
Standard query 0x53ae A cetriolo.suse
Frame 1: 73 bytes on wire (584 bits), 73 bytes captured (584 bits) on interface
0
Ethernet II, Src: AsustekC_c9:f2:f1 (48:5b:39:c9:f2:f1), Dst: Netgear_7f:3a:10
(28:c6:8e:7f:3a:10)
Internet Protocol Version 4, Src: 192.168.1.2, Dst: 192.168.1.1
User Datagram Protocol, Src Port: 38071, Dst Port: 53
Domain Name System (query)
No. Time Source Destination Protocol
Length Info
2 0.000017735 192.168.1.2 192.168.1.1 DNS 73
Standard query 0xd632 AAAA cetriolo.suse
Frame 2: 73 bytes on wire (584 bits), 73 bytes captured (584 bits) on interface
0
Ethernet II, Src: AsustekC_c9:f2:f1 (48:5b:39:c9:f2:f1), Dst: Netgear_7f:3a:10
(28:c6:8e:7f:3a:10)
Internet Protocol Version 4, Src: 192.168.1.2, Dst: 192.168.1.1
User Datagram Protocol, Src Port: 38071, Dst Port: 53
Domain Name System (query)
No. Time Source Destination Protocol
Length Info
3 0.011026167 192.168.1.1 192.168.1.2 DNS 148
Standard query response 0x53ae No such name A cetriolo.suse SOA
a.root-servers.net
Frame 3: 148 bytes on wire (1184 bits), 148 bytes captured (1184 bits) on
interface 0
Ethernet II, Src: Netgear_7f:3a:10 (28:c6:8e:7f:3a:10), Dst: AsustekC_c9:f2:f1
(48:5b:39:c9:f2:f1)
Internet Protocol Version 4, Src: 192.168.1.1, Dst: 192.168.1.2
User Datagram Protocol, Src Port: 53, Dst Port: 38071
Domain Name System (response)
No. Time Source Destination Protocol
Length Info
4 0.011628077 192.168.1.1 192.168.1.2 DNS 148
Standard query response 0xd632 No such name AAAA cetriolo.suse SOA
a.root-servers.net
Frame 4: 148 bytes on wire (1184 bits), 148 bytes captured (1184 bits) on
interface 0
Ethernet II, Src: Netgear_7f:3a:10 (28:c6:8e:7f:3a:10), Dst: AsustekC_c9:f2:f1
(48:5b:39:c9:f2:f1)
Internet Protocol Version 4, Src: 192.168.1.1, Dst: 192.168.1.2
User Datagram Protocol, Src Port: 53, Dst Port: 38071
Domain Name System (response)
No. Time Source Destination Protocol
Length Info
5 0.011700108 192.168.1.2 192.168.1.1 DNS 68
Standard query 0x8681 A cetriolo
Frame 5: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) on interface
0
Ethernet II, Src: AsustekC_c9:f2:f1 (48:5b:39:c9:f2:f1), Dst: Netgear_7f:3a:10
(28:c6:8e:7f:3a:10)
Internet Protocol Version 4, Src: 192.168.1.2, Dst: 192.168.1.1
User Datagram Protocol, Src Port: 33958, Dst Port: 53
Domain Name System (query)
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