http://bugzilla.opensuse.org/show_bug.cgi?id=1033229 Bug ID: 1033229 Summary: timeout when accessing disconnected mount.cifs resources Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: x86-64 OS: SUSE Other Status: NEW Severity: Normal Priority: P5 - None Component: Samba Assignee: samba-maintainers@SuSE.de Reporter: haenig@cosifan.de QA Contact: samba-maintainers@SuSE.de Found By: --- Blocker: --- Created attachment 720515 --> http://bugzilla.opensuse.org/attachment.cgi?id=720515&action=edit screenshot of wireshark showing start of disconnect - Tumbleweed I am using several different Linux boxes (openSuSE 13.2, openSuSE Leap 42.2 and openSuSE Tumbleqweed) against a Windows 2008R2 Server mounting and using shares on all systems is done through the same set of commands, e.g. # mount.cifs //windows_host/public2 /mnt/public2 --verbose -o iocharset=iso8859-1,noexec,file_mode=0777,uid=12345,gid=12345,domain=mydomain,credentials=/etc/samba/my_credentials after not accessing any of the files of the public2 resource (for approx. 15 minutes) the Windows's Server Timeout comes to play and the resource disconnects (# cat /proc/fs/cifs/DebugData) whereas the openSuSE Leap 42.2 (as well as the older 13.2) system immediately reconnects if need arises and one does not notice any "after effects", applications in the openSuSE Tumbleweed most of the time simply freeze and after some local timeaout one gets a "resource not available" or similar. a comparision of tcpdumps showed some differences: openSuSE Leap 42.2: - before the disconnect every 60 seconds there is an SMB Echo Request => SMB Echo Response handshake - after the disconnect (until reconnect) every 60 seconds there is a new connection opened by the client and reset by the server (without any SMB related data or packets) - on access to the resource by an application at client side the reconnect seems instantaneous openSuSE Tumbleweed - before the disconnect every 60 seconds there is an SMB Echo Request => SMB Echo Response handshake just like with the other system(s) - but with the disconnect the client initiates roughly 1446 new connections per second containing an SMB Echo Request for which one sees no response from the server. - on access to the resource by an application most of the time one runs againt another timeout / is not able to access the data resting there - in the screenshot from tcpdump/wireshark this lasted approximately 12 seconds during wich time the respective application is of course "frozen". Versions # ---------------------------------------- # openSuSE 13.2 - works # ---------------------------------------- thomas:~ # mount.cifs --version mount.cifs version: 6.4 thomas:~ # rpm -qf /sbin/mount.cifs cifs-utils-6.4-3.4.1.x86_64 # ---------------------------------------- # openSuSE Leap 42.2 - works # ---------------------------------------- vm_test:~ # uname -a Linux vm_test 4.4.57-18.3-default #1 SMP Thu Mar 30 06:39:47 UTC 2017 (39c8557) x86_64 x86_64 x86_64 GNU/Linux vm_test:~ # mount.cifs --version mount.cifs version: 6.5 vm_test:~ # rpm -qf /sbin/mount.cifs cifs-utils-6.5-1.5.x86_64 # ---------------------------------------- # openSuSE Leap Tumbleweed - does NOT work # ---------------------------------------- thomas:~ # uname -a Linux thomas 4.10.8-1-default #1 SMP PREEMPT Fri Mar 31 17:16:00 UTC 2017 (ea9dcd4) x86_64 x86_64 x86_64 GNU/Linux thomas:~ # mount.cifs --version mount.cifs version: 6.5 thomas:~ # rpm -qf /sbin/mount.cifs cifs-utils-6.5-3.1.x86_64 -- You are receiving this mail because: You are on the CC list for the bug.